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PIC18F87J10 Family Data Sheet
64/80-Pin High-Performance, 1-Mbit Flash Microcontrollers with nanoWatt Technology
2005 Microchip Technology Inc.
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DS39663A
Note the following details of the code protection feature on Microchip devices: * * Microchip products meet the specification contained in their particular Microchip Data Sheet. Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions. There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip's Data Sheets. Most likely, the person doing so is engaged in theft of intellectual property. Microchip is willing to work with the customer who is concerned about the integrity of their code. Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not mean that we are guaranteeing the product as "unbreakable."
*
* *
Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our products. Attempts to break Microchip's code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.
Information contained in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of Microchip's products as critical components in life support systems is not authorized except with express written approval by Microchip. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights.
Trademarks The Microchip name and logo, the Microchip logo, Accuron, dsPIC, KEELOQ, microID, MPLAB, PIC, PICmicro, PICSTART, PRO MATE, PowerSmart, rfPIC, and SmartShunt are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. AmpLab, FilterLab, Migratable Memory, MXDEV, MXLAB, PICMASTER, SEEVAL, SmartSensor and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorporated in the U.S.A. Analog-for-the-Digital Age, Application Maestro, dsPICDEM, dsPICDEM.net, dsPICworks, ECAN, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB, In-Circuit Serial Programming, ICSP, ICEPIC, MPASM, MPLIB, MPLINK, MPSIM, PICkit, PICDEM, PICDEM.net, PICLAB, PICtail, PowerCal, PowerInfo, PowerMate, PowerTool, rfLAB, rfPICDEM, Select Mode, Smart Serial, SmartTel and Total Endurance are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. SQTP is a service mark of Microchip Technology Incorporated in the U.S.A. All other trademarks mentioned herein are property of their respective companies. (c) 2005, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. Printed on recycled paper.
Microchip received ISO/TS-16949:2002 quality system certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona and Mountain View, California in October 2003. The Company's quality system processes and procedures are for its PICmicro(R) 8-bit MCUs, KEELOQ(R) code hopping devices, Serial EEPROMs, microperipherals, nonvolatile memory and analog products. In addition, Microchip's quality system for the design and manufacture of development systems is ISO 9001:2000 certified.
DS39663A-page ii
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2005 Microchip Technology Inc.
PIC18F87J10 FAMILY
64/80-Pin, High-Performance, 1-Mbit Flash Microcontrollers with nanoWatt Technology
Special Microcontroller Features:
* * * * * Operating voltage range: 2.0V to 3.6V 5.5V tolerant input (digital pins only) On-chip 2.5V regulator Low-power, high-speed CMOS Flash technology C compiler optimized architecture: - Optional extended instruction set designed to optimize re-entrant code Priority levels for interrupts 8 x 8 Single-Cycle Hardware Multiplier Extended Watchdog Timer (WDT): - Programmable period from 4 ms to 131s Single-Supply In-Circuit Serial ProgrammingTM (ICSPTM) via two pins In-Circuit Debug (ICD) with three Break points via two pins Power-Managed modes: - Run: CPU on, peripherals on - Idle: CPU off, peripherals on - Sleep: CPU off, peripherals off
Peripheral Highlights:
* High-current sink/source 25 mA/25 mA (PORTB and PORTC) * Four programmable external interrupts * Four input change interrupts * Two Capture/Compare/PWM (CCP) modules * Three Enhanced Capture/Compare/PWM (ECCP) modules: - One, two or four PWM outputs - Selectable polarity - Programmable dead time - Auto-Shutdown and Auto-Restart * Two Master Synchronous Serial Port (MSSP) modules supporting 3-wire SPITM (all 4 modes) and I2CTM Master and Slave modes * Two Enhanced Addressable USART modules: - Supports RS-485, RS-232 and LIN 1.2 - Auto-Wake-up on Start bit - Auto-Baud Detect * 10-bit, up to 15-channel Analog-to-Digital Converter module (A/D): - Auto-acquisition capability - Conversion available during Sleep - Self-calibration feature * Dual analog comparators with input multiplexing
* * * * * *
Flexible Oscillator Structure:
* * * * * * * Two Crystal modes, up to 40 MHz 4x Phase Lock Loop (PLL) Two External Clock modes, up to 40 MHz Internal 31 kHz oscillator Secondary oscillator using Timer1 @ 32 kHz Two-Speed Oscillator Start-up Fail-Safe Clock Monitor: - Allows for safe shutdown if peripheral clock stops
External Memory Bus (PIC18F8XJ10/8XJ15 only):
* Address capability of up to 2 Mbytes * 8-bit or 16-bit interface * 12-bit, 16-bit and 20-bit Addressing modes
2005 Microchip Technology Inc.
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DS39663A-page 1
PIC18F87J10 FAMILY
Comparators EUSART Program Memory Device SRAM Data Flash # Single-Word Memory (bytes) (bytes) Instructions 32K 48K 64K 96K 128K 32K 48K 64K 96K 128K 16384 24576 32768 49152 65536 16384 24576 32768 49152 65536 2048 2048 2048 3936 3936 2048 2048 2048 3936 3936 I/O 10-bit A/D (ch) CCP/ ECCP (PWM) 2/3 2/3 2/3 2/3 2/3 2/3 2/3 2/3 2/3 2/3 2 2 2 2 2 2 2 2 2 2 MSSP SPITM Y Y Y Y Y Y Y Y Y Y Master I2CTM Y Y Y Y Y Y Y Y Y Y External Bus N N N N N Y Y Y Y Y Timers 8/16-bit 2/3 2/3 2/3 2/3 2/3 2/3 2/3 2/3 2/3 2/3
PIC18F65J10 PIC18F65J15 PIC18F66J10 PIC18F66J15 PIC18F67J10 PIC18F85J10 PIC18F85J15 PIC18F86J10 PIC18F86J15 PIC18F87J10
50 50 50 50 50 66 66 66 66 66
11 11 11 11 11 15 15 15 15 15
2 2 2 2 2 2 2 2 2 2
2 2 2 2 2 2 2 2 2 2
Pin Diagrams
64-Pin TQFP
RE2/CS/P2B RE3/P3C RE4/P3B RE5/P1C RE6/P1B RE7/ECCP2(1)/P2A(1) RD0/PSP0 VDD VSS RD1/PSP1 RD2/PSP2 RD3/PSP3 RD4/PSP4/SDO2 RD5/PSP5/SDI2/SDA2 RD6/PSP6/SCK2/SCL2 RD7/PSP7/SS2 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33
RE1/WR/P2C RE0/RD/P2D RG0/ECCP3/P3A RG1/TX2/CK2 RG2/RX2/DT2 RG3/CCP4/P3D MCLR RG4/CCP5/P1D VSS VDDCORE/VCAP RF7/SS1 RF6/AN11 RF5/AN10/CVREF RF4/AN9 RF3/AN8 RF2/AN7/C1OUT
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
PIC18F6XJ10 PIC18F6XJ15
RB0/INT0/FLT0 RB1/INT1 RB2/INT2 RB3/INT3 RB4/KBI0 RB5/KBI1 RB6/KBI2/PGC VSS OSC2/CLKO OSC1/CLKI VDD RB7/KBI3/PGD RC5/SDO1 RC4/SDI1/SDA1 RC3/SCK1/SCL1 RC2/ECCP1/P1A
Note 1: The ECCP2/P2A pin placement depends on the setting of the CCP2MX configuration bit.
RF1/AN6/C2OUT ENVREG AVDD AVSS RA3/AN3/VREF+ RA2/AN2/VREFRA1/AN1 RA0/AN0 VSS VDD RA5/AN4 RA4/T0CKI RC1/T1OSI/ECCP2(1)/P2A(1) RC0/T1OSO/T13CKI RC6/TX1/CK1 RC7/RX1/DT1
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
DS39663A-page 2
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2005 Microchip Technology Inc.
PIC18F87J10 FAMILY
Pin Diagrams (Continued)
RD6/AD6/PSP6/SCK2/SCL2 RE7/AD15/ECCP2(1)/P2A(1) RD5/AD5/PSP5/SDI2/SDA2
80-Pin TQFP
RE2/AD10/CS/P2B RE5/AD13/P1C(2)
RD4/AD4/PSP4/SDO2
RE3/AD11/P3C(2)
RH1/A17
RH0/A16
RD7/AD7/PSP7/SS2 63
RE4/AD12/P3B(2)
RE6/AD14/P1B(2)
RD0/AD0/PSP0
RD1/AD1/PSP1
RD2/AD2/PSP2
RD3/AD3/PSP3
RJ0/ALE 62
80 79
78
77
76
75
74
73
72
71
70
69
68
67
66
65
64
RH2/A18 RH3/A19 RE1/AD9/WR/P2C RE0/AD8/RD/P2D RG0/ECCP3/P3A RG1/TX2/CK2 RG2/RX2/DT2 RG3/CCP4/P3D MCLR RG4/CCP5/P1D VSS VDDCORE/VCAP RF7/SS1 RF6/AN11 RF5/AN10/CVREF RF4/AN9 RF3/AN8 RF2/AN7/C1OUT RH7/AN15/P1B(2) RH6/AN14/P1C(2)
61
RJ1/OE
VDD
VSS
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41
RJ2/WRL RJ3/WRH RB0/INT0/FLT0 RB1/INT1 RB2/INT2 RB3/INT3/ECCP2(1)/P2A(1) RB4/KBI0 RB5/KBI1 RB6/KBI2/PGC VSS OSC2/CLKO OSC1/CLKI VDD RB7/KBI3/PGD RC5/SDO1 RC4/SDI1/SDA1 RC3/SCK1/SCL1 RC2/ECCP1/P1A RJ7/UB RJ6/LB
PIC18F8XJ10 PIC18F8XJ15
RF1/AN6/C2OUT
ENVREG
RA4/T0CKI RC1/T1OSI/ECCP2(1)/P2A(1)
RC0/T1OSO/T13CKI
AVSS RA3/AN3/VREF+
RA2/AN2/VREF-
RA5/AN4
RH5/AN13/P3B(2)
RH4/AN12/P3C(2)
Note 1: The ECCP2/P2A pin placement depends on the setting of the CCP2MX configuration bit and the program memory mode. 2: P1B, P1C, P3B and P3C pin placement depends on the setting of the ECCPMX configuration bit.
2005 Microchip Technology Inc.
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RC7/RX1/DT1
RC6/TX1/CK1
RA1/AN1
RA0/AN0
RJ4/BA0
RJ5/CE
AVDD
VSS
VDD
DS39663A-page 3
PIC18F87J10 FAMILY
Table of Contents
1.0 Device Overview .......................................................................................................................................................................... 5 2.0 Oscillator Configurations ............................................................................................................................................................ 27 3.0 Power-Managed Modes ............................................................................................................................................................. 35 4.0 Reset .......................................................................................................................................................................................... 43 5.0 Memory Organization ................................................................................................................................................................. 55 6.0 Program Memory........................................................................................................................................................................ 81 7.0 External Memory Bus ................................................................................................................................................................. 85 8.0 8 x 8 Hardware Multiplier............................................................................................................................................................ 97 9.0 Interrupts .................................................................................................................................................................................... 99 10.0 I/O Ports ................................................................................................................................................................................... 115 11.0 Timer0 Module ......................................................................................................................................................................... 141 12.0 Timer1 Module ......................................................................................................................................................................... 145 13.0 Timer2 Module ......................................................................................................................................................................... 151 14.0 Timer3 Module ......................................................................................................................................................................... 153 15.0 Timer4 Module ......................................................................................................................................................................... 157 16.0 Capture/Compare/PWM (CCP) Modules ................................................................................................................................. 159 17.0 Enhanced Capture/Compare/PWM (ECCP) Module................................................................................................................ 167 18.0 Master Synchronous Serial Port (MSSP) Module .................................................................................................................... 183 19.0 Enhanced Universal Synchronous Asynchronous Receiver Transmitter (EUSART) ............................................................... 225 20.0 10-Bit Analog-to-Digital Converter (A/D) Module ..................................................................................................................... 247 21.0 Comparator Module.................................................................................................................................................................. 257 22.0 Comparator Voltage Reference Module ................................................................................................................................... 263 23.0 Special Features of the CPU .................................................................................................................................................... 267 24.0 Instruction Set Summary .......................................................................................................................................................... 279 25.0 Development Support............................................................................................................................................................... 329 26.0 Electrical Characteristics .......................................................................................................................................................... 335 27.0 Packaging Information.............................................................................................................................................................. 371 Appendix A: Migration Between High-End Device Families............................................................................................................... 375 Index .................................................................................................................................................................................................. 377 The Microchip Web Site ..................................................................................................................................................................... 389 Customer Change Notification Service .............................................................................................................................................. 389 Customer Support .............................................................................................................................................................................. 389 Reader Response .............................................................................................................................................................................. 390 Product Identification System............................................................................................................................................................. 391
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Most Current Data Sheet
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Errata
An errata sheet, describing minor operational differences from the data sheet and recommended workarounds, may exist for current devices. As device/documentation issues become known to us, we will publish an errata sheet. The errata will specify the revision of silicon and revision of document to which it applies. To determine if an errata sheet exists for a particular device, please check with one of the following: * Microchip's Worldwide Web site; http://www.microchip.com * Your local Microchip sales office (see last page) When contacting a sales office, please specify which device, revision of silicon and data sheet (include literature number) you are using.
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DS39663A-page 4
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2005 Microchip Technology Inc.
PIC18F87J10 FAMILY
1.0 DEVICE OVERVIEW
This document contains device specific information for the following devices: * PIC18F65J10 * PIC18F65J15 * PIC18F66J10 * PIC18F66J15 * PIC18F67J10 * PIC18F85J10 * PIC18F85J15 * PIC18F86J10 * PIC18F86J15 * PIC18F87J10 The internal oscillator block provides a stable reference source that gives the family additional features for robust operation: * Fail-Safe Clock Monitor: This option constantly monitors the main clock source against a reference signal provided by the internal oscillator. If a clock failure occurs, the controller is switched to the internal oscillator, allowing for continued low-speed operation or a safe application shutdown. * Two-Speed Start-up: This option allows the internal oscillator to serve as the clock source from Power-on Reset, or wake-up from Sleep mode, until the primary clock source is available.
This family introduces a new line of low-voltage devices with the main traditional advantage of all PIC18 microcontrollers - namely, high computational performance and a rich feature set - at an extremely competitive price point. These features make the PIC18F87J10 family a logical choice for many high-performance applications where cost is a primarily consideration.
1.1.3
EXPANDED MEMORY
1.1
1.1.1
Core Features
nanoWatt TECHNOLOGY
The PIC18F87J10 family provides ample room for application code, from 32 Kbytes to 128 Kbytes of code space. The Flash cells for program memory are rated to last up to 100 erase/write cycles. Data retention without refresh is conservatively estimated to be greater than 40 years. The PIC18F87J10 family also provides plenty of room for dynamic application data, with up to 3936 bytes of data RAM.
All of the devices in the PIC18F87J10 family incorporate a range of features that can significantly reduce power consumption during operation. Key items include: * Alternate Run Modes: By clocking the controller from the Timer1 source or the internal RC oscillator, power consumption during code execution can be reduced by as much as 90%. * Multiple Idle Modes: The controller can also run with its CPU core disabled but the peripherals still active. In these states, power consumption can be reduced even further, to as little as 4% of normal operation requirements. * On-the-Fly Mode Switching: The power-managed modes are invoked by user code during operation, allowing the user to incorporate power-saving ideas into their application's software design.
1.1.4
EXTERNAL MEMORY BUS
In the unlikely event that 128 Kbytes of memory is inadequate for an application, the 80-pin members of the PIC18F87J10 family also implement an external memory bus. This allows the controller's internal program counter to address a memory space of up to 2 Mbytes, permitting a level of data access that few 8-bit devices can claim. This allows additional memory options, including: * Using combinations of on-chip and external memory up to the 2-Mbyte limit * Using external Flash memory for reprogrammable application code or large data tables * Using external RAM devices for storing large amounts of variable data
1.1.2
OSCILLATOR OPTIONS AND FEATURES
1.1.5
EXTENDED INSTRUCTION SET
All of the devices in the PIC18F87J10 family offer five different oscillator options, allowing users a range of choices in developing application hardware. These include: * Two Crystal modes, using crystals or ceramic resonators. * Two External Clock modes, offering the option of a divide-by-4 clock output. * A Phase Lock Loop (PLL) frequency multiplier, available to the external oscillator modes which allows clock speeds of up to 40 MHz. * An internal RC oscillator with a fixed 31-kHz output which provides an extremely low-power option for timing-insensitive applications.
The PIC18F87J10 family implements the optional extension to the PIC18 instruction set, adding 8 new instructions and an Indexed Addressing mode. Enabled as a device configuration option, the extension has been specifically designed to optimize re-entrant application code originally developed in high-level languages, such as C.
2005 Microchip Technology Inc.
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DS39663A-page 5
PIC18F87J10 FAMILY
1.1.6 EASY MIGRATION
1.3
Regardless of the memory size, all devices share the same rich set of peripherals, allowing for a smooth migration path as applications grow and evolve. The consistent pinout scheme used throughout the entire family also aids in migrating to the next larger device. This is true when moving between the 64-pin members, between the 80-pin members, or even jumping from 64-pin to 80-pin devices. The PIC18F87J10 family is also pin-compatible with other PIC18 families, such as the PIC18F8720 and PIC18F8722. This allows a new dimension to the evolution of applications, allowing developers to select different price points within Microchip's PIC18 portfolio while maintaining the same feature set.
Details on Individual Family Members
Devices in the PIC18F87J10 family are available in 64-pin and 80-pin packages. Block diagrams for the two groups are shown in Figure 1-1 and Figure 1-2. The devices are differentiated from each other in four ways: 1. Flash program memory (six sizes, ranging from 32 Kbytes for PIC18FX5J10 devices to 128 Kbytes for PIC18FXJ710). Data RAM (2048 bytes for PIC18FX5J10/X5J15/X6J10 devices, 3936 bytes for PIC18FX6J15/X7J10 devices). A/D channels (11 for 64-pin devices, 15 for 80-pin devices). I/O ports (7 bidirectional ports on 64-pin devices, 9 bidirectional ports on 80-pin devices).
2.
3. 4.
1.2
Other Special Features
* Communications: The PIC18F87J10 family incorporates a range of serial communication peripherals, including 2 independent Enhanced USARTs and 2 Master SSP modules, capable of both SPITM and I2CTM (Master and Slave) modes of operation. In addition, one of the general purpose I/O ports can be reconfigured as an 8-bit Parallel Slave Port for direct processor-to-processor communications. * CCP Modules: All devices in the family incorporate two Capture/Compare/PWM (CCP) modules and three Enhanced CCP modules to maximize flexibility in control applications. Up to four different time bases may be used to perform several different operations at once. Each of the three ECCPs offers up to four PWM outputs, allowing for a total of 12 PWMs. The ECCPs also offer many beneficial features, including polarity selection, programmable dead time, auto-shutdown and restart and Half-Bridge and Full-Bridge Output modes. * 10-Bit A/D Converter: This module incorporates programmable acquisition time, allowing for a channel to be selected and a conversion to be initiated without waiting for a sampling period and thus, reducing code overhead. * Extended Watchdog Timer (WDT): This enhanced version incorporates a 16-bit prescaler, allowing an extended time-out range that is stable across operating voltage and temperature. See Section 26.0 "Electrical Characteristics" for time-out periods.
All other features for devices in this family are identical. These are summarized in Table 1-1 and Table 1-2. The pinouts for all devices are listed in Table 1-3 and Table 1-4.
DS39663A-page 6
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PIC18F87J10 FAMILY
TABLE 1-1: DEVICE FEATURES FOR THE PIC18F87J10 FAMILY (64-PIN DEVICES)
PIC18F65J10 DC - 40 MHz 32K 16384 2048 PIC18F65J15 DC - 40 MHz 48K 24576 2048 PIC18F66J10 DC - 40 MHz 64K 32768 2048 26 Ports A, B, C, D, E, F, G 5 2 3 MSSP (2), Enhanced USART (2) Yes 11 Input Channels POR, BOR, RESET Instruction, Stack Full, Stack Underflow, MCLR , WDT (PWRT, OST) 75 Instructions, 83 with Extended Instruction Set enabled 64-pin TQFP PIC18F66J15 DC - 40 MHz 96K 49152 3936 PIC18F67J10 DC - 40 MHz 128K 65536 3936 Features Operating Frequency Program Memory (Bytes) Program Memory (Instructions) Data Memory (Bytes) Interrupt Sources I/O Ports Timers Capture/Compare/PWM Modules Enhanced Capture/ Compare/PWM Modules Serial Communications Parallel Communications (PSP) 10-Bit Analog-to-Digital Module Resets (and Delays) Instruction Set Packages
TABLE 1-2:
DEVICE FEATURES FOR THE PIC18F87J10 FAMILY (80-PIN DEVICES)
Features PIC18F85J10 DC - 40 MHz 32K 16384 2048 PIC18F85J15 DC - 40 MHz 48K 24576 2048 PIC18F86J10 DC - 40 MHz 64K 32768 2048 26 Ports A, B, C, D, E, F, G, H, J 5 2 3 MSSP (2), Enhanced USART (2) Yes 15 Input Channels POR, BOR, RESET Instruction, Stack Full, Stack Underflow, MCLR , WDT (PWRT, OST) 75 Instructions, 83 with Extended Instruction Set enabled 80-pin TQFP PIC18F86J15 DC - 40 MHz 96K 49152 3936 PIC18F87J10 DC - 40 MHz 128K 65536 3936
Operating Frequency Program Memory (Bytes) Program Memory (Instructions) Data Memory (Bytes) Interrupt Sources I/O Ports Timers Capture/Compare/PWM Modules Enhanced Capture/ Compare/PWM Modules Serial Communications Parallel Communications (PSP) 10-Bit Analog-to-Digital Module Resets (and Delays) Instruction Set Packages
2005 Microchip Technology Inc.
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DS39663A-page 7
PIC18F87J10 FAMILY
FIGURE 1-1: PIC18F6XJ10/6XJ15 (64-PIN) BLOCK DIAGRAM
Table Pointer<21> inc/dec logic 21 20 PCU PCH PCL Program Counter 8
PCLATU PCLATH
Data Bus<8> Data Latch Data Memory (3.9 Kbytes) Address Latch 12 Data Address<12> 4 BSR 12 FSR0 FSR1 FSR2 inc/dec logic 4 Access Bank 12 PORTC RC0:RC7(1) PORTB RB0:RB7(1) PORTA RA0:RA5(1)
8
31 Level Stack Address Latch Program Memory (96 Kbytes) Data Latch 8
Table Latch
STKPTR
ROM Latch
Instruction Bus <16> IR
Address Decode PORTD RD0:RD7(1) 8
Instruction Decode and Control
State Machine Control Signals PRODH PRODL 3 BITOP 8 8 ALU<8> 8 8 x 8 Multiply 8 W 8 8 PORTF RF1:RF7(1) PORTE RE0:RE7(1)
OSC2/CLKO OSC1/CLKI
Timing Generation
Power-up Timer Oscillator Start-up Timer Power-on Reset Watchdog Timer Brown-out Reset(2)
INTRC Oscillator Precision Band Gap Reference ENVREG Voltage Regulator
8
PORTG RG0:RG4(1)
VDDCORE/VCAP
VDD, VSS
MCLR
ADC 10-bit
Timer0
Timer1
Timer2
Timer3
Timer4
Comparators
ECCP1
ECCP2
ECCP3
CCP4
CCP5
EUSART1
EUSART2
MSSP1
MSSP2
Note
1: 2:
See Table 1-3 for I/O port pin descriptions. BOR functionality is provided when the on-board voltage regulator is enabled.
DS39663A-page 8
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2005 Microchip Technology Inc.
PIC18F87J10 FAMILY
FIGURE 1-2: PIC18F8XJ10/8XJ15 (80-PIN) BLOCK DIAGRAM
Data Bus<8> Data Latch Data Memory (3.9 Kbytes) Address Latch PCU PCH PCL Program Counter 12 Data Address<12> 4 STKPTR
BSR
PORTA RA0:RA5(1)
Table Pointer<21> inc/dec logic 21 20
8
PCLATU PCLATH
8
PORTB RB0:RB7(1)
31 Level Stack System Bus Interface Address Latch Program Memory (128 Kbytes) Data Latch 8
Table Latch
12 FSR0 FSR1 FSR2 inc/dec logic
4
Access Bank
PORTC RC0:RC7(1)
12
PORTD RD0:RD7(1)
ROM Latch
Instruction Bus <16>
IR
Address Decode PORTE
AD15:AD0, A19:A16 (Multiplexed with PORTD, PORTE and PORTH)
RE0:RE7(1) 8
State Machine Control Signals
Instruction Decode & Control
PRODH PRODL 3 BITOP 8 8 ALU<8> 8 8 x 8 Multiply 8 W 8 8
PORTF RF1:RF7(1)
OSC2/CLKO OSC1/CLKI
Timing Generation
Power-up Timer Oscillator Start-up Timer Power-on Reset Watchdog Timer Brown-out Reset(2)
PORTG RG0:RG4(1)
8 PORTH RH0:RH7(1)
INTRC Oscillator Precision Band Gap Reference ENVREG Voltage Regulator
PORTJ RJ0:RJ7(1)
VDDCORE/VCAP
VDD, VSS
MCLR
ADC 10-bit
Timer0
Timer1
Timer2
Timer3
Timer4
Comparators
ECCP1
ECCP2
ECCP3
CCP4
CCP5
EUSART1
EUSART2
MSSP1
MSSP2
Note
1: 2:
See Table 1-4 for I/O port pin descriptions. BOR functionality is provided when the on-board voltage regulator is enabled.
2005 Microchip Technology Inc.
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DS39663A-page 9
PIC18F87J10 FAMILY
TABLE 1-3:
Pin Name TQFP MCLR OSC1/CLKI OSC1 7 39 I
PIC18F6XJ10/6XJ15 PINOUT I/O DESCRIPTIONS
Pin Number Pin Type I Buffer Type ST Description Master Clear (Reset) input. This pin is an active-low Reset to the device.
CLKI
I
Oscillator crystal or external clock input. Oscillator crystal input or external clock source input. ST buffer when configured in RC mode; CMOS otherwise. CMOS External clock source input. Always associated with pin function OSC1. (See related OSC1/CLKI, OSC2/CLKO pins.) ST -- -- Oscillator crystal or clock output. Oscillator crystal output. Connects to crystal or resonator in Crystal Oscillator mode. In RC mode, OSC2 pin outputs CLKO which has 1/4 the frequency of OSC1 and denotes the instruction cycle rate. PORTA is a bidirectional I/O port.
OSC2/CLKO OSC2 CLKO
40 O O
RA0/AN0 RA0 AN0 RA1/AN1 RA1 AN1 RA2/AN2/VREFRA2 AN2 VREFRA3/AN3/VREF+ RA3 AN3 VREF+ RA4/T0CKI RA4 T0CKI RA5/AN4 RA5 AN4
24 I/O I 23 I/O I 22 I/O I I 21 I/O I I 28 I/O I 27 I/O I TTL Analog Digital I/O. Analog input 4. ST ST Digital I/O. Timer0 external clock input. TTL Analog Analog Digital I/O. Analog input 3. A/D reference voltage (high) input. TTL Analog Analog Digital I/O. Analog input 2. A/D reference voltage (low) input. TTL Analog Digital I/O. Analog input 1. TTL Analog Digital I/O. Analog input 0.
Legend: TTL = TTL compatible input CMOS = CMOS compatible input or output ST = Schmitt Trigger input with CMOS levels Analog = Analog input I = Input O = Output P = Power OD = Open-Drain (no P diode to VDD) Note 1: Default assignment for ECCP2/P2A when configuration bit CCP2MX is set. 2: Alternate assignment for ECCP2/P2A when configuration bit CCP2MX is cleared.
DS39663A-page 10
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2005 Microchip Technology Inc.
PIC18F87J10 FAMILY
TABLE 1-3:
Pin Name TQFP
PIC18F6XJ10/6XJ15 PINOUT I/O DESCRIPTIONS (CONTINUED)
Pin Number Pin Type Buffer Type Description PORTB is a bidirectional I/O port. PORTB can be software programmed for internal weak pull-ups on all inputs.
RB0/INT0/FLT0 RB0 INT0 FLT0 RB1/INT1 RB1 INT1 RB2/INT2 RB2 INT2 RB3/INT3 RB3 INT3 RB4/KBI0 RB4 KBI0 RB5/KBI1 RB5 KBI1 RB6/KBI2/PGC RB6 KBI2 PGC RB7/KBI3/PGD RB7 KBI3 PGD
48 I/O I I 47 I/O I 46 I/O I 45 I/O I 44 I/O I 43 I/O I 42 I/O I I/O 37 I/O I I/O TTL TTL ST Digital I/O. Interrupt-on-change pin. In-Circuit Debugger and ICSP programming data pin. TTL TTL ST Digital I/O. Interrupt-on-change pin. In-Circuit Debugger and ICSPTM programming clock pin. TTL TTL Digital I/O. Interrupt-on-change pin. TTL TTL Digital I/O. Interrupt-on-change pin. TTL ST Digital I/O. External interrupt 3. TTL ST Digital I/O. External interrupt 2. TTL ST Digital I/O. External interrupt 1. TTL ST ST Digital I/O. External interrupt 0. ECCP1/2/3 Fault input.
Legend: TTL = TTL compatible input CMOS = CMOS compatible input or output ST = Schmitt Trigger input with CMOS levels Analog = Analog input I = Input O = Output P = Power OD = Open-Drain (no P diode to VDD) Note 1: Default assignment for ECCP2/P2A when configuration bit CCP2MX is set. 2: Alternate assignment for ECCP2/P2A when configuration bit CCP2MX is cleared.
2005 Microchip Technology Inc.
Advance Information
DS39663A-page 11
PIC18F87J10 FAMILY
TABLE 1-3:
Pin Name TQFP
PIC18F6XJ10/6XJ15 PINOUT I/O DESCRIPTIONS (CONTINUED)
Pin Number Pin Type Buffer Type Description PORTC is a bidirectional I/O port.
RC0/T1OSO/T13CKI RC0 T1OSO T13CKI RC1/T1OSI/ECCP2/P2A RC1 T1OSI ECCP2(1) P2A(1) RC2/ECCP1/P1A RC2 ECCP1 P1A RC3/SCK1/SCL1 RC3 SCK1 SCL1 RC4/SDI1/SDA1 RC4 SDI1 SDA1 RC5/SDO1 RC5 SDO1 RC6/TX1/CK1 RC6 TX1 CK1 RC7/RX1/DT1 RC7 RX1 DT1
30 I/O O I 29 I/O I I/O O 33 I/O I/O O 34 I/O I/O I/O 35 I/O I I/O 36 I/O O 31 I/O O I/O 32 I/O I I/O ST ST ST Digital I/O. EUSART1 asynchronous receive. EUSART1 synchronous data (see related TX1/CK1). ST -- ST Digital I/O. EUSART1 asynchronous transmit. EUSART1 synchronous clock (see related RX1/DT1). ST -- Digital I/O. SPI data out. ST ST ST Digital I/O. SPI data in. I2C data I/O. ST ST ST Digital I/O. Synchronous serial clock input/output for SPITM mode. Synchronous serial clock input/output for I2CTM mode. ST ST -- Digital I/O. Capture 1 input/Compare 1 output/PWM 1 output. ECCP1 PWM output A. ST CMOS ST -- Digital I/O. Timer1 oscillator input. Capture 2 input/Compare 2 output/PWM 2 output. ECCP2 PWM output A. ST -- ST Digital I/O. Timer1 oscillator output. Timer1/Timer3 external clock input.
Legend: TTL = TTL compatible input CMOS = CMOS compatible input or output ST = Schmitt Trigger input with CMOS levels Analog = Analog input I = Input O = Output P = Power OD = Open-Drain (no P diode to VDD) Note 1: Default assignment for ECCP2/P2A when configuration bit CCP2MX is set. 2: Alternate assignment for ECCP2/P2A when configuration bit CCP2MX is cleared.
DS39663A-page 12
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2005 Microchip Technology Inc.
PIC18F87J10 FAMILY
TABLE 1-3:
Pin Name TQFP
PIC18F6XJ10/6XJ15 PINOUT I/O DESCRIPTIONS (CONTINUED)
Pin Number Pin Type Buffer Type Description PORTD is a bidirectional I/O port.
RD0/PSP0 RD0 PSP0 RD1/PSP1 RD1 PSP1 RD2/PSP2 RD2 PSP2 RD3/PSP3 RD3 PSP3 RD4/PSP4/SDO2 RD4 PSP4 SDO2 RD5/PSP5/SDI2/SDA2 RD5 PSP5 SDI2 SDA2 RD6/PSP6/SCK2/SCL2 RD6 PSP6 SCK2 SCL2 RD7/PSP7/SS2 RD7 PSP7 SS2
58 I/O I/O 55 I/O I/O 54 I/O I/O 53 I/O I/O 52 I/O I/O O 51 I/O I/O I I/O 50 I/O I/O I/O I/O 49 I/O I/O I ST TTL TTL Digital I/O. Parallel Slave Port data. SPI slave select input. ST TTL ST ST Digital I/O. Parallel Slave Port data. Synchronous serial clock input/output for SPI mode. Synchronous serial clock input/output for I2C mode. ST TTL ST ST Digital I/O. Parallel Slave Port data. SPI data in. I2CTM data I/O. ST TTL -- Digital I/O. Parallel Slave Port data. SPITM data out. ST TTL Digital I/O. Parallel Slave Port data. ST TTL Digital I/O. Parallel Slave Port data. ST TTL Digital I/O. Parallel Slave Port data. ST TTL Digital I/O. Parallel Slave Port data.
Legend: TTL = TTL compatible input CMOS = CMOS compatible input or output ST = Schmitt Trigger input with CMOS levels Analog = Analog input I = Input O = Output P = Power OD = Open-Drain (no P diode to VDD) Note 1: Default assignment for ECCP2/P2A when configuration bit CCP2MX is set. 2: Alternate assignment for ECCP2/P2A when configuration bit CCP2MX is cleared.
2005 Microchip Technology Inc.
Advance Information
DS39663A-page 13
PIC18F87J10 FAMILY
TABLE 1-3:
Pin Name TQFP
PIC18F6XJ10/6XJ15 PINOUT I/O DESCRIPTIONS (CONTINUED)
Pin Number Pin Type Buffer Type Description PORTE is a bidirectional I/O port.
RE0/RD/P2D RE0 RD P2D RE1/WR/P2C RE1 WR P2C RE2/CS/P2B RE2 CS P2B RE3/P3C RE3 P3C RE4/P3B RE4 P3B RE5/P1C RE5 P1C RE6/P1B RE6 P1B RE7/ECCP2/P2A RE7 ECCP2(2) P2A(2)
2 I/O I O 1 I/O I O 64 I/O I O 63 I/O O 62 I/O O 61 I/O O 60 I/O O 59 I/O I/O O ST ST -- Digital I/O. Capture 2 input/Compare 2 output/PWM 2 output. ECCP2 PWM output A. ST -- Digital I/O. ECCP1 PWM output B. ST -- Digital I/O. ECCP1 PWM output C. ST -- Digital I/O. ECCP3 PWM output B. ST -- Digital I/O. ECCP3 PWM output C. ST TTL -- Digital I/O. Chip select control for Parallel Slave Port. ECCP2 PWM output B. ST TTL -- Digital I/O. Write control for Parallel Slave Port. ECCP2 PWM output C. ST TTL -- Digital I/O. Read control for Parallel Slave Port. ECCP2 PWM output D.
Legend: TTL = TTL compatible input CMOS = CMOS compatible input or output ST = Schmitt Trigger input with CMOS levels Analog = Analog input I = Input O = Output P = Power OD = Open-Drain (no P diode to VDD) Note 1: Default assignment for ECCP2/P2A when configuration bit CCP2MX is set. 2: Alternate assignment for ECCP2/P2A when configuration bit CCP2MX is cleared.
DS39663A-page 14
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2005 Microchip Technology Inc.
PIC18F87J10 FAMILY
TABLE 1-3:
Pin Name TQFP
PIC18F6XJ10/6XJ15 PINOUT I/O DESCRIPTIONS (CONTINUED)
Pin Number Pin Type Buffer Type Description PORTF is a bidirectional I/O port.
RF1/AN6/C2OUT RF1 AN6 C2OUT RF2/AN7/C1OUT RF2 AN7 C1OUT RF3/AN8 RF3 AN8 RF4/AN9 RF4 AN9 RF5/AN10/CVREF RF5 AN10 CVREF RF6/AN11 RF6 AN11 RF7/SS1 RF7 SS1
17 I/O I O 16 I/O I O 15 I/O I 14 I/O I 13 I/O I O 12 I/O I 11 I/O I ST TTL Digital I/O. SPITM slave select input. ST Analog Digital I/O. Analog input 11. ST Analog -- Digital I/O. Analog input 10. Comparator reference voltage output. ST Analog Digital I/O. Analog input 9. ST Analog Digital I/O. Analog input 8. ST Analog -- Digital I/O. Analog input 7. Comparator 1 output. ST Analog -- Digital I/O. Analog input 6. Comparator 2 output.
Legend: TTL = TTL compatible input CMOS = CMOS compatible input or output ST = Schmitt Trigger input with CMOS levels Analog = Analog input I = Input O = Output P = Power OD = Open-Drain (no P diode to VDD) Note 1: Default assignment for ECCP2/P2A when configuration bit CCP2MX is set. 2: Alternate assignment for ECCP2/P2A when configuration bit CCP2MX is cleared.
2005 Microchip Technology Inc.
Advance Information
DS39663A-page 15
PIC18F87J10 FAMILY
TABLE 1-3:
Pin Name TQFP
PIC18F6XJ10/6XJ15 PINOUT I/O DESCRIPTIONS (CONTINUED)
Pin Number Pin Type Buffer Type Description PORTG is a bidirectional I/O port.
RG0/ECCP3/P3A RG0 ECCP3 P3A RG1/TX2/CK2 RG1 TX2 CK2 RG2/RX2/DT2 RG2 RX2 DT2 RG3/CCP4/P3D RG3 CCP4 P3D RG4/CCP5/P1D RG4 CCP5 P1D VSS VDD AVSS AVDD ENVREG VDDCORE/VCAP VDDCORE VCAP
3 I/O I/O O 4 I/O O I/O 5 I/O I I/O 6 I/O I/O O 8 I/O I/O O 9, 25, 41, 56 26, 38, 57 20 19 18 10 P P -- -- P P P P I ST ST -- -- -- -- -- ST Digital I/O. Capture 5 input/Compare 5 output/PWM 5 output. ECCP1 PWM output D. Ground reference for logic and I/O pins. Positive supply for peripheral digital logic and I/O pins. Ground reference for analog modules. Positive supply for analog modules. Enable for on-chip voltage regulator. Core logic power or external filter capacitor connection. Positive supply for microcontroller core logic (regulator disabled). External filter capacitor connection (regulator enabled). ST ST -- Digital I/O. Capture 4 input/Compare 4 output/PWM 4 output. ECCP3 PWM output D. ST ST ST Digital I/O. EUSART2 asynchronous receive. EUSART2 synchronous data (see related TX2/CK2). ST -- ST Digital I/O. EUSART2 asynchronous transmit. EUSART2 synchronous clock (see related RX2/DT2). ST ST -- Digital I/O. Capture 3 input/Compare 3 output/PWM 3 output. ECCP3 PWM output A.
Legend: TTL = TTL compatible input CMOS = CMOS compatible input or output ST = Schmitt Trigger input with CMOS levels Analog = Analog input I = Input O = Output P = Power OD = Open-Drain (no P diode to VDD) Note 1: Default assignment for ECCP2/P2A when configuration bit CCP2MX is set. 2: Alternate assignment for ECCP2/P2A when configuration bit CCP2MX is cleared.
DS39663A-page 16
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2005 Microchip Technology Inc.
PIC18F87J10 FAMILY
TABLE 1-4:
Pin Name TQFP MCLR OSC1/CLKI OSC1 9 49 I
PIC18F8XJ10/8XJ15 PINOUT I/O DESCRIPTIONS
Pin Number Pin Type I Buffer Type ST Description Master Clear (Reset) input. This pin is an active-low Reset to the device.
CLKI
I
Oscillator crystal or external clock input. Oscillator crystal input or external clock source input. ST buffer when configured in RC mode; CMOS otherwise. CMOS External clock source input. Always associated with pin function OSC1. (See related OSC1/CLKI, OSC2/CLKO pins.) ST -- -- Oscillator crystal or clock output. Oscillator crystal output. Connects to crystal or resonator in Crystal Oscillator mode. In RC mode, OSC2 pin outputs CLKO which has 1/4 the frequency of OSC1 and denotes the instruction cycle rate. PORTA is a bidirectional I/O port.
OSC2/CLKO OSC2 CLKO
50 O O
RA0/AN0 RA0 AN0 RA1/AN1 RA1 AN1 RA2/AN2/VREFRA2 AN2 VREFRA3/AN3/VREF+ RA3 AN3 VREF+ RA4/T0CKI RA4 T0CKI RA5/AN4 RA5 AN4 Legend:
30 I/O I 29 I/O I 28 I/O I I 27 I/O I I 34 I/O I 33 I/O I TTL Analog Digital I/O. Analog input 4. ST ST Digital I/O. Timer0 external clock input. TTL Analog Analog Digital I/O. Analog input 3. A/D reference voltage (high) input. TTL Analog Analog Digital I/O. Analog input 2. A/D reference voltage (low) input. TTL Analog Digital I/O. Analog input 1. TTL Analog Digital I/O. Analog input 0.
Note 1: 2: 3: 4: 5:
TTL = TTL compatible input CMOS = CMOS compatible input or output ST = Schmitt Trigger input with CMOS levels Analog = Analog input I = Input O = Output P = Power OD = Open-Drain (no P diode to VDD) Alternate assignment for ECCP2/P2A when configuration bit CCP2MX is cleared (Extended Microcontroller mode). Default assignment for ECCP2/P2A for all devices in all operating modes (CCP2MX is set). Default assignments for P1B/P1C/P3B/P3C (ECCPMX configuration bit is set). Alternate assignment for ECCP2/P2A when CCP2MX is cleared (Microcontroller mode). Alternate assignments for P1B/P1C/P3B/P3C (ECCPMX configuration bit is cleared).
2005 Microchip Technology Inc.
Advance Information
DS39663A-page 17
PIC18F87J10 FAMILY
TABLE 1-4:
Pin Name TQFP
PIC18F8XJ10/8XJ15 PINOUT I/O DESCRIPTIONS (CONTINUED)
Pin Number Pin Type Buffer Type Description PORTB is a bidirectional I/O port. PORTB can be software programmed for internal weak pull-ups on all inputs.
RB0/INT0/FLT0 RB0 INT0 FLT0 RB1/INT1 RB1 INT1 RB2/INT2 RB2 INT2 RB3/INT3/ECCP2/P2A RB3 INT3 ECCP2(1) P2A(1) RB4/KBI0 RB4 KBI0 RB5/KBI1 RB5 KBI1 RB6/KBI2/PGC RB6 KBI2 PGC RB7/KBI3/PGD RB7 KBI3 PGD Legend:
58 I/O I I 57 I/O I 56 I/O I 55 I/O I I/O O 54 I/O I 53 I/O I 52 I/O I I/O 47 I/O I I/O TTL TTL ST Digital I/O. Interrupt-on-change pin. In-Circuit Debugger and ICSP programming data pin. TTL TTL ST Digital I/O. Interrupt-on-change pin. In-Circuit Debugger and ICSPTM programming clock pin. TTL TTL Digital I/O. Interrupt-on-change pin. TTL TTL Digital I/O. Interrupt-on-change pin. TTL ST ST -- Digital I/O. External interrupt 3. Capture 2 input/Compare 2 output/PWM 2 output. ECCP2 PWM output A. TTL ST Digital I/O. External interrupt 2. TTL ST Digital I/O. External interrupt 1. TTL ST ST Digital I/O. External interrupt 0. ECCP1/2/3 Fault input.
Note 1: 2: 3: 4: 5:
TTL = TTL compatible input CMOS = CMOS compatible input or output ST = Schmitt Trigger input with CMOS levels Analog = Analog input I = Input O = Output P = Power OD = Open-Drain (no P diode to VDD) Alternate assignment for ECCP2/P2A when configuration bit CCP2MX is cleared (Extended Microcontroller mode). Default assignment for ECCP2/P2A for all devices in all operating modes (CCP2MX is set). Default assignments for P1B/P1C/P3B/P3C (ECCPMX configuration bit is set). Alternate assignment for ECCP2/P2A when CCP2MX is cleared (Microcontroller mode). Alternate assignments for P1B/P1C/P3B/P3C (ECCPMX configuration bit is cleared).
DS39663A-page 18
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2005 Microchip Technology Inc.
PIC18F87J10 FAMILY
TABLE 1-4:
Pin Name TQFP
PIC18F8XJ10/8XJ15 PINOUT I/O DESCRIPTIONS (CONTINUED)
Pin Number Pin Type Buffer Type Description PORTC is a bidirectional I/O port.
RC0/T1OSO/T13CKI RC0 T1OSO T13CKI RC1/T1OSI/ECCP2/P2A RC1 T1OSI ECCP2(2) P2A(2) RC2/ECCP1/P1A RC2 ECCP1 P1A RC3/SCK1/SCL1 RC3 SCK1 SCL1 RC4/SDI1/SDA1 RC4 SDI1 SDA1 RC5/SDO1 RC5 SDO1 RC6/TX1/CK1 RC6 TX1 CK1 RC7/RX1/DT1 RC7 RX1 DT1 Legend:
36 I/O O I 35 I/O I I/O O 43 I/O I/O O 44 I/O I/O I/O 45 I/O I I/O 46 I/O O 37 I/O O I/O 38 I/O I I/O ST ST ST Digital I/O. EUSART1 asynchronous receive. EUSART1 synchronous data (see related TX1/CK1). ST -- ST Digital I/O. EUSART1 asynchronous transmit. EUSART1 synchronous clock (see related RX1/DT1). ST -- Digital I/O. SPI data out. ST ST ST Digital I/O. SPI data in. I2C data I/O. ST ST ST Digital I/O. Synchronous serial clock input/output for SPITM mode. Synchronous serial clock input/output for I2CTM mode. ST ST -- Digital I/O. Capture 1 input/Compare 1 output/PWM 1 output. ECCP1 PWM output A. ST CMOS ST -- Digital I/O. Timer1 oscillator input. Capture 2 input/Compare 2 output/PWM 2 output. ECCP2 PWM output A. ST -- ST Digital I/O. Timer1 oscillator output. Timer1/Timer3 external clock input.
Note 1: 2: 3: 4: 5:
TTL = TTL compatible input CMOS = CMOS compatible input or output ST = Schmitt Trigger input with CMOS levels Analog = Analog input I = Input O = Output P = Power OD = Open-Drain (no P diode to VDD) Alternate assignment for ECCP2/P2A when configuration bit CCP2MX is cleared (Extended Microcontroller mode). Default assignment for ECCP2/P2A for all devices in all operating modes (CCP2MX is set). Default assignments for P1B/P1C/P3B/P3C (ECCPMX configuration bit is set). Alternate assignment for ECCP2/P2A when CCP2MX is cleared (Microcontroller mode). Alternate assignments for P1B/P1C/P3B/P3C (ECCPMX configuration bit is cleared).
2005 Microchip Technology Inc.
Advance Information
DS39663A-page 19
PIC18F87J10 FAMILY
TABLE 1-4:
Pin Name TQFP
PIC18F8XJ10/8XJ15 PINOUT I/O DESCRIPTIONS (CONTINUED)
Pin Number Pin Type Buffer Type Description PORTD is a bidirectional I/O port.
RD0/AD0/PSP0 RD0 AD0 PSP0 RD1/AD1/PSP1 RD1 AD1 PSP1 RD2/AD2/PSP2 RD2 AD2 PSP2 RD3/AD3/PSP3 RD3 AD3 PSP3 RD4/AD4/PSP4/SDO2 RD4 AD4 PSP4 SDO2 RD5/AD5/PSP5/ SDI2/SDA2 RD5 AD5 PSP5 SDI2 SDA2 RD6/AD6/PSP6/ SCK2/SCL2 RD6 AD6 PSP6 SCK2 SCL2 RD7/AD7/PSP7/SS2 RD7 AD7 PSP7 SS2 Legend:
72 I/O I/O I/O 69 I/O I/O I/O 68 I/O I/O I/O 67 I/O I/O I/O 66 I/O I/O I/O O 65 I/O I/O I/O I I/O 64 I/O I/O I/O I/O I/O 63 I/O I/O I/O I ST TTL TTL TTL Digital I/O. External memory address/data 7. Parallel Slave Port data. SPI slave select input. ST TTL TTL ST ST Digital I/O. External memory address/data 6. Parallel Slave Port data. Synchronous serial clock input/output for SPI mode. Synchronous serial clock input/output for I2C mode. ST TTL TTL ST ST Digital I/O. External memory address/data 5. Parallel Slave Port data. SPI data in. I2CTM data I/O. ST TTL TTL -- Digital I/O. External memory address/data 4. Parallel Slave Port data. SPITM data out. ST TTL TTL Digital I/O. External memory address/data 3. Parallel Slave Port data. ST TTL TTL Digital I/O. External memory address/data 2. Parallel Slave Port data. ST TTL TTL Digital I/O. External memory address/data 1. Parallel Slave Port data. ST TTL TTL Digital I/O. External memory address/data 0. Parallel Slave Port data.
Note 1: 2: 3: 4: 5:
TTL = TTL compatible input CMOS = CMOS compatible input or output ST = Schmitt Trigger input with CMOS levels Analog = Analog input I = Input O = Output P = Power OD = Open-Drain (no P diode to VDD) Alternate assignment for ECCP2/P2A when configuration bit CCP2MX is cleared (Extended Microcontroller mode). Default assignment for ECCP2/P2A for all devices in all operating modes (CCP2MX is set). Default assignments for P1B/P1C/P3B/P3C (ECCPMX configuration bit is set). Alternate assignment for ECCP2/P2A when CCP2MX is cleared (Microcontroller mode). Alternate assignments for P1B/P1C/P3B/P3C (ECCPMX configuration bit is cleared).
DS39663A-page 20
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2005 Microchip Technology Inc.
PIC18F87J10 FAMILY
TABLE 1-4:
Pin Name TQFP
PIC18F8XJ10/8XJ15 PINOUT I/O DESCRIPTIONS (CONTINUED)
Pin Number Pin Type Buffer Type Description PORTE is a bidirectional I/O port.
RE0/AD8/RD/P2D RE0 AD8 RD P2D RE1/AD9/WR/P2C RE1 AD9 WR P2C RE2/AD10/CS/P2B RE2 AD10 CS P2B RE3/AD11/P3C RE3 AD11 P3C(3) RE4/AD12/P3B RE4 AD12 P3B(3) RE5/AD13/P1C RE5 AD13 P1C(3) RE6/AD14/P1B RE6 AD14 P1B(3) RE7/AD15/ECCP2/P2A RE7 AD15 ECCP2(4) P2A(4) Legend:
4 I/O I/O I O 3 I/O I/O I O 78 I/O I/O I O 77 I/O I/O O 76 I/O I/O O 75 I/O I/O O 74 I/O I/O O 73 I/O I/O I/O O ST TTL ST -- Digital I/O. External memory address/data 15. Capture 2 input/Compare 2 output/PWM 2 output. ECCP2 PWM output A. ST TTL -- Digital I/O. External memory address/data 14. ECCP1 PWM output B. ST TTL -- Digital I/O. External memory address/data 13. ECCP1 PWM output C. ST TTL -- Digital I/O. External memory address/data 12. ECCP3 PWM output B. ST TTL -- Digital I/O. External memory address/data 11. ECCP3 PWM output C. ST TTL TTL -- Digital I/O. External memory address/data 10. Chip select control for Parallel Slave Port. ECCP2 PWM output B. ST TTL TTL -- Digital I/O. External memory address/data 9. Write control for Parallel Slave Port. ECCP2 PWM output C. ST TTL TTL -- Digital I/O. External memory address/data 8. Read control for Parallel Slave Port. ECCP2 PWM output D.
Note 1: 2: 3: 4: 5:
TTL = TTL compatible input CMOS = CMOS compatible input or output ST = Schmitt Trigger input with CMOS levels Analog = Analog input I = Input O = Output P = Power OD = Open-Drain (no P diode to VDD) Alternate assignment for ECCP2/P2A when configuration bit CCP2MX is cleared (Extended Microcontroller mode). Default assignment for ECCP2/P2A for all devices in all operating modes (CCP2MX is set). Default assignments for P1B/P1C/P3B/P3C (ECCPMX configuration bit is set). Alternate assignment for ECCP2/P2A when CCP2MX is cleared (Microcontroller mode). Alternate assignments for P1B/P1C/P3B/P3C (ECCPMX configuration bit is cleared).
2005 Microchip Technology Inc.
Advance Information
DS39663A-page 21
PIC18F87J10 FAMILY
TABLE 1-4:
Pin Name TQFP
PIC18F8XJ10/8XJ15 PINOUT I/O DESCRIPTIONS (CONTINUED)
Pin Number Pin Type Buffer Type Description PORTF is a bidirectional I/O port.
RF1/AN6/C2OUT RF1 AN6 C2OUT RF2/AN7/C1OUT RF2 AN7 C1OUT RF3/AN8 RF3 AN8 RF4/AN9 RF4 AN9 RF5/AN10/CVREF RF5 AN10 CVREF RF6/AN11 RF6 AN11 RF7/SS1 RF7 SS1 Legend:
23 I/O I O 18 I/O I O 17 I/O I 16 I/O I 15 I/O I O 14 I/O I 13 I/O I ST TTL Digital I/O. SPITM slave select input. ST Analog Digital I/O. Analog input 11. ST Analog -- Digital I/O. Analog input 10. Comparator reference voltage output. ST Analog Digital I/O. Analog input 9. ST Analog Digital I/O. Analog input 8. ST Analog -- Digital I/O. Analog input 7. Comparator 1 output. ST Analog -- Digital I/O. Analog input 6. Comparator 2 output.
Note 1: 2: 3: 4: 5:
TTL = TTL compatible input CMOS = CMOS compatible input or output ST = Schmitt Trigger input with CMOS levels Analog = Analog input I = Input O = Output P = Power OD = Open-Drain (no P diode to VDD) Alternate assignment for ECCP2/P2A when configuration bit CCP2MX is cleared (Extended Microcontroller mode). Default assignment for ECCP2/P2A for all devices in all operating modes (CCP2MX is set). Default assignments for P1B/P1C/P3B/P3C (ECCPMX configuration bit is set). Alternate assignment for ECCP2/P2A when CCP2MX is cleared (Microcontroller mode). Alternate assignments for P1B/P1C/P3B/P3C (ECCPMX configuration bit is cleared).
DS39663A-page 22
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2005 Microchip Technology Inc.
PIC18F87J10 FAMILY
TABLE 1-4:
Pin Name TQFP
PIC18F8XJ10/8XJ15 PINOUT I/O DESCRIPTIONS (CONTINUED)
Pin Number Pin Type Buffer Type Description PORTG is a bidirectional I/O port.
RG0/ECCP3/P3A RG0 ECCP3 P3A RG1/TX2/CK2 RG1 TX2 CK2 RG2/RX2/DT2 RG2 RX2 DT2 RG3/CCP4/P3D RG3 CCP4 P3D RG4/CCP5/P1D RG4 CCP5 P1D Legend:
5 I/O I/O O 6 I/O O I/O 7 I/O I I/O 8 I/O I/O O 10 I/O I/O O ST ST TTL Digital I/O. Capture 5 input/Compare 5 output/PWM 5 output. ECCP1 PWM output D. ST ST TTL Digital I/O. Capture 4 input/Compare 4 output/PWM 4 output. ECCP3 PWM output D. ST ST ST Digital I/O. EUSART2 asynchronous receive. EUSART2 synchronous data (see related TX2/CK2). ST -- ST Digital I/O. EUSART2 asynchronous transmit. EUSART2 synchronous clock (see related RX2/DT2). ST ST TTL Digital I/O. Capture 3 input/Compare 3 output/PWM 3 output. ECCP3 PWM output A.
Note 1: 2: 3: 4: 5:
TTL = TTL compatible input CMOS = CMOS compatible input or output ST = Schmitt Trigger input with CMOS levels Analog = Analog input I = Input O = Output P = Power OD = Open-Drain (no P diode to VDD) Alternate assignment for ECCP2/P2A when configuration bit CCP2MX is cleared (Extended Microcontroller mode). Default assignment for ECCP2/P2A for all devices in all operating modes (CCP2MX is set). Default assignments for P1B/P1C/P3B/P3C (ECCPMX configuration bit is set). Alternate assignment for ECCP2/P2A when CCP2MX is cleared (Microcontroller mode). Alternate assignments for P1B/P1C/P3B/P3C (ECCPMX configuration bit is cleared).
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TABLE 1-4:
Pin Name TQFP
PIC18F8XJ10/8XJ15 PINOUT I/O DESCRIPTIONS (CONTINUED)
Pin Number Pin Type Buffer Type Description PORTH is a bidirectional I/O port.
RH0/A16 RH0 A16 RH1/A17 RH1 A17 RH2/A18 RH2 A18 RH3/A19 RH3 A19 RH4/AN12/P3C RH4 AN12 P3C(5) RH5/AN13/P3B RH5 AN13 P3B(5) RH6/AN14/P1C RH6 AN14 P1C(5) RH7/AN15/P1B RH7 AN15 P1B(5) Legend:
79 I/O I/O 80 I/O I/O 1 I/O I/O 2 I/O I/O 22 I/O I O 21 I/O I O 20 I/O I O 19 I/O I O ST Analog -- Digital I/O. Analog input 15. ECCP1 PWM output B. ST Analog -- Digital I/O. Analog input 14. ECCP1 PWM output C. ST Analog -- Digital I/O. Analog input 13. ECCP3 PWM output B. ST Analog -- Digital I/O. Analog input 12. ECCP3 PWM output C. ST TTL Digital I/O. External memory address/data 19. ST TTL Digital I/O. External memory address/data 18. ST TTL Digital I/O. External memory address/data 17. ST TTL Digital I/O. External memory address/data 16.
Note 1: 2: 3: 4: 5:
TTL = TTL compatible input CMOS = CMOS compatible input or output ST = Schmitt Trigger input with CMOS levels Analog = Analog input I = Input O = Output P = Power OD = Open-Drain (no P diode to VDD) Alternate assignment for ECCP2/P2A when configuration bit CCP2MX is cleared (Extended Microcontroller mode). Default assignment for ECCP2/P2A for all devices in all operating modes (CCP2MX is set). Default assignments for P1B/P1C/P3B/P3C (ECCPMX configuration bit is set). Alternate assignment for ECCP2/P2A when CCP2MX is cleared (Microcontroller mode). Alternate assignments for P1B/P1C/P3B/P3C (ECCPMX configuration bit is cleared).
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TABLE 1-4:
Pin Name TQFP
PIC18F8XJ10/8XJ15 PINOUT I/O DESCRIPTIONS (CONTINUED)
Pin Number Pin Type Buffer Type Description PORTJ is a bidirectional I/O port.
RJ0/ALE RJ0 ALE RJ1/OE RJ1 OE RJ2/WRL RJ2 WRL RJ3/WRH RJ3 WRH RJ4/BA0 RJ4 BA0 RJ5/CE RJ5 CE RJ6/LB RJ6 LB RJ7/UB RJ7 UB VSS VDD AVSS AVDD ENVREG VDDCORE/VCAP VDDCORE VCAP Legend:
62 I/O O 61 I/O O 60 I/O O 59 I/O O 39 I/O O 40 I/O O 41 I/O O 42 I/O O 11, 31, 51, 70 32, 48, 71 26 25 24 12 P P -- -- P P P P I ST -- -- -- -- -- ST Digital I/O. External memory high byte control. Ground reference for logic and I/O pins. Positive supply for peripheral digital logic and I/O pins. Ground reference for analog modules. Positive supply for analog modules. Enable for on-chip voltage regulator. Core logic power or external filter capacitor connection. Positive supply for microcontroller core logic (regulator disabled). External filter capacitor connection (regulator enabled). ST -- Digital I/O. External memory low byte control. ST -- Digital I/O External memory chip enable control. ST -- Digital I/O. External memory byte address 0 control. ST -- Digital I/O. External memory write high control. ST -- Digital I/O. External memory write low control. ST -- Digital I/O. External memory output enable. ST -- Digital I/O. External memory address latch enable.
Note 1: 2: 3: 4: 5:
TTL = TTL compatible input CMOS = CMOS compatible input or output ST = Schmitt Trigger input with CMOS levels Analog = Analog input I = Input O = Output P = Power OD = Open-Drain (no P diode to VDD) Alternate assignment for ECCP2/P2A when configuration bit CCP2MX is cleared (Extended Microcontroller mode). Default assignment for ECCP2/P2A for all devices in all operating modes (CCP2MX is set). Default assignments for P1B/P1C/P3B/P3C (ECCPMX configuration bit is set). Alternate assignment for ECCP2/P2A when CCP2MX is cleared (Microcontroller mode). Alternate assignments for P1B/P1C/P3B/P3C (ECCPMX configuration bit is cleared).
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NOTES:
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2.0
2.1
OSCILLATOR CONFIGURATIONS
Oscillator Types
FIGURE 2-1:
CRYSTAL/CERAMIC RESONATOR OPERATION (HS OR HSPLL CONFIGURATION)
OSC1 To Internal Logic Sleep
The PIC18F87J10 family of devices can be operated in five different oscillator modes: 1. 2. 3. 4. 5. HS High-Speed Crystal/Resonator HSPLL High-Speed Crystal/Resonator with Software PLL Control EC External Clock with FOSC/4 Output ECPLL External Clock with Software PLL Control INTRC Internal 31 kHz Oscillator
C1(1)
XTAL
OSC2 C2(1) Note 1: 2: 3: RS(2)
RF(3)
PIC18F87J10
Four of these are selected by the user by programming the FOSC2:FOSC0 configuration bits. The fifth mode (INTRC) may be invoked under software control; it can also be configured as the default mode on device Resets.
See Table 2-1 and Table 2-2 for initial values of C1 and C2. A series resistor (RS) may be required for AT strip cut crystals. RF varies with the oscillator mode chosen.
2.2
Crystal Oscillator/Ceramic Resonators (HS Modes)
TABLE 2-1:
CAPACITOR SELECTION FOR CERAMIC RESONATORS
Typical Capacitor Values Used: In HS or HSPLL Oscillator modes, a crystal or ceramic resonator is connected to the OSC1 and OSC2 pins to establish oscillation. Figure 2-1 shows the pin connections. The oscillator design requires the use of a parallel cut crystal. Note: Use of a series cut crystal may give a frequency out of the crystal manufacturer's specifications. Mode HS Freq. 8.0 MHz 16.0 MHz OSC1 27 pF 22 pF OSC2 27 pF 22 pF
Capacitor values are for design guidance only. These capacitors were tested with the resonators listed below for basic start-up and operation. These values are not optimized. Different capacitor values may be required to produce acceptable oscillator operation. The user should test the performance of the oscillator over the expected VDD and temperature range for the application. See the notes following Table 2-2 for additional information. Resonators Used: 4.0 MHz 8.0 MHz 16.0 MHz
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TABLE 2-2: CAPACITOR SELECTION FOR CRYSTAL OSCILLATOR
Crystal Freq. 4 MHz 8 MHz 20 MHz Typical Capacitor Values Tested: C1 HS 27 pF 22 pF 15 pF C2 27 pF 22 pF 15 pF
2.3
External Clock Input (EC Modes)
Osc Type
The EC and ECPLL Oscillator modes require an external clock source to be connected to the OSC1 pin. There is no oscillator start-up time required after a Power-on Reset or after an exit from Sleep mode. In the EC Oscillator mode, the oscillator frequency divided by 4 is available on the OSC2 pin. This signal may be used for test purposes or to synchronize other logic. Figure 2-2 shows the pin connections for the EC Oscillator mode.
Capacitor values are for design guidance only. These capacitors were tested with the crystals listed below for basic start-up and operation. These values are not optimized. Different capacitor values may be required to produce acceptable oscillator operation. The user should test the performance of the oscillator over the expected VDD and temperature range for the application. See the notes following this table for additional information. Crystals Used: 4 MHz 8 MHz 20 MHz
FIGURE 2-2:
EXTERNAL CLOCK INPUT OPERATION (EC CONFIGURATION)
Clock from Ext. System FOSC/4
OSC1/CLKI
PIC18F87J10
OSC2/CLKO
An external clock source may also be connected to the OSC1 pin in the HS mode, as shown in Figure 2-3. In this configuration, the divide-by-4 output on OSC2 is not available.
Note 1: Higher capacitance increases the stability of oscillator but also increases the start-up time. 2: Since each resonator/crystal has its own characteristics, the user should consult the resonator/crystal manufacturer for appropriate values of external components. 3: Rs may be required to avoid overdriving crystals with low drive level specification. 4: Always verify oscillator performance over the VDD and temperature range that is expected for the application.
FIGURE 2-3:
EXTERNAL CLOCK INPUT OPERATION (HS OSC CONFIGURATION)
Clock from Ext. System Open
OSC1
PIC18F87J10
OSC2 (HS Mode)
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2.4 PLL Frequency Multiplier
FIGURE 2-4: PLL BLOCK DIAGRAM
A Phase Locked Loop (PLL) circuit is provided as an option for users who want to use a lower frequency oscillator circuit, or to clock the device up to its highest rated frequency from a crystal oscillator. This may be useful for customers who are concerned with EMI due to high-frequency crystals, or users who require higher clock speeds from an internal oscillator. For these reasons, the HSPLL and ECPLL modes are available. The HSPLL and ECPLL modes provide the ability to selectively run the device at 4 times the external oscillating source to produce frequencies up to 40 MHz. The PLL is enabled by setting the PLLEN bit in the OSCTUNE register (Register 2-1).
HSPLL or ECPLL (CONFIG2L) PLL Enable (OSCTUNE)
OSC2
HS or EC OSC1 Mode
FIN FOUT
Phase Comparator
Loop Filter
/4
VCO MUX
SYSCLK
REGISTER 2-1:
OSCTUNE: PLL CONTROL REGISTER
U-0 -- bit 7 R/W-0(1) PLLEN(1) U-0 -- U-0 -- U-0 -- U-0 -- U-0 -- U-0 -- bit 0
bit 7 bit 6
Unimplemented: Read as `0' PLLEN: Frequency Multiplier PLL Enable bit(1) 1 = PLL enabled 0 = PLL disabled Note 1: Available only for ECPLL and HSPLL oscillator configurations; otherwise, this bit is unavailable and read as `0'.
bit 5-0
Unimplemented: Read as `0' Legend: R = Readable bit -n = Value at POR W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown
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2.5 Internal Oscillator Block
The PIC18F87J10 family of devices includes an internal oscillator source (INTRC) which provides a nominal 31 kHz output. The INTRC is enabled on device power-up and clocks the device during its configuration cycle until it enters operating mode. INTRC is also enabled if it is selected as the device clock source or if any of the following are enabled: * Fail-Safe Clock Monitor * Watchdog Timer * Two-Speed Start-up These features are discussed in greater detail in Section 23.0 "Special Features of the CPU". The INTRC can also be optionally configured as the default clock source on device start-up by setting the FOSC2 configuration bit. This is discussed in Section 2.6.1 "Oscillator Control Register". * Primary oscillators * Secondary oscillators * Internal oscillator The primary oscillators include the External Crystal and Resonator modes and the External Clock modes. The particular mode is defined by the FOSC2:FOSC0 configuration bits. The details of these modes are covered earlier in this chapter. The secondary oscillators are those external sources not connected to the OSC1 or OSC2 pins. These sources may continue to operate even after the controller is placed in a power-managed mode. PIC18F87J10 family devices offer the Timer1 oscillator as a secondary oscillator. This oscillator, in all power-managed modes, is often the time base for functions such as a real-time clock. Most often, a 32.768 kHz watch crystal is connected between the RC0/T1OSO/T13CKI and RC1/T1OSI pins. Loading capacitors are also connected from each pin to ground. The Timer1 oscillator is discussed in greater detail in Section 12.3 "Timer1 Oscillator". In addition to being a primary clock source, the internal oscillator is available as a power-managed mode clock source. The INTRC source is also used as the clock source for several special features, such as the WDT and Fail-Safe Clock Monitor. The clock sources for the PIC18F87J10 family devices are shown in Figure 2-5. See Section 23.0 "Special Features of the CPU" for Configuration register details.
2.6
Clock Sources and Oscillator Switching
The PIC18F87J10 family includes a feature that allows the device clock source to be switched from the main oscillator to an alternate clock source. PIC18F87J10 family devices offer two alternate clock sources. When an alternate clock source is enabled, the various power-managed operating modes are available. Essentially, there are three clock sources for these devices:
FIGURE 2-5:
PIC18F87J10 FAMILY CLOCK DIAGRAM
PIC18F87J10 Family Primary Oscillator
OSC2 Sleep OSC1 Secondary Oscillator T1OSO T1OSCEN Enable Oscillator 4 x PLL
HS, EC HSPLL, ECPLL T1OSC MUX Peripherals
T1OSI
INTRC Source
Internal Oscillator CPU
IDLEN Clock Control FOSC2:FOSC0 OSCCON<1:0> Clock Source Option for other Modules WDT, PWRT, FSCM and Two-Speed Start-up
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2.6.1 OSCILLATOR CONTROL REGISTER 2.6.1.1
The OSCCON register (Register 2-2) controls several aspects of the device clock's operation, both in full power operation and in power-managed modes. The System Clock Select bits, SCS1:SCS0, select the clock source. The available clock sources are the primary clock (defined by the FOSC2:FOSC0 configuration bits), the secondary clock (Timer1 oscillator) and the internal oscillator. The clock source changes after one or more of the bits are written to, following a brief clock transition interval. The OSTS (OSCCON<3>) and T1RUN (T1CON<6>) bits indicate which clock source is currently providing the device clock. The OSTS bit indicates that the Oscillator Start-up Timer (OST) has timed out and the primary clock is providing the device clock in primary clock modes. The T1RUN bit indicates when the Timer1 oscillator is providing the device clock in secondary clock modes. In power-managed modes, only one of these bits will be set at any time. If neither of these bits are set, the INTRC is providing the clock, or the internal oscillator has just started and is not yet stable. The IDLEN bit determines if the device goes into Sleep mode or one of the Idle modes when the SLEEP instruction is executed. The use of the flag and control bits in the OSCCON register is discussed in more detail in Section 3.0 "Power-Managed Modes". Note 1: The Timer1 oscillator must be enabled to select the secondary clock source. The Timer1 oscillator is enabled by setting the T1OSCEN bit in the Timer1 Control register (T1CON<3>). If the Timer1 oscillator is not enabled, then any attempt to select a secondary clock source when executing a SLEEP instruction will be ignored. 2: It is recommended that the Timer1 oscillator be operating and stable before executing the SLEEP instruction or a very long delay may occur while the Timer1 oscillator starts.
System Clock Selection and the FOSC2 Configuration Bit
The SCS bits are cleared on all forms of Reset. In the device's default configuration, this means the primary oscillator defined by FOSC1:FOSC0 (that is, one of the HC or EC modes) is used as the primary clock source on device Resets. The default clock configuration on Reset can be changed with the FOSC2 configuration bit. The effect of this bit is to set the clock source selected when SCS1:SCS0 = 00. When FOSC2 = 1 (default), the oscillator source defined by FOSC1:FOSC0 is selected whenever SCS1:SCS0 = 00. When FOSC2 = 0, the INTRC oscillator is selected whenever SCS1:SCS2 = 00. Because the SCS bits are cleared on Reset, the FOSC2 setting also changes the default oscillator mode on Reset. Regardless of the setting of FOSC2, INTRC will always be enabled on device power-up. It will serve as the clock source until the device has loaded its configuration values from memory. It is at this point that the FOSC configuration bits are read and the oscillator selection of operational mode is made. Note that either the primary clock or the internal oscillator will have two bit setting options, at any given time, depending on the setting of FOSC2.
2.6.2
OSCILLATOR TRANSITIONS
PIC18F87J10 family devices contain circuitry to prevent clock "glitches" when switching between clock sources. A short pause in the device clock occurs during the clock switch. The length of this pause is the sum of two cycles of the old clock source and three to four cycles of the new clock source. This formula assumes that the new clock source is stable. Clock transitions are discussed in greater detail in Section 3.1.2 "Entering Power-Managed Modes".
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REGISTER 2-2: OSCCON: OSCILLATOR CONTROL REGISTER
R/W-0 IDLEN bit 7 bit 7 IDLEN: Idle Enable bit 1 = Device enters Idle mode on SLEEP instruction 0 = Device enters Sleep mode on SLEEP instruction Unimplemented: Read as `0' OSTS: Oscillator Start-up Time-out Status bit(1) 1 = Oscillator Start-up Timer time-out has expired; primary oscillator is running 0 = Oscillator Start-up Timer time-out is running; primary oscillator is not ready Note 1: The Reset value is `0' when HS mode and Two-Speed Start-up are both enabled; otherwise, it is `1'. bit 2 bit 1-0 Unimplemented: Read as `0' SCS1:SCS0: System Clock Select bits 11 = Internal oscillator 10 = Primary oscillator 01 = Timer1 oscillator When FOSC2 = 1: 00 = Primary oscillator When FOSC2 = 0: 00 = Internal oscillator Legend: U = Unimplemented, read as `0' -n = Value at POR R = Readable bit `q' = Value determined by configuration `0' = Bit is cleared W = Writable bit U-0 -- U-0 -- U-0 -- R-q(1) OSTS U-0 -- R/W-0 SCS1 R/W-0 SCS0 bit 0
bit 6-4 bit 3
2.7
Effects of Power-Managed Modes on the Various Clock Sources
When PRI_IDLE mode is selected, the designated primary oscillator continues to run without interruption. For all other power-managed modes, the oscillator using the OSC1 pin is disabled. The OSC1 pin (and OSC2 pin if used by the oscillator) will stop oscillating. In Secondary Clock modes (SEC_RUN and SEC_IDLE), the Timer1 oscillator is operating and providing the device clock. The Timer1 oscillator may also run in all power-managed modes if required to clock Timer1 or Timer3. In RC_RUN and RC_IDLE modes, the internal oscillator provides the device clock source. The 31 kHz INTRC output can be used directly to provide the clock and may be enabled to support various special features, regardless of the power-managed mode (see Section 23.2 "Watchdog Timer (WDT)" through Section 23.5 "Fail-Safe Clock Monitor" for more information on WDT, Fail-Safe Clock Monitor and Two-Speed Start-up).
If the Sleep mode is selected, all clock sources are stopped. Since all the transistor switching currents have been stopped, Sleep mode achieves the lowest current consumption of the device (only leakage currents). Enabling any on-chip feature that will operate during Sleep will increase the current consumed during Sleep. The INTRC is required to support WDT operation. The Timer1 oscillator may be operating to support a real-time clock. Other features may be operating that do not require a device clock source (i.e., SSP slave, PSP, INTn pins and others). Peripherals that may add significant current consumption are listed in Section 26.2 "DC Characteristics: Power-Down and Supply Current".
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2.8 Power-up Delays
Power-up delays are controlled by two timers, so that no external Reset circuitry is required for most applications. The delays ensure that the device is kept in Reset until the device power supply is stable under normal circumstances and the primary clock is operating and stable. For additional information on power-up delays, see Section 4.5 "Power-up Timer (PWRT)". The first timer is the Power-up Timer (PWRT), which provides a fixed delay on power-up (parameter 33, Table 26-12). It is always enabled. The second timer is the Oscillator Start-up Timer (OST), intended to keep the chip in Reset until the crystal oscillator is stable (HS modes). The OST does this by counting 1024 oscillator cycles before allowing the oscillator to clock the device. There is a delay of interval TCSD (parameter 38, Table 26-12), following POR, while the controller becomes ready to execute instructions.
TABLE 2-3:
EC, ECPLL HS, HSPLL Note:
OSC1 AND OSC2 PIN STATES IN SLEEP MODE
OSC1 Pin Floating, pulled by external clock Feedback inverter disabled at quiescent voltage level OSC2 Pin At logic low (clock/4 output) Feedback inverter disabled at quiescent voltage level
Oscillator Mode
See Table 4-2 in Section 4.0 "Reset" for time-outs due to Sleep and MCLR Reset.
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NOTES:
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3.0 POWER-MANAGED MODES
3.1.1 CLOCK SOURCES
The PIC18F87J10 family devices provide the ability to manage power consumption by simply managing clocking to the CPU and the peripherals. In general, a lower clock frequency and a reduction in the number of circuits being clocked constitutes lower consumed power. For the sake of managing power in an application, there are three primary modes of operation: * Run mode * Idle mode * Sleep mode These modes define which portions of the device are clocked and at what speed. The Run and Idle modes may use any of the three available clock sources (primary, secondary or internal oscillator block); the Sleep mode does not use a clock source. The power-managed modes include several power-saving features offered on previous PICmicro(R) devices. One is the clock switching feature, offered in other PIC18 devices, allowing the controller to use the Timer1 oscillator in place of the primary oscillator. Also included is the Sleep mode, offered by all PICmicro devices, where all device clocks are stopped. The SCS1:SCS0 bits allow the selection of one of three clock sources for power-managed modes. They are: * the primary clock, as defined by the FOSC2:FOSC0 configuration bits * the secondary clock (Timer1 oscillator) * the internal oscillator
3.1.2
ENTERING POWER-MANAGED MODES
Switching from one power-managed mode to another begins by loading the OSCCON register. The SCS1:SCS0 bits select the clock source and determine which Run or Idle mode is to be used. Changing these bits causes an immediate switch to the new clock source, assuming that it is running. The switch may also be subject to clock transition delays. These are discussed in Section 3.1.3 "Clock Transitions and Status Indicators" and subsequent sections. Entry to the power-managed Idle or Sleep modes is triggered by the execution of a SLEEP instruction. The actual mode that results depends on the status of the IDLEN bit. Depending on the current mode and the mode being switched to, a change to a power-managed mode does not always require setting all of these bits. Many transitions may be done by changing the oscillator select bits, or changing the IDLEN bit, prior to issuing a SLEEP instruction. If the IDLEN bit is already configured correctly, it may only be necessary to perform a SLEEP instruction to switch to the desired mode.
3.1
Selecting Power-Managed Modes
Selecting a power-managed mode requires two decisions: if the CPU is to be clocked or not and which clock source is to be used. The IDLEN bit (OSCCON<7>) controls CPU clocking, while the SCS1:SCS0 bits (OSCCON<1:0>) select the clock source. The individual modes, bit settings, clock sources and affected modules are summarized in Table 3-1.
TABLE 3-1:
Mode Sleep PRI_RUN SEC_RUN RC_RUN PRI_IDLE SEC_IDLE RC_IDLE Note 1:
POWER-MANAGED MODES
OSCCON bits IDLEN<7>(1) SCS1:SCS0<1:0> 0 N/A N/A N/A 1 1 1 N/A 10 01 11 10 01 11 Module Clocking Available Clock and Oscillator Source CPU Off Clocked Clocked Clocked Off Off Off Peripherals Off Clocked Clocked Clocked Clocked Clocked Clocked None - All clocks are disabled Primary - HS, EC, HSPLL, ECPLL; this is the normal full power execution mode. Secondary - Timer1 Oscillator Internal Oscillator Primary - HS, EC, HSPLL, ECPLL Secondary - Timer1 Oscillator Internal Oscillator
IDLEN reflects its value when the SLEEP instruction is executed.
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3.1.3 CLOCK TRANSITIONS AND STATUS INDICATORS
3.2
Run Modes
The length of the transition between clock sources is the sum of two cycles of the old clock source and three to four cycles of the new clock source. This formula assumes that the new clock source is stable. Two bits indicate the current clock source and its status: OSTS (OSCCON<3>) and T1RUN (T1CON<6>). In general, only one of these bits will be set while in a given power-managed mode. When the OSTS bit is set, the primary clock is providing the device clock. When the T1RUN bit is set, the Timer1 oscillator is providing the clock. If neither of these bits is set, INTRC is clocking the device. Note: Executing a SLEEP instruction does not necessarily place the device into Sleep mode. It acts as the trigger to place the controller into either the Sleep mode or one of the Idle modes, depending on the setting of the IDLEN bit.
In the Run modes, clocks to both the core and peripherals are active. The difference between these modes is the clock source.
3.2.1
PRI_RUN MODE
The PRI_RUN mode is the normal, full power execution mode of the microcontroller. This is also the default mode upon a device Reset unless Two-Speed Start-up is enabled (see Section 23.4 "Two-Speed Start-up" for details). In this mode, the OSTS bit is set. (see Section 2.6.1 "Oscillator Control Register").
3.2.2
SEC_RUN MODE
The SEC_RUN mode is the compatible mode to the "clock switching" feature offered in other PIC18 devices. In this mode, the CPU and peripherals are clocked from the Timer1 oscillator. This gives users the option of lower power consumption while still using a high-accuracy clock source. SEC_RUN mode is entered by setting the SCS1:SCS0 bits to `01'. The device clock source is switched to the Timer1 oscillator (see Figure 3-1), the primary oscillator is shut-down, the T1RUN bit (T1CON<6>) is set and the OSTS bit is cleared.
3.1.4
MULTIPLE SLEEP COMMANDS
The power-managed mode that is invoked with the SLEEP instruction is determined by the setting of the IDLEN bit at the time the instruction is executed. If another SLEEP instruction is executed, the device will enter the power-managed mode specified by IDLEN at that time. If IDLEN has changed, the device will enter the new power-managed mode specified by the new setting.
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Note: The Timer1 oscillator should already be running prior to entering SEC_RUN mode. If the T1OSCEN bit is not set when the SCS1:SCS0 bits are set to `01', entry to SEC_RUN mode will not occur. If the Timer1 oscillator is enabled, but not yet running, device clocks will be delayed until the oscillator has started. In such situations, initial oscillator operation is far from stable and unpredictable operation may result. On transitions from SEC_RUN mode to PRI_RUN, the peripherals and CPU continue to be clocked from the Timer1 oscillator while the primary clock is started. When the primary clock becomes ready, a clock switch back to the primary clock occurs (see Figure 3-2). When the clock switch is complete, the T1RUN bit is cleared, the OSTS bit is set and the primary clock is providing the clock. The IDLEN and SCS bits are not affected by the wake-up; the Timer1 oscillator continues to run.
FIGURE 3-1:
TRANSITION TIMING FOR ENTRY TO SEC_RUN MODE
Q1 Q2 Q3 Q4 Q1 Q2 1 2 3 Clock Transition n-1 n Q3 Q4 Q1 Q2 Q3
T1OSI OSC1 CPU Clock Peripheral Clock Program Counter PC
PC + 2
PC + 4
FIGURE 3-2:
TRANSITION TIMING FROM SEC_RUN MODE TO PRI_RUN MODE (HSPLL)
Q1 T1OSI OSC1 TOST(1) TPLL(1) 1 2 n-1 n Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3
PLL Clock Output
Clock Transition CPU Clock Peripheral Clock Program Counter SCS1:SCS0 bits Changed PC OSTS bit Set PC + 2 PC + 4
Note 1: TOST = 1024 TOSC; TPLL = 2 ms (approx). These intervals are not shown to scale.
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3.2.3 RC_RUN MODE
In RC_RUN mode, the CPU and peripherals are clocked from the internal oscillator; the primary clock is shut-down. This mode provides the best power conservation of all the Run modes, while still executing code. It works well for user applications which are not highly timing sensitive or do not require high-speed clocks at all times. This mode is entered by setting SCS to `11'. When the clock source is switched to the INTRC (see Figure 3-3), the primary oscillator is shut-down and the OSTS bit is cleared. On transitions from RC_RUN mode to PRI_RUN mode, the device continues to be clocked from the INTRC while the primary clock is started. When the primary clock becomes ready, a clock switch to the primary clock occurs (see Figure 3-4). When the clock switch is complete, the OSTS bit is set and the primary clock is providing the device clock. The IDLEN and SCS bits are not affected by the switch. The INTRC source will continue to run if either the WDT or the Fail-Safe Clock Monitor is enabled.
FIGURE 3-3:
TRANSITION TIMING TO RC_RUN MODE
Q1 Q2 Q3 Q4 Q1 Q2 1 2 3 Clock Transition n-1 n Q3 Q4 Q1 Q2 Q3
INTRC OSC1 CPU Clock Peripheral Clock Program Counter PC
PC + 2
PC + 4
FIGURE 3-4:
TRANSITION TIMING FROM RC_RUN MODE TO PRI_RUN MODE
Q1 INTRC OSC1 TOST(1) TPLL(1) 1 2 n-1 n Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3
PLL Clock Output
Clock Transition CPU Clock Peripheral Clock Program Counter SCS1:SCS0 bits Changed PC OSTS bit Set PC + 2 PC + 4
Note 1: TOST = 1024 TOSC; TPLL = 2 ms (approx). These intervals are not shown to scale.
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3.3 Sleep Mode 3.4 Idle Modes
The power-managed Sleep mode is identical to the legacy Sleep mode offered in all other PICmicro devices. It is entered by clearing the IDLEN bit (the default state on device Reset) and executing the SLEEP instruction. This shuts down the selected oscillator (Figure 3-5). All clock source status bits are cleared. Entering the Sleep mode from any other mode does not require a clock switch. This is because no clocks are needed once the controller has entered Sleep. If the WDT is selected, the INTRC source will continue to operate. If the Timer1 oscillator is enabled, it will also continue to run. When a wake event occurs in Sleep mode (by interrupt, Reset or WDT time-out), the device will not be clocked until the clock source selected by the SCS1:SCS0 bits becomes ready (see Figure 3-6), or it will be clocked from the internal oscillator if either the Two-Speed Start-up or the Fail-Safe Clock Monitor are enabled (see Section 23.0 "Special Features of the CPU"). In either case, the OSTS bit is set when the primary clock is providing the device clocks. The IDLEN and SCS bits are not affected by the wake-up. The Idle modes allow the controller's CPU to be selectively shut-down while the peripherals continue to operate. Selecting a particular Idle mode allows users to further manage power consumption. If the IDLEN bit is set to a `1' when a SLEEP instruction is executed, the peripherals will be clocked from the clock source selected using the SCS1:SCS0 bits; however, the CPU will not be clocked. The clock source status bits are not affected. Setting IDLEN and executing a SLEEP instruction provides a quick method of switching from a given Run mode to its corresponding Idle mode. If the WDT is selected, the INTRC source will continue to operate. If the Timer1 oscillator is enabled, it will also continue to run. Since the CPU is not executing instructions, the only exits from any of the Idle modes are by interrupt, WDT time-out or a Reset. When a wake event occurs, CPU execution is delayed by an interval of TCSD (parameter 38, Table 26-12) while it becomes ready to execute code. When the CPU begins executing code, it resumes with the same clock source for the current Idle mode. For example, when waking from RC_IDLE mode, the internal oscillator block will clock the CPU and peripherals (in other words, RC_RUN mode). The IDLEN and SCS bits are not affected by the wake-up. While in any Idle mode or the Sleep mode, a WDT time-out will result in a WDT wake-up to the Run mode currently specified by the SCS1:SCS0 bits.
FIGURE 3-5:
OSC1 CPU Clock Peripheral Clock Sleep Program Counter PC
TRANSITION TIMING FOR ENTRY TO SLEEP MODE
Q1 Q2 Q3 Q4 Q1
PC + 2
FIGURE 3-6:
TRANSITION TIMING FOR WAKE FROM SLEEP (HSPLL)
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
OSC1 PLL Clock Output CPU Clock Peripheral Clock Program Counter Wake Event PC OSTS bit Set PC + 2 PC + 4 PC + 6 TOST(1) TPLL(1)
Note1: TOST = 1024 TOSC; TPLL = 2 ms (approx). These intervals are not shown to scale.
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3.4.1 PRI_IDLE MODE 3.4.2 SEC_IDLE MODE
This mode is unique among the three Low-Power Idle modes, in that it does not disable the primary device clock. For timing sensitive applications, this allows for the fastest resumption of device operation with its more accurate primary clock source, since the clock source does not have to "warm up" or transition from another oscillator. PRI_IDLE mode is entered from PRI_RUN mode by setting the IDLEN bit and executing a SLEEP instruction. If the device is in another Run mode, set IDLEN first, then set the SCS bits to `10' and execute SLEEP. Although the CPU is disabled, the peripherals continue to be clocked from the primary clock source specified by the FOSC1:FOSC0 configuration bits. The OSTS bit remains set (see Figure 3-7). When a wake event occurs, the CPU is clocked from the primary clock source. A delay of interval TCSD is required between the wake event and when code execution starts. This is required to allow the CPU to become ready to execute instructions. After the wake-up, the OSTS bit remains set. The IDLEN and SCS bits are not affected by the wake-up (see Figure 3-8). In SEC_IDLE mode, the CPU is disabled but the peripherals continue to be clocked from the Timer1 oscillator. This mode is entered from SEC_RUN by setting the IDLEN bit and executing a SLEEP instruction. If the device is in another Run mode, set IDLEN first, then set SCS1:SCS0 to `01' and execute SLEEP. When the clock source is switched to the Timer1 oscillator, the primary oscillator is shut-down, the OSTS bit is cleared and the T1RUN bit is set. When a wake event occurs, the peripherals continue to be clocked from the Timer1 oscillator. After an interval of TCSD following the wake event, the CPU begins executing code being clocked by the Timer1 oscillator. The IDLEN and SCS bits are not affected by the wake-up; the Timer1 oscillator continues to run (see Figure 3-8). Note: The Timer1 oscillator should already be running prior to entering SEC_IDLE mode. If the T1OSCEN bit is not set when the SLEEP instruction is executed, the SLEEP instruction will be ignored and entry to SEC_IDLE mode will not occur. If the Timer1 oscillator is enabled, but not yet running, peripheral clocks will be delayed until the oscillator has started. In such situations, initial oscillator operation is far from stable and unpredictable operation may result.
FIGURE 3-7:
TRANSITION TIMING FOR ENTRY TO IDLE MODE
Q1 Q2 Q3 Q4 Q1
OSC1 CPU Clock Peripheral Clock Program Counter PC PC + 2
FIGURE 3-8:
TRANSITION TIMING FOR WAKE FROM IDLE TO RUN MODE
Q1 Q2 Q3 Q4
OSC1 TCSD CPU Clock Peripheral Clock Program Counter Wake Event PC
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3.4.3 RC_IDLE MODE 3.5.2 EXIT BY WDT TIME-OUT
In RC_IDLE mode, the CPU is disabled but the peripherals continue to be clocked from the internal oscillator. This mode allows for controllable power conservation during Idle periods. From RC_RUN, this mode is entered by setting the IDLEN bit and executing a SLEEP instruction. If the device is in another Run mode, first set IDLEN, then clear the SCS bits and execute SLEEP. When the clock source is switched to the INTRC, the primary oscillator is shut-down and the OSTS bit is cleared. When a wake event occurs, the peripherals continue to be clocked from the INTRC. After a delay of TCSD following the wake event, the CPU begins executing code being clocked by the INTRC. The IDLEN and SCS bits are not affected by the wake-up. The INTRC source will continue to run if either the WDT or the Fail-Safe Clock Monitor is enabled. A WDT time-out will cause different actions depending on which power-managed mode the device is in when the time-out occurs. If the device is not executing code (all Idle modes and Sleep mode), the time-out will result in an exit from the power-managed mode (see Section 3.2 "Run Modes" and Section 3.3 "Sleep Mode"). If the device is executing code (all Run modes), the time-out will result in a WDT Reset (see Section 23.2 "Watchdog Timer (WDT)"). The WDT timer and postscaler are cleared by one of the following events: * executing a SLEEP or CLRWDT instruction * the loss of a currently selected clock source (if the Fail-Safe Clock Monitor is enabled)
3.5.3
EXIT BY RESET
3.5
Exiting Idle and Sleep Modes
Exiting an Idle or Sleep mode by Reset automatically forces the device to run from the INTRC.
An exit from Sleep mode, or any of the Idle modes, is triggered by an interrupt, a Reset or a WDT time-out. This section discusses the triggers that cause exits from power-managed modes. The clocking subsystem actions are discussed in each of the power-managed modes sections (see Section 3.2 "Run Modes", Section 3.3 "Sleep Mode" and Section 3.4 "Idle Modes").
3.5.4
EXIT WITHOUT AN OSCILLATOR START-UP DELAY
Certain exits from power-managed modes do not invoke the OST at all. There are two cases: * PRI_IDLE mode where the primary clock source is not stopped; and * the primary clock source is either the EC or ECPLL mode. In these instances, the primary clock source either does not require an oscillator start-up delay, since it is already running (PRI_IDLE), or normally does not require an oscillator start-up delay (EC). However, a fixed delay of interval TCSD following the wake event is still required when leaving Sleep and Idle modes to allow the CPU to prepare for execution. Instruction execution resumes on the first clock cycle following this delay.
3.5.1
EXIT BY INTERRUPT
Any of the available interrupt sources can cause the device to exit from an Idle mode, or the Sleep mode, to a Run mode. To enable this functionality, an interrupt source must be enabled by setting its enable bit in one of the INTCON or PIE registers. The exit sequence is initiated when the corresponding interrupt flag bit is set. On all exits from Idle or Sleep modes by interrupt, code execution branches to the interrupt vector if the GIE/GIEH bit (INTCON<7>) is set. Otherwise, code execution continues or resumes without branching (see Section 9.0 "Interrupts"). A fixed delay of interval TCSD following the wake event is required when leaving Sleep and Idle modes. This delay is required for the CPU to prepare for execution. Instruction execution resumes on the first clock cycle following this delay.
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NOTES:
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4.0 RESET
4.1 RCON Register
The PIC18F87J10 family of devices differentiate between various kinds of Reset: a) b) c) d) e) f) g) h) Power-on Reset (POR) MCLR Reset during normal operation MCLR Reset during power-managed modes Watchdog Timer (WDT) Reset (during execution) Brown-out Reset (BOR) RESET Instruction Stack Full Reset Stack Underflow Reset Device Reset events are tracked through the RCON register (Register 4-1). The lower five bits of the register indicate that a specific Reset event has occurred. In most cases, these bits can only be set by the event and must be cleared by the application after the event. The state of these flag bits, taken together, can be read to indicate the type of Reset that just occurred. This is described in more detail in Section 4.6 "Reset State of Registers". The RCON register also has a control bit for setting interrupt priority (IPEN). Interrupt priority is discussed in Section 9.0 "Interrupts".
This section discusses Resets generated by MCLR, POR and BOR and covers the operation of the various start-up timers. Stack Reset events are covered in Section 5.1.6.4 "Stack Full and Underflow Resets". WDT Resets are covered in Section 23.2 "Watchdog Timer (WDT)". A simplified block diagram of the On-Chip Reset Circuit is shown in Figure 4-1.
FIGURE 4-1:
RESET Instruction Stack Pointer
SIMPLIFIED BLOCK DIAGRAM OF ON-CHIP RESET CIRCUIT
Stack Full/Underflow Reset
External Reset MCLR
( )_IDLE Sleep WDT Time-out VDD Rise Detect POR Pulse
VDD Brown-out Reset(1) S
PWRT 32 s INTRC PWRT 65.5 ms R Q Chip_Reset
11-bit Ripple Counter
Note 1:
The ENVREG pin must be tied high to enable Brown-out Reset. The Brown-out Reset is provided by the on-chip voltage regulator when there is insufficient source voltage to maintain regulation.
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REGISTER 4-1: RCON: RESET CONTROL REGISTER
R/W-0 IPEN bit 7 bit 7 IPEN: Interrupt Priority Enable bit 1 = Enable priority levels on interrupts 0 = Disable priority levels on interrupts (PIC16CXXX Compatibility mode) Unimplemented: Read as `0' RI: RESET Instruction Flag bit 1 = The RESET instruction was not executed (set by firmware only) 0 = The RESET instruction was executed causing a device Reset (must be set in software after a Brown-out Reset occurs) TO: Watchdog Time-out Flag bit 1 = Set by power-up, CLRWDT instruction or SLEEP instruction 0 = A WDT time-out occurred PD: Power-Down Detection Flag bit 1 = Set by power-up or by the CLRWDT instruction 0 = Set by execution of the SLEEP instruction POR: Power-on Reset Status bit 1 = A Power-on Reset has not occurred (set by firmware only) 0 = A Power-on Reset occurred (must be set in software after a Power-on Reset occurs) BOR: Brown-out Reset Status bit 1 = A Brown-out Reset has not occurred (set by firmware only) 0 = A Brown-out Reset occurred (must be set in software after a Brown-out Reset occurs) Legend: R = Readable bit -n = Value at POR W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown U-0 -- U-0 -- R/W-1 RI R-1 TO R-1 PD R/W-0 POR R/W-0 BOR bit 0
bit 6-5 bit 4
bit 3
bit 2
bit 1
bit 0
Note 1: It is recommended that the POR bit be set after a Power-on Reset has been detected, so that subsequent Power-on Resets may be detected. 2: If the on-chip voltage regulator is disabled, BOR remains `0' at all times. See Section 4.4.1 "Detecting BOR" for more information. 3: Brown-out Reset is said to have occurred when BOR is `0' and POR is `1' (assuming that POR was set to `1' by software immediately after POR).
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4.2 Master Clear (MCLR)
FIGURE 4-2:
The MCLR pin provides a method for triggering a hard external Reset of the device. A Reset is generated by holding the pin low. PIC18 extended microcontroller devices have a noise filter in the MCLR Reset path which detects and ignores small pulses. The MCLR pin is not driven low by any internal Resets, including the WDT.
EXTERNAL POWER-ON RESET CIRCUIT (FOR SLOW VDD POWER-UP)
VDD
VDD D
R R1 MCLR C
4.3
Power-on Reset (POR)
Note 1:
PIC18F87J10
A Power-on Reset condition is generated on-chip whenever VDD rises above a certain threshold. This allows the device to start in the initialized state when VDD is adequate for operation. To take advantage of the POR circuitry, tie the MCLR pin through a resistor (1 k to 10 k) to VDD. This will eliminate external RC components usually needed to create a Power-on Reset delay. A minimum rise rate for VDD is specified (parameter D004). For a slow rise time, see Figure 4-2. When the device starts normal operation (i.e., exits the Reset condition), device operating parameters (voltage, frequency, temperature, etc.) must be met to ensure operation. If these conditions are not met, the device must be held in Reset until the operating conditions are met. POR events are captured by the POR bit (RCON<1>). The state of the bit is set to `0' whenever a POR occurs; it does not change for any other Reset event. POR is not reset to `1' by any hardware event. To capture multiple events, the user manually resets the bit to `1' in software following any POR.
External Power-on Reset circuit is required only if the VDD power-up slope is too slow. The diode D helps discharge the capacitor quickly when VDD powers down. R < 40 k is recommended to make sure that the voltage drop across R does not violate the device's electrical specification. R1 1 k will limit any current flowing into MCLR from external capacitor C, in the event of MCLR/VPP pin breakdown, due to Electrostatic Discharge (ESD) or Electrical Overstress (EOS).
2:
3:
4.4.1
DETECTING BOR
The BOR bit always resets to `0' on any BOR or POR event. This makes it difficult to determine if a BOR event has occurred just by reading the state of BOR alone. A more reliable method is to simultaneously check the state of both POR and BOR. This assumes that the POR bit is reset to `1' in software immediately after any POR event. If BOR is `0' while POR is `1', it can be reliably assumed that a BOR event has occurred. If the voltage regulator is disabled, Brown-out Reset functionality is disabled. In this case, the BOR bit cannot be used to determine a BOR event. The BOR bit is still cleared by a POR event.
4.4
Brown-out Reset (BOR)
The PIC18F87J10 family of devices incorporate a simple BOR function when the internal regulator is enabled (ENVREG pin is tied to VDD). Any drop of VDD below VBOR (parameter D005) for greater than time TBOR (parameter 35) will reset the device. A Reset may or may not occur if VDD falls below VBOR for less than TBOR. The chip will remain in Brown-out Reset until VDD rises above VBOR. Once a BOR has occurred, the Power-up Timer will keep the chip in Reset for TPWRT (parameter 33). If VDD drops below VBOR while the Power-up Timer is running, the chip will go back into a Brown-out Reset and the Power-up Timer will be initialized. Once VDD rises above VBOR, the Power-up Timer will execute the additional time delay.
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4.5 Power-up Timer (PWRT)
4.5.1 TIME-OUT SEQUENCE
PIC18F87J10 family devices incorporate an on-chip Power-up Timer (PWRT) to help regulate the Power-on Reset process. The PWRT is always enabled. The main function is to ensure that the device voltage is stable before code is executed. The Power-up Timer (PWRT) of the PIC18F87J10 family devices is an 11-bit counter which uses the INTRC source as the clock input. This yields an approximate time interval of 2048 x 32 s = 65.6 ms. While the PWRT is counting, the device is held in Reset. The power-up time delay depends on the INTRC clock and will vary from chip to chip due to temperature and process variation. See DC parameter 33 for details. If enabled, the PWRT time-out is invoked after the POR pulse has cleared. The total time-out will vary based on the status of the PWRT. Figure 4-3, Figure 4-4, Figure 4-5 and Figure 4-6 all depict time-out sequences on power-up with the Power-up Timer enabled. Since the time-outs occur from the POR pulse, if MCLR is kept low long enough, the PWRT will expire. Bringing MCLR high will begin execution immediately (Figure 4-5). This is useful for testing purposes, or to synchronize more than one PIC18FXXXX device operating in parallel.
FIGURE 4-3:
TIME-OUT SEQUENCE ON POWER-UP (MCLR TIED TO VDD, VDD RISE < TPWRT)
VDD MCLR INTERNAL POR TPWRT PWRT TIME-OUT
INTERNAL RESET
FIGURE 4-4:
TIME-OUT SEQUENCE ON POWER-UP (MCLR NOT TIED TO VDD): CASE 1
VDD MCLR INTERNAL POR TPWRT PWRT TIME-OUT
INTERNAL RESET
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FIGURE 4-5: TIME-OUT SEQUENCE ON POWER-UP (MCLR NOT TIED TO VDD): CASE 2
VDD MCLR INTERNAL POR TPWRT PWRT TIME-OUT
INTERNAL RESET
FIGURE 4-6:
SLOW RISE TIME (MCLR TIED TO VDD, VDD RISE > TPWRT)
3.3V VDD MCLR 0V 1V
INTERNAL POR TPWRT PWRT TIME-OUT INTERNAL RESET
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4.6 Reset State of Registers
Most registers are unaffected by a Reset. Their status is unknown on POR and unchanged by all other Resets. The other registers are forced to a "Reset state" depending on the type of Reset that occurred. Most registers are not affected by a WDT wake-up, since this is viewed as the resumption of normal operation. Status bits from the RCON register, RI, TO, PD, POR and BOR, are set or cleared differently in different Reset situations, as indicated in Table 4-1. These bits are used in software to determine the nature of the Reset. Table 4-2 describes the Reset states for all of the Special Function Registers. These are categorized by Power-on and Brown-out Resets, Master Clear and WDT Resets and WDT wake-ups.
TABLE 4-1:
STATUS BITS, THEIR SIGNIFICANCE AND THE INITIALIZATION CONDITION FOR RCON REGISTER
Program Counter(1) 0000h 0000h 0000h 0000h 0000h 0000h 0000h 0000h 0000h 0000h PC + 2 RCON Register RI 1 0 1 u u u u u u u u TO 1 u 1 1 1 0 u u u u 0 PD 1 u 1 u 0 u u u u u 0 POR 0 u u u u u u u u u u BOR 0 u 0 u u u u u u u u STKPTR Register STKFUL 0 u u u u u u 1 u u u STKUNF 0 u u u u u u u 1 1 u
Condition Power-on Reset RESET Instruction Brown-out MCLR during power-managed Run modes MCLR during power-managed Idle modes and Sleep mode WDT Time-out during Full Power or power-managed Run modes MCLR during Full Power Execution Stack Full Reset (STVREN = 1) Stack Underflow Reset (STVREN = 1) Stack Underflow Error (not an actual Reset, STVREN = 0) WDT Time-out during power-managed Idle or Sleep modes Interrupt Exit from power-managed modes
PC + 2
u
u
0
u
u
u
u
Legend: u = unchanged Note 1: When the wake-up is due to an interrupt and the GIEH or GIEL bits are set, the PC is loaded with the interrupt vector (0008h or 0018h).
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TABLE 4-2:
Register
INITIALIZATION CONDITIONS FOR ALL REGISTERS
Applicable Devices Power-on Reset, Brown-out Reset ---0 0000 0000 0000 0000 0000 00-0 0000 ---0 0000 0000 0000 0000 0000 --00 0000 0000 0000 0000 0000 0000 0000 xxxx xxxx xxxx xxxx 0000 000x 1111 1111 1100 0000 N/A N/A N/A N/A N/A ---- xxxx xxxx xxxx xxxx xxxx N/A N/A N/A N/A N/A ---- xxxx xxxx xxxx ---- 0000 MCLR Resets WDT Reset RESET Instruction Stack Resets ---0 0000 0000 0000 0000 0000 uu-0 0000 ---0 0000 0000 0000 0000 0000 --00 0000 0000 0000 0000 0000 0000 0000 uuuu uuuu uuuu uuuu 0000 000u 1111 1111 1100 0000 N/A N/A N/A N/A N/A ---- uuuu uuuu uuuu uuuu uuuu N/A N/A N/A N/A N/A ---- uuuu uuuu uuuu ---- 0000 Wake-up via WDT or Interrupt ---0 uuuu(1) uuuu uuuu(1) uuuu uuuu(1) uu-u uuuu(1) ---u uuuu uuuu uuuu PC + 2(2) --uu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu(3) uuuu uuuu(3) uuuu uuuu(3) N/A N/A N/A N/A N/A ---- uuuu uuuu uuuu uuuu uuuu N/A N/A N/A N/A N/A ---- uuuu uuuu uuuu ---- uuuu
TOSU TOSH TOSL STKPTR PCLATU PCLATH PCL TBLPTRU TBLPTRH TBLPTRL TABLAT PRODH PRODL INTCON INTCON2 INTCON3 INDF0 POSTINC0 POSTDEC0 PREINC0 PLUSW0 FSR0H FSR0L WREG INDF1 POSTINC1 POSTDEC1 PREINC1 PLUSW1 FSR1H FSR1L BSR
PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X
Legend: u = unchanged, x = unknown, - = unimplemented bit, read as `0', q = value depends on condition. Shaded cells indicate conditions do not apply for the designated device. Note 1: When the wake-up is due to an interrupt and the GIEL or GIEH bit is set, the TOSU, TOSH and TOSL are updated with the current value of the PC. The STKPTR is modified to point to the next location in the hardware stack. 2: When the wake-up is due to an interrupt and the GIEL or GIEH bit is set, the PC is loaded with the interrupt vector (0008h or 0018h). 3: One or more bits in the INTCONx or PIRx registers will be affected (to cause wake-up). 4: See Table 4-1 for Reset value for specific condition.
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TABLE 4-2:
Register
INITIALIZATION CONDITIONS FOR ALL REGISTERS (CONTINUED)
Applicable Devices Power-on Reset, Brown-out Reset N/A N/A N/A N/A N/A ---- xxxx xxxx xxxx ---x xxxx 0000 0000 xxxx xxxx 1111 1111 0--- q-00 ---- ---0 0--1 1100 xxxx xxxx xxxx xxxx 0000 0000 0000 0000 1111 1111 -000 0000 xxxx xxxx 0000 0000 0000 0000 0000 0000 0000 0000 xxxx xxxx xxxx xxxx 0-00 0000 --00 0000 0-00 0000 MCLR Resets WDT Reset RESET Instruction Stack Resets N/A N/A N/A N/A N/A ---- uuuu uuuu uuuu ---u uuuu 0000 0000 uuuu uuuu 1111 1111 0--- q-00 ---- ---0 0--q qquu uuuu uuuu uuuu uuuu u0uu uuuu 0000 0000 1111 1111 -000 0000 uuuu uuuu 0000 0000 0000 0000 0000 0000 0000 0000 uuuu uuuu uuuu uuuu 0-00 0000 --00 0000 0-00 0000 Wake-up via WDT or Interrupt N/A N/A N/A N/A N/A ---- uuuu uuuu uuuu ---u uuuu uuuu uuuu uuuu uuuu uuuu uuuu u--- q-uu ---- ---u u--u qquu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu 1111 1111 -uuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu u-uu uuuu --uu uuuu u-uu uuuu
INDF2 POSTINC2 POSTDEC2 PREINC2 PLUSW2 FSR2H FSR2L STATUS TMR0H TMR0L T0CON OSCCON WDTCON RCON
(4)
PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X
TMR1H TMR1L T1CON TMR2 PR2 T2CON SSP1BUF SSP1ADD SSP1STAT SSP1CON1 SSP1CON2 ADRESH ADRESL ADCON0 ADCON1 ADCON2
Legend: u = unchanged, x = unknown, - = unimplemented bit, read as `0', q = value depends on condition. Shaded cells indicate conditions do not apply for the designated device. Note 1: When the wake-up is due to an interrupt and the GIEL or GIEH bit is set, the TOSU, TOSH and TOSL are updated with the current value of the PC. The STKPTR is modified to point to the next location in the hardware stack. 2: When the wake-up is due to an interrupt and the GIEL or GIEH bit is set, the PC is loaded with the interrupt vector (0008h or 0018h). 3: One or more bits in the INTCONx or PIRx registers will be affected (to cause wake-up). 4: See Table 4-1 for Reset value for specific condition.
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TABLE 4-2:
Register
INITIALIZATION CONDITIONS FOR ALL REGISTERS (CONTINUED)
Applicable Devices Power-on Reset, Brown-out Reset xxxx xxxx xxxx xxxx 0000 0000 xxxx xxxx xxxx xxxx 0000 0000 xxxx xxxx xxxx xxxx 0000 0000 0000 0000 0000 0000 0000 0111 xxxx xxxx xxxx xxxx 0000 0000 0000 ---0000 0000 0000 0000 xxxx xxxx 0000 0010 0000 000x 1111 1111 0000 0000 0000 0000 11-- 1-11 00-- 0-00 00-- 0-00 1111 1111 0000 0000 0000 0000 0-00 --00 -0-- ---MCLR Resets WDT Reset RESET Instruction Stack Resets uuuu uuuu uuuu uuuu 0000 0000 uuuu uuuu uuuu uuuu 0000 0000 uuuu uuuu uuuu uuuu 0000 0000 0000 0000 0000 0000 0000 0111 uuuu uuuu uuuu uuuu uuuu uuuu 0000 ---0000 0000 0000 0000 uuuu uuuu 0000 0010 0000 000x 1111 1111 0000 0000 0000 0000 11-- 1-11 00-- 0-00 00-- 0-00 1111 1111 0000 0000 0000 0000 0-00 --00 -0-- ---Wake-up via WDT or Interrupt uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu ---uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu(3) uuuu uuuu uu-- u-uu uu-- u-uu(3) uu-- u-uu uuuu uuuu uuuu uuuu(3) uuuu uuuu u-uu --uu -u-- ----
CCPR1H CCPR1L CCP1CON CCPR2H CCPR2L CCP2CON CCPR3H CCPR3L CCP3CON ECCP1AS CVRCON CMCON TMR3H TMR3L T3CON PSPCON SPBRG1 RCREG1 TXREG1 TXSTA1 RCSTA1 IPR3 PIR3 PIE3 IPR2 PIR2 PIE2 IPR1 PIR1 PIE1 MEMCON OSCTUNE
PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X
Legend: u = unchanged, x = unknown, - = unimplemented bit, read as `0', q = value depends on condition. Shaded cells indicate conditions do not apply for the designated device. Note 1: When the wake-up is due to an interrupt and the GIEL or GIEH bit is set, the TOSU, TOSH and TOSL are updated with the current value of the PC. The STKPTR is modified to point to the next location in the hardware stack. 2: When the wake-up is due to an interrupt and the GIEL or GIEH bit is set, the PC is loaded with the interrupt vector (0008h or 0018h). 3: One or more bits in the INTCONx or PIRx registers will be affected (to cause wake-up). 4: See Table 4-1 for Reset value for specific condition.
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TABLE 4-2:
Register
INITIALIZATION CONDITIONS FOR ALL REGISTERS (CONTINUED)
Applicable Devices Power-on Reset, Brown-out Reset 1111 1111 1111 1111 ---1 1111 1111 1111111 1111 1111 1111 1111 1111 1111 1111 --11 1111 xxxx xxxx xxxx xxxx ---x xxxx xxxx xxxxxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx --xx xxxx xxxx xxxx 0000 xxxx 111x xxxx x000 000xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx --0x 0000 0000 0000 01-0 0-00 0000 0000 01-0 0-00 MCLR Resets WDT Reset RESET Instruction Stack Resets 1111 1111 1111 1111 ---1 1111 1111 1111111 1111 1111 1111 1111 1111 1111 1111 --11 1111 uuuu uuuu uuuu uuuu ---u uuuu uuuu uuuuuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu --uu uuuu uuuu uuuu uuuu uuuu 111u uuuu x000 000uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu --0u 0000 0000 0000 01-0 0-00 0000 0000 01-0 0-00 Wake-up via WDT or Interrupt uuuu uuuu uuuu uuuu ---u uuuu uuuu uuuuuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu --uu uuuu uuuu uuuu uuuu uuuu ---u uuuu uuuu uuuuuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu --uu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuuuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu --uu uuuu uuuu uuuu uu-u u-uu uuuu uuuu uu-u u-uu
TRISJ TRISH TRISG TRISF TRISE TRISD TRISC TRISB TRISA LATJ LATH LATG LATF LATE LATD LATC LATB LATA PORTJ PORTH PORTG PORTF PORTE PORTD PORTC PORTB PORTA SPBRGH1 BAUDCON1 SPBRG2 BAUDCON2
PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X
Legend: u = unchanged, x = unknown, - = unimplemented bit, read as `0', q = value depends on condition. Shaded cells indicate conditions do not apply for the designated device. Note 1: When the wake-up is due to an interrupt and the GIEL or GIEH bit is set, the TOSU, TOSH and TOSL are updated with the current value of the PC. The STKPTR is modified to point to the next location in the hardware stack. 2: When the wake-up is due to an interrupt and the GIEL or GIEH bit is set, the PC is loaded with the interrupt vector (0008h or 0018h). 3: One or more bits in the INTCONx or PIRx registers will be affected (to cause wake-up). 4: See Table 4-1 for Reset value for specific condition.
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TABLE 4-2:
Register
INITIALIZATION CONDITIONS FOR ALL REGISTERS (CONTINUED)
Applicable Devices Power-on Reset, Brown-out Reset 0000 0000 0000 0000 1111 1111 -000 0000 xxxx xxxx xxxx xxxx --00 0000 xxxx xxxx xxxx xxxx --00 0000 0000 0000 0000 0000 0000 0000 0000 0010 0000 000x 0000 0000 0000 0000 0000 0000 0000 0000 xxxx xxxx 0000 0000 0000 0000 0000 0000 0000 0000 MCLR Resets WDT Reset RESET Instruction Stack Resets 0000 0000 0000 0000 1111 1111 -000 0000 uuuu uuuu uuuu uuuu --00 0000 uuuu uuuu uuuu uuuu --00 0000 0000 0000 0000 0000 0000 0000 0000 0010 0000 000x 0000 0000 0000 0000 0000 0000 0000 0000 uuuu uuuu 0000 0000 0000 0000 0000 0000 0000 0000 Wake-up via WDT or Interrupt uuuu uuuu uuuu uuuu 1111 1111 -uuu uuuu uuuu uuuu uuuu uuuu --uu uuuu uuuu uuuu uuuu uuuu --uu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu
ECCP1DEL TMR4 PR4 T4CON CCPR4H CCPR4L CCP4CON CCPR5H CCPR5L CCP5CON SPBRG2 RCREG2 TXREG2 TXSTA2 RCSTA2 ECCP3AS ECCP3DEL ECCP2AS ECCP2DEL SSP2BUF SSP2ADD SSP2STAT SSP2CON1 SSP2CON2
PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X PIC18F6XJ1X PIC18F8XJ1X
Legend: u = unchanged, x = unknown, - = unimplemented bit, read as `0', q = value depends on condition. Shaded cells indicate conditions do not apply for the designated device. Note 1: When the wake-up is due to an interrupt and the GIEL or GIEH bit is set, the TOSU, TOSH and TOSL are updated with the current value of the PC. The STKPTR is modified to point to the next location in the hardware stack. 2: When the wake-up is due to an interrupt and the GIEL or GIEH bit is set, the PC is loaded with the interrupt vector (0008h or 0018h). 3: One or more bits in the INTCONx or PIRx registers will be affected (to cause wake-up). 4: See Table 4-1 for Reset value for specific condition.
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NOTES:
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5.0 MEMORY ORGANIZATION
5.1 Program Memory Organization
There are two types of memory in PIC18 Flash microcontroller devices: * Program Memory * Data RAM As Harvard architecture devices, the data and program memories use separate busses; this allows for concurrent access of the two memory spaces. Additional detailed information on the operation of the Flash program memory is provided in Section 6.0 "Program Memory". PIC18 microcontrollers implement a 21-bit program counter which is capable of addressing a 2-Mbyte program memory space. Accessing a location between the upper boundary of the physically implemented memory and the 2-Mbyte address will return all `0's (a NOP instruction). The entire PIC18F87J10 family offers a range of on-chip Flash program memory sizes, from 32 Kbytes (up to 16,384 single-word instructions) to 128 Kbytes (65,536 single-word instructions). The program memory maps for individual family members are shown in Figure 5-3.
FIGURE 5-1:
MEMORY MAPS FOR PIC18F87J10 FAMILY DEVICES
PC<20:0> 21
CALL, CALLW, RCALL, RETURN, RETFIE, RETLW, ADDULNK, SUBULNK
Stack Level 1 * * * Stack Level 31
PIC18FX5J10 On-Chip Memory Config. Words
PIC18FX5J15 On-Chip Memory
PIC18FX6J10 On-Chip Memory
PIC18FX6J15 On-Chip Memory
PIC18FX7J10 On-Chip Memory 000000h
005FFFh 007FFFh Config. Words Config. Words 00BFFFh 00FFFFh
Config. Words
017FFFh
Config. Words
01FFFFh
Unimplemented Read as `0'
Unimplemented Read as `0'
Unimplemented Read as `0'
Unimplemented Read as `0'
Unimplemented Read as `0'
1FFFFFh Note: Sizes of memory areas are not to scale. Sizes of program memory areas are enhanced to show detail.
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User Memory Space
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5.1.1 HARD MEMORY VECTORS 5.1.2 FLASH CONFIGURATION WORDS
All PIC18 devices have a total of three hard-coded return vectors in their program memory space. The Reset vector address is the default value to which the program counter returns on all device Resets; it is located at 0000h. PIC18 devices also have two interrupt vector addresses for the handling of high priority and low priority interrupts. The high priority interrupt vector is located at 0008h and the low priority interrupt vector is at 0018h. Their locations in relation to the program memory map are shown in Figure 5-2. Because the PIC18F87J10 family devices do not have persistent configuration memory, the top four words of on-chip program memory are reserved for configuration information. On Reset, the configuration information is copied into the Configuration registers. The Configuration Words are stored in their program memory location in numerical order, starting with the lower byte of CONFIG1 at the lowest address and ending with the upper byte of CONFIG4. For these devices, only Configuration Words, CONFIG1 through CONFIG3, are used; CONFIG4 is reserved. The actual addresses of the Flash Configuration Word for devices in the PIC18F87J10 family are shown in Table 5-1. Their location in the memory map is shown with the other memory vectors in Figure 5-2. Additional details on the device Configuration Words are provided in Section 23.1 "Configuration Bits".
FIGURE 5-2:
HARD VECTOR AND CONFIGURATION WORD LOCATIONS FOR PIC18F87J10 FAMILY DEVICES
0000h 0008h 0018h
Reset Vector High Priority Interrupt Vector Low Priority Interrupt Vector
TABLE 5-1:
FLASH CONFIGURATION WORD FOR PIC18F87J10 FAMILY DEVICES
Program Memory (Kbytes) 32 48 64 96 128 Configuration Word Addresses 7FF8h to 7FFFh BFF8h to BFFFh FFF8h to FFFFh 17FF8h to to 17FFFh 1FFF8h to to 1FFFFh
Device PIC18F65J10
On-Chip Program Memory
PIC18F85J10 PIC18F65J15 PIC18F85J15 PIC18F66J10 PIC18F86J10 PIC18F66J15 PIC18F86J15 PIC18F67J10 PIC18F87J10
Flash Configuration Words
(Top of Memory-7) (Top of Memory)
Read `0'
1FFFFFh Legend: (Top of Memory) represents upper boundary of on-chip program memory space (see Figure 5-1 for device-specific values). Shaded area represents unimplemented memory. Areas are not shown to scale.
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5.1.3 PIC18F8XJ10/8XJ15 PROGRAM MEMORY MODES
* The Extended Microcontroller Mode allows access to both internal and external program memories as a single block. The device can access its entire on-chip program memory; above this, the device accesses external program memory up to the 2-Mbyte program space limit. Execution automatically switches between the two memories as required. The setting of the EMB configuration bits also controls the address bus width of the external memory bus. This is covered in more detail in Section 7.0 "External Memory Bus". In all modes, the microcontroller has complete access to data RAM. Figure 5-3 compares the memory maps of the different program memory modes. The differences between on-chip and external memory access limitations are more fully explained in Table 5-2.
The 80-pin devices in this family can address up to a total of 2 Mbytes of program memory. This is achieved through the external memory bus. There are two distinct operating modes available to the controllers: * Microcontroller (MC) * Extended Microcontroller (EMC) The program memory mode is determined by setting the EMB configuration bits (CONFIG3L<5:4>), as shown in Register 5-1. (See also Section 23.1 "Configuration Bits" for additional details on the device configuration bits.) The program memory modes operate as follows: * The Microcontroller Mode accesses only on-chip Flash memory. Attempts to read above the top of on-chip memory causes a read of all `0's (a NOP instruction). The Microcontroller mode is also the only operating mode available to 64-pin devices.
REGISTER 5-1:
CONFIG3L: CONFIGURATION REGISTER 3 LOW
R/WO-1 WAIT bit 7 R/WO-1 BW R/WO-0 EMB1 R/WO-0 EMB0 R/WO-0 EASHFT U-0 -- U-0 -- U-0 -- bit 0
bit 7
WAIT: External Bus Wait Enable bit 1 = Wait states on the external bus are disabled 0 = Wait states on the external bus are enabled and selected by MEMCON<5:4> BW: Data Bus Width Select bit 1 = 16-Bit Data Width modes 0 = 8-Bit Data Width modes EMB1:EMB0: External Memory Bus Configuration bits 11 = Extended Microcontroller mode, 20-bit address width for external bus 10 = Extended Microcontroller mode, 16-bit address width for external bus 01 = Extended Microcontroller mode, 12-bit address width for external bus 00 = Microcontroller mode, external bus disabled EASHFT: External Address Bus Shift Enable bit 1 = Address shifting enabled - external address bus is shifted to start at 000000h 0 = Address shifting disabled - external address bus reflects the PC value Unimplemented: Read as `0' Legend: R = Readable bit -n = Value after erase WO = Write-Once bit '1' = Bit is set U = Unimplemented bit, read as `0' '0' = Bit is cleared x = Bit is unknown
bit 6
bit 5-4
bit 3
bit 2-0
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5.1.4 EXTENDED MICROCONTROLLER MODE AND ADDRESS SHIFTING
By default, devices in Extended Microcontroller mode directly present the program counter value on the external address bus for those addresses in the range of the external memory space. In practical terms, this means addresses in the external memory device below the top of on-chip memory are unavailable. To avoid this, the Extended Microcontroller mode implements an address shifting option to enable automatic address translation. In this mode, addresses presented on the external bus are shifted down by the size of the on-chip program memory and are remapped to start at 0000h. This allows the complete use of the external memory device's memory space.
FIGURE 5-3:
MEMORY MAPS FOR PIC18F87J10 FAMILY PROGRAM MEMORY MODES
Extended Microcontroller Mode(2) Extended Microcontroller Mode with Address Shifting(2) External Memory Space 000000h No Access On-Chip Program Memory (Top of Memory) (Top of Memory) + 1 External Memory On-Chip Program Memory (Top of Memory) (Top of Memory) + 1 Mapped to External Memory 1FFFFFh - Space (Top of Memory) On-Chip Memory Space 000000h
Microcontroller Mode(1)
On-Chip Memory Space 000000h On-Chip Program Memory (Top of Memory) (Top of Memory) + 1 Reads `0's
External Memory Space
On-Chip Memory Space
External Memory
Mapped to External Memory Space 1FFFFFh
1FFFFFh
1FFFFFh
Legend: Note 1: 2:
(Top of Memory) represents upper boundary of on-chip program memory space (see Figure 5-1 for device-specific values). Shaded areas represent unimplemented or inaccessible areas, depending on the mode. This mode is the only available mode on 64-pin devices and the default on 80-pin devices. These modes are only available on 80-pin devices.
TABLE 5-2:
MEMORY ACCESS FOR PIC18F8XJ10/8XJ15 PROGRAM MEMORY MODES
Internal Program Memory External Program Memory Execution From No Access Yes Table Read From No Access Yes Table Write To No Access Yes
Operating Mode
Execution From Yes Yes
Table Read From Yes Yes
Table Write To No No
Microcontroller Extended Microcontroller
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5.1.5 PROGRAM COUNTER
The Program Counter (PC) specifies the address of the instruction to fetch for execution. The PC is 21 bits wide and is contained in three separate 8-bit registers. The low byte, known as the PCL register, is both readable and writable. The high byte, or PCH register, contains the PC<15:8> bits; it is not directly readable or writable. Updates to the PCH register are performed through the PCLATH register. The upper byte is called PCU. This register contains the PC<20:16> bits; it is also not directly readable or writable. Updates to the PCU register are performed through the PCLATU register. The contents of PCLATH and PCLATU are transferred to the program counter by any operation that writes PCL. Similarly, the upper two bytes of the program counter are transferred to PCLATH and PCLATU by an operation that reads PCL. This is useful for computed offsets to the PC (see Section 5.1.8.1 "Computed GOTO"). The PC addresses bytes in the program memory. To prevent the PC from becoming misaligned with word instructions, the Least Significant bit of PCL is fixed to a value of `0'. The PC increments by 2 to address sequential instructions in the program memory. The CALL, RCALL, GOTO and program branch instructions write to the program counter directly. For these instructions, the contents of PCLATH and PCLATU are not transferred to the program counter. The stack operates as a 31-word by 21-bit RAM and a 5-bit Stack Pointer, STKPTR. The stack space is not part of either program or data space. The Stack Pointer is readable and writable and the address on the top of the stack is readable and writable through the Top-of-Stack Special File Registers. Data can also be pushed to, or popped from the stack, using these registers. A CALL type instruction causes a push onto the stack; the Stack Pointer is first incremented and the location pointed to by the Stack Pointer is written with the contents of the PC (already pointing to the instruction following the CALL). A RETURN type instruction causes a pop from the stack; the contents of the location pointed to by the STKPTR are transferred to the PC and then the Stack Pointer is decremented. The Stack Pointer is initialized to `00000' after all Resets. There is no RAM associated with the location corresponding to a Stack Pointer value of `00000'; this is only a Reset value. Status bits indicate if the stack is full or has overflowed, or has underflowed.
5.1.6.1
Top-of-Stack Access
5.1.6
RETURN ADDRESS STACK
The return address stack allows any combination of up to 31 program calls and interrupts to occur. The PC is pushed onto the stack when a CALL or RCALL instruction is executed, or an interrupt is Acknowledged. The PC value is pulled off the stack on a RETURN, RETLW or a RETFIE instruction (and on ADDULNK and SUBULNK instructions if the extended instruction set is enabled). PCLATU and PCLATH are not affected by any of the RETURN or CALL instructions.
Only the top of the return address stack (TOS) is readable and writable. A set of three registers, TOSU:TOSH:TOSL, hold the contents of the stack location pointed to by the STKPTR register (Figure 5-4). This allows users to implement a software stack if necessary. After a CALL, RCALL or interrupt (and ADDULNK and SUBULNK instructions if the extended instruction set is enabled), the software can read the pushed value by reading the TOSU:TOSH:TOSL registers. These values can be placed on a user-defined software stack. At return time, the software can return these values to TOSU:TOSH:TOSL and do a return. The user must disable the global interrupt enable bits while accessing the stack to prevent inadvertent stack corruption.
FIGURE 5-4:
RETURN ADDRESS STACK AND ASSOCIATED REGISTERS
Return Address Stack <20:0>
Top-of-Stack Registers TOSU 00h TOSH 1Ah TOSL 34h
Stack Pointer 11111 11110 11101 STKPTR<4:0> 00010
Top-of-Stack
001A34h 000D58h
00011 00010 00001 00000
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5.1.6.2 Return Stack Pointer (STKPTR)
The STKPTR register (Register 5-2) contains the Stack Pointer value, the STKFUL (Stack Full) status bit and the STKUNF (Stack Underflow) status bits. The value of the Stack Pointer can be 0 through 31. The Stack Pointer increments before values are pushed onto the stack and decrements after values are popped off the stack. On Reset, the Stack Pointer value will be zero. The user may read and write the Stack Pointer value. This feature can be used by a Real-Time Operating System (RTOS) for return stack maintenance. After the PC is pushed onto the stack 31 times (without popping any values off the stack), the STKFUL bit is set. The STKFUL bit is cleared by software or by a POR. The action that takes place when the stack becomes full depends on the state of the STVREN (Stack Overflow Reset Enable) configuration bit. (Refer to Section 23.1 "Configuration Bits" for a description of the device configuration bits.) If STVREN is set (default), the 31st push will push the (PC + 2) value onto the stack, set the STKFUL bit and reset the device. The STKFUL bit will remain set and the Stack Pointer will be set to zero. If STVREN is cleared, the STKFUL bit will be set on the 31st push and the Stack Pointer will increment to 31. Any additional pushes will not overwrite the 31st push and STKPTR will remain at 31. When the stack has been popped enough times to unload the stack, the next pop will return a value of zero to the PC and sets the STKUNF bit, while the Stack Pointer remains at zero. The STKUNF bit will remain set until cleared by software or until a POR occurs. Note: Returning a value of zero to the PC on an underflow has the effect of vectoring the program to the Reset vector, where the stack conditions can be verified and appropriate actions can be taken. This is not the same as a Reset, as the contents of the SFRs are not affected.
5.1.6.3
PUSH and POP Instructions
Since the Top-of-Stack is readable and writable, the ability to push values onto the stack and pull values off the stack, without disturbing normal program execution, is a desirable feature. The PIC18 instruction set includes two instructions, PUSH and POP, that permit the TOS to be manipulated under software control. TOSU, TOSH and TOSL can be modified to place data or a return address on the stack. The PUSH instruction places the current PC value onto the stack. This increments the Stack Pointer and loads the current PC value onto the stack. The POP instruction discards the current TOS by decrementing the Stack Pointer. The previous value pushed onto the stack then becomes the TOS value.
REGISTER 5-2:
STKPTR: STACK POINTER REGISTER
R/C-0 STKFUL(1) bit 7 R/C-0 STKUNF(1) U-0 -- R/W-0 SP4 R/W-0 SP3 R/W-0 SP2 R/W-0 SP1 R/W-0 SP0 bit 0
bit 7
STKFUL: Stack Full Flag bit(1) 1 = Stack became full or overflowed 0 = Stack has not become full or overflowed STKUNF: Stack Underflow Flag bit(1) 1 = Stack underflow occurred 0 = Stack underflow did not occur Unimplemented: Read as `0' SP4:SP0: Stack Pointer Location bits Note 1: Bit 7 and bit 6 are cleared by user software or by a POR. Legend: R = Readable bit - n = Value at POR W = Writable bit `1' = Bit is set U = Unimplemented `0' = Bit is cleared C = Clearable only bit x = Bit is unknown
bit 6
bit 5 bit 4-0
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5.1.6.4 Stack Full and Underflow Resets 5.1.8
Device Resets on stack overflow and stack underflow conditions are enabled by setting the STVREN bit in Configuration Register 4L. When STVREN is set, a full or underflow will set the appropriate STKFUL or STKUNF bit and then cause a device Reset. When STVREN is cleared, a full or underflow condition will set the appropriate STKFUL or STKUNF bit, but not cause a device Reset. The STKFUL or STKUNF bits are cleared by the user software or a Power-on Reset.
LOOK-UP TABLES IN PROGRAM MEMORY
There may be programming situations that require the creation of data structures, or look-up tables, in program memory. For PIC18 devices, look-up tables can be implemented in two ways: * Computed GOTO * Table Reads
5.1.8.1
Computed GOTO
5.1.7
FAST REGISTER STACK
A Fast Register Stack is provided for the STATUS, WREG and BSR registers, to provide a "fast return" option for interrupts. This stack is only one level deep and is neither readable nor writable. It is loaded with the current value of the corresponding register when the processor vectors for an interrupt. All interrupt sources will push values into the stack registers. The values in the registers are then loaded back into the working registers if the RETFIE, FAST instruction is used to return from the interrupt. If both low and high priority interrupts are enabled, the stack registers cannot be used reliably to return from low priority interrupts. If a high priority interrupt occurs while servicing a low priority interrupt, the stack register values stored by the low priority interrupt will be overwritten. In these cases, users must save the key registers in software during a low priority interrupt. If interrupt priority is not used, all interrupts may use the fast register stack for returns from interrupt. If no interrupts are used, the Fast Register Stack can be used to restore the STATUS, WREG and BSR registers at the end of a subroutine call. To use the Fast Register Stack for a subroutine call, a CALL label, FAST instruction must be executed to save the STATUS, WREG and BSR registers to the Fast Register Stack. A RETURN, FAST instruction is then executed to restore these registers from the Fast Register Stack. Example 5-1 shows a source code example that uses the Fast Register Stack during a subroutine call and return.
A computed GOTO is accomplished by adding an offset to the program counter. An example is shown in Example 5-2. A look-up table can be formed with an ADDWF PCL instruction and a group of RETLW nn instructions. The W register is loaded with an offset into the table before executing a call to that table. The first instruction of the called routine is the ADDWF PCL instruction. The next instruction executed will be one of the RETLW nn instructions, that returns the value `nn' to the calling function. The offset value (in WREG) specifies the number of bytes that the program counter should advance and should be multiples of 2 (LSb = 0). In this method, only one data byte may be stored in each instruction location and room on the return address stack is required.
EXAMPLE 5-2:
MOVF CALL nn00h ADDWF RETLW RETLW RETLW . . .
COMPUTED GOTO USING AN OFFSET VALUE
OFFSET, W TABLE PCL nnh nnh nnh
ORG TABLE
5.1.8.2
Table Reads
EXAMPLE 5-1:
CALL SUB1, FAST
FAST REGISTER STACK CODE EXAMPLE
;STATUS, WREG, BSR ;SAVED IN FAST REGISTER ;STACK
A better method of storing data in program memory allows two bytes of data to be stored in each instruction location. Look-up table data may be stored two bytes per program word while programming. The Table Pointer (TBLPTR) specifies the byte address and the Table Latch (TABLAT) contains the data that is read from the program memory. Data is transferred from program memory one byte at a time. Table read operation is discussed further Section 6.1 "Table Reads and Table Writes". in
* * SUB1 * * RETURN FAST
;RESTORE VALUES SAVED ;IN FAST REGISTER STACK
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5.2
5.2.1
PIC18 Instruction Cycle
CLOCKING SCHEME
5.2.2
INSTRUCTION FLOW/PIPELINING
The microcontroller clock input, whether from an internal or external source, is internally divided by four to generate four non-overlapping quadrature clocks (Q1, Q2, Q3 and Q4). Internally, the program counter is incremented on every Q1; the instruction is fetched from the program memory and latched into the instruction register during Q4. The instruction is decoded and executed during the following Q1 through Q4. The clocks and instruction execution flow are shown in Figure 5-5.
An "Instruction Cycle" consists of four Q cycles, Q1 through Q4. The instruction fetch and execute are pipelined in such a manner that a fetch takes one instruction cycle, while the decode and execute takes another instruction cycle. However, due to the pipelining, each instruction effectively executes in one cycle. If an instruction causes the program counter to change (e.g., GOTO), then two cycles are required to complete the instruction (Example 5-3). A fetch cycle begins with the Program Counter (PC) incrementing in Q1. In the execution cycle, the fetched instruction is latched into the Instruction Register (IR) in cycle Q1. This instruction is then decoded and executed during the Q2, Q3 and Q4 cycles. Data memory is read during Q2 (operand read) and written during Q4 (destination write).
FIGURE 5-5:
CLOCK/INSTRUCTION CYCLE
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
OSC1 Q1 Q2 Q3 Q4 PC OSC2/CLKO (RC mode)
Execute INST (PC - 2) Fetch INST (PC) Execute INST (PC) Fetch INST (PC + 2) PC PC + 2 PC + 4 Internal Phase Clock
Execute INST (PC + 2) Fetch INST (PC + 4)
EXAMPLE 5-3:
INSTRUCTION PIPELINE FLOW
TCY0 TCY1 Execute 1 Fetch 2 Execute 2 Fetch 3 Execute 3 Fetch 4 Flush (NOP) Fetch SUB_1 Execute SUB_1 TCY2 TCY3 TCY4 TCY5
1. MOVLW 55h 2. MOVWF PORTB 3. BRA 4. BSF SUB_1
Fetch 1
PORTA, BIT3 (Forced NOP)
5. Instruction @ address SUB_1
All instructions are single cycle, except for any program branches. These take two cycles since the fetch instruction is "flushed" from the pipeline while the new instruction is being fetched and then executed.
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5.2.3 INSTRUCTIONS IN PROGRAM MEMORY
The program memory is addressed in bytes. Instructions are stored as two bytes or four bytes in program memory. The Least Significant Byte of an instruction word is always stored in a program memory location with an even address (LSB = 0). To maintain alignment with instruction boundaries, the PC increments in steps of 2 and the LSB will always read `0' (see Section 5.1.5 "Program Counter"). Figure 5-6 shows an example of how instruction words are stored in the program memory. The CALL and GOTO instructions have the absolute program memory address embedded into the instruction. Since instructions are always stored on word boundaries, the data contained in the instruction is a word address. The word address is written to PC<20:1> which accesses the desired byte address in program memory. Instruction #2 in Figure 5-6 shows how the instruction, GOTO 0006h, is encoded in the program memory. Program branch instructions, which encode a relative address offset, operate in the same manner. The offset value stored in a branch instruction represents the number of single-word instructions that the PC will be offset by. Section 24.0 "Instruction Set Summary" provides further details of the instruction set.
FIGURE 5-6:
INSTRUCTIONS IN PROGRAM MEMORY
LSB = 1 Program Memory Byte Locations LSB = 0 Word Address 000000h 000002h 000004h 000006h 000008h 00000Ah 00000Ch 00000Eh 000010h 000012h 000014h
Instruction 1: Instruction 2: Instruction 3:
MOVLW GOTO MOVFF
055h 0006h 123h, 456h
0Fh EFh F0h C1h F4h
55h 03h 00h 23h 56h
5.2.4
TWO-WORD INSTRUCTIONS
The standard PIC18 instruction set has four two-word instructions: CALL, MOVFF, GOTO and LSFR. In all cases, the second word of the instructions always has `1111' as its four Most Significant bits; the other 12 bits are literal data, usually a data memory address. The use of `1111' in the 4 MSbs of an instruction specifies a special form of NOP. If the instruction is executed in proper sequence - immediately after the first word - the data in the second word is accessed
and used by the instruction sequence. If the first word is skipped for some reason and the second word is executed by itself, a NOP is executed instead. This is necessary for cases when the two-word instruction is preceded by a conditional instruction that changes the PC. Example 5-4 shows how this works. Note: See Section 5.5 "Program Memory and the Extended Instruction Set" for information on two-word instructions in the extended instruction set.
EXAMPLE 5-4:
CASE 1: Object Code
TWO-WORD INSTRUCTIONS
Source Code TSTFSZ MOVFF ADDWF Source Code TSTFSZ MOVFF ADDWF REG1 REG1, REG2 REG3 ; is RAM location 0? ; Yes, execute this word ; 2nd word of instruction ; continue code REG1 REG1, REG2 REG3 ; is RAM location 0? ; No, skip this word ; Execute this word as a NOP ; continue code
0110 0110 0000 0000 1100 0001 0010 0011 1111 0100 0101 0110 0010 0100 0000 0000 CASE 2: Object Code 0110 0110 0000 0000 1100 0001 0010 0011 1111 0100 0101 0110 0010 0100 0000 0000
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5.3
Note:
Data Memory Organization
The operation of some aspects of data memory are changed when the PIC18 extended instruction set is enabled. See Section 5.6 "Data Memory and the Extended Instruction Set" for more information.
5.3.1
BANK SELECT REGISTER
The data memory in PIC18 devices is implemented as static RAM. Each register in the data memory has a 12-bit address, allowing up to 4096 bytes of data memory. The memory space is divided into as many as 16 banks that contain 256 bytes each. The PIC18FX5J10/X5J15/X6J10 devices, with up to 64 Kbytes of program memory, implement 8 complete banks for a total of 2048 bytes. PIC18FX6J15 and PIC18FX7J10 devices, with 96 or 128 Kbytes of program memory, implement all available banks and provide 3936 bytes of data memory available to the user. Figure 5-7 and Figure 5-8 show the data memory organization for the devices. The data memory contains Special Function Registers (SFRs) and General Purpose Registers (GPRs). The SFRs are used for control and status of the controller and peripheral functions, while GPRs are used for data storage and scratchpad operations in the user's application. Any read of an unimplemented location will read as `0's. The instruction set and architecture allow operations across all banks. The entire data memory may be accessed by Direct, Indirect or Indexed Addressing modes. Addressing modes are discussed later in this section. To ensure that commonly used registers (SFRs and select GPRs) can be accessed in a single cycle, PIC18 devices implement an Access Bank. This is a 256-byte memory space that provides fast access to SFRs and the lower portion of GPR Bank 0 without using the BSR. Section 5.3.2 "Access Bank" provides a detailed description of the Access RAM.
Large areas of data memory require an efficient addressing scheme to make rapid access to any address possible. Ideally, this means that an entire address does not need to be provided for each read or write operation. For PIC18 devices, this is accomplished with a RAM banking scheme. This divides the memory space into 16 contiguous banks of 256 bytes. Depending on the instruction, each location can be addressed directly by its full 12-bit address, or an 8-bit low-order address and a 4-bit bank pointer. Most instructions in the PIC18 instruction set make use of the bank pointer, known as the Bank Select Register (BSR). This SFR holds the 4 Most Significant bits of a location's address; the instruction itself includes the 8 Least Significant bits. Only the four lower bits of the BSR are implemented (BSR3:BSR0). The upper four bits are unused; they will always read `0' and cannot be written to. The BSR can be loaded directly by using the MOVLB instruction. The value of the BSR indicates the bank in data memory; the 8 bits in the instruction show the location in the bank and can be thought of as an offset from the bank's lower boundary. The relationship between the BSR's value and the bank division in data memory is shown in Figure 5-9. Since up to 16 registers may share the same low-order address, the user must always be careful to ensure that the proper bank is selected before performing a data read or write. For example, writing what should be program data to an 8-bit address of F9h, while the BSR is 0Fh, will end up resetting the program counter. While any bank can be selected, only those banks that are actually implemented can be read or written to. Writes to unimplemented banks are ignored, while reads from unimplemented banks will return `0's. Even so, the STATUS register will still be affected as if the operation was successful. The data memory map in Figure 5-7 indicates which banks are implemented. In the core PIC18 instruction set, only the MOVFF instruction fully specifies the 12-bit address of the source and target registers. This instruction ignores the BSR completely when it executes. All other instructions include only the low-order address as an operand and must use either the BSR or the Access Bank to locate their target registers.
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FIGURE 5-7: DATA MEMORY MAP FOR PIC18FX5J10/X5J15/X6J10 DEVICES
When a = 0:
BSR<3:0> 00h = 0000
Data Memory Map Access RAM Bank 0 FFh 00h Bank 1 FFh 00h Bank 2 FFh 00h Bank 3 FFh 00h Bank 4 FFh 00h Bank 5 FFh 00h Bank 6 FFh 00h Bank 7 FFh 00h GPR 7FFh 800h GPR 6FFh 700h GPR 5FFh 600h GPR 4FFh 500h GPR 3FFh 400h GPR 2FFh 300h GPR GPR 1FFh 200h 000h 05Fh 060h 0FFh 100h
The BSR is ignored and the Access Bank is used. The first 128 bytes are general purpose RAM (from Bank 0). The second 128 bytes are Special Function Registers (from Bank 15). When a = 1: The BSR specifies the bank used by the instruction.
= 0001
= 0010
= 0011
= 0100
= 0101
= 0110
= 0111
Access Bank 00h 5Fh Access RAM High 60h (SFRs) FFh Access RAM Low
= 1000
Bank 8
to
Unused Read as `0'
= 1110
Bank 14
= 1111 Bank 15
FFh 00h FFh
Unused SFR
EFFh F00h F5Fh F60h FFFh
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FIGURE 5-8: DATA MEMORY MAP FOR PIC18FX6J15/X7J10 DEVICES
When a = 0:
BSR<3:0> 00h = 0000
Data Memory Map Access RAM Bank 0 FFh 00h Bank 1 FFh 00h Bank 2 FFh 00h Bank 3 FFh 00h Bank 4 FFh 00h Bank 5 FFh 00h Bank 6 FFh 00h Bank 7 FFh 00h Bank 8 FFh 00h Bank 9 FFh 00h Bank 10 FFh 00h Bank 11 FFh 00h Bank 12 FFh 00h Bank 13 FFh 00h Bank 14 FFh 00h Bank 15 FFh GPR GPR DFFh E00h EFFh F00h F5Fh F60h FFFh GPR CFFh D00h GPR BFFh C00h GPR AFFh B00h GPR 9FFh A00h GPR 8FFh 900h GPR 7FFh 800h GPR 6FFh 700h GPR 5FFh 600h GPR 4FFh 500h GPR 3FFh 400h GPR 2FFh 300h GPR GPR 1FFh 200h 000h 05Fh 060h 0FFh 100h
The BSR is ignored and the Access Bank is used. The first 128 bytes are general purpose RAM (from Bank 0). The second 128 bytes are Special Function Registers (from Bank 15). When a = 1: The BSR specifies the bank used by the instruction.
= 0001
= 0010
= 0011
= 0100
= 0101
= 0110
Access Bank 00h 5Fh Access RAM High 60h (SFRs) FFh Access RAM Low
= 0111
= 1000
= 1001
= 1010
= 1011
= 1100
= 1101
= 1110
= 1111
Unused
SFR
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FIGURE 5-9:
7 0 0 0
USE OF THE BANK SELECT REGISTER (DIRECT ADDRESSING)
BSR(1) 0 0 0 1 0 0 100h Bank 1 000h
Data Memory
00h Bank 0 FFh 00h FFh 00h Bank 2 FFh 00h 7 1 1 1 1
From Opcode(2) 1 1 1 1 1 1 1 1
0 1
Bank Select(2)
200h 300h
Bank 3 through Bank 13
E00h Bank 14 F00h Bank 15 FFFh Note 1: 2:
FFh 00h FFh 00h FFh
The Access RAM bit of the instruction can be used to force an override of the selected bank (BSR<3:0>) to the registers of the Access Bank. The MOVFF instruction embeds the entire 12-bit address in the instruction.
5.3.2
ACCESS BANK
While the use of the BSR with an embedded 8-bit address allows users to address the entire range of data memory, it also means that the user must always ensure that the correct bank is selected. Otherwise, data may be read from or written to the wrong location. This can be disastrous if a GPR is the intended target of an operation, but an SFR is written to instead. Verifying and/or changing the BSR for each read or write to data memory can become very inefficient. To streamline access for the most commonly used data memory locations, the data memory is configured with an Access Bank, which allows users to access a mapped block of memory without specifying a BSR. The Access Bank consists of the first 96 bytes of memory (00h-5Fh) in Bank 0 and the last 160 bytes of memory (60h-FFh) in Block 15. The lower half is known as the "Access RAM" and is composed of GPRs. This upper half is where the device's SFRs are mapped. These two areas are mapped contiguously in the Access Bank and can be addressed in a linear fashion by an 8-bit address (Figure 5-7). The Access Bank is used by core PIC18 instructions that include the Access RAM bit (the `a' parameter in the instruction). When `a' is equal to `1', the instruction uses the BSR and the 8-bit address included in the opcode for the data memory address. When `a' is `0', however, the instruction is forced to use the Access Bank address map; the current value of the BSR is ignored entirely.
Using this "forced" addressing allows the instruction to operate on a data address in a single cycle without updating the BSR first. For 8-bit addresses of 80h and above, this means that users can evaluate and operate on SFRs more efficiently. The Access RAM below 60h is a good place for data values that the user might need to access rapidly, such as immediate computational results or common program variables. Access RAM also allows for faster and more code efficient context saving and switching of variables. The mapping of the Access Bank is slightly different when the extended instruction set is enabled (XINST configuration bit = 1). This is discussed in more detail in Section 5.6.3 "Mapping the Access Bank in Indexed Literal Offset Mode".
5.3.3
GENERAL PURPOSE REGISTER FILE
PIC18 devices may have banked memory in the GPR area. This is data RAM which is available for use by all instructions. GPRs start at the bottom of Bank 0 (address 000h) and grow upwards towards the bottom of the SFR area. GPRs are not initialized by a Power-on Reset and are unchanged on all other Resets.
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5.3.4 SPECIAL FUNCTION REGISTERS
The Special Function Registers (SFRs) are registers used by the CPU and peripheral modules for controlling the desired operation of the device. These registers are implemented as static RAM. SFRs start at the top of data memory (FFFh) and extend downward to occupy more than the top half of Bank 15 (F60h to FFFh). A list of these registers is given in Table 5-3 and Table 5-4. The SFRs can be classified into two sets: those associated with the "core" device functionality (ALU, Resets and interrupts) and those related to the peripheral functions. The Reset and interrupt registers are described in their respective chapters, while the ALU's STATUS register is described later in this section. Registers related to the operation of the peripheral features are described in the chapter for that peripheral. The SFRs are typically distributed among the peripherals whose functions they control. Unused SFR locations are unimplemented and read as `0's.
TABLE 5-3:
Address FFFh FFEh FFDh FFCh FFBh FFAh FF9h FF8h FF7h FF6h FF5h FF4h FF3h FF2h FF1h FF0h FEFh
SPECIAL FUNCTION REGISTER MAP FOR PIC18F87J10 FAMILY DEVICES
Name TOSU TOSH TOSL Address FDFh Name INDF2(1) Address FBFh FBEh FBDh FBCh FBBh FBAh FB9h FB8h FB7h FB6h FB5h FB4h FB3h FB2h FB1h FB0h FAFh FAEh FADh FACh FABh FAAh FA9h FA8h FA7h FA6h FA5h FA4h FA3h FA2h FA1h FA0h Name CCPR1H CCPR1L CCP1CON CCPR2H CCPR2L CCP2CON CCPR3H CCPR3L CCP3CON ECCP1AS CVRCON CMCON TMR3H TMR3L T3CON PSPCON SPBRG1 RCREG1 TXREG1 TXSTA1 RCSTA1 --(2) --(2) --(2) --(2) --(2) IPR3 PIR3 PIE3 IPR2 PIR2 PIE2 Address F9Fh F9Eh F9Dh F9Ch F9Bh F9Ah F99h F98h F97h F96h F95h F94h F93h F92h F91h F90h F8Fh F8Eh F8Dh F8Ch F8Bh F8Ah F89h F88h F87h F86h F85h F84h F83h F82h F81h F80h Name IPR1 PIR1 PIE1 MEMCON(3) OSCTUNE TRISJ
(3) (3)
Address F7Fh F7Eh F7Dh F7Ch F7Bh F7Ah F79h F78h F77h F76h F75h F74h F73h F72h F71h F70h F6Fh F6Eh F6Dh F6Ch F6Bh F6Ah F69h F68h F67h F66h F65h F64h F63h F62h F61h F60h
Name SPBRGH1 BAUDCON1 SPBRGH2 BAUDCON2 --(2) --(2) ECCP1DEL TMR4 PR4 T4CON CCPR4H CCPR4L CCP4CON CCPR5H CCPR5L CCP5CON SPBRG2 RCREG2 TXREG2 TXSTA2 RCSTA2 ECCP3AS ECCP3DEL ECCP2AS ECCP2DEL SSP2BUF SSP2ADD SSP2STAT SSP2CON1 SSP2CON2 --(2) --(2)
FDEh POSTINC2(1) FDDh POSTDEC2(1) FDCh FDBh FDAh FD9h FD8h FD7h FD6h FD5h FD4h FD3h FD2h FD1h FD0h FCFh
(1)
STKPTR PCLATU PCLATH PCL TBLPTRU TBLPTRH TBLPTRL TABLAT PRODH PRODL INTCON INTCON2 INTCON3 INDF0(1)
PREINC2(1) PLUSW2(1) FSR2H FSR2L STATUS TMR0H TMR0L T0CON --(2) OSCCON --(2) WDTCON RCON TMR1H TMR1L T1CON TMR2 PR2 T2CON SSP1BUF SSP1ADD SSP1STAT SSP1CON1 SSP1CON2 ADRESH ADRESL ADCON0 ADCON1 ADCON2
TRISH
TRISG TRISF TRISE TRISD TRISC TRISB TRISA LATJ(3) LATH(3) LATG LATF LATE LATD LATC LATB LATA PORTJ(3) PORTH(3) PORTG PORTF PORTE PORTD PORTC PORTB PORTA
FEEh POSTINC0 FECh FEBh FEAh FE9h FE8h FE7h FE6h FE4h FE3h FE2h FE1h FE0h Note 1: 2: 3:
FCEh FCDh FCCh FCBh FCAh FC9h FC8h FC7h FC6h FC5h FC4h FC3h FC2h FC1h FC0h
FEDh POSTDEC0(1) PREINC0(1) PLUSW0(1) FSR0H FSR0L WREG INDF1(1) POSTINC1(1)
(1)
FE5h POSTDEC1
PREINC1(1) PLUSW1(1) FSR1H FSR1L BSR
This is not a physical register. Unimplemented registers are read as `0'. This register is not available on 64-pin devices.
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TABLE 5-4:
Filename TOSU TOSH TOSL STKPTR PCLATU PCLATH PCL TBLPTRU TBLPTRH TBLPTRL TABLAT PRODH PRODL INTCON INTCON2 INTCON3 INDF0 POSTINC0 POSTDEC0 PREINC0 PLUSW0 FSR0H FSR0L WREG INDF1 POSTINC1 POSTDEC1 PREINC1 PLUSW1 FSR1H FSR1L BSR INDF2 POSTINC2 POSTDEC2 PREINC2 PLUSW2 FSR2H FSR2L STATUS Legend: Note 1: 2: 3: 4: 5:
REGISTER FILE SUMMARY (PIC18F87J10 FAMILY)
Bit 7 -- Bit 6 -- Bit 5 -- Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Value on POR, BOR ---0 0000 0000 0000 0000 0000 Return Stack Pointer Holding Register for PC<20:16> 00-0 0000 ---0 0000 0000 0000 0000 0000 bit 21 Program Memory Table Pointer Upper Byte (TBLPTR<20:16>) --00 0000 0000 0000 0000 0000 0000 0000 xxxx xxxx xxxx xxxx TMR0IE INTEDG1 INT3IE INT0IE INTEDG2 INT2IE RBIE INTEDG3 INT1IE TMR0IF TMR0IP INT3IF INT0IF INT3IP INT2IF RBIF RBIP INT1IF 0000 000x 1111 1111 1100 0000 N/A N/A N/A N/A N/A ---- xxxx xxxx xxxx xxxx xxxx N/A N/A N/A N/A N/A ---- xxxx xxxx xxxx Bank Select Register ---- 0000 N/A N/A N/A N/A N/A ---- xxxx xxxx xxxx OV Z DC C ---x xxxx Details on page: 49, 59 49, 59 49, 59 49, 60 49, 59 49, 59 49, 59 49, 82 49, 82 49, 82 49, 82 49, 97 49, 97 49, 101 49, 102 49, 103 49, 75 49, 76 49, 76 49, 76 49, 76 49, 75 49, 75 49 49, 75 49, 76 49, 76 49, 76 49, 76 49, 75 49, 75 49, 64 50, 75 50, 76 50, 76 50, 76 50, 76 50, 75 50, 75 50, 73
Top-of-Stack Upper Byte (TOS<20:16>)
Top-of-Stack High Byte (TOS<15:8>) Top-of-Stack Low Byte (TOS<7:0>) STKFUL -- STKUNF -- -- bit 21(1)
Holding Register for PC<15:8> PC Low Byte (PC<7:0>) -- --
Program Memory Table Pointer High Byte (TBLPTR<15:8>) Program Memory Table Pointer Low Byte (TBLPTR<7:0>) Program Memory Table Latch Product Register High Byte Product Register Low Byte GIE/GIEH RBPU INT2IP PEIE/GIEL INTEDG0 INT1IP
Uses contents of FSR0 to address data memory - value of FSR0 not changed (not a physical register) Uses contents of FSR0 to address data memory - value of FSR0 post-incremented (not a physical register) Uses contents of FSR0 to address data memory - value of FSR0 post-decremented (not a physical register) Uses contents of FSR0 to address data memory - value of FSR0 pre-incremented (not a physical register) Uses contents of FSR0 to address data memory - value of FSR0 pre-incremented (not a physical register) - value of FSR0 offset by W -- -- -- -- Indirect Data Memory Address Pointer 0 High
Indirect Data Memory Address Pointer 0 Low Byte Working Register Uses contents of FSR1 to address data memory - value of FSR1 not changed (not a physical register) Uses contents of FSR1 to address data memory - value of FSR1 post-incremented (not a physical register) Uses contents of FSR1 to address data memory - value of FSR1 post-decremented (not a physical register) Uses contents of FSR1 to address data memory - value of FSR1 pre-incremented (not a physical register) Uses contents of FSR1 to address data memory - value of FSR1 pre-incremented (not a physical register) - value of FSR1 offset by W -- -- -- -- Indirect Data Memory Address Pointer 1 High Byte
Indirect Data Memory Address Pointer 1 Low Byte -- -- -- --
Uses contents of FSR2 to address data memory - value of FSR2 not changed (not a physical register) Uses contents of FSR2 to address data memory - value of FSR2 post-incremented (not a physical register) Uses contents of FSR2 to address data memory - value of FSR2 post-decremented (not a physical register) Uses contents of FSR2 to address data memory - value of FSR2 pre-incremented (not a physical register) Uses contents of FSR2 to address data memory - value of FSR2 pre-incremented (not a physical register) - value of FSR2 offset by W -- -- -- -- Indirect Data Memory Address Pointer 2 High Byte
Indirect Data Memory Address Pointer 2 Low Byte -- -- -- N
x = unknown, u = unchanged, - = unimplemented, q = value depends on condition Bit 21 of the PC is only available in Serial Programming modes. These bits and/or registers are only available in 80-pin devices; otherwise, they are unimplemented and read as `0'. Reset values are shown for 80-pin devices. This register and its bits are not implemented in 64-pin devices. In 80-pin devices, the bits are unwritable and read as `0' in Microcontroller mode. The PLLEN bit is available only when either ECPLL or HSPLL Oscillator modes are selected; otherwise, the bit is read as `0'. Reset value is `0' when Two-Speed Start-up is enabled and `1' if disabled.
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TABLE 5-4:
Filename TMR0H TMR0L T0CON OSCCON WDTCON RCON TMR1H TMR1L T1CON TMR2 PR2 T2CON SSP1BUF SSP1ADD SSP1STAT SSP1CON1 SSP1CON2 ADRESH ADRESL ADCON0 ADCON1 ADCON2 CCPR1H CCPR1L CCP1CON CCPR2H CCPR2L CCP2CON CCPR3H CCPR3L CCP3CON ECCP1AS CVRCON CMCON TMR3H TMR3L T3CON PSPCON Legend: Note 1: 2: 3: 4: 5:
REGISTER FILE SUMMARY (PIC18F87J10 FAMILY) (CONTINUED)
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Value on POR, BOR 0000 0000 xxxx xxxx T0CS -- -- -- T0SE -- -- RI PSA OSTS(5) -- TO T0PS2 -- -- PD T0PS1 SCS1 -- POR T0PS0 SCS0 SWDTEN BOR 1111 1111 0--- q-00 --- ---0 0--1 1100 xxxx xxxx xxxx xxxx T1CKPS1 T1CKPS0 T1OSCEN T1SYNC TMR1CS TMR1ON 0000 0000 0000 0000 1111 1111 T2OUTPS2 T2OUTPS1 T2OUTPS0 TMR2ON T2CKPS1 T2CKPS0 -000 0000 xxxx xxxx 0000 0000 BF SSPM0 SEN 0000 0000 0000 0000 0000 0000 xxxx xxxx xxxx xxxx CHS3 VCFG1 ACQT2 CHS2 VCFG0 ACQT1 CHS1 PCFG3 ACQT0 CHS0 PCFG2 ADCS2 GO/DONE PCFG1 ADCS1 ADON PCFG0 ADCS0 0-00 0000 --00 0000 0-00 0000 xxxx xxxx xxxx xxxx CCP1M3 CCP1M2 CCP1M1 CCP1M0 0000 0000 xxxx xxxx xxxx xxxx CCP2M3 CCP2M2 CCP2M1 CCP2M0 0000 0000 xxxx xxxx xxxx xxxx CCP3M3 PSS1AC1 CVR3 CIS CCP3M2 PSS1AC0 CVR2 CM2 CCP3M1 CCP3M0 0000 0000 PSS1BD1(2) PSS1BD0(2) 0000 0000 CVR1 CM1 CVR0 CM0 0000 0000 0000 0111 xxxx xxxx xxxx xxxx T3CKPS1 IBOV T3CKPS0 PSPMODE T3CCP1 -- T3SYNC -- TMR3CS -- TMR3ON -- 0000 0000 0000 ---Details on page: 50, 143 50, 143 50, 141 32, 50 50, 273 44, 50, 113 50, 149 50, 149 50, 145 50, 152 50, 152 50, 151 50, 184, 193 50, 193 50, 184, 194 50, 185, 195 50, 196 50, 255 50, 255 50, 247 50, 248 50, 249 51, 182 51, 182 51, 167 51, 182 51, 182 51, 167 51, 182 51, 182 51, 167 51, 179 51, 263 51, 257 51, 155 51, 155 51, 153 51, 139
Timer0 Register High Byte Timer0 Register Low Byte TMR0ON IDLEN -- IPEN T08BIT -- -- --
Timer1 Register High Byte Timer1 Register Low Byte RD16 Timer2 Register Timer2 Period Register -- T2OUTPS3 T1RUN
MSSP1 Receive Buffer/Transmit Register MSSP1 Address Register (I2CTM Slave mode), MSSP1 Baud Rate Reload Register (I2C Master mode) SMP WCOL GCEN CKE SSPOV ACKSTAT D/A SSPEN ACKDT P CKP ACKEN S SSPM3 RCEN R/W SSPM2 PEN UA SSPM1 RSEN
A/D Result Register High Byte A/D Result Register Low Byte ADCAL -- ADFM -- -- --
Capture/Compare/PWM Register 1 High Byte Capture/Compare/PWM Register 1 Low Byte P1M1 P1M0 DC1B1 DC1B0
Capture/Compare/PWM Register 2 High Byte Capture/Compare/PWM Register 2 Low Byte P2M1 P2M0 DC2B1 DC2B0
Capture/Compare/PWM Register 1 High Byte Capture/Compare/PWM Register 1 Low Byte P3M1 P3M0 DC3B1 DC3B0
ECCP1ASE ECCP1AS2 ECCP1AS1 ECCP1AS0 CVREN C2OUT CVROE C1OUT CVRR C2INV CVRSS C1INV
Timer3 Register High Byte Timer3 Register Low Byte RD16 IBF T3CCP2 OBF
x = unknown, u = unchanged, - = unimplemented, q = value depends on condition Bit 21 of the PC is only available in Serial Programming modes. These bits and/or registers are only available in 80-pin devices; otherwise, they are unimplemented and read as `0'. Reset values are shown for 80-pin devices. This register and its bits are not implemented in 64-pin devices. In 80-pin devices, the bits are unwritable and read as `0' in Microcontroller mode. The PLLEN bit is available only when either ECPLL or HSPLL Oscillator modes are selected; otherwise, the bit is read as `0'. Reset value is `0' when Two-Speed Start-up is enabled and `1' if disabled.
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TABLE 5-4:
Filename SPBRG1 RCREG1 TXREG1 TXSTA1 RCSTA1 IPR3 PIR3 PIE3 IPR2 PIR2 PIE2 IPR1 PIR1 PIE1 MEMCON(3) OSCTUNE TRISJ(2) TRISH(2) TRISG TRISF TRISE TRISD TRISC TRISB TRISA LATJ(2) LATH(2) LATG LATF LATE LATD LATC LATB LATA PORTJ(2) PORTH(2) PORTG PORTF PORTE PORTD PORTC PORTB PORTA Legend: Note 1: 2: 3: 4: 5:
REGISTER FILE SUMMARY (PIC18F87J10 FAMILY) (CONTINUED)
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Value on POR, BOR 0000 0000 0000 0000 xxxx xxxx TXEN SREN RC2IP RC2IF RC2IE -- -- -- RC1IP RC1IF RC1IE WAIT1 -- TRISJ5 TRISH5 -- TRISF5 TRISE5 TRISD5 TRISC5 TRISB5 TRISA5 LATJ5 LATH5 -- LATF5 LATE5 LATD5 LATC5 LATB5 LATA5 RJ5 RH5 RJPU(2) RF5 RE5 RD5 RC5 RB5 RA5 SYNC CREN TX2IP TX2IF TX2IE -- -- -- TX1IP TX1IF TX1IE WAIT0 -- TRISJ4 TRISH4 TRISG4 TRISF4 TRISE4 TRISD4 TRISC4 TRISB4 TRISA4 LATJ4 LATH4 LATG4 LATF4 LATE4 LATD4 LATC4 LATB4 LATA4 RJ4 RH4 RG4 RF4 RE4 RD4 RC4 RB4 RA4 SENDB ADDEN TMR4IP TMR4IF TMR4IE BCL1IP BCL1IF BCL1IE SSP1IP SSP1IF SSP1IE -- -- TRISJ3 TRISH3 TRISG3 TRISF3 TRISE3 TRISD3 TRISC3 TRISB3 TRISA3 LATJ3 LATH3 LATG3 LATF3 LATE3 LATD3 LATC3 LATB3 LATA3 RJ3 RH3 RG3 RF3 RE3 RD3 RC3 RB3 RA3 BRGH FERR CCP5IP CCP5IF CCP5IE -- -- -- CCP1IP CCP1IF CCP1IE -- -- TRISJ2 TRISH2 TRISG2 TRISF2 TRISE2 TRISD2 TRISC2 TRISB2 TRISA2 LATJ2 LATH2 LATG2 LATF2 LATE2 LATD2 LATC2 LATB2 LATA2 RJ2 RH2 RG2 RF2 RE2 RD2 RC2 RB2 RA2 TRMT OERR CCP4IP CCP4IF CCP4IE TMR3IP TMR3IF TMR3IE TMR2IP TMR2IF TMR2IE WM1 -- TRISJ1 TRISH1 TRISG1 TRISF1 TRISE1 TRISD1 TRISC1 TRISB1 TRISA1 LATJ1 LATH1 LATG1 LATF1 LATE1 LATD1 LATC1 LATB1 LATA1 RJ1 RH1 RG1 RF1 RE1 RD1 RC1 RB1 RA1 TX9D RX9D CCP3IP CCP3IF CCP3IE CCP2IP CCP2IF CCP2IE TMR1IP TMR1IF TMR1IE WM0 -- TRISJ0 TRISH0 TRISG0 -- TRISE0 TRISD0 TRISC0 TRISB0 TRISA0 LATJ0 LATH0 LATG0 -- LATE0 LATD0 LATC0 LATB0 LATA0 RJ0 RH0 RG0 -- RE0 RD0 RC0 RB0 RA0 0000 0010 0000 000x 1111 1111 0000 0000 0000 0000 11-- 1-11 00-- 0-00 00-- 0-00 1111 1111 0000 0000 0000 0000 0-00 --00 -0-- ---1111 1111 1111 1111 ---1 1111 1111 1111111 1111 1111 1111 1111 1111 1111 1111 --11 1111 xxxx xxxx xxxx xxxx ---x xxxx xxxx xxxxxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx --xx xxxx xxxx xxxx 0000 xxxx 111x xxxx x000 000xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx --0x 0000 Details on page: 51, 229 51, 237, 238 51, 235, 236 51, 226 51, 227 51, 112 51, 106 51, 109 51, 111 51, 105 51, 108 51, 110 51, 104 51, 107 51, 86 29, 51 52, 137 52, 135 52, 133 52, 131 52, 129 52, 126 52, 123 52, 120 52, 117 52, 137 52, 135 52, 133 52, 131 52, 129 52, 126 52, 123 52, 120 52, 117 52, 137 52, 135 52, 133 52, 131 52, 129 52, 126 52, 123 52, 120 52, 117
EUSART1 Baud Rate Generator Register Low Byte EUSART1 Receive Register EUSART1 Transmit Register CSRC SPEN SSP2IP SSP2IF SSP2IE OSCFIP OSCFIF OSCFIE PSPIP PSPIF PSPIE EBDIS -- TRISJ7 TRISH7 -- TRISF7 TRISE7 TRISD7 TRISC7 TRISB7 -- LATJ7 LATH7 -- LATF7 LATE7 LATD7 LATC7 LATB7 -- RJ7 RH7 RDPU RF7 RE7 RD7 RC7 RB7 -- TX9 RX9 BCL2IP BCL2IF BCL2IE CMIP CMIF CMIE ADIP ADIF ADIE -- PLLEN(4) TRISJ6 TRISH6 -- TRISF6 TRISE6 TRISD6 TRISC6 TRISB6 -- LATJ6 LATH6 -- LATF6 LATE6 LATD6 LATC6 LATB6 -- RJ6 RH6 REPU RF6 RE6 RD6 RC6 RB6 --
x = unknown, u = unchanged, - = unimplemented, q = value depends on condition Bit 21 of the PC is only available in Serial Programming modes. These bits and/or registers are only available in 80-pin devices; otherwise, they are unimplemented and read as `0'. Reset values are shown for 80-pin devices. This register and its bits are not implemented in 64-pin devices. In 80-pin devices, the bits are unwritable and read as `0' in Microcontroller mode. The PLLEN bit is available only when either ECPLL or HSPLL Oscillator modes are selected; otherwise, the bit is read as `0'. Reset value is `0' when Two-Speed Start-up is enabled and `1' if disabled.
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TABLE 5-4:
Filename SPBRGH1 BAUDCON1 SPBRGH2 BAUDCON2 ECCP1DEL TMR4 PR4 T4CON CCPR4H CCPR4L CCP4CON CCPR5H CCPR5L CCP5CON SPBRG2 RCREG2 TXREG2 TXSTA2 RCSTA2 ECCP3AS ECCP3DEL ECCP2AS ECCP2DEL SSP2BUF SSP2ADD SSP2STAT SSP2CON1 SSP2CON2 Legend: Note 1: 2: 3: 4: 5:
REGISTER FILE SUMMARY (PIC18F87J10 FAMILY) (CONTINUED)
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Value on POR, BOR 0000 0000 BRG16 -- WUE ABDEN 01-0 0-00 0000 0000 BRG16 P1DC3 -- P1DC2 WUE P1DC1 ABDEN P1DC0 01-0 0-00 0000 0000 0000 0000 1111 1111 T4OUTPS2 T4OUTPS1 T4OUTPS0 TMR4ON T4CKPS1 T4CKPS0 -000 0000 xxxx xxxx xxxx xxxx CCP4M3 CCP4M2 CCP4M1 CCP4M0 --00 0000 xxxx xxxx xxxx xxxx CCP5M3 CCP5M2 CCP5M1 CCP5M0 --00 0000 0000 0000 0000 0000 0000 0000 TXEN SREN SYNC CREN SENDB ADDEN PSS3AC1 P3DC3 PSS2AC1 P2DC3 BRGH FERR PSS3AC0 P3DC2 PSS2AC0 P2DC2 TRMT OERR PSS3BD1 P3DC1 PSS2BD1 P2DC1 TX9D RX9D PSS3BD0 P3DC0 PSS2BD0 P2DC0 0000 0010 0000 000x 0000 0000 0000 0000 0000 0000 0000 0000 xxxx xxxx 0000 0000 BF SSPM0 SEN 0000 0000 0000 0000 0000 0000 Details on page: 52, 229 52, 228 52, 229 52, 228 53, 178 53, 158 53, 158 53, 157 53, 160 53, 160 53, 159 53, 160 53, 160 53, 159 53, 229 53, 237, 238 53, 235, 236 53, 226 53, 227 53, 179 53, 178 53, 179 53, 178 53, 184, 193 53, 193 53, 184, 194 53, 185, 195 53, 196
EUSART1 Baud Rate Generator Register High Byte ABDOVF RCMT -- SCKP
EUSART2 Baud Rate Generator Register High Byte ABDOVF P1RSEN Timer4 Register Timer4 Period Register -- T4OUTPS3 RCMT P1DC6 -- P1DC5 SCKP P1DC4
Capture/Compare/PWM Register 4 High Byte Capture/Compare/PWM Register 4 Low Byte -- -- DC4B1 DC4B0
Capture/Compare/PWM Register 5 High Byte Capture/Compare/PWM Register 5 Low Byte -- -- DC5B1 DC5B0
EUSART2 Baud Rate Generator Register Low Byte EUSART2 Receive Register EUSART2 Transmit Register CSRC SPEN TX9 RX9
ECCP3ASE ECCP3AS2 ECCP3AS1 ECCP3AS0 P3RSEN P3DC6 P3DC5 P3DC4
ECCP2ASE ECCP2AS2 ECCP2AS1 ECCP2AS0 P2RSEN P2DC6 P2DC5 P2DC4
MSSP2 Receive Buffer/Transmit Register MSSP2 Address Register (I2CTM Slave mode), MSSP2 Baud Rate Reload Register (I2C Master mode) SMP WCOL GCEN CKE SSPOV ACKSTAT D/A SSPEN ACKDT P CKP ACKEN S SSPM3 RCEN R/W SSPM2 PEN UA SSPM1 RSEN
x = unknown, u = unchanged, - = unimplemented, q = value depends on condition Bit 21 of the PC is only available in Serial Programming modes. These bits and/or registers are only available in 80-pin devices; otherwise, they are unimplemented and read as `0'. Reset values are shown for 80-pin devices. This register and its bits are not implemented in 64-pin devices. In 80-pin devices, the bits are unwritable and read as `0' in Microcontroller mode. The PLLEN bit is available only when either ECPLL or HSPLL Oscillator modes are selected; otherwise, the bit is read as `0'. Reset value is `0' when Two-Speed Start-up is enabled and `1' if disabled.
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5.3.5 STATUS REGISTER
The STATUS register, shown in Register 5-3, contains the arithmetic status of the ALU. The STATUS register can be the operand for any instruction, as with any other register. If the STATUS register is the destination for an instruction that affects the Z, DC, C, OV or N bits, then the write to these five bits is disabled. These bits are set or cleared according to the device logic. Therefore, the result of an instruction with the STATUS register as destination may be different than intended. For example, CLRF STATUS will set the Z bit but leave the other bits unchanged. The STATUS register then reads back as `000u u1uu'. It is recommended, therefore, that only BCF, BSF, SWAPF, MOVFF and MOVWF instructions are used to alter the STATUS register because these instructions do not affect the Z, C, DC, OV or N bits in the STATUS register. For other instructions not affecting any Status bits, see the instruction set summaries in Table 24-2 and Table 24-3. Note: The C and DC bits operate as a borrow and digit borrow bit respectively, in subtraction.
REGISTER 5-3:
STATUS REGISTER
U-0 -- bit 7 U-0 -- U-0 -- R/W-x N R/W-x OV R/W-x Z R/W-x DC R/W-x C bit 0
bit 7-5 bit 4
Unimplemented: Read as `0' N: Negative bit This bit is used for signed arithmetic (2's complement). It indicates whether the result was negative (ALU MSB = 1). 1 = Result was negative 0 = Result was positive OV: Overflow bit This bit is used for signed arithmetic (2's complement). It indicates an overflow of the 7-bit magnitude which causes the sign bit (bit 7) to change state. 1 = Overflow occurred for signed arithmetic (in this arithmetic operation) 0 = No overflow occurred Z: Zero bit 1 = The result of an arithmetic or logic operation is zero 0 = The result of an arithmetic or logic operation is not zero DC: Digit carry/borrow bit For ADDWF, ADDLW, SUBLW and SUBWF instructions: 1 = A carry-out from the 4th low-order bit of the result occurred 0 = No carry-out from the 4th low-order bit of the result Note: For borrow, the polarity is reversed. A subtraction is executed by adding the 2's complement of the second operand. For rotate (RRF, RLF) instructions, this bit is loaded with either bit 4 or bit 3 of the source register.
bit 3
bit 2
bit 1
bit 0
C: Carry/borrow bit For ADDWF, ADDLW, SUBLW and SUBWF instructions: 1 = A carry-out from the Most Significant bit of the result occurred 0 = No carry-out from the Most Significant bit of the result occurred Note: For borrow, the polarity is reversed. A subtraction is executed by adding the 2's complement of the second operand. For rotate (RRF, RLF) instructions, this bit is loaded with either the high or low-order bit of the source register.
Legend: R = Readable bit -n = Value at POR W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown
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5.4
Note:
Data Addressing Modes
The execution of some instructions in the core PIC18 instruction set are changed when the PIC18 extended instruction set is enabled. See Section 5.6 "Data Memory and the Extended Instruction Set" for more information.
Purpose Register File"), or a location in the Access Bank (Section 5.3.2 "Access Bank") as the data source for the instruction. The Access RAM bit `a' determines how the address is interpreted. When `a' is `1', the contents of the BSR (Section 5.3.1 "Bank Select Register") are used with the address to determine the complete 12-bit address of the register. When `a' is `0', the address is interpreted as being a register in the Access Bank. Addressing that uses the Access RAM is sometimes also known as Direct Forced Addressing mode. A few instructions, such as MOVFF, include the entire 12-bit address (either source or destination) in their op codes. In these cases, the BSR is ignored entirely. The destination of the operation's results is determined by the destination bit `d'. When `d' is `1', the results are stored back in the source register, overwriting its original contents. When `d' is `0', the results are stored in the W register. Instructions without the `d' argument have a destination that is implicit in the instruction; their destination is either the target register being operated on, or the W register.
While the program memory can be addressed in only one way - through the program counter - information in the data memory space can be addressed in several ways. For most instructions, the addressing mode is fixed. Other instructions may use up to three modes, depending on which operands are used and whether or not the extended instruction set is enabled. The addressing modes are: * * * * Inherent Literal Direct Indirect
An additional addressing mode, Indexed Literal Offset, is available when the extended instruction set is enabled (XINST configuration bit = 1). Its operation is discussed in greater detail in Section 5.6.1 "Indexed Addressing with Literal Offset".
5.4.3
INDIRECT ADDRESSING
5.4.1
INHERENT AND LITERAL ADDRESSING
Many PIC18 control instructions do not need any argument at all; they either perform an operation that globally affects the device, or they operate implicitly on one register. This addressing mode is known as Inherent Addressing. Examples include SLEEP, RESET and DAW. Other instructions work in a similar way, but require an additional explicit argument in the opcode. This is known as Literal Addressing mode, because they require some literal value as an argument. Examples include ADDLW and MOVLW, which respectively add or move a literal value to the W register. Other examples include CALL and GOTO, which include a 20-bit program memory address.
Indirect addressing allows the user to access a location in data memory without giving a fixed address in the instruction. This is done by using File Select Registers (FSRs) as pointers to the locations to be read or written to. Since the FSRs are themselves located in RAM as Special File Registers, they can also be directly manipulated under program control. This makes FSRs very useful in implementing data structures such as tables and arrays in data memory. The registers for indirect addressing are also implemented with Indirect File Operands (INDFs) that permit automatic manipulation of the pointer value with auto-incrementing, auto-decrementing, or offsetting with another value. This allows for efficient code using loops, such as the example of clearing an entire RAM bank in Example 5-5. It also enables users to perform indexed addressing and other stack pointer operations for program memory in data memory.
EXAMPLE 5-5: 5.4.2 DIRECT ADDRESSING
LFSR CLRF
Direct addressing specifies all or part of the source and/or destination address of the operation within the opcode itself. The options are specified by the arguments accompanying the instruction. In the core PIC18 instruction set, bit-oriented and byte-oriented instructions use some version of direct addressing by default. All of these instructions include some 8-bit literal address as their Least Significant Byte. This address specifies either a register address in one of the banks of data RAM (Section 5.3.3 "General
HOW TO CLEAR RAM (BANK 1) USING INDIRECT ADDRESSING
FSR0, 100h ; POSTINC0 ; Clear INDF ; register then ; inc pointer FSR0H, 1 ; All done with ; Bank1? NEXT ; NO, clear next ; YES, continue
NEXT
BTFSS BRA CONTINUE
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5.4.3.1 FSR Registers and the INDF Operand
At the core of indirect addressing are three sets of registers: FSR0, FSR1 and FSR2. Each represents a pair of 8-bit registers, FSRnH and FSRnL. The four upper bits of the FSRnH register are not used, so each FSR pair holds a 12-bit value. This represents a value that can address the entire range of the data memory in a linear fashion. The FSR register pairs, then, serve as pointers to data memory locations. Indirect addressing is accomplished with a set of Indirect File Operands, INDF0 through INDF2. These can be thought of as "virtual" registers: they are mapped in the SFR space but are not physically implemented. Reading or writing to a particular INDF register actually accesses its corresponding FSR register pair. A read from INDF1, for example, reads the data at the address indicated by FSR1H:FSR1L. Instructions that use the INDF registers as operands actually use the contents of their corresponding FSR as a pointer to the instruction's target. The INDF operand is just a convenient way of using the pointer. Because indirect addressing uses a full 12-bit address, data RAM banking is not necessary. Thus, the current contents of the BSR and the Access RAM bit have no effect on determining the target address.
FIGURE 5-10:
INDIRECT ADDRESSING
000h ADDWF, INDF1, 1 100h Bank 1 200h Bank 2 FSR1H:FSR1L 7 0 7 0 300h Bank 0
Using an instruction with one of the indirect addressing registers as the operand....
...uses the 12-bit address stored in the FSR pair associated with that register....
xxxx1111
11001100
Bank 3 through Bank 13
...to determine the data memory location to be used in that operation. In this case, the FSR1 pair contains FCCh. This means the contents of location FCCh will be added to that of the W register and stored back in FCCh. E00h Bank 14 F00h Bank 15 FFFh
Data Memory
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5.4.3.2 FSR Registers and POSTINC, POSTDEC, PREINC and PLUSW 5.4.3.3 Operations by FSRs on FSRs
In addition to the INDF operand, each FSR register pair also has four additional indirect operands. Like INDF, these are "virtual" registers that cannot be indirectly read or written to. Accessing these registers actually accesses the associated FSR register pair, but also performs a specific action on its stored value. They are: * POSTDEC: accesses the FSR value, then automatically decrements it by `1' afterwards * POSTINC: accesses the FSR value, then automatically increments it by `1' afterwards * PREINC: increments the FSR value by `1', then uses it in the operation * PLUSW: adds the signed value of the W register (range of -127 to 128) to that of the FSR and uses the new value in the operation In this context, accessing an INDF register uses the value in the FSR registers without changing them. Similarly, accessing a PLUSW register gives the FSR value offset by the value in the W register; neither value is actually changed in the operation. Accessing the other virtual registers changes the value of the FSR registers. Operations on the FSRs with POSTDEC, POSTINC and PREINC affect the entire register pair; that is, rollovers of the FSRnL register from FFh to 00h carry over to the FSRnH register. On the other hand, results of these operations do not change the value of any flags in the STATUS register (e.g., Z, N, OV, etc.). The PLUSW register can be used to implement a form of indexed addressing in the data memory space. By manipulating the value in the W register, users can reach addresses that are fixed offsets from pointer addresses. In some applications, this can be used to implement some powerful program control structure, such as software stacks, inside of data memory. Indirect addressing operations that target other FSRs or virtual registers represent special cases. For example, using an FSR to point to one of the virtual registers will not result in successful operations. As a specific case, assume that FSR0H:FSR0L contains FE7h, the address of INDF1. Attempts to read the value of the INDF1, using INDF0 as an operand, will return 00h. Attempts to write to INDF1, using INDF0 as the operand, will result in a NOP. On the other hand, using the virtual registers to write to an FSR pair may not occur as planned. In these cases, the value will be written to the FSR pair but without any incrementing or decrementing. Thus, writing to INDF2 or POSTDEC2 will write the same value to the FSR2H:FSR2L. Since the FSRs are physical registers mapped in the SFR space, they can be manipulated through all direct operations. Users should proceed cautiously when working on these registers, particularly if their code uses indirect addressing. Similarly, operations by indirect addressing are generally permitted on all other SFRs. Users should exercise the appropriate caution that they do not inadvertently change settings that might affect the operation of the device.
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5.5 Program Memory and the Extended Instruction Set
When using the extended instruction set, this addressing mode requires the following: * The use of the Access Bank is forced (`a' = 0); and * The file address argument is less than or equal to 5Fh. Under these conditions, the file address of the instruction is not interpreted as the lower byte of an address (used with the BSR in direct addressing) or as an 8-bit address in the Access Bank. Instead, the value is interpreted as an offset value to an address pointer specified by FSR2. The offset and the contents of FSR2 are added to obtain the target address of the operation.
The operation of program memory is unaffected by the use of the extended instruction set. Enabling the extended instruction set adds five additional two-word commands to the existing PIC18 instruction set: ADDFSR, CALLW, MOVSF, MOVSS and SUBFSR. These instructions are executed as described in Section 5.2.4 "Two-Word Instructions".
5.6
Data Memory and the Extended Instruction Set
Enabling the PIC18 extended instruction set (XINST configuration bit = 1) significantly changes certain aspects of data memory and its addressing. Specifically, the use of the Access Bank for many of the core PIC18 instructions is different; this is due to the introduction of a new addressing mode for the data memory space. This mode also alters the behavior of indirect addressing using FSR2 and its associated operands. What does not change is just as important. The size of the data memory space is unchanged, as well as its linear addressing. The SFR map remains the same. Core PIC18 instructions can still operate in both Direct and Indirect Addressing mode; inherent and literal instructions do not change at all. Indirect addressing with FSR0 and FSR1 also remain unchanged.
5.6.2
INSTRUCTIONS AFFECTED BY INDEXED LITERAL OFFSET MODE
Any of the core PIC18 instructions that can use direct addressing are potentially affected by the Indexed Literal Offset Addressing mode. This includes all byte-oriented and bit-oriented instructions, or almost one-half of the standard PIC18 instruction set. Instructions that only use Inherent or Literal Addressing modes are unaffected. Additionally, byte-oriented and bit-oriented instructions are not affected if they use the Access Bank (Access RAM bit is `1') or include a file address of 60h or above. Instructions meeting these criteria will continue to execute as before. A comparison of the different possible addressing modes when the extended instruction set is enabled is shown in Figure 5-11. Those who desire to use byte-oriented or bit-oriented instructions in the Indexed Literal Offset mode should note the changes to assembler syntax for this mode. This is described in more detail in Section 24.2.1 "Extended Instruction Syntax".
5.6.1
INDEXED ADDRESSING WITH LITERAL OFFSET
Enabling the PIC18 extended instruction set changes the behavior of indirect addressing using the FSR2 register pair and its associated file operands. Under the proper conditions, instructions that use the Access Bank - that is, most bit-oriented and byte-oriented instructions - can invoke a form of indexed addressing using an offset specified in the instruction. This special addressing mode is known as Indexed Addressing with Literal Offset, or Indexed Literal Offset mode.
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FIGURE 5-11: COMPARING ADDRESSING OPTIONS FOR BIT-ORIENTED AND BYTE-ORIENTED INSTRUCTIONS (EXTENDED INSTRUCTION SET ENABLED)
EXAMPLE INSTRUCTION: ADDWF, f, d, a (Opcode: 0010 01da ffff ffff)
When a = 0 and f 60h: The instruction executes in Direct Forced mode. `f' is interpreted as a location in the Access RAM between 060h and FFFh. This is the same as locations F60h to FFFh (Bank 15) of data memory. Locations below 060h are not available in this addressing mode.
000h 060h Bank 0 100h 00h Bank 1 through Bank 14 60h Valid range for `f' FFh Access RAM Bank 15 F40h SFRs FFFh Data Memory
F00h
When a = 0 and f 5Fh: The instruction executes in Indexed Literal Offset mode. `f' is interpreted as an offset to the address value in FSR2. The two are added together to obtain the address of the target register for the instruction. The address can be anywhere in the data memory space. Note that in this mode, the correct syntax is now: ADDWF [k], d where `k' is the same as `f'.
000h Bank 0 060h 100h Bank 1 through Bank 14 FSR2H F00h Bank 15 F40h SFRs FFFh Data Memory FSR2L 001001da ffffffff
When a = 1 (all values of f): The instruction executes in Direct mode (also known as Direct Long mode). `f' is interpreted as a location in one of the 16 banks of the data memory space. The bank is designated by the Bank Select Register (BSR). The address can be in any implemented bank in the data memory space.
000h Bank 0 060h 100h Bank 1 through Bank 14
BSR 00000000
001001da ffffffff
F00h Bank 15 F40h SFRs FFFh Data Memory
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5.6.3 MAPPING THE ACCESS BANK IN INDEXED LITERAL OFFSET MODE
The use of Indexed Literal Offset Addressing mode effectively changes how the lower part of Access RAM (00h to 5Fh) is mapped. Rather than containing just the contents of the bottom part of Bank 0, this mode maps the contents from Bank 0 and a user-defined "window" that can be located anywhere in the data memory space. The value of FSR2 establishes the lower boundary of the addresses mapped into the window, while the upper boundary is defined by FSR2 plus 95 (5Fh). Addresses in the Access RAM above 5Fh are mapped as previously described (see Section 5.3.2 "Access Bank"). An example of Access Bank remapping in this addressing mode is shown in Figure 5-12. Remapping of the Access Bank applies only to operations using the Indexed Literal Offset mode. Operations that use the BSR (Access RAM bit is `1') will continue to use direct addressing as before. Any indirect or indexed operation that explicitly uses any of the indirect file operands (including FSR2) will continue to operate as standard indirect addressing. Any instruction that uses the Access Bank, but includes a register address of greater than 05Fh, will use direct addressing and the normal Access Bank map.
5.6.4
BSR IN INDEXED LITERAL OFFSET MODE
Although the Access Bank is remapped when the extended instruction set is enabled, the operation of the BSR remains unchanged. Direct addressing, using the BSR to select the data memory bank, operates in the same manner as previously described.
FIGURE 5-12:
Example Situation:
REMAPPING THE ACCESS BANK WITH INDEXED LITERAL OFFSET ADDRESSING
000h 05Fh
ADDWF f, d, a FSR2H:FSR2L = 120h Locations in the region from the FSR2 pointer (120h) to the pointer plus 05Fh (17Fh) are mapped to the bottom of the Access RAM (000h-05Fh). Special File Registers at F60h through FFFh are mapped to 60h through FFh, as usual. Bank 0 addresses below 5Fh are not available in this mode. They can still be addressed by using the BSR.
Not Accessible Bank 0
100h 120h 17Fh 200h
Window Bank 1 Bank 1 "Window"
00h 5Fh 60h
Bank 2 through Bank 14
SFRs FFh
Access Bank
F00h Bank 15 F60h SFRs FFFh
Data Memory
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NOTES:
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6.0 PROGRAM MEMORY
For the PIC18F87J10 family of devices, the on-chip program memory is implemented as read-only memory. It is readable over the entire VDD range during normal operation; it cannot be written to or erased. Reads from program memory are executed one byte at a time. PIC18F8XJ10/8XJ15 (80-pin) devices also implement the ability to read, write to and execute code from external memory devices, using the external memory bus. In this implementation, external memory is used as an extension beyond the upper boundary of the on-chip program memory space. The operation of the physical interface is discussed in Section 7.0 "External Memory Bus". In all devices, a value written to the program memory space does not need to be a valid instruction. Executing a program memory location that forms an invalid instruction results in a NOP. The program memory space is 16 bits wide, while the data RAM space is 8 bits wide. Table reads and table writes move data between these two memory spaces through an 8-bit register (TABLAT). Table read operations retrieve data from program memory and place it into the data RAM space. Table write operations place data from the data memory space on the external data bus. The actual process of writing the data to the particular memory device is determined by the requirements of the device itself. Figure 6-1 shows the table operations as they relate to program memory and data RAM. Table operations work with byte entities. A table block containing data, rather than program instructions, is not required to be word-aligned. Therefore, a table block can start and end at any byte address. If a table write is being used to write executable code into an external program memory, program instructions will need to be word-aligned. Note: For 64-pin devices, if the TBLWT instruction is used to attempt a write to the program memory space, it will have no effect. Execution will take two instruction cycles but effectively result in a NOP. The TBLWT instruction is still available during In-Circuit Serial Programming (ICSP).
6.1
Table Reads and Table Writes
To read and write to the program memory space, there are two operations that allow the processor to move bytes between the program memory space and the data RAM: Table Read (TBLRD) and Table Write (TBLWT).
FIGURE 6-1:
TABLE READ AND TABLE WRITE OPERATIONS
Table Pointer(1) Program Memory Space Data Memory Space Table Latch (8-bit) TABLAT
Instruction: TBLRD*
TBLPTRU TBLPTRH TBLPTRL
Instruction: TBLWT* Table Pointer(1) TBLPTRU TBLPTRH TBLPTRL
Program Memory Space
Data Memory Space Table Latch (8-bit)(2) TABLAT
Note 1: 2:
Table Pointer register points to a byte in the program memory space. Data is actually written to the memory location by the memory write algorithm. See Section 6.4 "Writing to Program Memory Space (PIC18F8XJ10/8XJ15 Devices Only)" for more information.
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6.2 Control Registers
TABLE 6-1:
Two control registers are used in conjunction with the TBLRD and TBLWT instructions: the TABLAT register and the TBLPTR register set.
TABLE POINTER OPERATIONS WITH TBLRD AND TBLWT INSTRUCTIONS
Operation on Table Pointer TBLPTR is not modified TBLPTR is incremented after the read/write TBLPTR is decremented after the read/write TBLPTR is incremented before the read/write
Example TBLRD* TBLWT* TBLRD*+ TBLWT*+ TBLRD*TBLWT*TBLRD+* TBLWT+*
6.2.1
TABLE LATCH REGISTER (TABLAT)
The Table Latch (TABLAT) is an 8-bit register mapped into the SFR space. The Table Latch register is used to hold 8-bit data during data transfers between the program memory space and data RAM.
6.2.2
TABLE POINTER REGISTER (TBLPTR)
The Table Pointer register (TBLPTR) addresses a byte within the program memory. It is comprised of three SFR registers: Table Pointer Upper Byte, Table Pointer High Byte and Table Pointer Low Byte (TBLPTRU:TBLPTRH:TBLPTRL). Only the lower six bits of TBLPTRU are used with TBLPTRH and TBLPTRL, to form a 22-bit wide pointer. The contents of TBLPTR indicate a location in program memory space. The low-order 21 bits allow the device to address the full 2 Mbytes of program memory space. The 22nd bit allows access to the configuration space, including the device ID, user ID locations and the configuration bits. The TBLPTR register set is updated when executing a TBLRD or TBLWT operation in one of four ways, based on the instruction's arguments. These are detailed in Table 6-1. These operations on the TBLPTR only affect the low-order 21 bits. When a TBLRD or TBLWT is executed, all 22 bits of the TBLPTR determine which address in the program memory space is to be read or written to.
6.3
Reading the Flash Program Memory
The TBLRD instruction is used to retrieve data from the program memory space and places it into data RAM. Table reads from program memory are performed one byte at a time. TBLPTR points to a byte address in program space. Executing TBLRD places the byte pointed to into TABLAT. The internal program memory is typically organized by words. The Least Significant bit of the address selects between the high and low bytes of the word. Figure 6-2 shows the interface between the internal program memory and the TABLAT. A typical method for reading data from program memory is shown in Example 6-1.
FIGURE 6-2:
READS FROM PROGRAM MEMORY
Program Memory Space
(Even Byte Address) (Odd Byte Address)
TBLPTR = xxxxx1 Instruction Register (IR)
TBLPTR = xxxxx0 TABLAT Read Register
FETCH
TBLRD
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EXAMPLE 6-1:
MOVLW MOVWF MOVLW MOVWF MOVLW MOVWF READ_WORD TBLRD*+ MOVF MOVWF TBLRD*+ MOVFW MOVF TABLAT, W WORD_EVEN TABLAT, W WORD_ODD ; read into TABLAT and increment ; get data ; read into TABLAT and increment ; get data
READING A FLASH PROGRAM MEMORY WORD
CODE_ADDR_UPPER TBLPTRU CODE_ADDR_HIGH TBLPTRH CODE_ADDR_LOW TBLPTRL ; Load TBLPTR with the base ; address of the word
6.4
Writing to Program Memory Space (PIC18F8XJ10/8XJ15 Devices Only)
The table write operation outputs the contents of the TBLPTR and TABLAT registers to the external address and data busses of the external memory interface. Depending on the program memory mode selected, the operation may target any byte address in the device's memory space. What happens to this data depends largely on the external memory device being used. For PIC18 devices with Enhanced Flash memory, a single algorithm is used for writing to the on-chip program array. In the case of external devices, however, the algorithm is determined by the type of memory device and its requirements. In some cases, a specific instruction sequence must be sent before data can be written or erased. Address and data demultiplexing, chip select operation and write time requirements must all be considered in creating the appropriate code. The connection of the data and address busses to the memory device are dictated by the interface being used, the data bus width and the target device. When using a 16-bit data path, the algorithm must take into account the width of the target memory. Another important consideration is the write time requirement of the target device. If this is longer than the time that a TBLWT operation makes data available on the interface, the algorithm must be adjusted to lengthen this time. It may be possible, for example, to buy enough time by increasing the length of the wait state on table operations. In all cases, it is important to remember that instructions in the program memory space are word-aligned, with the Least Significant bit always being written to an even-numbered address (LSb = 0). If data is being stored in the program memory space, word alignment of the data is not required.
A complete overview of interface algorithms is beyond the scope of this data sheet. The best place for timing and instruction sequence requirements is the data sheet of the memory device in question. For additional information algorithm design for the external memory interface, refer to Microchip application note AN869, "External Memory Interfacing Techniques for the PIC18F8XXX" (DS00869).
6.4.1
WRITE VERIFY
Depending on the application, good programming practice may dictate that the value written to the memory should be verified against the original value. This should be used in applications where excessive writes can stress bits near the specification limit.
6.4.2
UNEXPECTED TERMINATION OF WRITE OPERATION
If a write is terminated by an unplanned event, such as loss of power or an unexpected Reset, the memory location just programmed should be verified and reprogrammed if needed. If the application writes to external memory on a frequent basis, it may be necessary to implement an error trapping routine to handle these unplanned events.
6.5
Erasing External Memory (PIC18F8XJ10/8XJ15 Devices Only)
Erasure is implemented in different ways on different devices. In many cases, it is possible to erase all or part of the memory by issuing a specific command. In some devices, it may be necessary to write `0's to the locations to be erased. For specific information, consult the data sheet for the memory device in question.
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6.6 Writing and Erasing On-Chip Program Memory (ICSP Mode) 6.7 Flash Program Operation During Code Protection
While the on-chip program memory is read-only in normal operating mode, it can be written to and erased as a function of In-Circuit Serial Programming (ICSP). In this mode, the TBLWT operation is used in all devices to write to blocks of 64 bytes (32 words) at one time. Write blocks are boundary-aligned with the code protection blocks. Special commands are used to erase one or more code blocks of the program memory, or the entire device.
See Section 23.6 "Program Verification and Code Protection" for details on code protection of Flash program memory.
TABLE 6-2:
Name TBLPTRU TBLPTRL TABLAT
REGISTERS ASSOCIATED WITH FLASH PROGRAM MEMORY
Bit 7 -- Bit 6 -- Bit 5 bit 21 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Reset Values on Page 49 49 49 49
Program Memory Table Pointer Upper Byte (TBLPTR<20:16>)
TBPLTRH Program Memory Table Pointer High Byte (TBLPTR<15:8>) Program Memory Table Pointer Low Byte (TBLPTR<7:0>) Program Memory Table Latch
Legend: -- = unimplemented, read as `0'. Shaded cells are not used during program memory access.
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7.0
Note:
EXTERNAL MEMORY BUS
The external memory bus implemented on 64-pin devices. is not
The external memory bus allows the device to access external memory devices (such as Flash, EPROM, SRAM, etc.) as program or data memory. It supports both 8 and 16-bit Data Width modes and three address widths of up to 20 bits.
The bus is implemented with 28 pins, multiplexed across four I/O ports. Three ports (PORTD, PORTE and PORTH) are multiplexed with the address/data bus for a total of 20 available lines, while PORTJ is multiplexed with the bus control signals. A list of the pins and their functions is provided in Table 7-1.
TABLE 7-1:
Name RD0/AD0 RD1/AD1 RD2/AD2 RD3/AD3 RD4/AD4 RD5/AD5 RD6/AD6 RD7/AD7 RE0/AD8 RE1/AD9 RE2/AD10 RE3/AD11 RE4/AD12 RE5/AD13 RE6/AD14 RE7/AD15 RH0/A16 RH1/A17 RH2/A18 RH3/A19 RJ0/ALE RJ1/OE RJ2/WRL RJ3/WRH RJ4/BA0 RJ5/CE RJ6/LB RJ7/UB Note:
PIC18F8XJ10/8XJ15 EXTERNAL BUS - I/O PORT FUNCTIONS
Port PORTD PORTD PORTD PORTD PORTD PORTD PORTD PORTD PORTE PORTE PORTE PORTE PORTE PORTE PORTE PORTE PORTH PORTH PORTH PORTH PORTJ PORTJ PORTJ PORTJ PORTJ PORTJ PORTJ PORTJ Bit 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 0 1 2 3 4 5 6 7 External Memory Bus Function Address bit 0 or Data bit 0 Address bit 1 or Data bit 1 Address bit 2 or Data bit 2 Address bit 3 or Data bit 3 Address bit 4 or Data bit 4 Address bit 5 or Data bit 5 Address bit 6 or Data bit 6 Address bit 7 or Data bit 7 Address bit 8 or Data bit 8 Address bit 9 or Data bit 9 Address bit 10 or Data bit 10 Address bit 11 or Data bit 11 Address bit 12 or Data bit 12 Address bit 13 or Data bit 13 Address bit 14 or Data bit 14 Address bit 15 or Data bit 15 Address bit 16 Address bit 17 Address bit 18 Address bit 19 Address Latch Enable (ALE) Control pin Output Enable (OE) Control pin Write Low (WRL) Control pin Write High (WRH) Control pin Byte Address bit 0 (BA0) Chip Enable (CE) Control pin Lower Byte Enable (LB) Control pin Upper Byte Enable (UB) Control pin
For the sake of clarity, only I/O port and external bus assignments are shown here. One or more additional multiplexed features may be available on some pins.
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7.1 External Memory Bus Control
The operation of the interface is controlled by the MEMCON register (Register 7-1). This register is available in all program memory operating modes except Microcontroller mode. In this mode, the register is disabled and cannot be written to. The EBDIS bit (MEMCON<7>) controls the operation of the bus and related port functions. Clearing EBDIS enables the interface and disables the I/O functions of the ports, as well as any other functions multiplexed to those pins. Setting the bit enables the I/O ports and other functions, but allows the interface to override everything else on the pins when an external memory operation is required. By default, the external bus is always enabled and disables all other I/O. The operation of the EBDIS bit is also influenced by the program memory mode being used. This is discussed in more detail in Section 7.5 "Program Memory Modes and the External Memory Bus". The WAIT bits allow for the addition of wait states to external memory operations. The use of these bits is discussed in Section 7.3 "Wait States". The WM bits select the particular operating mode used when the bus is operating in 16-bit Data Width mode. These are discussed in more detail in Section 7.6 "16-bit Data Width Modes". These bits have no effect when an 8-bit Data Width mode is selected.
REGISTER 7-1:
MEMCON: EXTERNAL MEMORY BUS CONTROL REGISTER
R/W-0 EBDIS bit7 U-0 -- R/W-0 WAIT1 R/W-0 WAIT0 U-0 -- U-0 -- R/W-0 WM1 R/W-0 WM0 bit0
bit 7
EBDIS: External Bus Disable bit 1 = External bus enabled when microcontroller accesses external memory; otherwise, all external bus drivers are mapped as I/O ports 0 = External bus always enabled, I/O ports are disabled Unimplemented: Read as `0' WAIT1:WAIT0: Table Reads and Writes Bus Cycle Wait Count bits 11 = Table reads and writes will wait 0 TCY 10 = Table reads and writes will wait 1 TCY 01 = Table reads and writes will wait 2 TCY 00 = Table reads and writes will wait 3 TCY Unimplemented: Read as `0' WM1:WM0: TBLWT Operation with 16-bit Data Bus Width Select bits 1x = Word Write mode: TABLAT0 and TABLAT1 word output, WRH active when TABLAT1 written 01 = Byte Select mode: TABLAT data copied on both MSB and LSB, WRH and (UB or LB) will activate 00 = Byte Write mode: TABLAT data copied on both MSB and LSB, WRH or WRL will activate Legend: R = Readable bit -n = Value at POR W = Writable bit '1' = Bit is set U = Unimplemented bit, read as `0' '0' = Bit is cleared x = Bit is unknown
bit 6 bit 5-4
bit 3-2 bit 1-0
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7.2 Address and Data Width
7.2.1
The PIC18F87J10 family of devices can be independently configured for different address and data widths on the same memory bus. Both address and data width are set by configuration bits in the CONFIG3L register. As configuration bits, this means that these options can only be configured by programming the device and are not controllable in software. The BW bit selects an 8-bit or 16-bit data bus width. Setting this bit (default) selects a data width of 16 bits. The EMB1:EMB0 bits determine both the program memory operating mode and the address bus width. The available options are 20-bit (default), 16-bit and 12-bit, as well as Microcontroller mode (external bus disabled). Selecting a 16-bit or 12-bit width makes a corresponding number of high-order lines available for I/O functions; these pins are no longer affected by the setting of the EBDIS bit. For example, selecting a 16-bit Address mode (EMB1:EMB0 = 10) disables A19:A16 and allows PORTH<3:0> to function without interruptions from the bus. Using the smaller address widths allows users to tailor the memory bus to the size of the external memory space for a particular design while freeing up pins for dedicated I/O operation. Because the EMB bits have the effect of disabling pins for memory bus operations, it is important to always select an address width at least equal to the data width. If a 12-bit address width is used with a 16-bit data width, the upper four bits of data will not be available on the bus. All combinations of address and data widths require multiplexing of address and data information on the same lines. The address and data multiplexing, as well as I/O ports made available by the use of smaller address widths, are summarized in Table 7-2.
ADDRESS SHIFTING ON THE EXTERNAL BUS
By default, the address presented on the external bus is the value of the PC. In practical terms, this means that addresses in the external memory device below the top of on-chip memory are unavailable to the microcontroller. To access these physical locations, the glue logic between the microcontroller and the external memory must somehow translate addresses. To simplify the interface, the external bus offers an extension of Extended Microcontroller mode that automatically performs address shifting. This feature is controlled by the EASHFT configuration bit. Setting this bit offsets addresses on the bus by the size of the microcontroller's on-chip program memory and sets the bottom address at 0000h. This allows the device to use the entire range of physical addresses of the external memory.
7.2.2
21-BIT ADDRESSING
As an extension of 20-bit address width operation, the external memory bus can also fully address a 2-Mbyte memory space. This is done by using the Bus Address Bit 0 (BA0) control line as the Least Significant bit of the address. The UB and LB control signals may also be used with certain memory devices to select the upper and lower bytes within a 16-bit wide data word. This addressing mode is available in both 8-bit and certain 16-bit data width modes. Additional details are provided in Section 7.6.3 "16-Bit Byte Select Mode" and Section 7.7 "8-bit Mode".
TABLE 7-2:
Data Width
ADDRESS AND DATA LINES FOR DIFFERENT ADDRESS AND DATA WIDTHS
Address Width Multiplexed Data and Address Lines (and Corresponding Ports) Address-Only Lines (and Corresponding Ports) AD11:AD8 (PORTE<3:0>) AD7:AD0 (PORTD<7:0>) AD15:AD8 (PORTE<7:0>) A19:A16, AD15:AD8 (PORTH<3:0>, PORTE<7:0>) AD15:AD0 (PORTD<7:0>, PORTE<7:0>) -- A19:A16 (PORTH<3:0>) Ports Available for I/O PORTE<7:4>, All of PORTH All of PORTH -- All of PORTH --
12-bit 8-bit 16-bit 20-bit 16-bit 16-bit 20-bit
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7.3 Wait States
While it may be assumed that external memory devices will operate at the microcontroller clock rate, this is often not the case. In fact, many devices require longer times to write or retrieve data than the time allowed by the execution of table read or table write operations. To compensate for this, the external memory bus can be configured to add a fixed delay to each table operation using the bus. Wait states are enabled by setting the WAIT configuration bit. When enabled, the amount of delay is set by the WAIT1:WAIT0 bits (MEMCON<5:4>). The delay is based on multiples of microcontroller instruction cycle time and are added following the instruction cycle when the table operation is executed. The range is from no delay to 3 TCY (default value). If the device fetches or accesses external memory while EBDIS = 1, the pins will switch to external bus. If the EBDIS bit is set by a program executing from external memory, the action of setting the bit will be delayed until the program branches into the internal memory. At that time, the pins will change from external bus to I/O ports. If the device is executing out of internal memory when EBDIS = 0, the memory bus address/data and control pins will not be active. They will go to a state where the active address/data pins are tri-state; the CE, OE, WRH, WRL, UB and LB signals are `1' and ALE and BA0 are `0'. Note that only those pins associated with the current address width are forced to tri-state; the other pins continue to function as I/O. In the case of 16-bit address width, for example, only AD<15:0> (PORTD and PORTE) are affected; A19:A16 (PORTH<3:0>) continue to function as I/O. In all external memory modes, the bus takes priority over any other peripherals that may share pins with it. This includes the Parallel Slave Port and serial communications modules which would otherwise take priority over the I/O port.
7.4
Port Pin Weak Pull-ups
With the exception of the upper address lines, A19:A16, the pins associated with the external memory bus are equipped with weak pull-ups. The pull-ups are controlled by the upper three bits of the PORTG register. They are named RDPU, REPU and RJPU and control pull-ups on PORTD, PORTE and PORTJ, respectively. Setting one of these bits enables the corresponding pull-ups for that port. All pull-ups are disabled by default on all device Resets.
7.6
16-bit Data Width Modes
In 16-bit Data Width mode, the external memory interface can be connected to external memories in three different configurations: * 16-bit Byte Write * 16-bit Word Write * 16-bit Byte Select The configuration to be used is determined by the WM1:WM0 bits in the MEMCON register (MEMCON<1:0>). These three different configurations allow the designer maximum flexibility in using both 8-bit and 16-bit devices with 16-bit data. For all 16-bit modes, the Address Latch Enable (ALE) pin indicates that the address bits AD<15:0> are available on the external memory interface bus. Following the address latch, the Output Enable signal (OE) will enable both bytes of program memory at once to form a 16-bit instruction word. The Chip Enable signal (CE) is active at any time that the microcontroller accesses external memory, whether reading or writing; it is inactive (asserted high) whenever the device is in Sleep mode. In Byte Select mode, JEDEC standard Flash memories will require BA0 for the byte address line and one I/O line to select between Byte and Word mode. The other 16-bit modes do not need BA0. JEDEC standard static RAM memories will use the UB or LB signals for byte selection.
7.5
Program Memory Modes and the External Memory Bus
The PIC18F87J10 family of devices are capable of operating in one of two program memory modes, using combinations of on-chip and external program memory. The functions of the multiplexed port pins depend on the program memory mode selected, as well as the setting of the EBDIS bit. In Microcontroller Mode, the bus is not active and the pins have their port functions only. Writes to the MEMCOM register are not permitted. The Reset value of EBDIS (`0') is ignored and EMB pins behave as I/O ports. In Extended Microcontroller Mode, the external program memory bus shares I/O port functions on the pins. When the device is fetching or doing table read/table write operations on the external program memory space, the pins will have the external bus function. If the device is fetching and accessing internal program memory locations only, the EBDIS control bit will change the pins from external memory to I/O port functions. When EBDIS = 0, the pins function as the external bus. When EBDIS = 1, the pins function as I/O ports.
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7.6.1 16-BIT BYTE WRITE MODE
Figure 7-1 shows an example of 16-bit Byte Write mode for PIC18F87J10 family devices. This mode is used for two separate 8-bit memories connected for 16-bit operation. This generally includes basic EPROM and Flash devices. It allows table writes to byte-wide external memories. During a TBLWT instruction cycle, the TABLAT data is presented on the upper and lower bytes of the AD15:AD0 bus. The appropriate WRH or WRL control line is strobed on the LSb of the TBLPTR.
FIGURE 7-1:
16-BIT BYTE WRITE MODE EXAMPLE
D<7:0> (MSB) 373 A<19:0> D<15:8> A D<7:0> CE WR(2) D<7:0>
PIC18F8XJ10 AD<7:0>
(LSB) A D<7:0> CE OE WR(2)
AD<15:8> ALE A<19:16>(1) CE OE WRH WRL
373
OE
Address Bus Data Bus Control Lines Note 1: 2: Upper order address lines are used only for 20-bit address widths. This signal only applies to table writes. See Section 6.1 "Table Reads and Table Writes".
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7.6.2 16-BIT WORD WRITE MODE
Figure 7-2 shows an example of 16-bit Word Write mode for PIC18F65J10 devices. This mode is used for word-wide memories which include some of the EPROM and Flash-type memories. This mode allows opcode fetches and table reads from all forms of 16-bit memory and table writes to any type of word-wide external memories. This method makes a distinction between TBLWT cycles to even or odd addresses. During a TBLWT cycle to an even address (TBLPTR<0> = 0), the TABLAT data is transferred to a holding latch and the external address data bus is tri-stated for the data portion of the bus cycle. No write signals are activated. During a TBLWT cycle to an odd address (TBLPTR<0> = 1), the TABLAT data is presented on the upper byte of the AD15:AD0 bus. The contents of the holding latch are presented on the lower byte of the AD15:AD0 bus. The WRH signal is strobed for each write cycle; the WRL pin is unused. The signal on the BA0 pin indicates the LSb of the TBLPTR, but it is left unconnected. Instead, the UB and LB signals are active to select both bytes. The obvious limitation to this method is that the table write must be done in pairs on a specific word boundary to correctly write a word location.
FIGURE 7-2:
16-BIT WORD WRITE MODE EXAMPLE
PIC18F8XJ10 AD<7:0>
373
A<20:1> D<15:0>
A
JEDEC Word EPROM Memory
D<15:0> CE OE WR(2)
AD<15:8> 373 ALE A<19:16>(1) CE OE WRH
Address Bus Data Bus Control Lines Note 1: 2: Upper order address lines are used only for 20-bit address widths. This signal only applies to table writes. See Section 6.1 "Table Reads and Table Writes".
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7.6.3 16-BIT BYTE SELECT MODE
Figure 7-3 shows an example of 16-bit Byte Select mode. This mode allows table write operations to word-wide external memories with byte selection capability. This generally includes both word-wide Flash and SRAM devices. During a TBLWT cycle, the TABLAT data is presented on the upper and lower byte of the AD15:AD0 bus. The WRH signal is strobed for each write cycle; the WRL pin is not used. The BA0 or UB/LB signals are used to select the byte to be written, based on the Least Significant bit of the TBLPTR register. Flash and SRAM devices use different control signal combinations to implement Byte Select mode. JEDEC standard Flash memories require that a controller I/O port pin be connected to the memory's BYTE/WORD pin to provide the select signal. They also use the BA0 signal from the controller as a byte address. JEDEC standard static RAM memories, on the other hand, use the UB or LB signals to select the byte.
FIGURE 7-3:
16-BIT BYTE SELECT MODE EXAMPLE
PIC18F8XJ10 AD<7:0>
373
A<20:1> A
JEDEC Word FLASH Memory D<15:0> D<15:0>
AD<15:8> 373 ALE A<19:16>(2) OE WRH WRL BA0 I/O
138(3)
CE A0 BYTE/WORD OE WR(1)
A<20:1>
A
JEDEC Word SRAM Memory D<15:0>
CE LB UB LB UB OE
D<15:0> WR(1)
Address Bus Data Bus Control Lines Note 1: 2: 3: This signal only applies to table writes. See Section 6.1 "Table Reads and Table Writes". Upper order address lines are used only for 20-bit address width. Demultiplexing is only required when multiple memory devices are accessed.
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7.6.4 16-BIT MODE TIMING
The presentation of control signals on the external memory bus is different for the various operating modes. Typical signal timing diagrams are shown in Figure 7-4 and Figure 7-5.
FIGURE 7-4:
EXTERNAL MEMORY BUS TIMING FOR TBLRD (EXTENDED MICROCONTROLLER MODE)
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
A<19:16> AD<15:0> CE ALE OE Memory Cycle Instruction Execution Opcode Fetch TBLRD * from 000100h INST(PC - 2) Opcode Fetch MOVLW 55h from 000102h TBLRD Cycle 1 CF33h
0Ch 9256h
TBLRD 92h from 199E67h
Opcode Fetch ADDLW 55h from 000104h MOVLW
TBLRD Cycle 2
FIGURE 7-5:
EXTERNAL MEMORY BUS TIMING FOR SLEEP (EXTENDED MICROCONTROLLER MODE)
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1
A<19:16> AD<15:0> CE ALE OE Memory Cycle
00h
00h
3AAAh
0003h
3AABh
0E55h
Opcode Fetch SLEEP from 007554h INST(PC - 2)
Opcode Fetch MOVLW 55h from 007556h SLEEP
Sleep Mode, Bus Inactive
Instruction Execution
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7.7 8-bit Mode
In 8-bit Data Width mode, the external memory bus operates only in Multiplexed mode; that is, data shares the 8 Least Significant bits of the address bus. Figure 7-6 shows an example of 8-bit Multiplexed mode for 80-pin devices. This mode is used for a single 8-bit memory connected for 16-bit operation. The instructions will be fetched as two 8-bit bytes on a shared data/address bus. The two bytes are sequentially fetched within one instruction cycle (TCY). Therefore, the designer must choose external memory devices according to timing calculations based on 1/2 TCY (2 times the instruction rate). For proper memory speed selection, glue logic propagation delay times must be considered, along with setup and hold times. The Address Latch Enable (ALE) pin indicates that the address bits AD<15:0> are available on the external memory interface bus. The Output Enable signal (OE) will enable one byte of program memory for a portion of the instruction cycle, then BA0 will change and the second byte will be enabled to form the 16-bit instruction word. The Least Significant bit of the address, BA0, must be connected to the memory devices in this mode. The Chip Enable signal (CE) is active at any time that the microcontroller accesses external memory, whether reading or writing; it is inactive (asserted high) whenever the device is in Sleep mode. This generally includes basic EPROM and Flash devices. It allows table writes to byte-wide external memories. During a TBLWT instruction cycle, the TABLAT data is presented on the upper and lower bytes of the AD15:AD0 bus. The appropriate level of the BA0 control line is strobed on the LSb of the TBLPTR.
FIGURE 7-6:
8-BIT MULTIPLEXED MODE EXAMPLE
D<7:0>
PIC18F8XJ10 AD<7:0> ALE AD<15:8>(1) A<19:16>(1) BA0 CE OE WRL
373
A<19:0> D<15:8>
A A0 D<7:0> CE OE WR(2)
Address Bus Data Bus Control Lines
Note 1: 2:
Upper order address bits are only used 20-bit address width. The upper AD byte is used for all address widths except 8-bit. This signal only applies to table writes. See Section 6.1 "Table Reads and Table Writes".
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7.7.1 8-BIT MODE TIMING
The presentation of control signals on the external memory bus is different for the various operating modes. Typical signal timing diagrams are shown in Figure 7-7 and Figure 7-8.
FIGURE 7-7:
EXTERNAL MEMORY BUS TIMING FOR TBLRD (EXTENDED MICROCONTROLLER MODE)
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
A<19:16> AD<15:8> AD<7:0> CE ALE OE Memory Cycle Instruction Execution Opcode Fetch TBLRD * from 000100h INST(PC - 2) Opcode Fetch MOVLW 55h from 000102h TBLRD Cycle 1 33h
0Ch CFh 92h
TBLRD 92h from 199E67h TBLRD Cycle 2
Opcode Fetch ADDLW 55h from 000104h MOVLW
FIGURE 7-8:
EXTERNAL MEMORY BUS TIMING FOR SLEEP (EXTENDED MICROCONTROLLER MODE)
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1
A<19:16> AD<15:8> AD<7:0> AAh
00h
00h
3Ah 00h 03h ABh
3Ah 0Eh 55h
BA0 CE ALE OE Memory Cycle
Opcode Fetch SLEEP from 007554h INST(PC - 2)
Opcode Fetch MOVLW 55h from 007556h SLEEP
Sleep Mode, Bus Inactive
Instruction Execution
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7.8 Operation in Power-Managed Modes
In alternate power-managed Run modes, the external bus continues to operate normally. If a clock source with a lower speed is selected, bus operations will run at that speed. In these cases, excessive access times for the external memory may result if wait states have been enabled and added to external memory operations. If operations in a lower power Run mode are anticipated, users should provide in their applications for adjusting memory access times at the lower clock speeds. In Sleep and Idle modes, the microcontroller core does not need to access data; bus operations are suspended. The state of the external bus is frozen, with the address/data pins and most of the control pins holding at the same state they were in when the mode was invoked. The only potential changes are the CE, LB and UB pins, which are held at logic high.
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NOTES:
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8.0
8.1
8 x 8 HARDWARE MULTIPLIER
Introduction
EXAMPLE 8-1:
MOVF MULWF ARG1, W ARG2
8 x 8 UNSIGNED MULTIPLY ROUTINE
; ; ARG1 * ARG2 -> ; PRODH:PRODL
All PIC18 devices include an 8 x 8 hardware multiplier as part of the ALU. The multiplier performs an unsigned operation and yields a 16-bit result that is stored in the product register pair, PRODH:PRODL. The multiplier's operation does not affect any flags in the STATUS register. Making multiplication a hardware operation allows it to be completed in a single instruction cycle. This has the advantages of higher computational throughput and reduced code size for multiplication algorithms and allows the PIC18 devices to be used in many applications previously reserved for digital signal processors. A comparison of various hardware and software multiply operations, along with the savings in memory and execution time, is shown in Table 8-1.
EXAMPLE 8-2:
MOVF MULWF BTFSC SUBWF MOVF BTFSC SUBWF ARG1, W ARG2 ARG2, SB PRODH, F ARG2, W ARG1, SB PRODH, F
8 x 8 SIGNED MULTIPLY ROUTINE
; ; ; ; ; ARG1 * ARG2 -> PRODH:PRODL Test Sign Bit PRODH = PRODH - ARG1
; Test Sign Bit ; PRODH = PRODH ; - ARG2
8.2
Operation
Example 8-1 shows the instruction sequence for an 8 x 8 unsigned multiplication. Only one instruction is required when one of the arguments is already loaded in the WREG register. Example 8-2 shows the sequence to do an 8 x 8 signed multiplication. To account for the sign bits of the arguments, each argument's Most Significant bit (MSb) is tested and the appropriate subtractions are done.
TABLE 8-1:
Routine
PERFORMANCE COMPARISON FOR VARIOUS MULTIPLY OPERATIONS
Multiply Method Without hardware multiply Hardware multiply Without hardware multiply Hardware multiply Without hardware multiply Hardware multiply Without hardware multiply Hardware multiply Program Memory (Words) 13 1 33 6 21 28 52 35 Cycles (Max) 69 1 91 6 242 28 254 40 Time @ 40 MHz 6.9 s 100 ns 9.1 s 600 ns 24.2 s 2.8 s 25.4 s 4.0 s @ 10 MHz 27.6 s 400 ns 36.4 s 2.4 s 96.8 s 11.2 s 102.6 s 16.0 s @ 4 MHz 69 s 1 s 91 s 6 s 242 s 28 s 254 s 40 s
8 x 8 unsigned 8 x 8 signed 16 x 16 unsigned 16 x 16 signed
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Example 8-3 shows the sequence to do a 16 x 16 unsigned multiplication. Equation 8-1 shows the algorithm that is used. The 32-bit result is stored in four registers (RES3:RES0).
EQUATION 8-2:
16 x 16 SIGNED MULTIPLICATION ALGORITHM
EQUATION 8-1:
16 x 16 UNSIGNED MULTIPLICATION ALGORITHM
ARG1H:ARG1L * ARG2H:ARG2L (ARG1H * ARG2H * 216) + (ARG1H * ARG2L * 28) + (ARG1L * ARG2H * 28) + (ARG1L * ARG2L)
RES3:RES0
= =
RES3:RES0 = ARG1H:ARG1L * ARG2H:ARG2L = (ARG1H * ARG2H * 216) + (ARG1H * ARG2L * 28) + (ARG1L * ARG2H * 28) + (ARG1L * ARG2L) + (-1 * ARG2H<7> * ARG1H:ARG1L * 216) + (-1 * ARG1H<7> * ARG2H:ARG2L * 216)
EXAMPLE 8-4:
MOVF MULWF MOVFF MOVFF ; MOVF MULWF MOVFF MOVFF ; MOVF MULWF MOVF ADDWF MOVF ADDWFC CLRF ADDWFC ; MOVF MULWF MOVF ADDWF MOVF ADDWFC CLRF ADDWFC ; BTFSS BRA MOVF SUBWF MOVF SUBWFB ; SIGN_ARG1 BTFSS BRA MOVF SUBWF MOVF SUBWFB ; CONT_CODE :
16 x 16 SIGNED MULTIPLY ROUTINE
; ARG1L * ARG2L -> ; PRODH:PRODL ; ;
EXAMPLE 8-3:
MOVF MULWF MOVFF MOVFF ; MOVF MULWF MOVFF MOVFF ; MOVF MULWF MOVF ADDWF MOVF ADDWFC CLRF ADDWFC ; MOVF MULWF MOVF ADDWF MOVF ADDWFC CLRF ADDWFC
16 x 16 UNSIGNED MULTIPLY ROUTINE
; ARG1L * ARG2L-> ; PRODH:PRODL ; ;
ARG1L, W ARG2L PRODH, RES1 PRODL, RES0 ARG1H, W ARG2H PRODH, RES3 PRODL, RES2 ARG1L, W ARG2H PRODL, W RES1, F PRODH, W RES2, F WREG RES3, F ARG1H, W ARG2L PRODL, W RES1, F PRODH, W RES2, F WREG RES3, F ARG2H, 7 SIGN_ARG1 ARG1L, W RES2 ARG1H, W RES3
ARG1L, W ARG2L PRODH, RES1 PRODL, RES0 ARG1H, W ARG2H PRODH, RES3 PRODL, RES2 ARG1L, W ARG2H PRODL, W RES1, F PRODH, W RES2, F WREG RES3, F ARG1H, W ARG2L PRODL, W RES1, F PRODH, W RES2, F WREG RES3, F
; ARG1H * ARG2H-> ; PRODH:PRODL ; ;
; ARG1H * ARG2H -> ; PRODH:PRODL ; ;
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;
ARG1L * ARG2H-> PRODH:PRODL Add cross products
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;
ARG1L * ARG2H -> PRODH:PRODL Add cross products
ARG1H * ARG2L -> PRODH:PRODL Add cross products
ARG1H * ARG2L-> PRODH:PRODL Add cross products
Example 8-4 shows the sequence to do a 16 x 16 signed multiply. Equation 8-2 shows the algorithm used. The 32-bit result is stored in four registers (RES3:RES0). To account for the sign bits of the arguments, the MSb for each argument pair is tested and the appropriate subtractions are done.
; ARG2H:ARG2L neg? ; no, check ARG1 ; ; ;
ARG1H, 7 CONT_CODE ARG2L, W RES2 ARG2H, W RES3
; ARG1H:ARG1L neg? ; no, done ; ; ;
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9.0 INTERRUPTS
Members of the PIC18F87J10 family of devices have multiple interrupt sources and an interrupt priority feature that allows most interrupt sources to be assigned a high priority level or a low priority level. The high priority interrupt vector is at 0008h and the low priority interrupt vector is at 0018h. High priority interrupt events will interrupt any low priority interrupts that may be in progress. There are thirteen registers which are used to control interrupt operation. These registers are: * * * * * * * RCON INTCON INTCON2 INTCON3 PIR1, PIR2, PIR3 PIE1, PIE2, PIE3 IPR1, IPR2, IPR3 When the IPEN bit is cleared (default state), the interrupt priority feature is disabled and interrupts are compatible with PICmicro(R) mid-range devices. In Compatibility mode, the interrupt priority bits for each source have no effect. INTCON<6> is the PEIE bit which enables/disables all peripheral interrupt sources. INTCON<7> is the GIE bit which enables/disables all interrupt sources. All interrupts branch to address 0008h in Compatibility mode. When an interrupt is responded to, the global interrupt enable bit is cleared to disable further interrupts. If the IPEN bit is cleared, this is the GIE bit. If interrupt priority levels are used, this will be either the GIEH or GIEL bit. High priority interrupt sources can interrupt a low priority interrupt. Low priority interrupts are not processed while high priority interrupts are in progress. The return address is pushed onto the stack and the PC is loaded with the interrupt vector address (0008h or 0018h). Once in the Interrupt Service Routine, the source(s) of the interrupt can be determined by polling the interrupt flag bits. The interrupt flag bits must be cleared in software before re-enabling interrupts to avoid recursive interrupts. The "return from interrupt" instruction, RETFIE, exits the interrupt routine and sets the GIE bit (GIEH or GIEL if priority levels are used) which re-enables interrupts. For external interrupt events, such as the INT pins or the PORTB input change interrupt, the interrupt latency will be three to four instruction cycles. The exact latency is the same for one or two-cycle instructions. Individual interrupt flag bits are set regardless of the status of their corresponding enable bit or the GIE bit. Note: Do not use the MOVFF instruction to modify any of the interrupt control registers while any interrupt is enabled. Doing so may cause erratic microcontroller behavior.
It is recommended that the Microchip header files supplied with MPLAB(R) IDE be used for the symbolic bit names in these registers. This allows the assembler/compiler to automatically take care of the placement of these bits within the specified register. In general, interrupt sources have three bits to control their operation. They are: * Flag bit to indicate that an interrupt event occurred * Enable bit that allows program execution to branch to the interrupt vector address when the flag bit is set * Priority bit to select high priority or low priority The interrupt priority feature is enabled by setting the IPEN bit (RCON<7>). When interrupt priority is enabled, there are two bits which enable interrupts globally. Setting the GIEH bit (INTCON<7>) enables all interrupts that have the priority bit set (high priority). Setting the GIEL bit (INTCON<6>) enables all interrupts that have the priority bit cleared (low priority). When the interrupt flag, enable bit and appropriate global interrupt enable bit are set, the interrupt will vector immediately to address 0008h or 0018h, depending on the priority bit setting. Individual interrupts can be disabled through their corresponding enable bits.
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FIGURE 9-1: PIC18F87J10 FAMILY INTERRUPT LOGIC
TMR0IF TMR0IE TMR0IP RBIF RBIE RBIP INT0IF INT0IE INT1IF INT1IE INT1IP INT2IF INT2IE INT2IP INT3IF INT3IE INT3IP Wake-up if in Idle or Sleep modes
PIR1<7:0> PIE1<7:0> IPR1<7:0> PIR2<7:6, 3:0> PIE2<7:6, 3:0> IPR2<7:6, 3:0> PIR3<7, 0> PIE3<7, 0> IPR3<7, 0>
Interrupt to CPU Vector to Location 0008h
GIEH/GIE
IPEN IPEN GIEL/PEIE IPEN
High Priority Interrupt Generation Low Priority Interrupt Generation
PIR1<7:0> PIE1<7:0> IPR1<7:0> PIR2<7:6, 3:0> PIE2<7:6, 3:0> IPR2<7:6, 3:0> PIR3<7, 0> PIE3<7, 0> IPR3<7, 0>
TMR0IF TMR0IE TMR0IP RBIF RBIE RBIP INT1IF INT1IE INT1IP INT2IF INT2IE INT2IP INT3IF INT3IE INT3IP
IPEN
Interrupt to CPU Vector to Location 0018h
GIEH/GIE GIEL/PEIE
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9.1 INTCON Registers
Note: The INTCON registers are readable and writable registers which contain various enable, priority and flag bits. Interrupt flag bits are set when an interrupt condition occurs regardless of the state of its corresponding enable bit or the global interrupt enable bit. User software should ensure the appropriate interrupt flag bits are clear prior to enabling an interrupt. This feature allows for software polling.
REGISTER 9-1:
INTCON: INTERRUPT CONTROL REGISTER
R/W-0 GIE/GIEH bit 7 R/W-0 PEIE/GIEL R/W-0 TMR0IE R/W-0 INT0IE R/W-0 RBIE R/W-0 TMR0IF R/W-0 INT0IF R/W-x RBIF bit 0
bit 7
GIE/GIEH: Global Interrupt Enable bit When IPEN = 0: 1 = Enables all unmasked interrupts 0 = Disables all interrupts When IPEN = 1: 1 = Enables all high priority interrupts 0 = Disables all interrupts PEIE/GIEL: Peripheral Interrupt Enable bit When IPEN = 0: 1 = Enables all unmasked peripheral interrupts 0 = Disables all peripheral interrupts When IPEN = 1: 1 = Enables all low priority peripheral interrupts 0 = Disables all low priority peripheral interrupts TMR0IE: TMR0 Overflow Interrupt Enable bit 1 = Enables the TMR0 overflow interrupt 0 = Disables the TMR0 overflow interrupt INT0IE: INT0 External Interrupt Enable bit 1 = Enables the INT0 external interrupt 0 = Disables the INT0 external interrupt RBIE: RB Port Change Interrupt Enable bit 1 = Enables the RB port change interrupt 0 = Disables the RB port change interrupt TMR0IF: TMR0 Overflow Interrupt Flag bit 1 = TMR0 register has overflowed (must be cleared in software) 0 = TMR0 register did not overflow INT0IF: INT0 External Interrupt Flag bit 1 = The INT0 external interrupt occurred (must be cleared in software) 0 = The INT0 external interrupt did not occur RBIF: RB Port Change Interrupt Flag bit 1 = At least one of the RB7:RB4 pins changed state (must be cleared in software) 0 = None of the RB7:RB4 pins have changed state Note: A mismatch condition will continue to set this bit. Reading PORTB will end the mismatch condition and allow the bit to be cleared.
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
Legend: R = Readable bit -n = Value at POR W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown
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REGISTER 9-2: INTCON2: INTERRUPT CONTROL REGISTER 2
R/W-1 RBPU bit 7 bit 7 RBPU: PORTB Pull-up Enable bit 1 = All PORTB pull-ups are disabled 0 = PORTB pull-ups are enabled by individual port latch values INTEDG0: External Interrupt 0 Edge Select bit 1 = Interrupt on rising edge 0 = Interrupt on falling edge INTEDG1: External Interrupt 1 Edge Select bit 1 = Interrupt on rising edge 0 = Interrupt on falling edge INTEDG2: External Interrupt 2 Edge Select bit 1 = Interrupt on rising edge 0 = Interrupt on falling edge INTEDG3: External Interrupt 3 Edge Select bit 1 = Interrupt on rising edge 0 = Interrupt on falling edge TMR0IP: TMR0 Overflow Interrupt Priority bit 1 = High priority 0 = Low priority INT3IP: INT3 External Interrupt Priority bit 1 = High priority 0 = Low priority RBIP: RB Port Change Interrupt Priority bit 1 = High priority 0 = Low priority Legend: R = Readable bit -n = Value at POR Note: W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown R/W-1 INTEDG0 R/W-1 INTEDG1 R/W-1 INTEDG2 R/W-1 INTEDG3 R/W-1 TMR0IP R/W-1 INT3IP R/W-1 RBIP bit 0
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
Interrupt flag bits are set when an interrupt condition occurs regardless of the state of its corresponding enable bit or the global interrupt enable bit. User software should ensure the appropriate interrupt flag bits are clear prior to enabling an interrupt. This feature allows for software polling.
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REGISTER 9-3: INTCON3: INTERRUPT CONTROL REGISTER 3
R/W-1 INT2IP bit 7 bit 7 INT2IP: INT2 External Interrupt Priority bit 1 = High priority 0 = Low priority INT1IP: INT1 External Interrupt Priority bit 1 = High priority 0 = Low priority INT3IE: INT3 External Interrupt Enable bit 1 = Enables the INT3 external interrupt 0 = Disables the INT3 external interrupt INT2IE: INT2 External Interrupt Enable bit 1 = Enables the INT2 external interrupt 0 = Disables the INT2 external interrupt INT1IE: INT1 External Interrupt Enable bit 1 = Enables the INT1 external interrupt 0 = Disables the INT1 external interrupt INT3IF: INT3 External Interrupt Flag bit 1 = The INT3 external interrupt occurred (must be cleared in software) 0 = The INT3 external interrupt did not occur INT2IF: INT2 External Interrupt Flag bit 1 = The INT2 external interrupt occurred (must be cleared in software) 0 = The INT2 external interrupt did not occur INT1IF: INT1 External Interrupt Flag bit 1 = The INT1 external interrupt occurred (must be cleared in software) 0 = The INT1 external interrupt did not occur Legend: R = Readable bit -n = Value at POR Note: W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown R/W-1 INT1IP R/W-0 INT3IE R/W-0 INT2IE R/W-0 INT1IE R/W-0 INT3IF R/W-0 INT2IF R/W-0 INT1IF bit 0
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
Interrupt flag bits are set when an interrupt condition occurs regardless of the state of its corresponding enable bit or the global interrupt enable bit. User software should ensure the appropriate interrupt flag bits are clear prior to enabling an interrupt. This feature allows for software polling.
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9.2 PIR Registers
The PIR registers contain the individual flag bits for the peripheral interrupts. Due to the number of peripheral interrupt sources, there are three Peripheral Interrupt Request (Flag) registers (PIR1, PIR2, PIR3). Note 1: Interrupt flag bits are set when an interrupt condition occurs regardless of the state of its corresponding enable bit or the Global Interrupt Enable bit, GIE (INTCON<7>). 2: User software should ensure the appropriate interrupt flag bits are cleared prior to enabling an interrupt and after servicing that interrupt.
REGISTER 9-4:
PIR1: PERIPHERAL INTERRUPT REQUEST (FLAG) REGISTER 1
R/W-0 PSPIF bit 7 R/W-0 ADIF R-0 RC1IF R-0 TX1IF R/W-0 SSP1IF R/W-0 CCP1IF R/W-0 TMR2IF R/W-0 TMR1IF bit 0
bit 7
PSPIF: Parallel Slave Port Read/Write Interrupt Flag bit 1 = A read or a write operation has taken place (must be cleared in software) 0 = No read or write has occurred ADIF: A/D Converter Interrupt Flag bit 1 = An A/D conversion completed (must be cleared in software) 0 = The A/D conversion is not complete RC1IF: EUSART1 Receive Interrupt Flag bit 1 = The EUSART1 receive buffer, RCREGx, is full (cleared when RCREGx is read) 0 = The EUSART1 receive buffer is empty TX1IF: EUSART1 Transmit Interrupt Flag bit 1 = The EUSART1 transmit buffer, TXREGx, is empty (cleared when TXREGx is written) 0 = The EUSART1 transmit buffer is full SSP1IF: Master Synchronous Serial Port 1 Interrupt Flag bit 1 = The transmission/reception is complete (must be cleared in software) 0 = Waiting to transmit/receive CCP1IF: ECCP1 Interrupt Flag bit Capture mode: 1 = A TMR1/TMR3 register capture occurred (must be cleared in software) 0 = No TMR1/TMR3 register capture occurred Compare mode: 1 = A TMR1/TMR3 register compare match occurred (must be cleared in software) 0 = No TMR1/TMR3 register compare match occurred PWM mode: Unused in this mode. TMR2IF: TMR2 to PR2 Match Interrupt Flag bit 1 = TMR2 to PR2 match occurred (must be cleared in software) 0 = No TMR2 to PR2 match occurred TMR1IF: TMR1 Overflow Interrupt Flag bit 1 = TMR1 register overflowed (must be cleared in software) 0 = TMR1 register did not overflow Legend: R = Readable bit -n = Value at POR W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
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REGISTER 9-5: PIR2: PERIPHERAL INTERRUPT REQUEST (FLAG) REGISTER 2
R/W-0 OSCFIF bit 7 bit 7 R/W-0 CMIF U-0 -- U-0 -- R/W-0 BCL1IF U-0 -- R/W-0 TMR3IF R/W-0 CCP2IF bit 0
OSCFIF: Oscillator Fail Interrupt Flag bit 1 = Device oscillator failed, clock input has changed to INTOSC (must be cleared in software) 0 = Device clock operating CMIF: Comparator Interrupt Flag bit 1 = Comparator input has changed (must be cleared in software) 0 = Comparator input has not changed Unimplemented: Read as `0' BCL1IF: Bus Collision Interrupt Flag bit (MSSP1 module) 1 = A bus collision occurred (must be cleared in software) 0 = No bus collision occurred Unimplemented: Read as `0' TMR3IF: TMR3 Overflow Interrupt Flag bit 1 = TMR3 register overflowed (must be cleared in software) 0 = TMR3 register did not overflow CCP2IF: ECCP2 Interrupt Flag bit Capture mode: 1 = A TMR1/TMR3 register capture occurred (must be cleared in software) 0 = No TMR1/TMR3 register capture occurred Compare mode: 1 = A TMR1/TMR3 register compare match occurred (must be cleared in software) 0 = No TMR1/TMR3 register compare match occurred PWM mode: Unused in this mode. Legend: R = Readable bit -n = Value at POR W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown
bit 6
bit 5-4 bit 3
bit 2 bit 1
bit 0
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REGISTER 9-6: PIR3: PERIPHERAL INTERRUPT REQUEST (FLAG) REGISTER 3
R/W-0 SSP2IF bit 7 bit 7 SSP2IF: Master Synchronous Serial Port 2 Interrupt Flag bit 1 = The transmission/reception is complete (must be cleared in software) 0 = Waiting to transmit/receive BCL2IF: Bus Collision Interrupt Flag bit (MSSP2 module) 1 = A bus collision occurred (must be cleared in software) 0 = No bus collision occurred RC2IF: EUSART2 Receive Interrupt Flag bit 1 = The EUSART2 receive buffer, RCREGx, is full (cleared when RCREGx is read) 0 = The EUSART2 receive buffer is empty TX2IF: EUSART2 Transmit Interrupt Flag bit 1 = The EUSART2 transmit buffer, TXREGx, is empty (cleared when TXREGx is written) 0 = The EUSART2 transmit buffer is full TMR4IF: TMR4 to PR4 Match Interrupt Flag bit 1 = TMR4 to PR4 match occurred (must be cleared in software) 0 = No TMR4 to PR4 match occurred CCP5IF: CCP5 Interrupt Flag bit Capture mode: 1 = A TMR1/TMR3 register capture occurred (must be cleared in software) 0 = No TMR1/TMR3 register capture occurred Compare mode: 1 = A TMR1/TMR3 register compare match occurred (must be cleared in software) 0 = No TMR1/TMR3 register compare match occurred PWM mode: Unused in this mode. CCP4IF: CCP4 Interrupt Flag bit Capture mode: 1 = A TMR1/TMR3 register capture occurred (must be cleared in software) 0 = No TMR1/TMR3 register capture occurred Compare mode: 1 = A TMR1/TMR3 register compare match occurred (must be cleared in software) 0 = No TMR1/TMR3 register compare match occurred PWM mode: Unused in this mode. CCP3IF: ECCP3 Interrupt Flag bit Capture mode: 1 = A TMR1/TMR3 register capture occurred (must be cleared in software) 0 = No TMR1/TMR3 register capture occurred Compare mode: 1 = A TMR1/TMR3 register compare match occurred (must be cleared in software) 0 = No TMR1/TMR3 register compare match occurred PWM mode: Unused in this mode. Legend: R = Readable bit -n = Value at POR W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown R/W-0 BCL2IF R-0 RC2IF R-0 TX2IF R/W-0 TMR4IF R/W-0 CCP5IF R/W-0 CCP4IF R/W-0 CCP3IF bit 0
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
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9.3 PIE Registers
The PIE registers contain the individual enable bits for the peripheral interrupts. Due to the number of peripheral interrupt sources, there are three Peripheral Interrupt Enable registers (PIE1, PIE2, PIE3). When IPEN = 0, the PEIE bit must be set to enable any of these peripheral interrupts.
REGISTER 9-7:
PIE1: PERIPHERAL INTERRUPT ENABLE REGISTER 1
R/W-0 PSPIE bit 7 R/W-0 ADIE R/W-0 RC1IE R/W-0 TX1IE R/W-0 SSP1IE R/W-0 CCP1IE R/W-0 TMR2IE R/W-0 TMR1IE bit 0
bit 7
PSPIE: Parallel Slave Port Read/Write Interrupt Enable bit 1 = Enables the PSP read/write interrupt 0 = Disables the PSP read/write interrupt ADIE: A/D Converter Interrupt Enable bit 1 = Enables the A/D interrupt 0 = Disables the A/D interrupt RC1IE: EUSART1 Receive Interrupt Enable bit 1 = Enables the EUSART1 receive interrupt 0 = Disables the EUSART1 receive interrupt TX1IE: EUSART1 Transmit Interrupt Enable bit 1 = Enables the EUSART1 transmit interrupt 0 = Disables the EUSART1 transmit interrupt SSP1IE: Master Synchronous Serial Port 1 Interrupt Enable bit 1 = Enables the MSSP1 interrupt 0 = Disables the MSSP1 interrupt CCP1IE: ECCP1 Interrupt Enable bit 1 = Enables the ECCP1 interrupt 0 = Disables the ECCP1 interrupt TMR2IE: TMR2 to PR2 Match Interrupt Enable bit 1 = Enables the TMR2 to PR2 match interrupt 0 = Disables the TMR2 to PR2 match interrupt TMR1IE: TMR1 Overflow Interrupt Enable bit 1 = Enables the TMR1 overflow interrupt 0 = Disables the TMR1 overflow interrupt Legend: R = Readable bit -n = Value at POR W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
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REGISTER 9-8: PIE2: PERIPHERAL INTERRUPT ENABLE REGISTER 2
R/W-0 OSCFIE bit 7 bit 7 OSCFIE: Oscillator Fail Interrupt Enable bit 1 = Enabled 0 = Disabled CMIE: Comparator Interrupt Enable bit 1 = Enabled 0 = Disabled Unimplemented: Read as `0' BCL1IE: Bus Collision Interrupt Enable bit (MSSP1 module) 1 = Enabled 0 = Disabled Unimplemented: Read as `0' TMR3IE: TMR3 Overflow Interrupt Enable bit 1 = Enabled 0 = Disabled CCP2IE: ECCP2 Interrupt Enable bit 1 = Enabled 0 = Disabled Legend: R = Readable bit -n = Value at POR W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown R/W-0 CMIE U-0 -- U-0 -- R/W-0 BCL1IE U-0 -- R/W-0 TMR3IE R/W-0 CCP2IE bit 0
bit 6
bit 5-4 bit 3
bit 2 bit 1
bit 0
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REGISTER 9-9: PIE3: PERIPHERAL INTERRUPT ENABLE REGISTER 3
R/W-0 SSP2IE bit 7 bit 7 SSP2IE: Master Synchronous Serial Port 2 Interrupt Enable bit 1 = Enabled 0 = Disabled BCL2IE: Bus Collision Interrupt Enable bit (MSSP2 module) 1 = Enabled 0 = Disabled RC2IE: EUSART2 Receive Interrupt Enable bit 1 = Enabled 0 = Disabled TX2IE: EUSART2 Transmit Interrupt Enable bit 1 = Enabled 0 = Disabled TMR4IE: TMR4 to PR4 Match Interrupt Enable bit 1 = Enabled 0 = Disabled CCP5IE: CCP5 Interrupt Enable bit 1 = Enabled 0 = Disabled CCP4IE: CCP4 Interrupt Enable bit 1 = Enabled 0 = Disabled CCP3IE: ECCP3 Interrupt Enable bit 1 = Enabled 0 = Disabled Legend: R = Readable bit -n = Value at POR W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown R/W-0 BCL2IE R-0 RC2IE R-0 TX2IE R/W-0 TMR4IE R/W-0 CCP5IE R/W-0 CCP4IE R/W-0 CCP3IE bit 0
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
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9.4 IPR Registers
The IPR registers contain the individual priority bits for the peripheral interrupts. Due to the number of peripheral interrupt sources, there are three Peripheral Interrupt Priority registers (IPR1, IPR2, IPR3). Using the priority bits requires that the Interrupt Priority Enable (IPEN) bit be set.
REGISTER 9-10:
IPR1: PERIPHERAL INTERRUPT PRIORITY REGISTER 1
R/W-1 PSPIP bit 7 R/W-1 ADIP R/W-1 RC1IP R/W-1 TX1IP R/W-1 SSP1IP R/W-1 CCP1IP R/W-1 TMR2IP R/W-1 TMR1IP bit 0
bit 7
PSPIP: Parallel Slave Port Read/Write Interrupt Priority bit 1 = High priority 0 = Low priority ADIP: A/D Converter Interrupt Priority bit 1 = High priority 0 = Low priority RC1IP: EUSART1 Receive Interrupt Priority bit 1 = High priority 0 = Low priority TX1IP: EUSART1 Transmit Interrupt Priority bit 1 = High priority 0 = Low priority
bit 6
bit 5
bit 4
bit 3
SSP1IP: Master Synchronous Serial Port 1 Interrupt Priority bit 1 = High priority 0 = Low priority CCP1IP: ECCP1 Interrupt Priority bit 1 = High priority 0 = Low priority TMR2IP: TMR2 to PR2 Match Interrupt Priority bit 1 = High priority 0 = Low priority TMR1IP: TMR1 Overflow Interrupt Priority bit 1 = High priority 0 = Low priority Legend: R = Readable bit -n = Value at POR W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown
bit 2
bit 1
bit 0
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REGISTER 9-11: IPR2: PERIPHERAL INTERRUPT PRIORITY REGISTER 2
R/W-1 OSCFIP bit 7 bit 7 OSCFIP: Oscillator Fail Interrupt Priority bit 1 = High priority 0 = Low priority CMIP: Comparator Interrupt Priority bit 1 = High priority 0 = Low priority Unimplemented: Read as `0' BCL1IP: Bus Collision Interrupt Priority bit (MSSP1 module) 1 = High priority 0 = Low priority Unimplemented: Read as `0' TMR3IP: TMR3 Overflow Interrupt Priority bit 1 = High priority 0 = Low priority CCP2IP: ECCP2 Interrupt Priority bit 1 = High priority 0 = Low priority Legend: R = Readable bit -n = Value at POR W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown R/W1 CMIP U-0 -- U-0 -- R/W-1 BCL1IP U-0 -- R/W-1 TMR3IP R/W-1 CCP2IP bit 0
bit 6
bit 5-4 bit 3
bit 2 bit 1
bit 0
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REGISTER 9-12: IPR3: PERIPHERAL INTERRUPT PRIORITY REGISTER 3
R/W-1 SSP2IP bit 7 bit 7 SSP2IP: Master Synchronous Serial Port 2 Interrupt Priority bit 1 = High priority 0 = Low priority BCL2IP: Bus Collision Interrupt Priority bit (MSSP2 module) 1 = High priority 0 = Low priority RC2IP: EUSART2 Receive Interrupt Priority bit 1 = High priority 0 = Low priority TX2IP: EUSART2 Transmit Interrupt Priority bit 1 = High priority 0 = Low priority TMR4IE: TMR4 to PR4 Interrupt Priority bit 1 = High priority 0 = Low priority CCP5IP: CCP5 Interrupt Priority bit 1 = High priority 0 = Low priority CCP4IP: CCP4 Interrupt Priority bit 1 = High priority 0 = Low priority CCP3IP: ECCP3 Interrupt Priority bit 1 = High priority 0 = Low priority Legend: R = Readable bit -n = Value at POR W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown R/W-1 BCL2IP R/W-1 RC2IP R/W-1 TX2IP R/W-1 TMR4IP R/W-1 CCP5IP R/W-1 CCP4IP R/W-1 CCP3IP bit 0
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
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9.5 RCON Register
The RCON register contains bits used to determine the cause of the last Reset or wake-up from Idle or Sleep modes. RCON also contains the bit that enables interrupt priorities (IPEN).
REGISTER 9-13:
RCON: RESET CONTROL REGISTER
R/W-0 IPEN bit 7 U-0 -- U-0 -- R/W-1 RI R-1 TO R-1 PD R/W-0 POR R/W-0 BOR bit 0
bit 7
IPEN: Interrupt Priority Enable bit 1 = Enable priority levels on interrupts 0 = Disable priority levels on interrupts (PIC16CXXX Compatibility mode) Unimplemented: Read as `0' RI: RESET Instruction Flag bit For details of bit operation, see Register 4-1. TO: Watchdog Timer Time-out Flag bit For details of bit operation, see Register 4-1. PD: Power-Down Detection Flag bit For details of bit operation, see Register 4-1. POR: Power-on Reset Status bit For details of bit operation, see Register 4-1. BOR: Brown-out Reset Status bit For details of bit operation, see Register 4-1. Legend: R = Readable bit -n = Value at POR W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown
bit 6-5 bit 4 bit 3 bit 2 bit 1 bit 0
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9.6 INTn Pin Interrupts 9.7 TMR0 Interrupt
External interrupts on the RB0/INT0, RB1/INT1, RB2/INT2 and RB3/INT3 pins are edge-triggered. If the corresponding INTEDGx bit in the INTCON2 register is set (= 1), the interrupt is triggered by a rising edge; if the bit is clear, the trigger is on the falling edge. When a valid edge appears on the RBx/INTx pin, the corresponding flag bit, INTxIF, is set. This interrupt can be disabled by clearing the corresponding enable bit, INTxIE. Flag bit, INTxIF, must be cleared in software in the Interrupt Service Routine before re-enabling the interrupt. All external interrupts (INT0, INT1, INT2 and INT3) can wake-up the processor from the power-managed modes if bit INTxIE was set prior to going into power-managed modes. If the Global Interrupt Enable bit, GIE, is set, the processor will branch to the interrupt vector following wake-up. Interrupt priority for INT1, INT2 and INT3 is determined by the value contained in the interrupt priority bits, INT1IP (INTCON3<6>), INT2IP (INTCON3<7>) and INT3IP (INTCON2<1>). There is no priority bit associated with INT0. It is always a high priority interrupt source. In 8-bit mode (which is the default), an overflow in the TMR0 register (FFh 00h) will set flag bit, TMR0IF. In 16-bit mode, an overflow in the TMR0H:TMR0L register pair (FFFFh 0000h) will set TMR0IF. The interrupt can be enabled/disabled by setting/clearing enable bit, TMR0IE (INTCON<5>). Interrupt priority for Timer0 is determined by the value contained in the interrupt priority bit, TMR0IP (INTCON2<2>). See Section 11.0 "Timer0 Module" for further details on the Timer0 module.
9.8
PORTB Interrupt-on-Change
An input change on PORTB<7:4> sets flag bit, RBIF (INTCON<0>). The interrupt can be enabled/disabled by setting/clearing enable bit, RBIE (INTCON<3>). Interrupt priority for PORTB interrupt-on-change is determined by the value contained in the interrupt priority bit, RBIP (INTCON2<0>).
9.9
Context Saving During Interrupts
During interrupts, the return PC address is saved on the stack. Additionally, the WREG, STATUS and BSR registers are saved on the fast return stack. If a fast return from interrupt is not used (see Section 5.3 "Data Memory Organization"), the user may need to save the WREG, STATUS and BSR registers on entry to the Interrupt Service Routine. Depending on the user's application, other registers may also need to be saved. Example 9-1 saves and restores the WREG, STATUS and BSR registers during an Interrupt Service Routine.
EXAMPLE 9-1:
SAVING STATUS, WREG AND BSR REGISTERS IN RAM
; W_TEMP is in virtual bank ; STATUS_TEMP located anywhere ; BSR_TMEP located anywhere
MOVWF W_TEMP MOVFF STATUS, STATUS_TEMP MOVFF BSR, BSR_TEMP ; ; USER ISR CODE ; MOVFF BSR_TEMP, BSR MOVF W_TEMP, W MOVFF STATUS_TEMP, STATUS
; Restore BSR ; Restore WREG ; Restore STATUS
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10.0 I/O PORTS
10.1 I/O Port Pin Capabilities
Depending on the device selected and features enabled, there are up to nine ports available. Some pins of the I/O ports are multiplexed with an alternate function from the peripheral features on the device. In general, when a peripheral is enabled, that pin may not be used as a general purpose I/O pin. Each port has three registers for its operation. These registers are: * TRIS register (data direction register) * Port register (reads the levels on the pins of the device) * LAT register (output latch) The Data Latch (LAT register) is useful for read-modify-write operations on the value that the I/O pins are driving. A simplified model of a generic I/O port, without the interfaces to other peripherals, is shown in Figure 10-1. When developing an application, the capabilities of the port pins must be considered. Outputs on some pins have higher output drive strength than others. Similarly, some pins can tolerate higher than VDD input levels.
10.1.1
PIN OUTPUT DRIVE
The output pin drive strengths vary for groups of pins intended to meet the needs for a variety of applications. PORTB and PORTC are designed to drive higher loads, such as LEDs. The external memory interface ports (PORTD, PORTE and PORTJ) are designed to drive medium loads. All other ports are designed for small loads, typically indication only. Table 10-1 summarizes the output capabilities. Refer to Section 26.0 "Electrical Characteristics" for more details.
TABLE 10-1:
Port PORTA PORTF PORTG PORTH(1) PORTD
OUTPUT DRIVE LEVELS
Drive Description
FIGURE 10-1:
GENERIC I/O PORT OPERATION
Minimum Intended for indication.
RD LAT Data Bus WR LAT or Port
Medium
D
Q I/O pin(1)
PORTE PORTJ(1) PORTB PORTC Note 1: High
Sufficient drive levels for external memory interfacing as well as indication. Suitable for direct LED drive levels.
CK Data Latch D Q
These ports are not available on 64-pin devices.
WR TRIS
CK TRIS Latch Input Buffer
RD TRIS
Q
D EN EN
RD Port Note 1: I/O pins have diode protection to VDD and VSS.
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10.1.2 INPUT PINS AND VOLTAGE CONSIDERATIONS
10.2
PORTA, TRISA and LATA Registers
The voltage tolerance of pins used as device inputs is dependent on the pin's input function. Pins that are used as digital only inputs are able to handle DC voltages up to 5.5V, a level typical for digital logic circuits. In contrast, pins that also have analog input functions of any kind can only tolerate voltages up to VDD. Voltage excursions beyond VDD on these pins should be avoided. Table 10-2 summarizes the input capabilities. Refer to Section 26.0 "Electrical Characteristics" for more details.
PORTA is a 6-bit wide, bidirectional port. The corresponding data direction register is TRISA. Setting a TRISA bit (= 1) will make the corresponding PORTA pin an input (i.e., put the corresponding output driver in a high-impedance mode). Clearing a TRISA bit (= 0) will make the corresponding PORTA pin an output (i.e., put the contents of the output latch on the selected pin). Reading the PORTA register reads the status of the pins, whereas writing to it, will write to the port latch. The Data Latch register (LATA) is also memory mapped. Read-modify-write operations on the LATA register read and write the latched output value for PORTA. The RA4 pin is multiplexed with the Timer0 module clock input to become the RA4/T0CKI pin. The other PORTA pins are multiplexed with the analog VREF+ and VREF- inputs. The operation of pins RA5:RA0 as A/D converter inputs is selected by clearing or setting the PCFG3:PCFG0 control bits in the ADCON1 register. Note: RA5 and RA3:RA0 are configured as analog inputs on any Reset and are read as `0'. RA4 is configured as a digital input.
TABLE 10-2:
Port or Pin PORTA<5:0> PORTC<1:0> PORTF<6:1> PORTH<7:4>(1) PORTB<7:0> PORTC<7:2> PORTD<7:0> PORTE<7:0> PORTF<7> PORTG<4:0> PORTH<3:0>(1) PORTJ<7:0>(1) Note 1:
INPUT VOLTAGE LEVELS
Tolerated Input VDD Description Only VDD input levels tolerated.
5.5V
Tolerates input levels above VDD, useful for most standard logic.
The RA4/T0CKI pin is a Schmitt Trigger input. All other PORTA pins have TTL input levels and full CMOS output drivers. The TRISA register controls the direction of the PORTA pins, even when they are being used as analog inputs. The user must ensure the bits in the TRISA register are maintained set when using them as analog inputs.
These ports are not available on 64-pin devices.
EXAMPLE 10-1:
CLRF ; ; ; LATA ; ; ; 07h ; ADCON1 ; 07h ; CMCON ; 0CFh ; ; ; TRISA ; ; PORTA
INITIALIZING PORTA
Initialize PORTA by clearing output data latches Alternate method to clear output data latches Configure A/D for digital inputs Configure comparators for digital input Value used to initialize data direction Set RA<3:0> as inputs RA<5:4> as outputs
CLRF
MOVLW MOVWF MOVWF MOVWF MOVLW
MOVWF
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TABLE 10-3:
Pin Name RA0/AN0
PORTA FUNCTIONS
Function RA0 AN0 TRIS Setting 0 1 I/O O I I 0 1 AN1 O I I 0 1 AN2 VREF1 1 0 1 AN3 VREF+ 1 1 0 1 T0CKI x 0 1 AN4 1 O I I I O I I I O I I O I I I/O Type DIG TTL ANA DIG TTL ANA DIG TTL ANA ANA DIG TTL ANA ANA DIG ST ST DIG TTL ANA Description LATA<0> data output; not affected by analog input. PORTA<0> data input; disabled when analog input enabled. A/D input channel 0. Default input configuration on POR; does not affect digital output. LATA<1> data output; not affected by analog input. PORTA<1> data input; disabled when analog input enabled. A/D input channel 1. Default input configuration on POR; does not affect digital output. LATA<2> data output; not affected by analog input. Disabled when CVREF output enabled. PORTA<2> data input. Disabled when analog functions enabled; disabled when CVREF output enabled. A/D input channel 2 and Comparator C2+ input. Default input configuration on POR; not affected by analog output. A/D and Comparator low reference voltage input. LATA<3> data output; not affected by analog input. PORTA<3> data input; disabled when analog input enabled. A/D input channel 3. Default input configuration on POR. A/D high reference voltage input. LATA<4> data output. PORTA<4> data input; default configuration on POR. Timer0 clock input. LATA<5> data output; not affected by analog input. PORTA<5> data input; disabled when analog input enabled. A/D input channel 4. Default configuration on POR.
RA1/AN1
RA1
RA2/AN2/VREF-
RA2
RA3/AN3/VREF+
RA3
RA4/T0CKI
RA4
RA5/AN4
RA5
Legend:
PWR = Power Supply, O = Output, I = Input, ANA = Analog Signal, DIG = Digital Output, ST = Schmitt Buffer Input, TTL = TTL Buffer Input, x = Don't care (TRIS bit does not affect port direction or is overridden for this option).
TABLE 10-4:
Name PORTA LATA TRISA ADCON1
SUMMARY OF REGISTERS ASSOCIATED WITH PORTA
Bit 7 -- -- -- -- Bit 6 -- -- -- -- Bit 5 RA5 LATA5 TRISA5 VCFG1 Bit 4 RA4 LATA4 TRISA4 VCFG0 Bit 3 RA3 LATA3 TRISA3 PCFG3 Bit 2 RA2 LATA2 TRISA2 PCFG2 Bit 1 RA1 LATA1 TRISA1 PCFG1 Bit 0 RA0 LATA0 TRISA0 PCFG0 Reset Values on page 52 52 52 50
Legend: -- = unimplemented, read as `0'. Shaded cells are not used by PORTA.
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10.3 PORTB, TRISB and LATB Registers
Four of the PORTB pins (RB7:RB4) have an interrupt-on-change feature. Only pins configured as inputs can cause this interrupt to occur (i.e., any RB7:RB4 pin configured as an output is excluded from the interrupt-on-change comparison). The input pins (of RB7:RB4) are compared with the old value latched on the last read of PORTB. The "mismatch" outputs of RB7:RB4 are ORed together to generate the RB Port Change Interrupt with Flag bit, RBIF (INTCON<0>). This interrupt can wake the device from power-managed modes. The user, in the Interrupt Service Routine, can clear the interrupt in the following manner: a) Any read or write of PORTB (except with the MOVFF (ANY), PORTB instruction). This will end the mismatch condition. Clear flag bit RBIF.
PORTB is an 8-bit wide, bidirectional port. The corresponding data direction register is TRISB. Setting a TRISB bit (= 1) will make the corresponding PORTB pin an input (i.e., put the corresponding output driver in a high-impedance mode). Clearing a TRISB bit (= 0) will make the corresponding PORTB pin an output (i.e., put the contents of the output latch on the selected pin). All pins on PORTB are digital only and tolerate voltages up to 5.5V. The Data Latch register (LATB) is also memory mapped. Read-modify-write operations on the LATB register read and write the latched output value for PORTB.
EXAMPLE 10-2:
CLRF PORTB ; ; ; ; ; ; ; ; ; ; ; ;
INITIALIZING PORTB
Initialize PORTB by clearing output data latches Alternate method to clear output data latches Value used to initialize data direction Set RB<3:0> as inputs RB<5:4> as outputs RB<7:6> as inputs
b)
A mismatch condition will continue to set flag bit RBIF. Reading PORTB will end the mismatch condition and allow flag bit RBIF to be cleared. The interrupt-on-change feature is recommended for wake-up on key depression operation and operations where PORTB is only used for the interrupt-on-change feature. Polling of PORTB is not recommended while using the interrupt-on-change feature. For 80-pin devices, RB3 can be configured as the alternate peripheral pin for the ECCP2 module and Enhanced PWM output 2A by clearing the CCP2MX configuration bit. This applies only to 80-pin devices operating in Extended Microcontroller mode. If the device is in Microcontroller mode, the alternate assignment for ECCP2 is RE7. As with other ECCP2 configurations, the user must ensure that the TRISB<3> bit is set appropriately for the intended operation.
CLRF
LATB
MOVLW
0CFh
MOVWF
TRISB
Each of the PORTB pins has a weak internal pull-up. A single control bit can turn on all the pull-ups. This is performed by clearing bit RBPU (INTCON2<7>). The weak pull-up is automatically turned off when the port pin is configured as an output. The pull-ups are disabled on a Power-on Reset.
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TABLE 10-5:
Pin Name RB0/INT0/FLT0
PORTB FUNCTIONS
Function RB0 INT0 FLT0 TRIS Setting 0 1 1 1 0 1 INT1 1 0 1 INT2 1 0 1 INT3 ECCP2(1) P2A(1) 1 0 1 0 0 1 KBI0 I/O O I I I O I I O I I O I I O I O O I I 0 1 KBI1 O I I 0 1 KBI2 PGC 1 x 0 1 KBI3 PGD 1 x x O I I I O I I O I I/O Type DIG TTL ST ST DIG TTL ST DIG TTL ST DIG TTL ST DIG ST DIG DIG TTL TTL DIG TTL TTL DIG TTL TTL ST DIG TTL TTL DIG ST LATB<0> data output. PORTB<0> data input; weak pull-up when RBPU bit is cleared. External interrupt 0 input. Enhanced PWM Fault input (ECCP1 module); enabled in software. LATB<1> data output. PORTB<1> data input; weak pull-up when RBPU bit is cleared. External interrupt 1 input. LATB<2> data output. PORTB<2> data input; weak pull-up when RBPU bit is cleared. External interrupt 2 input. LATB<3> data output. PORTB<3> data input; weak pull-up when RBPU bit is cleared. External interrupt 3 input. CCP2 Compare output and CCP2 PWM output; takes priority over port data. CCP2 Capture input. ECCP2 Enhanced PWM output, channel A. May be configured for tri-state during Enhanced PWM shutdown events. Takes priority over port data. LATB<4> data output. PORTB<4> data input; weak pull-up when RBPU bit is cleared. Interrupt on pin change. LATB<5> data output. PORTB<5> data input; weak pull-up when RBPU bit is cleared. Interrupt on pin change. LATB<6> data output. PORTB<6> data input; weak pull-up when RBPU bit is cleared. Interrupt on pin change. Serial execution (ICSPTM) clock input for ICSP and ICD operation.(2) LATB<7> data output. PORTB<7> data input; weak pull-up when RBPU bit is cleared. Interrupt on pin change. Serial execution data output for ICSP and ICD operation.(2) Serial execution data input for ICSP and ICD operation.(2) Description
RB1/INT1
RB1
RB2/INT2
RB2
RB3/INT3/ ECCP2/P2A
RB3
RB4/KBI0
RB4
RB5/KBI1
RB5
RB6/KBI2/PGC
RB6
RB7/KBI3/PGD
RB7
Legend: Note 1: 2:
PWR = Power Supply, O = Output, I = Input, ANA = Analog Signal, DIG = Digital Output, ST = Schmitt Buffer Input, TTL = TTL Buffer Input, x = Don't care (TRIS bit does not affect port direction or is overridden for this option). Alternate assignment for ECCP2/P2A when the CCP2MX configuration bit is cleared (Extended Microcontroller mode, 80-pin devices only). Default assignment is RC1. All other pin functions are disabled when ICSP or ICD are enabled.
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TABLE 10-6:
Name PORTB LATB TRISB INTCON INTCON2 INTCON3
SUMMARY OF REGISTERS ASSOCIATED WITH PORTB
Bit 7 RB7 LATB7 TRISB7 RBPU INT2IP Bit 6 RB6 LATB6 TRISB6 Bit 5 RB5 LATB5 TRISB5 TMR0IE INT3IE Bit 4 RB4 LATB4 TRISB4 INT0IE INT2IE Bit 3 RB3 LATB3 TRISB3 RBIE INT1IE Bit 2 RB2 LATB2 TRISB2 TMR0IF INT3IF Bit 1 RB1 LATB1 TRISB1 INT0IF INT3IP INT2IF Bit 0 RB0 LATB0 TRISB0 RBIF RBIP INT1IF Reset Values on page 52 52 52 49 49 49
GIE/GIEH PEIE/GIEL INT1IP
INTEDG0 INTEDG1 INTEDG2 INTEDG3 TMR0IP
Legend: Shaded cells are not used by PORTB.
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10.4 PORTC, TRISC and LATC Registers
Note: These pins are configured as digital inputs on any device Reset.
PORTC is an 8-bit wide, bidirectional port. The corresponding data direction register is TRISC. Setting a TRISC bit (= 1) will make the corresponding PORTC pin an input (i.e., put the corresponding output driver in a high-impedance mode). Clearing a TRISC bit (= 0) will make the corresponding PORTC pin an output (i.e., put the contents of the output latch on the selected pin). Only PORTC pins RC2 through RC7 are digital only pins and can tolerate input voltages up to 5.5V. The Data Latch register (LATC) is also memory mapped. Read-modify-write operations on the LATC register read and write the latched output value for PORTC. PORTC is multiplexed with several peripheral functions (Table 10-7). The pins have Schmitt Trigger input buffers. RC1 is normally configured by configuration bit CCP2MX as the default peripheral pin for the ECCP2 module and enhanced PWM output P2A (default state, CCP2MX = 1). When enabling peripheral functions, care should be taken in defining TRIS bits for each PORTC pin. Some peripherals override the TRIS bit to make a pin an output, while other peripherals override the TRIS bit to make a pin an input. The user should refer to the corresponding peripheral section for the correct TRIS bit settings.
The contents of the TRISC register are affected by peripheral overrides. Reading TRISC always returns the current contents, even though a peripheral device may be overriding one or more of the pins.
EXAMPLE 10-3:
CLRF PORTC ; ; ; ; ; ; ; ; ; ; ; ;
INITIALIZING PORTC
Initialize PORTC by clearing output data latches Alternate method to clear output data latches Value used to initialize data direction Set RC<3:0> as inputs RC<5:4> as outputs RC<7:6> as inputs
CLRF
LATC
MOVLW
0CFh
MOVWF
TRISC
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TABLE 10-7:
Pin Name RC0/T1OSO/ T13CKI
PORTC FUNCTIONS
Function RC0 T1OSO T13CKI TRIS Setting 0 1 x 1 0 1 T1OSI ECCP2(1) P2A(1) x 0 1 0 0 1 ECCP1 P1A 0 1 0 0 1 SCK1 SCL1 0 1 0 1 I/O O I O I O I I O I O O I O I O O I O I O I O I I O I O I O O I O O I O I I O I I/O Type DIG ST ANA ST DIG ST ANA DIG ST DIG DIG ST DIG ST DIG DIG ST DIG ST DIG ST DIG ST ST DIG ST DIG ST DIG DIG ST DIG DIG ST DIG ST ST DIG ST LATC<0> data output. PORTC<0> data input. Timer1 oscillator output; enabled when Timer1 oscillator enabled. Disables digital I/O. Timer1/Timer3 counter input. LATC<1> data output. PORTC<1> data input. Timer1 oscillator input; enabled when Timer1 oscillator enabled. Disables digital I/O. CCP2 Compare output and CCP2 PWM output; takes priority over port data. CCP2 Capture input. ECCP2 Enhanced PWM output, channel A. May be configured for tri-state during Enhanced PWM shutdown events. Takes priority over port data. LATC<2> data output. PORTC<2> data input. CCP1 Compare output and CCP1 PWM output; takes priority over port data. CCP1 Capture input. ECCP1 Enhanced PWM output, channel A. May be configured for tri-state during Enhanced PWM shutdown events. Takes priority over port data. LATC<3> data output. PORTC<3> data input. SPITM clock output (MSSP1 module); takes priority over port data. SPI clock input (MSSP1 module). I2CTM clock output (MSSP1 module); takes priority over port data. I2C clock input (MSSP1 module); input type depends on module setting. LATC<4> data output. PORTC<4> data input. SPI data input (MSSP1 module). I2C data output (MSSP1 module); takes priority over port data. I2C data input (MSSP1 module); input type depends on module setting. LATC<5> data output. PORTC<5> data input. SPI data output (MSSP1 module); takes priority over port data. LATC<6> data output. PORTC<6> data input. Synchronous serial data output (EUSART1 module); takes priority over port data. Synchronous serial data input (EUSART1 module). User must configure as an input. Synchronous serial clock input (EUSART1 module). LATC<7> data output. PORTC<7> data input. Asynchronous serial receive data input (EUSART1 module). Synchronous serial data output (EUSART1 module); takes priority over port data. Synchronous serial data input (EUSART1 module). User must configure as an input. Description
RC1/T1OSI/ ECCP2/P2A
RC1
RC2/ECCP1/ P1A
RC2
RC3/SCK1/ SCL1
RC3
RC4/SDI1/ SDA1
RC4 SDI1 SDA1
0 1 1 1 1 0 1
RC5/SDO1
RC5 SDO1
0 0 1
RC6/TX1/CK1
RC6 TX1 CK1
1 1 1
RC7/RX1/DT1
RC7 RX1 DT1
0 1 1 1 1
Legend: Note 1:
PWR = Power Supply, O = Output, I = Input, ANA = Analog Signal, DIG = Digital Output, ST = Schmitt Buffer Input, TTL = TTL Buffer Input, x = Don't care (TRIS bit does not affect port direction or is overridden for this option). Default assignment for ECCP2/P2A when CCP2MX configuration bit is set.
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TABLE 10-8:
Name PORTC LATC TRISC
SUMMARY OF REGISTERS ASSOCIATED WITH PORTC
Bit 7 RC7 LATC7 TRISC7 Bit 6 RC6 LATBC6 TRISC6 Bit 5 RC5 LATC5 TRISC5 Bit 4 RC4 LATCB4 TRISC4 Bit 3 RC3 LATC3 TRISC3 Bit 2 RC2 LATC2 TRISC2 Bit 1 RC1 LATC1 TRISC1 Bit 0 RC0 LATC0 TRISC0 Reset Values on page 52 52 52
Legend: Shaded cells are not used by PORTC.
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10.5 PORTD, TRISD and LATD Registers
PORTD can also be configured to function as an 8-bit wide, parallel microprocessor port by setting the PSPMODE control bit (PSPCON<4>). In this mode, parallel port data takes priority over other digital I/O (but not the external memory interface). When the parallel port is active, the input buffers are TTL. For more information, refer to Section 10.11 "Parallel Slave Port".
PORTD is an 8-bit wide, bidirectional port. The corresponding data direction register is TRISD. Setting a TRISD bit (= 1) will make the corresponding PORTD pin an input (i.e., put the corresponding output driver in a high-impedance mode). Clearing a TRISD bit (= 0) will make the corresponding PORTD pin an output (i.e., put the contents of the output latch on the selected pin). All pins on PORTD are digital only and tolerate voltages up to 5.5V. The Data Latch register (LATD) is also memory mapped. Read-modify-write operations on the LATD register read and write the latched output value for PORTD. All pins on PORTD are implemented with Schmitt Trigger input buffers. Each pin is individually configurable as an input or output. Note: These pins are configured as digital inputs on any device Reset.
EXAMPLE 10-4:
CLRF PORTD ; ; ; ; ; ; ; ; ; ; ; ;
INITIALIZING PORTD
Initialize PORTD by clearing output data latches Alternate method to clear output data latches Value used to initialize data direction Set RD<3:0> as inputs RD<5:4> as outputs RD<7:6> as inputs
CLRF
LATD
MOVLW
0CFh
MOVWF
TRISD
On 80-pin devices, PORTD is multiplexed with the system bus as part of the external memory interface. I/O port and other functions are only available when the interface is disabled, by setting the EBDIS bit (MEMCON<7>). When the interface is enabled, PORTD is the low-order byte of the multiplexed address/data bus (AD7:AD0). The TRISD bits are also overridden. Each of the PORTD pins has a weak internal pull-up. The pull-ups are provided to keep the inputs at a known state for the external memory interface while powering up. A single control bit can turn off all the pull-ups. This is performed by clearing bit RDPU (PORTG<7>). The weak pull-up is automatically turned off when the port pin is configured as an output. The pull-ups are disabled on all device Resets.
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TABLE 10-9:
Pin Name RD0/AD0/PSP0
PORTD FUNCTIONS
Function RD0 AD0(2) PSP0 TRIS Setting 0 1 x x I/O O I O I O I 0 1 AD1(2) PSP1 x x x x 0 1 AD2(2) PSP2 x x x x 0 1 AD3(2) PSP3 x x x x 0 1 AD4(2) PSP4 SDO2 x x x x 0 0 1 AD5(2) PSP5 SDI2 SDA2 x x x x 1 1 1 O I O I O I O I O I O I O I O I O I O I O I O I O O I O I O I I O I I/O Type DIG ST DIG TTL DIG TTL DIG ST DIG TTL DIG TTL DIG ST DIG TTL DIG TTL DIG ST DIG TTL DIG TTL DIG ST DIG TTL DIG TTL DIG DIG ST DIG TTL DIG TTL ST DIG ST LATD<0> data output. PORTD<0> data input. External memory interface, address/data bit 0 output.(1) External memory interface, data bit 0 input.(1) PSP read output data (LATD<0>); takes priority over port data. PSP write data input. LATD<1> data output. PORTD<1> data input. External memory interface, address/data bit 1 output.(1) External memory interface, data bit 1 input.(1) PSP read output data (LATD<1>); takes priority over port data. PSP write data input. LATD<2> data output. PORTD<2> data input. External memory interface, address/data bit 2 output.(1) External memory interface, data bit 2 input.(1) PSP read output data (LATD<2>); takes priority over port data. PSP write data input. LATD<3> data output. PORTD<3> data input. External memory interface, address/data bit 3 output.(1) External memory interface, data bit 3 input.(1) PSP read output data (LATD<3>); takes priority over port data. PSP write data input. LATD<4> data output. PORTD<4> data input. External memory interface, address/data bit 4 output.(1) External memory interface, data bit 4 input.(1) PSP read output data (LATD<4>); takes priority over port data. PSP write data input. SPITM data output (MSSP2 module); takes priority over port data. LATD<5> data output. PORTD<5> data input. External memory interface, address/data bit 5 output.(1) External memory interface, data bit 5 input.(1) PSP read output data (LATD<5>); takes priority over port data. PSP write data input. SPI data input (MSSP2 module). I2CTM data output (MSSP2 module); takes priority over port data. I2C data input (MSSP2 module); input type depends on module setting. Description
RD1/AD1/PSP1
RD1
RD2/AD2/PSP2
RD2
RD3/AD3/PSP3
RD3
RD4/AD4/ PSP4/SDO2
RD4
RD5/AD5/ PSP5/SDI2/ SDA2
RD5
Legend: Note 1: 2:
PWR = Power Supply, O = Output, I = Input, ANA = Analog Signal, DIG = Digital Output, ST = Schmitt Buffer Input, TTL = TTL Buffer Input, x = Don't care (TRIS bit does not affect port direction or is overridden for this option). External memory interface I/O takes priority over all other digital and PSP I/O. Available on 80-pin devices only.
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TABLE 10-9:
Pin Name RD6/AD6/ PSP6/SCK2/ SCL2
PORTD FUNCTIONS (CONTINUED)
Function RD6 AD6(2) PSP6 SCK1 SCL1 TRIS Setting 0 1 x x x x 0 1 0 1 I/O O I O I O I O I O I O I O I O I I I/O Type DIG ST DIG-3 TTL DIG TTL DIG ST DIG ST DIG ST DIG TTL DIG TTL TTL LATD<6> data output. PORTD<6> data input. External memory interface, address/data bit 6 output.(1) External memory interface, data bit 6 input.(1) PSP read output data (LATD<6>); takes priority over port data. PSP write data input. SPITM clock output (MSSP2 module); takes priority over port data. SPI clock input (MSSP2 module). I2CTM clock output (MSSP2 module); takes priority over port data. I2C clock input (MSSP2 module); input type depends on module setting. LATD<7> data output. PORTD<7> data input. External memory interface, address/data bit 7 output.(1) External memory interface, data bit 7 input.(1) PSP read output data (LATD<7>); takes priority over port data. PSP write data input. Slave select input for SSP (MSSP2 module). Description
RD7/AD7/ PSP7/SS2
RD7 AD7
(2)
0 1 x x x x
PSP7 SS2 Legend: Note 1: 2:
x
PWR = Power Supply, O = Output, I = Input, ANA = Analog Signal, DIG = Digital Output, ST = Schmitt Buffer Input, TTL = TTL Buffer Input, x = Don't care (TRIS bit does not affect port direction or is overridden for this option). External memory interface I/O takes priority over all other digital and PSP I/O. Available on 80-pin devices only.
TABLE 10-10: SUMMARY OF REGISTERS ASSOCIATED WITH PORTD
Name PORTD LATD TRISD PORTG Bit 7 RD7 LATD7 TRISD7 RDPU Bit 6 RD6 LATD6 TRISD6 REPU Bit 5 RD5 LATD5 TRISD5 RJPU(1) Bit 4 RD4 LATD4 TRISD4 RG4 Bit 3 RD3 LATD3 TRISD3 RG3 Bit 2 RD2 LATD2 TRISD2 RG2 Bit 1 RD1 LATD1 TRISD1 RG1 Bit 0 RD0 LATD0 TRISD0 RG0 Reset Values on page 52 52 52 52
Legend: Shaded cells are not used by PORTD. Note 1: Unimplemented on 64-pin devices; read as `0'.
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10.6 PORTE, TRISE and LATE Registers
PORTE is also multiplexed with Enhanced PWM outputs B and C for ECCP1 and ECCP3 and outputs B, C and D for ECCP2. For all devices, their default assignments are on PORTE<6:3>. On 80-pin devices, the multiplexing for the outputs of ECCP1 and ECCP3 is controlled by the ECCPMX configuration bit. Clearing this bit reassigns the P1B/P1C and P3B/P3C outputs to PORTH. For devices operating in Microcontroller mode, pin RE7 can be configured as the alternate peripheral pin for the ECCP2 module and Enhanced PWM output 2A. This is done by clearing the CCP2MX configuration bit. When the Parallel Slave Port is active on PORTD, three of the PORTE pins (RE0, RE1 and RE2) are configured as digital control inputs for the port. The control functions are summarized in Table 10-11. The reconfiguration occurs automatically when the PSPMODE control bit (PSPCON<4>) is set. Users must still make certain the corresponding TRISE bits are set to configure these pins as digital inputs.
PORTE is a 7-bit wide, bidirectional port. The corresponding data direction register is TRISE. Setting a TRISE bit (= 1) will make the corresponding PORTE pin an input (i.e., put the corresponding output driver in a high-impedance mode). Clearing a TRISE bit (= 0) will make the corresponding PORTE pin an output (i.e., put the contents of the output latch on the selected pin). All pins on PORTE are digital only and tolerate voltages up to 5.5V. The Data Latch register (LATE) is also memory mapped. Read-modify-write operations on the LATE register read and write the latched output value for PORTE. All pins on PORTE are implemented with Schmitt Trigger input buffers. Each pin is individually configurable as an input or output. Note: These pins are configured as digital inputs on any device Reset.
EXAMPLE 10-5:
CLRF PORTE ; ; ; ; ; ; ; ; ; ; ;
INITIALIZING PORTE
Initialize PORTE by clearing output data latches Alternate method to clear output data latches Value used to initialize data direction Set RE<1:0> as inputs RE<7:2> as outputs
On 80-pin devices, PORTE is multiplexed with the system bus as part of the external memory interface. I/O port and other functions are only available when the interface is disabled, by setting the EBDIS bit (MEMCON<7>). When the interface is enabled, PORTE is the high-order byte of the multiplexed address/data bus (AD15:AD8). The TRISE bits are also overridden. Each of the PORTE pins has a weak internal pull-up. The pull-ups are provided to keep the inputs at a known state for the external memory interface while powering up. A single control bit can turn off all the pull-ups. This is performed by clearing bit REPU (PORTG<6>). The weak pull-up is automatically turned off when the port pin is configured as an output. The pull-ups are disabled on any device Reset.
CLRF
LATE
MOVLW
03h
MOVWF
TRISE
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TABLE 10-11:
Pin Name RE0/AD8/RD/ P2D
PORTE FUNCTIONS
Function RE0 AD8(3) RD P2D TRIS Setting 0 1 x x 1 0 I/O O I O I I O I/O Type DIG ST DIG TTL TTL DIG LATE<0> data output. PORTE<0> data input. External memory interface, address/data bit 8 output.(2) External memory interface, data bit 8 input.(2) Parallel Slave Port read enable control input. ECCP2 Enhanced PWM output, channel D; takes priority over port and PSP data. May be configured for tri-state during Enhanced PWM shutdown events. LATE<1> data output. PORTE<1> data input. External memory interface, address/data bit 9 output.(2) External memory interface, data bit 9 input.(2) Parallel Slave Port write enable control input. ECCP2 Enhanced PWM output, channel C; takes priority over port and PSP data. May be configured for tri-state during Enhanced PWM shutdown events. LATE<2> data output. PORTE<2> data input. External memory interface, address/data bit 10 output.(2) External memory interface, data bit 10 input.(2) Parallel Slave Port chip select control input. ECCP2 Enhanced PWM output, channel B; takes priority over port and PSP data. May be configured for tri-state during Enhanced PWM shutdown events. LATE<3> data output. PORTE<3> data input. External memory interface, address/data bit 11 output.(2) External memory interface, data bit 11 input.(2) ECCP3 Enhanced PWM output, channel C; takes priority over port and PSP data. May be configured for tri-state during Enhanced PWM shutdown events. LATE<4> data output. PORTE<4> data input. External memory interface, address/data bit 12 output.(2) External memory interface, data bit 12 input.(2) ECCP3 Enhanced PWM output, channel B; takes priority over port and PSP data. May be configured for tri-state during Enhanced PWM shutdown events. LATE<5> data output. PORTE<5> data input. External memory interface, address/data bit 13 output.(2) External memory interface, data bit 13 input.(2) ECCP1 Enhanced PWM output, channel C; takes priority over port and PSP data. May be configured for tri-state during Enhanced PWM shutdown events. Description
RE1/AD9/WR/ P2C
RE1 AD9(3) WR P2C
0 1 x x 1 0
O I O I I O
DIG ST DIG TTL TTL DIG
RE2/AD10/CS/ P2B
RE2 AD10(3) CS P2B
0 1 x x 1 0
O I O I I O
DIG ST DIG TTL TTL DIG
RE3/AD11/ P3C
RE3 AD11
(3)
0 1 x x 0
O I O I O
DIG ST DIG TTL DIG
P3C(1)
RE4/AD12/ P3B
RE4 AD12(3) P3B(1)
0 1 x x 0
O I O I O
DIG ST DIG TTL DIG
RE5/AD13/ P1C
RE5 AD13(3) P1C
(1)
0 1 x x 0
O I O I O
DIG ST DIG TTL DIG
Legend: Note 1: 2: 3: 4:
PWR = Power Supply, O = Output, I = Input, ANA = Analog Signal, DIG = Digital Output, ST = Schmitt Buffer Input, TTL = TTL Buffer Input, x = Don't care (TRIS bit does not affect port direction or is overridden for this option). Default assignments for P1B/P1C and P3B/P3C when ECCPMX configuration bit is set (80-pin devices only). External memory interface I/O takes priority over all other digital and PSP I/O. Available on 80-pin devices only. Alternate assignment for ECCP2/P2A when CCP2MX configuration bit is cleared (all devices in Microcontroller mode).
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TABLE 10-11:
Pin Name RE6/AD14/ P1B
PORTE FUNCTIONS (CONTINUED)
Function RE6 AD14
(3)
TRIS Setting 0 1 x x 0
I/O O I O I O
I/O Type DIG ST DIG TTL DIG LATE<6> data output. PORTE<6> data input.
Description
External memory interface, address/data bit 14 output.(2) External memory interface, data bit 14 input.(2) ECCP1 Enhanced PWM output, channel B; takes priority over port and PSP data. May be configured for tri-state during Enhanced PWM shutdown events. LATE<7> data output. PORTE<7> data input. External memory interface, address/data bit 15 output.(2) External memory interface, data bit 15 input.(2) CCP2 compare output and CCP2 PWM output; takes priority over port data. CCP2 capture input. ECCP2 Enhanced PWM output, channel A; takes priority over port and PSP data. May be configured for tri-state during Enhanced PWM shutdown events.
P1B(1)
RE7/AD15/ ECCP2/P2A
RE7 AD15(3) ECCP2(4)
0 1 x x 0 1
O I O I O I O
DIG ST DIG TTL DIG ST DIG
P2A(4)
0
Legend: Note 1: 2: 3: 4:
PWR = Power Supply, O = Output, I = Input, ANA = Analog Signal, DIG = Digital Output, ST = Schmitt Buffer Input, TTL = TTL Buffer Input, x = Don't care (TRIS bit does not affect port direction or is overridden for this option). Default assignments for P1B/P1C and P3B/P3C when ECCPMX configuration bit is set (80-pin devices only). External memory interface I/O takes priority over all other digital and PSP I/O. Available on 80-pin devices only. Alternate assignment for ECCP2/P2A when CCP2MX configuration bit is cleared (all devices in Microcontroller mode).
TABLE 10-12: SUMMARY OF REGISTERS ASSOCIATED WITH PORTE
Name PORTE LATE TRISE PORTG Bit 7 RE7 LATE7 TRISE7 RDPU Bit 6 RE6 LATE6 TRISE6 REPU Bit 5 RE5 LATE5 TRISE5 RJPU(1) Bit 4 RE4 LATE4 TRISE4 RG4 Bit 3 RE3 LATE3 TRISE3 RG3 Bit 2 RE2 LATE2 TRISE2 RG2 Bit 1 RE1 LATE1 TRISE1 RG1 Bit 0 RE0 LATE0 TRISE0 RG0 Reset Values on page 52 52 52 52
Legend: -- = unimplemented, read as `0'. Shaded cells are not used by PORTE. Note 1: Unimplemented on 64-pin devices; read as `0'.
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10.7 PORTF, LATF and TRISF Registers
PORTF is a 7-bit wide, bidirectional port. The corresponding data direction register is TRISF. Setting a TRISF bit (= 1) will make the corresponding PORTF pin an input (i.e., put the corresponding output driver in a high-impedance mode). Clearing a TRISF bit (= 0) will make the corresponding PORTF pin an output (i.e., put the contents of the output latch on the selected pin). Only pin 7 of PORTF has no analog input; it is the only pin that can tolerate voltages up to 5.5V. The Data Latch register (LATF) is also memory mapped. Read-modify-write operations on the LATF register read and write the latched output value for PORTF. All pins on PORTF are implemented with Schmitt Trigger input buffers. Each pin is individually configurable as an input or output. PORTF is multiplexed with several analog peripheral functions, including the A/D converter and comparator inputs, as well as the comparator outputs. Pins RF2 through RF6 may be used as comparator inputs or outputs by setting the appropriate bits in the CMCON register. To use RF3:RF6 as digital inputs, it is also necessary to turn off the comparators. Note 1: On device Resets, pins RF6:RF1 are configured as analog inputs and are read as `0'. 2: To configure PORTF as digital I/O, turn off comparators and set ADCON1 value.
EXAMPLE 10-6:
CLRF PORTF ; ; ; ; ; ; ; ;
INITIALIZING PORTF
Initialize PORTF by clearing output data latches Alternate method to clear output data latches
CLRF
LATF
MOVLW MOVWF MOVLW MOVWF MOVLW
MOVWF
07h CMCON Turn off comparators 0Fh; ADCON1 ; Set PORTF as digital I/O 0CEh ; Value used to ; initialize data ; direction TRISF ; Set RF3:RF1 as inputs ; RF5:RF4 as outputs ; RF7:RF6 as inputs
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TABLE 10-13: PORTF FUNCTIONS
Pin Name RF1/AN6/ C2OUT Function RF1 AN6 C2OUT RF2/AN7/ C1OUT RF2 AN7 C1OUT RF3/AN8 RF3 AN8 RF4/AN9 RF4 AN9 RF5/AN10/ CVREF RF5 TRIS Setting 0 1 1 0 0 1 1 0 0 1 1 0 1 1 0 1 AN10 CVREF RF6/AN11 RF6 AN11 RF7/SS1 RF7 SS1 Legend: 1 x 0 1 1 0 1 1 I/O O I I O O I I O O I I O I I O I I O O I I O I I I/O Type DIG ST ANA DIG DIG ST ANA TTL DIG ST ANA DIG ST ANA DIG ST ANA ANA DIG ST ANA DIG ST TTL Description LATF<1> data output; not affected by analog input. PORTF<1> data input; disabled when analog input enabled. A/D input channel 6. Default configuration on POR. Comparator 2 output; takes priority over port data. LATF<2> data output; not affected by analog input. PORTF<2> data input; disabled when analog input enabled. A/D input channel 7. Default configuration on POR. Comparator 1 output; takes priority over port data. LATF<3> data output; not affected by analog input. PORTF<3> data input; disabled when analog input enabled. A/D input channel 8 and Comparator C2+ input. Default input configuration on POR; not affected by analog output. LATF<4> data output; not affected by analog input. PORTF<4> data input; disabled when analog input enabled. A/D input channel 9 and Comparator C2- input. Default input configuration on POR; does not affect digital output. LATF<5> data output; not affected by analog input. Disabled when CVREF output enabled. PORTF<5> data input; disabled when analog input enabled. Disabled when CVREF output enabled. A/D input channel 10 and Comparator C1+ input. Default input configuration on POR. Comparator voltage reference output. Enabling this feature disables digital I/O. LATF<6> data output; not affected by analog input. PORTF<6> data input; disabled when analog input enabled. A/D input channel 11 and Comparator C1- input. Default input configuration on POR; does not affect digital output. LATF<7> data output. PORTF<7> data input. Slave select input for SSP (MSSP1 module).
PWR = Power Supply, O = Output, I = Input, ANA = Analog Signal, DIG = Digital Output, ST = Schmitt Buffer Input, TTL = TTL Buffer Input, x = Don't care (TRIS bit does not affect port direction or is overridden for this option).
TABLE 10-14: SUMMARY OF REGISTERS ASSOCIATED WITH PORTF
Name PORTF LATF TRISF ADCON1 CMCON CVRCON Bit 7 RF7 LATF7 TRISF7 -- C2OUT CVREN Bit 6 RF6 LATF6 TRISF6 -- C1OUT CVROE Bit 5 RF5 LATF5 TRISF5 VCFG1 C2INV CVRR Bit 4 RF4 LATF4 TRISF4 VCFG0 C1INV CVRSS Bit 3 RF3 LATF3 TRISF3 PCFG3 CIS CVR3 Bit 2 RF2 LATF2 TRISF2 PCFG2 CM2 CVR2 Bit 1 RF1 LATF1 TRISF1 PCFG1 CM1 CVR1 Bit 0 -- -- -- PCFG0 CM0 CVR0 Reset Values on page 52 52 52 50 51 51
Legend: -- = unimplemented, read as `0'. Shaded cells are not used by PORTF.
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10.8 PORTG, TRISG and LATG Registers
Although the port is only five bits wide, PORTG<7:5> bits are still implemented. These are used to control the weak pull-ups on the I/O ports associated with the external memory bus (PORTD, PORTE and PORTJ). Setting these bits enables the pull-ups. Since these are control bits and are not associated with port I/O, the corresponding TRISG and LATG bits are not implemented.
PORTG is a 5-bit wide, bidirectional port. The corresponding data direction register is TRISG. Setting a TRISG bit (= 1) will make the corresponding PORTG pin an input (i.e., put the corresponding output driver in a high-impedance mode). Clearing a TRISG bit (= 0) will make the corresponding PORTG pin an output (i.e., put the contents of the output latch on the selected pin). All pins on PORTG are digital only and tolerate voltages up to 5.5V. The Data Latch register (LATG) is also memory mapped. Read-modify-write operations on the LATG register read and write the latched output value for PORTG. PORTG is multiplexed with EUSART2 functions (Table 10-15). PORTG pins have Schmitt Trigger input buffers. When enabling peripheral functions, care should be taken in defining TRIS bits for each PORTG pin. Some peripherals override the TRIS bit to make a pin an output, while other peripherals override the TRIS bit to make a pin an input. The user should refer to the corresponding peripheral section for the correct TRIS bit settings. The pin override value is not loaded into the TRIS register. This allows read-modify-write of the TRIS register without concern due to peripheral overrides.
EXAMPLE 10-7:
CLRF PORTG ; ; ; ; ; ; ; ; ; ; ; ;
INITIALIZING PORTG
Initialize PORTG by clearing output data latches Alternate method to clear output data latches Value used to initialize data direction Set RG1:RG0 as outputs RG2 as input RG4:RG3 as inputs
CLRF
LATG
MOVLW
04h
MOVWF
TRISG
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TABLE 10-15: PORTG FUNCTIONS
Pin Name RG0/ECCP3/ P3A Function RG0 ECCP3 P3A 0 TRIS Setting 0 1 I/O O I O I O I/O Type DIG ST DIG ST DIG LATG<0> data output. PORTG<0> data input. CCP3 Compare and PWM output; takes priority over port data. CCP3 Capture input. ECCP3 Enhanced PWM output, channel A; takes priority over port and PSP data. May be configured for tri-state during Enhanced PWM shutdown events. LATG<1> data output. PORTG<1> data input. Synchronous serial data output (EUSART2 module); takes priority over port data. Synchronous serial data input (EUSART2 module). User must configure as an input. Synchronous serial clock input (EUSART2 module). LATG<2> data output. PORTG<2> data input. Asynchronous serial receive data input (EUSART2 module). Synchronous serial data output (EUSART2 module); takes priority over port data. Synchronous serial data input (EUSART2 module). User must configure as an input. LATG<3> data output. PORTG<3> data input. CCP4 Compare output and CCP4 PWM output; takes priority over port data. CCP4 Capture input. ECCP3 Enhanced PWM output, channel D; takes priority over port and PSP data. May be configured for tri-state during Enhanced PWM shutdown events. LATG<4> data output. PORTG<4> data input. CCP5 Compare output and CCP5 PWM output; takes priority over port data. CCP5 Capture input. ECCP1 Enhanced PWM output, channel D; takes priority over port and PSP data. May be configured for tri-state during Enhanced PWM shutdown events. Description
RG1/TX2/CK2
R21 TX2 CK2
0 1 1 1 1
O I O O I O I I O I O I O I O
DIG ST DIG DIG ST DIG ST ST DIG ST DIG ST DIG ST DIG
RG2/RX2/DT2
RG2 RX2 DT2
0 1 1 1 1
RG3/CCP4/ P3D
RG3 CCP4 P3D
0 1 0 1 0
RG4/CCP5/ P1D
RG4 CCP5 P1D
0 1 0 1 0
O I O I O
DIG ST DIG ST DIG
Legend:
PWR = Power Supply, O = Output, I = Input, ANA = Analog Signal, DIG = Digital Output, ST = Schmitt Buffer Input, TTL = TTL Buffer Input, x = Don't care (TRIS bit does not affect port direction or is overridden for this option).
TABLE 10-16: SUMMARY OF REGISTERS ASSOCIATED WITH PORTG
Name PORTG LATG TRISG Bit 7 RDPU -- -- Bit 6 REPU -- -- Bit 5 RJPU(1) -- -- Bit 4 RG4 LATG4 TRISG4 Bit 3 RG3 LATG3 TRISG3 Bit 2 RG2 LATG2 TRISG2 Bit 1 RG1 LATG1 TRISG1 Bit 0 RG0 LATG0 TRISG0 Reset Values on page 52 52 52
Legend: -- = unimplemented, read as `0'. Shaded cells are not used by PORTG. Note 1: Unimplemented on 64-pin devices; read as `0'.
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10.9
Note:
PORTH, LATH and TRISH Registers
PORTH is available only on 80-pin devices.
When the external memory interface is enabled, four of the PORTH pins function as the high-order address lines for the interface. The address output from the interface takes priority over other digital I/O. The corresponding TRISH bits are also overridden. PORTH pins RH4 through RH7 are multiplexed with analog converter inputs. The operation of these pins as analog inputs is selected by clearing or setting the PCFG3:PCFG0 control bits in the ADCON1 register. PORTH can also be configured as the alternate Enhanced PWM output channels B and C for the ECCP1 and ECCP3 modules. This is done by clearing the ECCPMX configuration bit.
PORTH is an 8-bit wide, bidirectional I/O port. The corresponding data direction register is TRISH. Setting a TRISH bit (= 1) will make the corresponding PORTH pin an input (i.e., put the corresponding output driver in a high-impedance mode). Clearing a TRISH bit (= 0) will make the corresponding PORTH pin an output (i.e., put the contents of the output latch on the selected pin). PORTH pins <3:0> are digital only and tolerate voltages up to 5.5V. The Data Latch register (LATH) is also memory mapped. Read-modify-write operations on the LATH register read and write the latched output value for PORTH. All pins on PORTH are implemented with Schmitt Trigger input buffers. Each pin is individually configurable as an input or output.
EXAMPLE 10-8:
CLRF PORTH
INITIALIZING PORTH
; ; ; ; ; ; ; ; ; ; ; ; ; ; Initialize PORTH by clearing output data latches Alternate method to clear output data latches Configure PORTH as digital I/O Value used to initialize data direction Set RH3:RH0 as inputs RH5:RH4 as outputs RH7:RH6 as inputs
CLRF
LATH
MOVLW MOVWF MOVLW
0Fh ADCON1 0CFh
MOVWF
TRISH
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TABLE 10-17: PORTH FUNCTIONS
Pin Name RH0/A16 Function RH0 A16 RH1/A17 RH1 A17 RH2/A18 RH2 A18 RH3/A19 RH3 A19 RH4/AN12/P3C RH4 AN12 P3C(1) RH5/AN13/P3B RH5 AN13 P3B(1) RH6/AN14/P1C RH6 AN14 P1C(1) RH7/AN15/P1B RH7 AN15 P1B(1) Legend: Note 1: 0 0 0 1 0 0 1 0 0 1 TRIS Setting 0 1 x 0 1 x 0 1 x 0 1 x 0 1 I/O O I O O I O O I O O I O O I I O O I I O O I I O O I I O I/O Type DIG ST DIG DIG ST DIG DIG ST DIG DIG ST DIG DIG ST ANA DIG DIG ST ANA DIG DIG ST ANA DIG DIG ST ANA DIG LATH<0> data output. PORTH<0> data input. External memory interface, address line 16. Takes priority over port data. LATH<1> data output. PORTH<1> data input. External memory interface, address line 17. Takes priority over port data. LATH<2> data output. PORTH<2> data input. External memory interface, address line 18. Takes priority over port data. LATH<3> data output. PORTH<3> data input. External memory interface, address line 19. Takes priority over port data. LATH<4> data output. PORTH<4> data input. A/D input channel 12. Default input configuration on POR; does not affect digital output. ECCP3 Enhanced PWM output, channel C; takes priority over port and PSP data. May be configured for tri-state during Enhanced PWM shutdown events. LATH<5> data output. PORTH<5> data input. A/D input channel 13. Default input configuration on POR; does not affect digital output. ECCP3 Enhanced PWM output, channel B; takes priority over port and PSP data. May be configured for tri-state during Enhanced PWM shutdown events. LATH<6> data output. PORTH<6> data input. A/D input channel 14. Default input configuration on POR; does not affect digital output. ECCP1 Enhanced PWM output, channel C; takes priority over port and PSP data. May be configured for tri-state during Enhanced PWM shutdown events. LATH<7> data output. PORTH<7> data input. A/D input channel 15. Default input configuration on POR; does not affect digital output. ECCP1 Enhanced PWM output, channel B; takes priority over port and PSP data. May be configured for tri-state during Enhanced PWM shutdown events. Description
PWR = Power Supply, O = Output, I = Input, ANA = Analog Signal, DIG = Digital Output, ST = Schmitt Buffer Input, TTL = TTL Buffer Input, x = Don't care (TRIS bit does not affect port direction or is overridden for this option). Alternate assignments for P1B/P1C and P3B/P3C when ECCPMX configuration bit is cleared. Default assignments are PORTE<6:3>.
TABLE 10-18: SUMMARY OF REGISTERS ASSOCIATED WITH PORTH
Name PORTH LATH TRISH Bit 7 RH7 LATH7 TRISH7 Bit 6 RH6 LATH6 TRISH6 Bit 5 RH5 LATH5 TRISH5 Bit 4 RH4 LATH4 TRISH4 Bit 3 RH3 LATH3 TRISH3 Bit 2 RH2 LATH2 TRISH2 Bit 1 RH1 LATH1 TRISH1 Bit 0 RH0 LATH0 TRISH0 Reset Values on page 52 52 52
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10.10 PORTJ, TRISJ and LATJ Registers
Note: PORTJ is available only on 80-pin devices. When the external memory interface is enabled, all of the PORTJ pins function as control outputs for the interface. This occurs automatically when the interface is enabled by clearing the EBDIS control bit (MEMCON<7>). The TRISJ bits are also overridden. Each of the PORTJ pins has a weak internal pull-up. The pull-ups are provided to keep the inputs at a known state for the external memory interface while powering up. A single control bit can turn off all the pull-ups. This is performed by clearing bit RJPU (PORTG<5>). The weak pull-up is automatically turned off when the port pin is configured as an output. The pull-ups are disabled on any device Reset.
PORTJ is an 8-bit wide, bidirectional port. The corresponding data direction register is TRISJ. Setting a TRISJ bit (= 1) will make the corresponding PORTJ pin an input (i.e., put the corresponding output driver in a high-impedance mode). Clearing a TRISJ bit (= 0) will make the corresponding PORTJ pin an output (i.e., put the contents of the output latch on the selected pin). All pins on PORTJ are digital only and tolerate voltages up to 5.5V. The Data Latch register (LATJ) is also memory mapped. Read-modify-write operations on the LATJ register read and write the latched output value for PORTJ. All pins on PORTJ are implemented with Schmitt Trigger input buffers. Each pin is individually configurable as an input or output. Note: These pins are configured as digital inputs on any device Reset.
EXAMPLE 10-9:
CLRF PORTJ ; ; ; ; ; ; ; ; ; ; ; ;
INITIALIZING PORTJ
Initialize PORTG by clearing output data latches Alternate method to clear output data latches Value used to initialize data direction Set RJ3:RJ0 as inputs RJ5:RJ4 as output RJ7:RJ6 as inputs
CLRF
LATJ
MOVLW
0CFh
MOVWF
TRISJ
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TABLE 10-19: PORTJ FUNCTIONS
Pin Name RJ0/ALE Function RJ0 ALE RJ1/OE RJ1 OE RJ2/WRL RJ2 WRL RJ3/WRH RJ3 WRH RJ4/BA0 RJ4 BA0 RJ5/CE RJ5 CE RJ6/LB RJ6 LB RJ7/UB RJ7 UB Legend: TRIS Setting I/O O I O O I O O I O O I O O I O O I O O I O O I O I/O Type DIG ST DIG DIG ST DIG DIG ST DIG DIG ST DIG DIG ST DIG DIG ST DIG DIG ST DIG DIG ST DIG LATJ<0> data output. PORTJ<0> data input. External memory interface address latch enable control output; takes priority over digital I/O. LATJ<1> data output. PORTJ<1> data input. External memory interface output enable control output; takes priority over digital I/O. LATJ<2> data output. PORTJ<2> data input. External memory bus write low byte control; takes priority over digital I/O. LATJ<3> data output. PORTJ<3> data input. External memory interface write high byte control output; takes priority over digital I/O. LATJ<4> data output. PORTJ<4> data input. External memory interface byte address 0 control output; takes priority over digital I/O. LATJ<5> data output. PORTJ<5> data input. External memory interface chip enable control output; takes priority over digital I/O. LATJ<6> data output. PORTJ<6> data input. External memory interface lower byte enable control output; takes priority over digital I/O. LATJ<7> data output. PORTJ<7> data input. External memory interface upper byte enable control output; takes priority over digital I/O. Description
0
1 x 0 1 x 0 1 x 0 1 x 0 1 x 0 1 x 0 1 x 0 1 x
PWR = Power Supply, O = Output, I = Input, ANA = Analog Signal, DIG = Digital Output, ST = Schmitt Buffer Input, TTL = TTL Buffer Input, x = Don't care (TRIS bit does not affect port direction or is overridden for this option).
TABLE 10-20: SUMMARY OF REGISTERS ASSOCIATED WITH PORTJ
Name PORTJ LATJ TRISJ PORTG Bit 7 RJ7 LATJ7 TRISJ7 RDPU Bit 6 RJ6 LATJ6 TRISJ6 REPU Bit 5 RJ5 LATJ5 TRISJ5 RJPU Bit 4 RJ4 LATJ4 TRISJ4 RG4 Bit 3 RJ3 LATJ3 TRISJ3 RG3 Bit 2 RJ2 LATJ2 TRISJ2 RG2 Bit 1 RJ1 LATJ1 TRISJ1 RG1 Bit 0 RJ0 LATJ0 TRISJ0 RG0 Reset Values on page 52 52 52 52
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10.11 Parallel Slave Port
PORTD can also function as an 8-bit wide Parallel Slave Port, or microprocessor port, when control bit PSPMODE (PSPCON<4>) is set. It is asynchronously readable and writable by the external world through RD control input pin, RE0/RD and WR control input pin, RE1/WR. Note: For 80-pin devices, the Parallel Slave Port is available only in Microcontroller mode.
FIGURE 10-2:
PORTD AND PORTE BLOCK DIAGRAM (PARALLEL SLAVE PORT)
Data Bus
D Q
WR LATD or PORTD
CK
RDx pin TTL
Data Latch Q D EN EN TRIS Latch
The PSP can directly interface to an 8-bit microprocessor data bus. The external microprocessor can read or write the PORTD latch as an 8-bit latch. Setting bit PSPMODE enables port pin RE0/RD to be the RD input, RE1/WR to be the WR input and RE2/CS to be the CS (Chip Select) input. For this functionality, the corresponding data direction bits of the TRISE register (TRISE<2:0>) must be configured as inputs (set). A write to the PSP occurs when both the CS and WR lines are first detected low and ends when either are detected high. The PSPIF and IBF flag bits are both set when the write ends. A read from the PSP occurs when both the CS and RD lines are first detected low. The data in PORTD is read out and the OBF bit is set. If the user writes new data to PORTD to set OBF, the data is immediately read out; however, the OBF bit is not set. When either the CS or RD lines are detected high, the PORTD pins return to the input state and the PSPIF bit is set. User applications should wait for PSPIF to be set before servicing the PSP; when this happens, the IBF and OBF bits can be polled and the appropriate action taken. The timing for the control signals in Write and Read modes is shown in Figure 10-3 and Figure 10-4, respectively.
RD PORTD
RD LATD
One bit of PORTD Set Interrupt Flag PSPIF (PIR1<7>)
Read
TTL
RD
Chip Select TTL Write TTL CS
WR
Note: I/O pin has protection diodes to VDD and VSS.
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REGISTER 10-1: PSPCON: PARALLEL SLAVE PORT CONTROL REGISTER
R-0 IBF bit 7 bit 7 IBF: Input Buffer Full Status bit 1 = A word has been received and is waiting to be read by the CPU 0 = No word has been received OBF: Output Buffer Full Status bit 1 = The output buffer still holds a previously written word 0 = The output buffer has been read IBOV: Input Buffer Overflow Detect bit 1 = A write occurred when a previously input word has not been read (must be cleared in software) 0 = No overflow occurred PSPMODE: Parallel Slave Port Mode Select bit 1 = Parallel Slave Port mode 0 = General Purpose I/O mode Unimplemented: Read as `0' Legend: R = Readable bit -n = Value at POR W = Writable bit '1' = Bit is set U = Unimplemented bit, read as `0' '0' = Bit is cleared x = Bit is unknown R-0 OBF R/W-0 IBOV R/W-0 PSPMODE U-0 -- U-0 -- U-0 -- U-0 -- bit 0
bit 6
bit 5
bit 4
bit 3-0
FIGURE 10-3:
PARALLEL SLAVE PORT WRITE WAVEFORMS
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
CS WR RD PORTD<7:0> IBF OBF PSPIF
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FIGURE 10-4: PARALLEL SLAVE PORT READ WAVEFORMS
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
CS WR RD PORTD<7:0> IBF OBF PSPIF
TABLE 10-21: REGISTERS ASSOCIATED WITH PARALLEL SLAVE PORT
Name PORTD LATD TRISD PORTE LATE TRISE PSPCON INTCON PIR1 PIE1 IPR1 Bit 7 RD7 LATD7 TRISD7 RE7 LATE7 TRISE7 IBF PSPIF PSPIE PSPIP Bit 6 RD6 LATD6 TRISD6 RE6 LATE6 TRISE6 OBF ADIF ADIE ADIP Bit 5 RD5 LATD5 TRISD5 RE5 LATE5 TRISE5 IBOV TMR0IE RC1IF RC1IE RC1IP Bit 4 RD4 LATD4 TRISD4 RE4 LATE4 TRISE4 PSPMODE INT0IE TX1IF TX1IE TX1IP Bit 3 RD3 LATD3 TRISD3 RE3 LATE3 TRISE3 -- RBIE SSP1IF SSP1IE SSP1IP Bit 2 RD2 LATD2 TRISD2 RE2 LATE2 TRISE2 -- TMR0IF CCP1IF CCP1IE CCP1IP Bit 1 RD1 LATD1 TRISD1 RE1 LATE1 TRISE1 -- INT0IF TMR2IF TMR2IE TMR2IP Bit 0 RD0 LATD0 TRISD0 RE0 LATE0 TRISE0 -- RBIF TMR1IF TMR1IE TMR1IP Reset Values on page 52 52 52 52 52 52 51 49 51 51 51
GIE/GIEH PEIE/GIEL
Legend: -- = unimplemented, read as `0'. Shaded cells are not used by the Parallel Slave Port.
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11.0 TIMER0 MODULE
The Timer0 module incorporates the following features: * Software selectable operation as a timer or counter in both 8-bit or 16-bit modes * Readable and writable registers * Dedicated 8-bit, software programmable prescaler * Selectable clock source (internal or external) * Edge select for external clock * Interrupt-on-overflow The T0CON register (Register 11-1) controls all aspects of the module's operation, including the prescale selection. It is both readable and writable. A simplified block diagram of the Timer0 module in 8-bit mode is shown in Figure 11-1. Figure 11-2 shows a simplified block diagram of the Timer0 module in 16-bit mode.
REGISTER 11-1:
T0CON: TIMER0 CONTROL REGISTER
R/W-1 TMR0ON bit 7 R/W-1 T08BIT R/W-1 T0CS R/W-1 T0SE R/W-1 PSA R/W-1 T0PS2 R/W-1 T0PS1 R/W-1 T0PS0 bit 0
bit 7
TMR0ON: Timer0 On/Off Control bit 1 = Enables Timer0 0 = Stops Timer0 T08BIT: Timer0 8-bit/16-bit Control bit 1 = Timer0 is configured as an 8-bit timer/counter 0 = Timer0 is configured as a 16-bit timer/counter T0CS: Timer0 Clock Source Select bit 1 = Transition on T0CKI pin 0 = Internal instruction cycle clock (CLKO) T0SE: Timer0 Source Edge Select bit 1 = Increment on high-to-low transition on T0CKI pin 0 = Increment on low-to-high transition on T0CKI pin PSA: Timer0 Prescaler Assignment bit 1 = TImer0 prescaler is not assigned. Timer0 clock input bypasses prescaler. 0 = Timer0 prescaler is assigned. Timer0 clock input comes from prescaler output. T0PS2:T0PS0: Timer0 Prescaler Select bits 111 = 1:256 Prescale value 110 = 1:128 Prescale value 101 = 1:64 Prescale value 100 = 1:32 Prescale value 011 = 1:16 Prescale value 010 = 1:8 Prescale value 001 = 1:4 Prescale value 000 = 1:2 Prescale value Legend: R = Readable bit -n = Value at POR W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown
bit 6
bit 5
bit 4
bit 3
bit 2-0
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11.1 Timer0 Operation
Timer0 can operate as either a timer or a counter; the mode is selected with the T0CS bit (T0CON<5>). In Timer mode (T0CS = 0), the module increments on every clock by default unless a different prescaler value is selected (see Section 11.3 "Prescaler"). If the TMR0 register is written to, the increment is inhibited for the following two instruction cycles. The user can work around this by writing an adjusted value to the TMR0 register. The Counter mode is selected by setting the T0CS bit (= 1). In this mode, Timer0 increments either on every rising or falling edge of pin RA4/T0CKI. The incrementing edge is determined by the Timer0 Source Edge Select bit, T0SE (T0CON<4>); clearing this bit selects the rising edge. Restrictions on the external clock input are discussed below. An external clock source can be used to drive Timer0; however, it must meet certain requirements to ensure that the external clock can be synchronized with the internal phase clock (TOSC). There is a delay between synchronization and the onset of incrementing the timer/counter.
11.2
Timer0 Reads and Writes in 16-Bit Mode
TMR0H is not the actual high byte of Timer0 in 16-bit mode. It is actually a buffered version of the real high byte of Timer0 which is not directly readable nor writable (refer to Figure 11-2). TMR0H is updated with the contents of the high byte of Timer0 during a read of TMR0L. This provides the ability to read all 16 bits of Timer0 without having to verify that the read of the high and low byte were valid, due to a rollover between successive reads of the high and low byte. Similarly, a write to the high byte of Timer0 must also take place through the TMR0H Buffer register. The high byte is updated with the contents of TMR0H when a write occurs to TMR0L. This allows all 16 bits of Timer0 to be updated at once.
FIGURE 11-1:
TIMER0 BLOCK DIAGRAM (8-BIT MODE)
FOSC/4 0 1 1 Sync with Internal Clocks (2 TCY Delay) 8 8 Internal Data Bus TMR0L Set TMR0IF on Overflow
T0CKI pin T0SE T0CS T0PS2:T0PS0 PSA
Programmable Prescaler 3
0
Note:
Upon Reset, Timer0 is enabled in 8-bit mode with clock input from T0CKI max. prescale.
FIGURE 11-2:
FOSC/4
TIMER0 BLOCK DIAGRAM (16-BIT MODE)
0 1 1 Sync with Internal Clocks (2 TCY Delay) Read TMR0L Write TMR0L 8 8 TMR0H 8 8 Internal Data Bus TMR0L TMR0 High Byte 8 Set TMR0IF on Overflow
T0CKI pin T0SE T0CS T0PS2:T0PS0 PSA
Programmable Prescaler 3
0
Note:
Upon Reset, Timer0 is enabled in 8-bit mode with clock input from T0CKI max. prescale.
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11.3 Prescaler
11.3.1
An 8-bit counter is available as a prescaler for the Timer0 module. The prescaler is not directly readable or writable. Its value is set by the PSA and T0PS2:T0PS0 bits (T0CON<2:0>) which determine the prescaler assignment and prescale ratio. Clearing the PSA bit assigns the prescaler to the Timer0 module. When it is assigned, prescale values from 1:2 through 1:256 in power-of-2 increments are selectable. When assigned to the Timer0 module, all instructions writing to the TMR0 register (e.g., CLRF TMR0, MOVWF TMR0, BSF TMR0, etc.) clear the prescaler count. Note: Writing to TMR0 when the prescaler is assigned to Timer0 will clear the prescaler count but will not change the prescaler assignment.
SWITCHING PRESCALER ASSIGNMENT
The prescaler assignment is fully under software control and can be changed "on-the-fly" during program execution.
11.4
Timer0 Interrupt
The TMR0 interrupt is generated when the TMR0 register overflows from FFh to 00h in 8-bit mode, or from FFFFh to 0000h in 16-bit mode. This overflow sets the TMR0IF flag bit. The interrupt can be masked by clearing the TMR0IE bit (INTCON<5>). Before re-enabling the interrupt, the TMR0IF bit must be cleared in software by the Interrupt Service Routine. Since Timer0 is shut down in Sleep mode, the TMR0 interrupt cannot awaken the processor from Sleep.
TABLE 11-1:
Name TMR0L TMR0H INTCON T0CON TRISA
REGISTERS ASSOCIATED WITH TIMER0
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Reset Values on page 50 50 INT0IE T0SE TRISA4 RBIE PSA TRISA3 TMR0IF T0PS2 TRISA2 INT0IF T0PS1 TRISA1 RBIF T0PS0 TRISA0 49 50 52 T0CS TRISA5
Timer0 Register Low Byte Timer0 Register High Byte GIE/GIEH PEIE/GIEL TMR0IE TMR0ON -- T08BIT --
Legend: -- = unimplemented, read as `0'. Shaded cells are not used by Timer0.
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NOTES:
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12.0 TIMER1 MODULE
The Timer1 timer/counter module incorporates these features: * Software selectable operation as a 16-bit timer or counter * Readable and writable 8-bit registers (TMR1H and TMR1L) * Selectable clock source (internal or external) with device clock or Timer1 oscillator internal options * Interrupt-on-overflow * Reset on CCP Special Event Trigger * Device clock status flag (T1RUN) A simplified block diagram of the Timer1 module is shown in Figure 12-1. A block diagram of the module's operation in Read/Write mode is shown in Figure 12-2. The module incorporates its own low-power oscillator to provide an additional clocking option. The Timer1 oscillator can also be used as a low-power clock source for the microcontroller in power-managed operation. Timer1 can also be used to provide Real-Time Clock (RTC) functionality to applications with only a minimal addition of external components and code overhead. Timer1 is controlled through the T1CON Control register (Register 12-1). It also contains the Timer1 Oscillator Enable bit (T1OSCEN). Timer1 can be enabled or disabled by setting or clearing control bit, TMR1ON (T1CON<0>).
REGISTER 12-1:
T1CON: TIMER1 CONTROL REGISTER
R/W-0 RD16 bit 7 R-0 T1RUN R/W-0 T1CKPS1 R/W-0 T1CKPS0 R/W-0 T1OSCEN R/W-0 T1SYNC R/W-0 TMR1CS R/W-0 TMR1ON bit 0
bit 7
RD16: 16-Bit Read/Write Mode Enable bit 1 = Enables register read/write of TImer1 in one 16-bit operation 0 = Enables register read/write of Timer1 in two 8-bit operations T1RUN: Timer1 System Clock Status bit 1 = Device clock is derived from Timer1 oscillator 0 = Device clock is derived from another source T1CKPS1:T1CKPS0: Timer1 Input Clock Prescale Select bits 11 = 1:8 Prescale value 10 = 1:4 Prescale value 01 = 1:2 Prescale value 00 = 1:1 Prescale value T1OSCEN: Timer1 Oscillator Enable bit 1 = Timer1 oscillator is enabled 0 = Timer1 oscillator is shut off The oscillator inverter and feedback resistor are turned off to eliminate power drain. T1SYNC: Timer1 External Clock Input Synchronization Select bit When TMR1CS = 1: 1 = Do not synchronize external clock input 0 = Synchronize external clock input When TMR1CS = 0: This bit is ignored. Timer1 uses the internal clock when TMR1CS = 0. TMR1CS: Timer1 Clock Source Select bit 1 = External clock from pin RC0/T1OSO/T13CKI (on the rising edge) 0 = Internal clock (FOSC/4) TMR1ON: Timer1 On bit 1 = Enables Timer1 0 = Stops Timer1 Legend: R = Readable bit -n = Value at POR
bit 6
bit 5-4
bit 3
bit 2
bit 1
bit 0
W = Writable bit `1' = Bit is set
U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown
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12.1 Timer1 Operation
Timer1 can operate in one of these modes: * Timer * Synchronous Counter * Asynchronous Counter The operating mode is determined by the clock select bit, TMR1CS (T1CON<1>). When TMR3CS is cleared (= 0), Timer1 increments on every internal instruction cycle (FOSC/4). When the bit is set, Timer1 increments on every rising edge of the Timer1 external clock input or the Timer1 oscillator, if enabled. When Timer1 is enabled, the RC1/T1OSI and RC0/T1OSO/T13CKI pins become inputs. This means the values of TRISC<1:0> are ignored and the pins are read as `0'.
FIGURE 12-1:
TIMER1 BLOCK DIAGRAM
Timer1 Oscillator On/Off Timer1 Clock Input 1 Prescaler 1, 2, 4, 8 0 2 T1OSCEN(1) T1CKPS1:T1CKPS0 T1SYNC TMR1ON Sleep Input TMR1CS Timer1 On/Off Synchronize Detect 0 1 FOSC/4 Internal Clock
T1OSO/T13CKI
T1OSI
Clear TMR1 (CCP Special Event Trigger)
TMR1L
TMR1 High Byte
Set TMR1IF on Overflow
Note 1: When enable bit, T1OSCEN, is cleared, the inverter and feedback resistor are turned off to eliminate power drain.
FIGURE 12-2:
TIMER1 BLOCK DIAGRAM (16-BIT READ/WRITE MODE)
Timer1 Oscillator Timer1 Clock Input 1 1 FOSC/4 Internal Clock TMR1CS T1OSCEN(1) T1CKPS1:T1CKPS0 T1SYNC TMR1ON Clear TMR1 (CCP Special Event Trigger) Prescaler 1, 2, 4, 8 0 2 Sleep Input Timer1 On/Off
T1OSO/T13CKI
Synchronize Detect 0
T1OSI
TMR1L
TMR1 High Byte 8
Set TMR1IF on Overflow
Read TMR1L Write TMR1L 8 8 TMR1H 8 8 Internal Data Bus
Note 1: When enable bit, T1OSCEN, is cleared, the inverter and feedback resistor are turned off to eliminate power drain.
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12.2 Timer1 16-Bit Read/Write Mode
TABLE 12-1:
Oscillator Type LP Timer1 can be configured for 16-bit reads and writes (see Figure 12-2). When the RD16 control bit (T1CON<7>) is set, the address for TMR1H is mapped to a buffer register for the high byte of Timer1. A read from TMR1L will load the contents of the high byte of Timer1 into the Timer1 High Byte Buffer register. This provides the user with the ability to accurately read all 16 bits of Timer1 without having to determine whether a read of the high byte, followed by a read of the low byte, has become invalid due to a rollover between reads. A write to the high byte of Timer1 must also take place through the TMR1H Buffer register. The Timer1 high byte is updated with the contents of TMR1H when a write occurs to TMR1L. This allows a user to write all 16 bits to both the high and low bytes of Timer1 at once. The high byte of Timer1 is not directly readable or writable in this mode. All reads and writes must take place through the Timer1 High Byte Buffer register. Writes to TMR1H do not clear the Timer1 prescaler. The prescaler is only cleared on writes to TMR1L.
CAPACITOR SELECTION FOR THE TIMER OSCILLATOR(2,3,4)
Freq. 32 kHz C1 27 pF(1) C2 27 pF(1)
Note 1: Microchip suggests these values as a starting point in validating the oscillator circuit. 2: Higher capacitance increases the stability of the oscillator but also increases the start-up time. 3: Since each resonator/crystal has its own characteristics, the user should consult the resonator/crystal manufacturer for appropriate values of external components. 4: Capacitor values are for design guidance only.
12.3.1
USING TIMER1 AS A CLOCK SOURCE
12.3
Timer1 Oscillator
An on-chip crystal oscillator circuit is incorporated between pins T1OSI (input) and T1OSO (amplifier output). It is enabled by setting the Timer1 Oscillator Enable bit, T1OSCEN (T1CON<3>). The oscillator is a low-power circuit rated for 32 kHz crystals. It will continue to run during all power-managed modes. The circuit for a typical LP oscillator is shown in Figure 12-3. Table 12-1 shows the capacitor selection for the Timer1 oscillator. The user must provide a software time delay to ensure proper start-up of the Timer1 oscillator.
The Timer1 oscillator is also available as a clock source in power-managed modes. By setting the clock select bits, SCS1:SCS0 (OSCCON<1:0>), to `01', the device switches to SEC_RUN mode; both the CPU and peripherals are clocked from the Timer1 oscillator. If the IDLEN bit (OSCCON<7>) is cleared and a SLEEP instruction is executed, the device enters SEC_IDLE mode. Additional details are available in Section 3.0 "Power-Managed Modes". Whenever the Timer1 oscillator is providing the clock source, the Timer1 system clock status flag, T1RUN (T1CON<6>), is set. This can be used to determine the controller's current clocking mode. It can also indicate the clock source being currently used by the Fail-Safe Clock Monitor. If the Clock Monitor is enabled and the Timer1 oscillator fails while providing the clock, polling the T1RUN bit will indicate whether the clock is being provided by the Timer1 oscillator or another source.
FIGURE 12-3:
EXTERNAL COMPONENTS FOR THE TIMER1 LP OSCILLATOR
PIC18F87J10
T1OSI XTAL 32.768 kHz T1OSO
C1 27 pF
12.3.2
LOW-POWER TIMER1 OPTION
C2 27 pF Note: See the Notes with Table 12-1 for additional information about capacitor selection.
The Timer1 oscillator can operate at two distinct levels of power consumption based on device configuration. When the LPT1OSC configuration bit is set, the Timer1 oscillator operates in a low-power mode. When LPT1OSC is not set, Timer1 operates at a higher power level. Power consumption for a particular mode is relatively constant regardless of the device's operating mode. The default Timer1 configuration is the higher power mode. As the low-power Timer1 mode tends to be more sensitive to interference, high noise environments may cause some oscillator instability. The low-power option is, therefore, best suited for low noise applications where power conservation is an important design consideration.
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12.3.3 TIMER1 OSCILLATOR LAYOUT CONSIDERATIONS
12.5
Resetting Timer1 Using the ECCP Special Event Trigger
The Timer1 oscillator circuit draws very little power during operation. Due to the low-power nature of the oscillator, it may also be sensitive to rapidly changing signals in close proximity. The oscillator circuit, shown in Figure 12-3, should be located as close as possible to the microcontroller. There should be no circuits passing within the oscillator circuit boundaries other than VSS or VDD. If a high-speed circuit must be located near the oscillator (such as the ECCP1 pin in Output Compare or PWM mode, or the primary oscillator using the OSC2 pin), a grounded guard ring around the oscillator circuit, as shown in Figure 12-4, may be helpful when used on a single-sided PCB or in addition to a ground plane.
If ECCP1 or ECCP2 is configured to use Timer1 and to generate a Special Event Trigger in Compare mode (CCPxM3:CCPxM0 = 1011), this signal will reset Timer3. The trigger from ECCP2 will also start an A/D conversion if the A/D module is enabled (see Section 17.2.1 "Special Event Trigger" for more information). The module must be configured as either a timer or a synchronous counter to take advantage of this feature. When used this way, the CCPRH:CCPRL register pair effectively becomes a period register for Timer1. If Timer1 is running in Asynchronous Counter mode, this Reset operation may not work. In the event that a write to Timer1 coincides with a Special Event Trigger, the write operation will take precedence. Note: The Special Event Triggers from the ECCPx module will not set the TMR1IF interrupt flag bit (PIR1<0>).
FIGURE 12-4:
OSCILLATOR CIRCUIT WITH GROUNDED GUARD RING
VDD VSS OSC1 OSC2
12.6
Using Timer1 as a Real-Time Clock
RC0 RC1
RC2 Note: Not drawn to scale.
Adding an external LP oscillator to Timer1 (such as the one described in Section 12.3 "Timer1 Oscillator" above) gives users the option to include RTC functionality to their applications. This is accomplished with an inexpensive watch crystal to provide an accurate time base and several lines of application code to calculate the time. When operating in Sleep mode and using a battery or supercapacitor as a power source, it can completely eliminate the need for a separate RTC device and battery backup. The application code routine, RTCisr, shown in Example 12-1, demonstrates a simple method to increment a counter at one-second intervals using an Interrupt Service Routine. Incrementing the TMR1 register pair to overflow triggers the interrupt and calls the routine which increments the seconds counter by one. Additional counters for minutes and hours are incremented as the previous counter overflows. Since the register pair is 16 bits wide, counting up to overflow the register directly from a 32.768 kHz clock would take 2 seconds. To force the overflow at the required one-second intervals, it is necessary to preload it; the simplest method is to set the MSb of TMR1H with a BSF instruction. Note that the TMR1L register is never preloaded or altered; doing so may introduce cumulative error over many cycles. For this method to be accurate, Timer1 must operate in Asynchronous mode and the Timer1 overflow interrupt must be enabled (PIE1<0> = 1), as shown in the routine, RTCinit. The Timer1 oscillator must also be enabled and running at all times.
12.4
Timer1 Interrupt
The TMR1 register pair (TMR1H:TMR1L) increments from 0000h to FFFFh and rolls over to 0000h. The Timer1 interrupt, if enabled, is generated on overflow which is latched in interrupt flag bit, TMR1IF (PIR1<0>). This interrupt can be enabled or disabled by setting or clearing the Timer1 Interrupt Enable bit, TMR1IE (PIE1<0>).
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EXAMPLE 12-1:
RTCinit MOVLW MOVWF CLRF MOVLW MOVWF CLRF CLRF MOVLW MOVWF BSF RETURN RTCisr BSF BCF INCF MOVLW CPFSGT RETURN CLRF INCF MOVLW CPFSGT RETURN CLRF INCF MOVLW CPFSGT RETURN CLRF RETURN TMR1H, 7 PIR1, TMR1IF secs, F .59 secs secs mins, F .59 mins mins hours, F .23 hours hours ; ; ; ; ; ; ; ; ; ; ; ; Preload for 1 sec overflow Clear interrupt flag Increment seconds 60 seconds elapsed? No, done Clear seconds Increment minutes 60 minutes elapsed? No, done clear minutes Increment hours 24 hours elapsed? 80h TMR1H TMR1L b'00001111' T1CON secs mins .12 hours PIE1, TMR1IE ; Preload TMR1 register pair ; for 1 second overflow ; Configure for external clock, ; Asynchronous operation, external oscillator ; Initialize timekeeping registers ;
IMPLEMENTING A REAL-TIME CLOCK USING A TIMER1 INTERRUPT SERVICE
; Enable Timer1 interrupt
; No, done ; Reset hours ; Done
TABLE 12-2:
Name INTCON PIR1 PIE1 IPR1 TMR1L TMR1H T1CON
REGISTERS ASSOCIATED WITH TIMER1 AS A TIMER/COUNTER
Bit 7 Bit 6 Bit 5 TMR0IE RC1IF RC1IE RC1IP Bit 4 INT0IE TX1IF TX1IE TX1IP Bit 3 RBIE SSP1IF SSP1IE SSP1IP Bit 2 TMR0IF CCP1IF CCP1IE CCP1IP Bit 1 INT0IF TMR2IF TMR2IE TMR2IP Bit 0 RBIF TMR1IF TMR1IE TMR1IP Reset Values on page 49 51 51 51 50 50 TMR1CS TMR1ON 50
GIE/GIEH PEIE/GIEL PSPIF PSPIE PSPIP ADIF ADIE ADIP
Timer1 Register Low Byte Timer1 Register High Byte RD16 T1RUN T1CKPS1 T1CKPS0 T1OSCEN T1SYNC
Legend: Shaded cells are not used by the Timer1 module.
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NOTES:
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13.0 TIMER2 MODULE
13.1 Timer2 Operation
The Timer2 timer module incorporates the following features: * 8-bit timer and period registers (TMR2 and PR2, respectively) * Readable and writable (both registers) * Software programmable prescaler (1:1, 1:4 and 1:16) * Software programmable postscaler (1:1 through 1:16) * Interrupt on TMR2-to-PR2 match * Optional use as the shift clock for the MSSP module The module is controlled through the T2CON register (Register 13-1) which enables or disables the timer and configures the prescaler and postscaler. Timer2 can be shut off by clearing control bit, TMR2ON (T2CON<2>), to minimize power consumption. A simplified block diagram of the module is shown in Figure 13-1. In normal operation, TMR2 is incremented from 00h on each clock (FOSC/4). A 4-bit counter/prescaler on the clock input gives direct input, divide-by-4 and divide-by-16 prescale options; these are selected by the prescaler control bits, T2CKPS1:T2CKPS0 (T2CON<1:0>). The value of TMR2 is compared to that of the period register, PR2, on each clock cycle. When the two values match, the comparator generates a match signal as the timer output. This signal also resets the value of TMR2 to 00h on the next cycle and drives the output counter/postscaler (see Section 13.2 "Timer2 Interrupt"). The TMR2 and PR2 registers are both directly readable and writable. The TMR2 register is cleared on any device Reset, while the PR2 register initializes at FFh. Both the prescaler and postscaler counters are cleared on the following events: * a write to the TMR2 register * a write to the T2CON register * any device Reset (Power-on Reset, MCLR Reset, Watchdog Timer Reset or Brown-out Reset) TMR2 is not cleared when T2CON is written.
REGISTER 13-1:
T2CON: TIMER2 CONTROL REGISTER
U-0 -- bit 7 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 bit 0 T2OUTPS3 T2OUTPS2 T2OUTPS1 T2OUTPS0 TMR2ON T2CKPS1 T2CKPS0
bit 7 bit 6-3
Unimplemented: Read as `0' T2OUTPS3:T2OUTPS0: Timer2 Output Postscale Select bits 0000 = 1:1 Postscale 0001 = 1:2 Postscale * * * 1111 = 1:16 Postscale TMR2ON: Timer2 On bit 1 = Timer2 is on 0 = Timer2 is off T2CKPS1:T2CKPS0: Timer2 Clock Prescale Select bits 00 = Prescaler is 1 01 = Prescaler is 4 1x = Prescaler is 16 Legend: R = Readable bit -n = Value at POR W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown
bit 2
bit 1-0
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13.2 Timer2 Interrupt 13.3 Timer2 Output
Timer2 can also generate an optional device interrupt. The Timer2 output signal (TMR2-to-PR2 match) provides the input for the 4-bit output counter/postscaler. This counter generates the TMR2 match interrupt flag which is latched in TMR2IF (PIR1<1>). The interrupt is enabled by setting the TMR2 Match Interrupt Enable bit, TMR2IE (PIE1<1>). A range of 16 postscale options (from 1:1 through 1:16 inclusive) can be selected with the postscaler control bits, T2OUTPS3:T2OUTPS0 (T2CON<6:3>). The unscaled output of TMR2 is available primarily to the CCP modules, where it is used as a time base for operations in PWM mode. Timer2 can be optionally used as the shift clock source for the MSSP module operating in SPI mode. Additional information is provided in Section 18.0 "Master Synchronous Serial Port (MSSP) Module".
FIGURE 13-1:
TIMER2 BLOCK DIAGRAM
4 1:1 to 1:16 Postscaler
T2OUTPS3:T2OUTPS0 2 T2CKPS1:T2CKPS0 Reset TMR2
8
Set TMR2IF TMR2 Output (to PWM or MSSP)
TMR2/PR2 Match Comparator PR2
8 8
FOSC/4
1:1, 1:4, 1:16 Prescaler
Internal Data Bus
TABLE 13-1:
Name
REGISTERS ASSOCIATED WITH TIMER2 AS A TIMER/COUNTER
Bit 6 Bit 5 TMR0IE RC1IF RC1IE RC1IP Bit 4 INT0IE TX1IF TX1IE TX1IP Bit 3 RBIE SSP1IF SSP1IE SSP1IP Bit 2 TMR0IF CCP1IF CCP1IE CCP1IP Bit 1 INT0IF TMR2IF TMR2IE TMR2IP Bit 0 RBIF TMR1IF TMR1IE TMR1IP Reset Values on page 49 51 51 51 50 T2CKPS1 T2CKPS0 50 50
Bit 7
INTCON GIE/GIEH PEIE/GIEL PIR1 PIE1 IPR1 TMR2 T2CON PR2 PSPIF PSPIE PSPIP -- ADIF ADIE ADIP
Timer2 Register T2OUTPS3 T2OUTPS2 T2OUTPS1 T2OUTPS0 TMR2ON Timer2 Period Register
Legend: -- = unimplemented, read as `0'. Shaded cells are not used by the Timer2 module.
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14.0 TIMER3 MODULE
The Timer3 timer/counter module incorporates these features: * Software selectable operation as a 16-bit timer or counter * Readable and writable 8-bit registers (TMR3H and TMR3L) * Selectable clock source (internal or external) with device clock or Timer1 oscillator internal options * Interrupt-on-overflow * Module Reset on CCP Special Event Trigger A simplified block diagram of the Timer3 module is shown in Figure 14-1. A block diagram of the module's operation in Read/Write mode is shown in Figure 14-2. The Timer3 module is controlled through the T3CON register (Register 14-1). It also selects the clock source options for the CCP and ECCP modules; see Section 16.1.1 "CCP Modules and Timer Resources" for more information.
REGISTER 14-1:
T3CON: TIMER3 CONTROL REGISTER
R/W-0 RD16 bit 7 R/W-0 T3CCP2 R/W-0 T3CKPS1 R/W-0 T3CKPS0 R/W-0 T3CCP1 R/W-0 T3SYNC R/W-0 TMR3CS R/W-0 TMR3ON bit 0
bit 7
RD16: 16-bit Read/Write Mode Enable bit 1 = Enables register read/write of Timer3 in one 16-bit operation 0 = Enables register read/write of Timer3 in two 8-bit operations T3CCP2:T3CCP1: Timer3 and Timer1 to CCPx Enable bits 11 = Timer3 and Timer4 are the clock sources for all CCP/ECCP modules 10 = Timer3 and Timer4 are the clock sources for ECCP3, CCP4 and CCP5; Timer1 and Timer2 are the clock sources for ECCP1 and ECCP2 01 = Timer3 and Timer4 are the clock sources for ECCP2, ECCP3, CCP4 and CCP5; Timer1 and Timer2 are the clock sources for ECCP1 00 = Timer1 and Timer2 are the clock sources for all CCP/ECCP modules T3CKPS1:T3CKPS0: Timer3 Input Clock Prescale Select bits 11 = 1:8 Prescale value 10 = 1:4 Prescale value 01 = 1:2 Prescale value 00 = 1:1 Prescale value T3SYNC: Timer3 External Clock Input Synchronization Control bit (Not usable if the device clock comes from Timer1/Timer3.) When TMR3CS = 1: 1 = Do not synchronize external clock input 0 = Synchronize external clock input When TMR3CS = 0: This bit is ignored. Timer3 uses the internal clock when TMR3CS = 0. TMR3CS: Timer3 Clock Source Select bit 1 = External clock input from Timer1 oscillator or T13CKI (on the rising edge after the first falling edge) 0 = Internal clock (FOSC/4) TMR3ON: Timer3 On bit 1 = Enables Timer3 0 = Stops Timer3 Legend: R = Readable bit -n = Value at POR W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown
bit 6,3
bit 5-4
bit 2
bit 1
bit 0
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14.1 Timer3 Operation
Timer3 can operate in one of three modes: * Timer * Synchronous Counter * Asynchronous Counter The operating mode is determined by the clock select bit, TMR3CS (T3CON<1>). When TMR3CS is cleared (= 0), Timer3 increments on every internal instruction cycle (FOSC/4). When the bit is set, Timer3 increments on every rising edge of the Timer1 external clock input or the Timer1 oscillator, if enabled. As with Timer1, the RC1/T1OSI and RC0/T1OSO/T13CKI pins become inputs when the Timer1 oscillator is enabled. This means the values of TRISC<1:0> are ignored and the pins are read as `0'.
FIGURE 14-1:
TIMER3 BLOCK DIAGRAM
Timer1 Oscillator Timer1 Clock Input 1 1 FOSC/4 Internal Clock T1OSCEN T3SYNC TMR3ON
(1)
T1OSO/T13CKI
Prescaler 1, 2, 4, 8 0 2
Synchronize Detect 0
T1OSI
Sleep Input TMR3CS
T3CKPS1:T3CKPS0
Timer3 On/Off
CCPx Special Event Trigger CCPx Select from T3CON<6,3>
Clear TMR3
TMR3L
TMR3 High Byte
Set TMR3IF on Overflow
Note 1: When enable bit, T1OSCEN, is cleared, the inverter and feedback resistor are turned off to eliminate power drain.
FIGURE 14-2:
TIMER3 BLOCK DIAGRAM (16-BIT READ/WRITE MODE)
Timer1 Oscillator Timer1 Clock Input 1 1 FOSC/4 Internal Clock T1OSCEN(1) T3CKPS1:T3CKPS0 T3SYNC TMR3ON CCPx Special Event Trigger CCPx Select from T3CON<6,3> Clear TMR3 TMR3L TMR3 High Byte 8 Set TMR3IF on Overflow TMR3CS Prescaler 1, 2, 4, 8 0 2 Sleep Input Timer3 On/Off Synchronize Detect 0
T13CKI/T1OSO
T1OSI
Read TMR1L Write TMR1L 8 8 TMR3H 8 8 Internal Data Bus Note 1: When enable bit, T1OSCEN, is cleared, the inverter and feedback resistor are turned off to eliminate power drain.
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14.2 Timer3 16-Bit Read/Write Mode 14.4 Timer3 Interrupt
Timer3 can be configured for 16-bit reads and writes (see Figure 14-2). When the RD16 control bit (T3CON<7>) is set, the address for TMR3H is mapped to a buffer register for the high byte of Timer3. A read from TMR3L will load the contents of the high byte of Timer3 into the Timer3 High Byte Buffer register. This provides the user with the ability to accurately read all 16 bits of Timer1 without having to determine whether a read of the high byte, followed by a read of the low byte, has become invalid due to a rollover between reads. A write to the high byte of Timer3 must also take place through the TMR3H Buffer register. The Timer3 high byte is updated with the contents of TMR3H when a write occurs to TMR3L. This allows a user to write all 16 bits to both the high and low bytes of Timer3 at once. The high byte of Timer3 is not directly readable or writable in this mode. All reads and writes must take place through the Timer3 High Byte Buffer register. Writes to TMR3H do not clear the Timer3 prescaler. The prescaler is only cleared on writes to TMR3L. The TMR3 register pair (TMR3H:TMR3L) increments from 0000h to FFFFh and overflows to 0000h. The Timer3 interrupt, if enabled, is generated on overflow and is latched in interrupt flag bit, TMR3IF (PIR2<1>). This interrupt can be enabled or disabled by setting or clearing the Timer3 Interrupt Enable bit, TMR3IE (PIE2<1>).
14.5
Resetting Timer3 Using the ECCP Special Event Trigger
If ECCP1 or ECCP2 is configured to use Timer3 and to generate a Special Event Trigger in Compare mode (CCPxM3:CCPxM0 = 1011), this signal will reset Timer3. The trigger from ECCP2 will also start an A/D conversion if the A/D module is enabled (see Section 17.2.1 "Special Event Trigger" for more information). The module must be configured as either a timer or synchronous counter to take advantage of this feature. When used this way, the CCPRxH:CCPRxL register pair effectively becomes a period register for Timer3. If Timer3 is running in Asynchronous Counter mode, the Reset operation may not work. In the event that a write to Timer3 coincides with a Special Event Trigger from an ECCP module, the write will take precedence. Note: The Special Event Triggers from the ECCPx module will not set the TMR3IF interrupt flag bit (PIR1<0>).
14.3
Using the Timer1 Oscillator as the Timer3 Clock Source
The Timer1 internal oscillator may be used as the clock source for Timer3. The Timer1 oscillator is enabled by setting the T1OSCEN (T1CON<3>) bit. To use it as the Timer3 clock source, the TMR3CS bit must also be set. As previously noted, this also configures Timer3 to increment on every rising edge of the oscillator source. The Timer1 oscillator is described in Section 12.0 "Timer1 Module".
TABLE 14-1:
Name INTCON PIR2 PIE2 IPR2 TMR3L TMR3H T1CON T3CON
REGISTERS ASSOCIATED WITH TIMER3 AS A TIMER/COUNTER
Bit 7 Bit 6 Bit 5 TMR0IE -- -- -- Bit 4 INT0IE -- -- -- Bit 3 RBIE BCL1IF BCL1IE BCL1IP Bit 2 TMR0IF -- -- -- Bit 1 INT0IF TMR3IF TMR3IE TMR3IP Bit 0 RBIF CCP2IF CCP2IE CCP2IP Reset Values on page 49 51 51 51 51 51 TMR1CS TMR3CS TMR1ON TMR3ON 50 51 T3CCP1 T3SYNC
GIE/GIEH PEIE/GIEL OSCFIF OSCFIE OSCFIP CMIF CMIE CMIP
Timer3 Register Low Byte Timer3 Register High Byte RD16 RD16 T1RUN T3CCP2 T1CKPS1 T1CKPS0 T1OSCEN T1SYNC T3CKPS1 T3CKPS0
Legend: -- = unimplemented, read as `0'. Shaded cells are not used by the Timer3 module.
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NOTES:
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15.0
* * * * * *
TIMER4 MODULE
15.1
Timer4 Operation
The Timer4 timer module has the following features: 8-bit timer register (TMR4) 8-bit period register (PR4) Readable and writable (both registers) Software programmable prescaler (1:1, 1:4, 1:16) Software programmable postscaler (1:1 to 1:16) Interrupt on TMR4 match of PR4
Timer4 has a control register shown in Register 15-1. Timer4 can be shut off by clearing control bit, TMR4ON (T4CON<2>), to minimize power consumption. The prescaler and postscaler selection of Timer4 are also controlled by this register. Figure 15-1 is a simplified block diagram of the Timer4 module.
Timer4 can be used as the PWM time base for the PWM mode of the CCP module. The TMR4 register is readable and writable and is cleared on any device Reset. The input clock (FOSC/4) has a prescale option of 1:1, 1:4 or 1:16, selected by control bits T4CKPS1:T4CKPS0 (T4CON<1:0>). The match output of TMR4 goes through a 4-bit postscaler (which gives a 1:1 to 1:16 scaling inclusive) to generate a TMR4 interrupt, latched in flag bit TMR4IF (PIR3<3>). The prescaler and postscaler counters are cleared when any of the following occurs: * a write to the TMR4 register * a write to the T4CON register * any device Reset (Power-on Reset, MCLR Reset, Watchdog Timer Reset or Brown-out Reset) TMR4 is not cleared when T4CON is written.
REGISTER 15-1:
T4CON: TIMER4 CONTROL REGISTER
U-0 -- bit 7 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 bit 0 T4OUTPS3 T4OUTPS2 T4OUTPS1 T4OUTPS0 TMR4ON T4CKPS1 T4CKPS0
bit 7 bit 6-3
Unimplemented: Read as `0' T4OUTPS3:T4OUTPS0: Timer4 Output Postscale Select bits 0000 = 1:1 Postscale 0001 = 1:2 Postscale * * * 1111 = 1:16 Postscale TMR4ON: Timer4 On bit 1 = Timer4 is on 0 = Timer4 is off T4CKPS1:T4CKPS0: Timer4 Clock Prescale Select bits 00 = Prescaler is 1 01 = Prescaler is 4 1x = Prescaler is 16 Legend: R = Readable bit -n = Value at POR W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown
bit 2
bit 1-0
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15.2 Timer4 Interrupt 15.3 Output of TMR4
The Timer4 module has an 8-bit period register, PR4, which is both readable and writable. Timer4 increments from 00h until it matches PR4 and then resets to 00h on the next increment cycle. The PR4 register is initialized to FFh upon Reset. The output of TMR4 (before the postscaler) is used only as a PWM time base for the CCP modules. It is not used as a baud rate clock for the MSSP as is the Timer2 output.
FIGURE 15-1:
TIMER4 BLOCK DIAGRAM
4 1:1 to 1:16 Postscaler
T4OUTPS3:T4OUTPS0 2 T4CKPS1:T4CKPS0
Reset
Set TMR4IF TMR4 Output (to PWM)
TMR4/PR4 Match Comparator
FOSC/4
1:1, 1:4, 1:16 Prescaler
TMR4
8
PR4
8
8
Internal Data Bus
TABLE 15-1:
Name
REGISTERS ASSOCIATED WITH TIMER4 AS A TIMER/COUNTER
Bit 6 Bit 5 TMR0IE RC2IP RC2IF RC2IE Bit 4 INT0IE TX2IP TX2IF TX2IE Bit 3 RBIE TMR4IP TMR4IF TMR4IE Bit 2 TMR0IF CCP5IP CCP5IF CCP5IE Bit 1 INT0IF CCP4IP CCP4IF CCP4IE Bit 0 RBIF CCP3IP CCP3IF CCP3IE Reset Values on page 49 51 51 51 53 53 53
Bit 7
INTCON GIE/GIEH PEIE/GIEL IPR3 PIR3 PIE3 TMR4 T4CON PR4 SSP2IP SSP2IF SSP2IE -- BCL2IP BCL2IF BCL2IE
Timer4 Register T4OUTPS3 T4OUTPS2 T4OUTPS1 T4OUTPS0 TMR4ON T4CKPS1 T4CKPS0 Timer4 Period Register
Legend: -- = unimplemented, read as `0'. Shaded cells are not used by the Timer4 module.
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16.0 CAPTURE/COMPARE/PWM (CCP) MODULES
register. For the sake of clarity, all CCP module operation in the following sections is described with respect to CCP4, but is equally applicable to CCP5. Capture and Compare operations described in this chapter apply to all standard and Enhanced CCP modules. The operations of PWM mode, described in Section 16.4 "PWM Mode", apply to CCP4 and CCP5 only. Note: Throughout this section and Section 17.0 "Enhanced Capture/Compare/PWM (ECCP) Module", references to register and bit names that may be associated with a specific CCP module are referred to generically by the use of `x' or `y' in place of the specific module number. Thus, "CCPxCON" might refer to the control register for ECCP1, ECCP2, ECCP3, CCP4 or CCP5.
Members of the PIC18F87J10 family of devices all have a total of five CCP (Capture/Compare/PWM) modules. Two of these (CCP4 and CCP5) implement standard Capture, Compare and Pulse-Width Modulation (PWM) modes and are discussed in this section. The other three modules (ECCP1, ECCP2, ECCP3) implement standard Capture and Compare modes, as well as Enhanced PWM modes. These are discussed in Section 17.0 "Enhanced Capture/Compare/PWM (ECCP) Module". Each CCP/ECCP module contains a 16-bit register which can operate as a 16-bit Capture register, a 16-bit Compare register or a PWM Master/Slave Duty Cycle
REGISTER 16-1:
CCPxCON: CCP CONTROL REGISTER (CCP4 AND CCP5)
U-0 -- bit 7 U-0 -- R/W-0 DCxB1 R/W-0 DCxB0 R/W-0 CCPxM3 R/W-0 CCPxM2 R/W-0 CCPxM1 R/W-0 CCPxM0 bit 0
bit 7-6 bit 5-4
Unimplemented: Read as `0' DCxB1:DCxB0: CCP Module x PWM Duty Cycle bit 1 and bit 0 Capture mode: Unused. Compare mode: Unused. PWM mode: These bits are the two Least Significant bits (bit 1 and bit 0) of the 10-bit PWM duty cycle. The eight Most Significant bits (DCx9:DCx2) of the duty cycle are found in CCPRxL. CCPxM3:CCPxM0: CCP Module x Mode Select bits 0000 = Capture/Compare/PWM disabled (resets CCPx module) 0001 = Reserved 0010 = Compare mode, toggle output on match (CCPxIF bit is set) 0011 = Reserved 0100 = Capture mode, every falling edge 0101 = Capture mode, every rising edge 0110 = Capture mode, every 4th rising edge 0111 = Capture mode, every 16th rising edge 1000 = Compare mode; initialize CCP pin low; on compare match, force CCP pin high (CCPIF bit is set) 1001 = Compare mode; initialize CCP pin high; on compare match, force CCP pin low (CCPIF bit is set) 1010 = Compare mode; generate software interrupt on compare match (CCPIF bit is set, CCP pin reflects I/O state) 1011 = Reserved 11xx = PWM mode Legend: R = Readable bit -n = Value at POR W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown
bit 3-0
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16.1 CCP Module Configuration
Each Capture/Compare/PWM module is associated with a control register (generically, CCPxCON) and a data register (CCPRx). The data register, in turn, is comprised of two 8-bit registers: CCPRxL (low byte) and CCPRxH (high byte). All registers are both readable and writable. The assignment of a particular timer to a module is determined by the Timer-to-CCP enable bits in the T3CON register (Register 14-1, page 153). Depending on the configuration selected, up to four timers may be active at once, with modules in the same configuration (Capture/Compare or PWM) sharing timer resources. The possible configurations are shown in Figure 16-1.
16.1.1
CCP MODULES AND TIMER RESOURCES
16.1.2
ECCP2 PIN ASSIGNMENT
The CCP/ECCP modules utilize Timers 1, 2, 3 or 4, depending on the mode selected. Timer1 and Timer3 are available to modules in Capture or Compare modes, while Timer2 and Timer4 are available for modules in PWM mode.
The pin assignment for ECCP2 (Capture input, Compare and PWM output) can change, based on device configuration. The CCP2MX configuration bit determines which pin ECCP2 is multiplexed to. By default, it is assigned to RC1 (CCP2MX = 1). If the configuration bit is cleared, ECCP2 is multiplexed with RE7 on 64-pin devices and RB3 or RE7 on 80-pin devices depending on mode setting. Changing the pin assignment of ECCP2 does not automatically change any requirements for configuring the port pin. Users must always verify that the appropriate TRIS register is configured correctly for ECCP2 operation regardless of where it is located.
TABLE 16-1:
CCP MODE - TIMER RESOURCE
Timer Resource Timer1 or Timer3 Timer1 or Timer3 Timer2 or Timer4
CCP Mode Capture Compare PWM
FIGURE 16-1:
CCP AND TIMER INTERCONNECT CONFIGURATIONS
T3CCP<2:1> = 01 TMR1 TMR3 T3CCP<2:1> = 10 TMR1 TMR3 T3CCP<2:1> = 11 TMR1 TMR3
T3CCP<2:1> = 00 TMR1 TMR3
ECCP1 ECCP2 ECCP3 CCP4 CCP5
ECCP1 ECCP2 ECCP3 CCP4 CCP5
ECCP1 ECCP2 ECCP3 CCP4 CCP5
ECCP1 ECCP2 ECCP3 CCP4 CCP5
TMR2
TMR4
TMR2
TMR4
TMR2
TMR4
TMR2
TMR4
Timer1 is used for all Capture and Compare operations for all CCP modules. Timer2 is used for PWM operations for all CCP modules. Modules may share either timer resource as a common time base. Timer3 and Timer4 are not available.
Timer1 and Timer2 are used for Capture and Compare or PWM operations for ECCP1 only (depending on selected mode). All other modules use either Timer3 or Timer4. Modules may share either timer resource as a common time base if they are in Capture/Compare or PWM modes.
Timer1 and Timer2 are used for Capture and Compare or PWM operations for ECCP1 and ECCP2 only (depending on the mode selected for each module). Both modules may use a timer as a common time base if they are both in Capture/Compare or PWM modes. The other modules use either Timer3 or Timer4. Modules may share either timer resource as a common time base if they are in Capture/Compare or PWM modes.
Timer3 is used for all Capture and Compare operations for all CCP modules. Timer4 is used for PWM operations for all CCP modules. Modules may share either timer resource as a common time base. Timer1 and Timer2 are not available.
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16.2 Capture Mode
16.2.3 SOFTWARE INTERRUPT
In Capture mode, the CCPRxH:CCPRxL register pair captures the 16-bit value of the TMR1 or TMR3 registers when an event occurs on the corresponding CCPx pin. An event is defined as one of the following: * * * * every falling edge every rising edge every 4th rising edge every 16th rising edge When the Capture mode is changed, a false capture interrupt may be generated. The user should keep the CCPxIE interrupt enable bit clear to avoid false interrupts. The interrupt flag bit, CCPxIF, should also be cleared following any such change in operating mode.
16.2.4
CCP PRESCALER
The event is selected by the mode select bits, CCPxM3:CCPxM0 (CCPxCON<3:0>). When a capture is made, the interrupt request flag bit, CCPxIF, is set; it must be cleared in software. If another capture occurs before the value in register CCPRx is read, the old captured value is overwritten by the new captured value.
There are four prescaler settings in Capture mode. They are specified as part of the operating mode selected by the mode select bits (CCPxM3:CCPxM0). Whenever the CCP module is turned off or Capture mode is disabled, the prescaler counter is cleared. This means that any Reset will clear the prescaler counter. Switching from one capture prescaler to another may generate an interrupt. Also, the prescaler counter will not be cleared; therefore, the first capture may be from a non-zero prescaler. Example 16-1 shows the recommended method for switching between capture prescalers. This example also clears the prescaler counter and will not generate the "false" interrupt.
16.2.1
CCP PIN CONFIGURATION
In Capture mode, the appropriate CCPx pin should be configured as an input by setting the corresponding TRIS direction bit. Note: If RG4/CCP5 is configured as an output, a write to the port can cause a capture condition.
EXAMPLE 16-1:
CHANGING BETWEEN CAPTURE PRESCALERS (CCP5 SHOWN)
16.2.2
TIMER1/TIMER3 MODE SELECTION
The timers that are to be used with the capture feature (Timer1 and/or Timer3) must be running in Timer mode or Synchronized Counter mode. In Asynchronous Counter mode, the capture operation will not work. The timer to be used with each CCP module is selected in the T3CON register (see Section 16.1.1 "CCP Modules and Timer Resources").
CLRF MOVLW
MOVWF
CCP5CON ; Turn CCP module off NEW_CAPT_PS ; Load WREG with the ; new prescaler mode ; value and CCP ON CCP5CON ; Load CCP5CON with ; this value
FIGURE 16-2:
CAPTURE MODE OPERATION BLOCK DIAGRAM
TMR3H Set CCP4IF T3CCP2 TMR3 Enable CCPR4H TMR1 Enable TMR1H Set CCP5IF TMR1L CCPR4L TMR3L
CCP4 Pin Prescaler / 1, 4, 16 and Edge Detect T3CCP2 CCP4CON<3:0> Q1:Q4 CCP5CON<3:0> 4 4 T3CCP1 T3CCP2 CCP5 Pin Prescaler / 1, 4, 16 and Edge Detect 4
TMR3H TMR3 Enable CCPR5H TMR1 Enable
TMR3L
CCPR5L
T3CCP2 T3CCP1
TMR1H
TMR1L
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16.3 Compare Mode
Note: In Compare mode, the 16-bit CCPRx register value is constantly compared against either the TMR1 or TMR3 register pair value. When a match occurs, the CCPx pin can be: * * * * driven high driven low toggled (high-to-low or low-to-high) remain unchanged (that is, reflects the state of the I/O latch) Clearing the CCP5CON register will force the RG4 compare output latch (depending on device configuration) to the default low level. This is not the PORTB or PORTC I/O data latch.
16.3.2
TIMER1/TIMER3 MODE SELECTION
Timer1 and/or Timer3 must be running in Timer mode or Synchronized Counter mode if the CCP module is using the compare feature. In Asynchronous Counter mode, the compare operation may not work.
The action on the pin is based on the value of the mode select bits (CCPxM3:CCPxM0). At the same time, the interrupt flag bit, CCPxIF, is set.
16.3.3
SOFTWARE INTERRUPT MODE
16.3.1
CCP PIN CONFIGURATION
The user must configure the CCPx pin as an output by clearing the appropriate TRIS bit.
When the Generate Software Interrupt mode is chosen (CCPxM3:CCPxM0 = 1010), the corresponding CCPx pin is not affected. Only a CCP interrupt is generated, if enabled and the CCPxIE bit is set.
FIGURE 16-3:
COMPARE MODE OPERATION BLOCK DIAGRAM
CCPR4H CCPR4L Set CCP4IF CCP4 pin Comparator Compare Match Output Logic 4 CCP4CON<3:0> S R TRIS Output Enable Q
0
TMR1H
TMR1L
0
1
TMR3H T3CCP1
TMR3L
1
T3CCP2 Set CCP5IF Comparator Compare Match Output Logic 4 CCP5CON<3:0> S R TRIS Output Enable Q CCP5 pin
CCPR5H
CCPR5L
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TABLE 16-2:
Name INTCON RCON PIR1 PIE1 IPR1 PIR2 PIE2 IPR2 PIR3 PIE3 IPR3 TRISG TMR1L TMR1H T1CON TMR3H TMR3L T3CON CCPR4L CCPR4H CCPR5L CCPR5H CCP4CON CCP5CON
REGISTERS ASSOCIATED WITH CAPTURE, COMPARE, TIMER1 AND TIMER3
Bit 7 Bit 6 Bit 5 Bit 4 INT0IE RI TX1IF TX1IE TX1IP -- -- -- TX2IF TX2IE TX2IP TRISG4 Bit 3 RBIE TO SSP1IF SSP1IE SSP1IP BCL1IF BCL1IE BCL1IP TMR4IF TMR4IE TMR4IP TRISG3 Bit 2 TMR0IF PD CCP1IF CCP1IE CCP1IP -- -- -- CCP5IF CCP5IE CCP5IP TRISG2 Bit 1 INT0IF POR TMR2IF TMR2IE TMR2IP TMR3IF TMR3IE TMR3IP CCP4IF CCP4IE CCP4IP TRISG1 Bit 0 RBIF BOR TMR1IF TMR1IE TMR1IP CCP2IF CCP2IE CCP2IP CCP3IF CCP3IE CCP3IP TRISG0 Reset Values on page 49 50 51 51 51 51 51 51 51 51 51 52 50 50 TMR1CS TMR1ON 50 51 51 T3CCP1 T3SYNC TMR3CS TMR3ON 51 53 53 53 53 CCP4M3 CCP5M3 CCP4M2 CCP5M2 CCP4M1 CCP5M1 CCP4M0 CCP5M0 53 53
GIE/GIEH PEIE/GIEL TMR0IE IPEN PSPIF PSPIE PSPIP OSCFIF OSCFIE OSCFIP SSP2IF SSP2IE SSP2IP -- -- ADIF ADIE ADIP CMIF CMIE CMIP BCL2IF BCL2IE BCL2IP -- -- RC1IF RC1IE RC1IP -- -- -- RC2IF RC2IE RC2IP --
Timer1 Register Low Byte Timer1 Register High Byte RD16 T1RUN T1CKPS1 T1CKPS0 T1OSCEN T1SYNC Timer3 Register High Byte Timer3 Register Low Byte RD16 T3CCP2 T3CKPS1 T3CKPS0 Capture/Compare/PWM Register 4 Low Byte Capture/Compare/PWM Register 4 High Byte Capture/Compare/PWM Register 5 Low Byte Capture/Compare/PWM Register 5 High Byte -- -- -- -- DC4B1 DC5B1 DC4B0 DC5B0
Legend: -- = unimplemented, read as `0'. Shaded cells are not used by Capture/Compare, Timer1 or Timer3.
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16.4 PWM Mode
16.4.1 PWM PERIOD
In Pulse-Width Modulation (PWM) mode, the CCPx pin produces up to a 10-bit resolution PWM output. Since the CCP4 and CCP5 pins are multiplexed with a PORTG data latch, the appropriate TRISG bit must be cleared to make the CCP4 or CCP5 pin an output. Note: Clearing the CCP4CON or CCP5CON register will force the RG3 or RG4 output latch (depending on device configuration) to the default low level. This is not the PORTG I/O data latch. The PWM period is specified by writing to the PR2 (PR4) register. The PWM period can be calculated using Equation 16-1:
EQUATION 16-1:
PWM Period = [(PR2) + 1] * 4 * TOSC * (TMR2 Prescale Value) PWM frequency is defined as 1/[PWM period]. When TMR2 (TMR4) is equal to PR2 (PR4), the following three events occur on the next increment cycle: * TMR2 (TMR4) is cleared * The CCPx pin is set (exception: if PWM duty cycle = 0%, the CCPx pin will not be set) * The PWM duty cycle is latched from CCPRxL into CCPRxH Note: The Timer2 and Timer 4 postscalers (see Section 13.0 "Timer2 Module" and Section 15.0 "Timer4 Module") are not used in the determination of the PWM frequency. The postscaler could be used to have a servo update rate at a different frequency than the PWM output.
Figure 16-4 shows a simplified block diagram of the CCP module in PWM mode. For a step-by-step procedure on how to set up a CCP module for PWM operation, see Section 16.4.3 "Setup for PWM Operation".
FIGURE 16-4:
SIMPLIFIED PWM BLOCK DIAGRAM
0
Duty Cycle Register 9 CCPR1L Latch Duty Cycle CCPR1H (1) CCP1CON<5:4>
Comparator Reset TMR2 = PR2 Match
S R
Q ECCP1 pin
16.4.2
PWM DUTY CYCLE
TMR2 2 LSbs latched from Q clocks
Comparator
PR2 Set CCP pin Note 1: TRIS Output Enable
The PWM duty cycle is specified by writing to the CCPRxL register and to the CCPxCON<5:4> bits. Up to 10-bit resolution is available. The CCPRxL contains the eight MSbs and the CCPxCON<5:4> contains the two LSbs. This 10-bit value is represented by CCPRxL:CCPxCON<5:4>. Equation 16-2 is used to calculate the PWM duty cycle in time.
The two LSbs of the Duty Cycle register are held by a 2-bit latch that is part of the module's hardware. It is physically separate from the CCPR registers.
EQUATION 16-2:
PWM Duty Cycle = (CCPRXL:CCPXCON<5:4>) * TOSC * (TMR2 Prescale Value) CCPRxL and CCPxCON<5:4> can be written to at any time, but the duty cycle value is not latched into CCPRxH until after a match between PR2 (PR4) and TMR2 (TMR4) occurs (i.e., the period is complete). In PWM mode, CCPRxH is a read-only register.
A PWM output (Figure 16-5) has a time base (period) and a time that the output stays high (duty cycle). The frequency of the PWM is the inverse of the period (1/period).
FIGURE 16-5:
Period
PWM OUTPUT
Duty Cycle TMR2 (TMR4) = PR2 (PR4) TMR2 (TMR4) = Duty Cycle TMR2 (TMR4) = PR2 (TMR4)
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The CCPRxH register and a 2-bit internal latch are used to double-buffer the PWM duty cycle. This double-buffering is essential for glitchless PWM operation. When the CCPRxH and 2-bit latch match TMR2 (TMR4), concatenated with an internal 2-bit Q clock or 2 bits of the TMR2 (TMR4) prescaler, the CCPx pin is cleared. The maximum PWM resolution (bits) for a given PWM frequency is given by Equation 16-3:
16.4.3
SETUP FOR PWM OPERATION
The following steps should be taken when configuring the CCP module for PWM operation: 1. 2. 3. 4. Set the PWM period by writing to the PR2 (PR4) register. Set the PWM duty cycle by writing to the CCPRxL register and CCPxCON<5:4> bits. Make the CCPx pin an output by clearing the appropriate TRIS bit. Set the TMR2 (TMR4) prescale value, then enable Timer2 (Timer4) by writing to T2CON (T4CON). Configure the CCPx module for PWM operation.
EQUATION 16-3:
PWM Resolution (max) = FOSC log( FPWM log(2)
)
5. bits
Note:
If the PWM duty cycle value is longer than the PWM period, the CCPx pin will not be cleared.
TABLE 16-3:
EXAMPLE PWM FREQUENCIES AND RESOLUTIONS AT 40 MHz
2.44 kHz 16 FFh 10 9.77 kHz 4 FFh 10 39.06 kHz 1 FFh 10 156.25 kHz 1 3Fh 8 312.50 kHz 1 1Fh 7 416.67 kHz 1 17h 6.58
PWM Frequency Timer Prescaler (1, 4, 16) PR2 Value Maximum Resolution (bits)
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TABLE 16-4:
Name INTCON RCON PIR1 PIE1 IPR1 PIR3 PIE3 IPR3 TRISG TMR2 PR2 T2CON TMR4 PR4 T4CON CCPR4L CCPR4H CCPR5L CCPR5H CCP4CON CCP5CON
REGISTERS ASSOCIATED WITH PWM, TIMER2 AND TIMER4
Bit 7 Bit 6 Bit 5 TMR0IE -- RC1IF RC1IE RC1IP RC2IF RC2IE RC2IP -- Bit 4 INT0IE RI TX1IF TX1IE TX1IP TX2IF TX2IE TX2IP TRISG4 Bit 3 RBIE TO SSP1IF SSP1IE SSP1IP TMR4IF TMR4IE TMR4IP TRISG3 Bit 2 TMR0IF PD CCP1IF CCP1IE CCP1IP CCP5IF CCP5IE CCP5IP TRISG2 Bit 1 INT0IF POR TMR2IF TMR2IE TMR2IP CCP4IF CCP4IE CCP4IP TRISG1 Bit 0 RBIF BOR TMR1IF TMR1IE TMR1IP CCP3IF CCP3IE CCP3IP TRISG0 Reset Values on page 49 50 51 51 51 51 51 51 52 50 50 50 53 53 53 53 53 53 53 CCP4M3 CCP5M3 CCP4M2 CCP4M1 CCP4M0 CCP5M2 CCP5M1 CCP5M0 53 53
GIE/GIEH PEIE/GIEL IPEN PSPIF PSPIE PSPIP SSP2IF SSP2IE SSP2IP -- Timer2 Register Timer2 Period Register -- -- ADIF ADIE ADIP BCL2IF BCL2IE BCL2IP --
T2OUTPS3 T2OUTPS2 T2OUTPS1 T2OUTPS0 TMR2ON T2CKPS1 T2CKPS0
Timer4 Register Timer4 Period Register -- T4OUTPS3 T4OUTPS2 T4OUTPS1 T4OUTPS0 TMR4ON T4CKPS1 T4CKPS0 Capture/Compare/PWM Register 4 Low Byte Capture/Compare/PWM Register 4 High Byte Capture/Compare/PWM Register 5 Low Byte Capture/Compare/PWM Register 5 High Byte -- -- -- -- DC4B1 DC5B1 DC4B0 DC5B0
Legend: -- = unimplemented, read as `0'. Shaded cells are not used by PWM, Timer2 or Timer4.
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17.0 ENHANCED CAPTURE/ COMPARE/PWM (ECCP) MODULE
The control register for the Enhanced CCP module is shown in Register 17-1. It differs from the CCP4CON/ CCP5CON registers in that the two Most Significant bits are implemented to control PWM functionality. In addition to the expanded range of modes available through the Enhanced CCPxCON register, the ECCP modules each have two additional features associated with Enhanced PWM operation and auto-shutdown features. They are: * ECCPxDEL (Dead-Band Delay) * ECCPxAS (Auto-Shutdown Configuration)
In the PIC18F87J10 family of devices, three of the CCP modules are implemented as standard CCP modules with Enhanced PWM capabilities. These include the provision for 2 or 4 output channels, user-selectable polarity, dead-band control and automatic shutdown and restart. The Enhanced features are discussed in detail in Section 17.4 "Enhanced PWM Mode". Capture, Compare and single-output PWM functions of the ECCP module are the same as described for the standard CCP module.
REGISTER 17-1:
CCPxCON: ENHANCED CCP CONTROL REGISTER (ECCP1/ECCP2/ECCP3)
R/W-0 PxM1 bit 7 R/W-0 PxM0 R/W-0 DCxB1 R/W-0 DCxB0 R/W-0 CCPxM3 R/W-0 CCPxM2 R/W-0 CCPxM1 R/W-0 CCPxM0 bit 0
bit 7-6
PxM1:PxM0: Enhanced PWM Output Configuration bits If CCPxM3:CCPxM2 = 00, 01, 10: xx = PxA assigned as Capture/Compare input/output; PxB, PxC, PxD assigned as port pins If CCPxM3:CCPxM2 = 11: 00 = Single output: PxA modulated; PxB, PxC, PxD assigned as port pins 01 = Full-bridge output forward: P1D modulated; P1A active; P1B, P1C inactive 10 = Half-bridge output: P1A, P1B modulated with dead-band control; P1C, P1D assigned as port pins 11 = Full-bridge output reverse: P1B modulated; P1C active; P1A, P1D inactive DCxB1:DCxB0: PWM Duty Cycle bit 1 and bit 0 Capture mode: Unused. Compare mode: Unused. PWM mode: These bits are the two LSbs of the 10-bit PWM duty cycle. The eight MSbs of the duty cycle are found in CCPRxL. CCPxM3:CCPxM0: Enhanced CCP Mode Select bits 0000 = Capture/Compare/PWM off (resets ECCPx module) 0001 = Reserved 0010 = Compare mode, toggle output on match 0011 = Capture mode 0100 = Capture mode, every falling edge 0101 = Capture mode, every rising edge 0110 = Capture mode, every 4th rising edge 0111 = Capture mode, every 16th rising edge 1000 = Compare mode, initialize ECCP pin low, set output on compare match (set CCPxIF) 1001 = Compare mode, initialize ECCP pin high, clear output on compare match (set CCPxIF) 1010 = Compare mode, generate software interrupt only, ECCP pin reverts to I/O state 1011 = Compare mode, trigger special event (ECCP resets TMR1 or TMR3, sets CCPxIF bit, ECCP2 trigger also starts A/D conversion if A/D module is enabled)(1) 1100 = PWM mode; PxA, PxC active-high; PxB, PxD active-high 1101 = PWM mode; PxA, PxC active-high; PxB, PxD active-low 1110 = PWM mode; PxA, PxC active-low; PxB, PxD active-high 1111 = PWM mode; PxA, PxC active-low; PxB, PxD active-low Note 1: Implemented only for ECCP1 and ECCP2; same as `1010' for ECCP3. Legend: R = Readable bit -n = Value at POR W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown
bit 5-4
bit 3-0
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17.1 ECCP Outputs and Configuration
17.1.2
Each of the Enhanced CCP modules may have up to four PWM outputs, depending on the selected operating mode. These outputs, designated PxA through PxD, are multiplexed with various I/O pins. Some ECCP pin assignments are constant, while others change based on device configuration. For those pins that do change, the controlling bits are: * CCP2MX configuration bit * ECCPMX configuration bit (80-pin devices only) * Program Memory Operating mode, set by the EMB configuration bits (80-pin devices only) The pin assignments for the Enhanced CCP modules are summarized in Table 17-1, Table 17-2 and Table 17-3. To configure the I/O pins as PWM outputs, the proper PWM mode must be selected by setting the PxMx and CCPxMx bits (CCPxCON<7:6> and <3:0>, respectively). The appropriate TRIS direction bits for the corresponding port pins must also be set as outputs.
ECCP2 OUTPUTS AND PROGRAM MEMORY MODES
For 80-pin devices, the program memory mode of the device (Section 5.1.3 "PIC18F8XJ10/8XJ15 Program Memory Modes") also impacts pin multiplexing for the module. The ECCP2 input/output (ECCP2/P2A) can be multiplexed to one of three pins. The default assignment (CCP2MX configuration bit is set) for all devices is RC1. Clearing CCP2MX reassigns ECCP2/P2A to RE7. An additional option exists for 80-pin devices. When these devices are operating in Microcontroller mode, the multiplexing options described above still apply. In Extended Microcontroller mode, clearing CCP2MX reassigns ECCP2/P2A to RB3.
17.1.3
USE OF CCP4 AND CCP5 WITH ECCP1 AND ECCP3
17.1.1
ECCP1/ECCP3 OUTPUTS AND PROGRAM MEMORY MODE
In 80-pin devices, the use of Extended Microcontroller mode has an indirect effect on the use ECCP1 and ECCP3 in Enhanced PWM modes. By default, PWM outputs P1B/P1C and P3B/P3C are multiplexed to PORTE pins, along with the high-order byte of the external memory bus. When the bus is active in Extended Microcontroller mode, it overrides the Enhanced CCP outputs and makes them unavailable. Because of this, ECCP1 and ECCP3 can only be used in compatible (single-output) PWM modes when the device is in Extended Microcontroller mode and default pin configuration. An exception to this configuration is when a 12-bit address width is selected for the external bus (EMB1:EMB0 configuration bits = 01). In this case, the upper pins of PORTE continue to operate as digital I/O, even when the external bus is active; P1B/P1C and P3B/P3C remain available for use as Enhanced PWM outputs. If an application requires the use of additional PWM outputs during Enhanced microcontroller operation, the P1B/P1C and P3B/P3C outputs can be reassigned to the upper bits of PORTH. This is done by clearing the ECCPMX configuration bit.
Only the ECCP2 module has four dedicated output pins that are available for use. Assuming that the I/O ports or other multiplexed functions on those pins are not needed, they may be used whenever needed without interfering with any other CCP module. ECCP1 and ECCP3, on the other hand, only have three dedicated output pins: ECCPx/PxA, PxB and PxC. Whenever these modules are configured for Quad PWM mode, the pin normally used for CCP4 or CCP5 becomes the PxD output pins for ECCP3 and ECCP1, respectively. The CCP4 and CCP5 modules remain functional but their outputs are overridden.
17.1.4
ECCP MODULES AND TIMER RESOURCES
Like the standard CCP modules, the ECCP modules can utilize Timers 1, 2, 3 or 4, depending on the mode selected. Timer1 and Timer3 are available for modules in Capture or Compare modes, while Timer2 and Timer4 are available for modules in PWM mode. Additional details on timer resources are provided in Section 16.1.1 "CCP Modules and Timer Resources".
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TABLE 17-1:
ECCP Mode
PIN CONFIGURATIONS FOR ECCP1
CCP1CON Configuration RC2 RE6 RE5 RG4 RH7 RH6
All PIC18F6XJ10/6XJ15 Devices: Compatible CCP Dual PWM Quad PWM Compatible CCP Dual PWM Quad PWM Compatible CCP 00xx 11xx 10xx 11xx x1xx 11xx 00xx 11xx 10xx 11xx x1xx 11xx 00xx 11xx ECCP1 P1A P1A ECCP1 P1A P1A ECCP1 RE6 P1B P1B RE6/AD14 RE6/AD14 RE6/AD14 RE6/AD14 RE5 RE5 P1C RE5/AD13 RE5/AD13 RE5/AD13 RE5/AD13 RG4/CCP5 RG4/CCP5 P1D RG4/CCP5 RG4/CCP5 P1D RG4/CCP5 N/A N/A N/A RH7/AN15 P1B P1B RH7/AN15 N/A N/A N/A RH6/AN14 RH6/AN14 P1C RH6/AN14
PIC18F8XJ10/8XJ15 Devices, ECCPMX = 0, Microcontroller mode:
PIC18F8XJ10/8XJ15 Devices, ECCPMX = 1, Extended Microcontroller mode, 16-bit or 20-bit Address Width: PIC18F8XJ10/8XJ15 Devices, ECCPMX = 1, Microcontroller mode or Extended Microcontroller mode, 12-bit Address Width: Compatible CCP Dual PWM Quad PWM Legend: Note 1: 00xx 11xx 10xx 11xx x1xx 11xx ECCP1 P1A P1A RE6/AD14 P1B P1B RE5/AD13 RE5/AD13 P1C RG4/CCP5 RG4/CCP5 P1D RH7/AN15 RH7/AN15 RH7/AN15 RH6/AN14 RH6/AN14 RH6/AN14
x = Don't care, N/A = Not available. Shaded cells indicate pin assignments not used by ECCP1 in a given mode. With ECCP1 in Quad PWM mode, CCP5's output is overridden by P1D; otherwise, CCP5 is fully operational.
TABLE 17-2:
ECCP Mode
PIN CONFIGURATIONS FOR ECCP2
CCP2CON Configuration RB3 RC1 RE7 RE2 RE1 RE0
All Devices, CCP2MX = 1, either operating mode: Compatible CCP Dual PWM Quad PWM Compatible CCP Dual PWM Quad PWM Compatible CCP Dual PWM Quad PWM 00xx 11xx 10xx 11xx x1xx 11xx 00xx 11xx 10xx 11xx x1xx 11xx 00xx 11xx 10xx 11xx x1xx 11xx RB3/INT3 RB3/INT3 RB3/INT3 RB3/INT3 RB3/INT3 RB3/INT3 ECCP2 P2A P2A ECCP2 P2A P2A RC1/T1OS1 RC1/T1OS1 RC1/T1OS1 RC1/T1OS1 RC1/T1OS1 RC1/T1OS1 RE7 RE7 RE7 ECCP2 P2A P2A RE7/AD15 RE7/AD15 RE7/AD15 RE2 P2B P2B RE2 P2B P2B RE2/CS P2B P2B RE1 RE1 P2C RE1 RE1 P2C RE1/WR RE1/WR P2C RE0 RE0 P2D RE0 RE0 P2D RE0/RD RE0/RD P2D
All Devices, CCP2MX = 0, Microcontroller mode:
PIC18F8XJ10/8XJ15 Devices, CCP2MX = 0, Extended Microcontroller mode:
Legend: x = Don't care. Shaded cells indicate pin assignments not used by ECCP2 in a given mode.
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TABLE 17-3:
ECCP Mode
PIN CONFIGURATIONS FOR ECCP3
CCP3CON Configuration RG0 RE4 RE3 RG3 RH5 RH4
All PIC18F6XJ10/6XJ15 Devices: Compatible CCP Dual PWM Quad PWM Compatible CCP Dual PWM Quad PWM Compatible CCP 00xx 11xx 10xx 11xx x1xx 11xx 00xx 11xx 10xx 11xx x1xx 11xx 00xx 11xx ECCP3 P3A P3A ECCP3 P3A P3A ECCP3 RE4 P3B P3B RE6/AD14 RE6/AD14 RE6/AD14 RE6/AD14 RE3 RE3 P3C RE5/AD13 RE5/AD13 RE5/AD13 RE5/AD13 RG3/CCP4 RG3/CCP4 P3D RG3/CCP4 RG3/CCP4 P3D RG3/CCP4 N/A N/A N/A RH7/AN15 P3B P3B RH7/AN15 N/A N/A N/A RH6/AN14 RH6/AN14 P3C RH6/AN14
PIC18F8XJ10/8XJ15 Devices, ECCPMX = 0, Microcontroller mode:
PIC18F8XJ10/8XJ15 Devices, ECCPMX = 1, Extended Microcontroller mode, 16-bit or 20-bit Address Width: PIC18F8XJ10/8XJ15 Devices, ECCPMX = 1, Microcontroller mode or Extended Microcontroller mode, 12-bit Address Width: Compatible CCP Dual PWM Quad PWM Legend: Note 1: 00xx 11xx 10xx 11xx x1xx 11xx ECCP3 P3A P3A RE4/AD12 P3B P3B RE3/AD11 RE3/AD11 P3C RG3/CCP4 RG3/CCP4 P3D RH5/AN13 RH5/AN13 RH5/AN13 RH4/AN12 RH4/AN12 RH4/AN12
x = Don't care, N/A = Not available. Shaded cells indicate pin assignments not used by ECCP3 in a given mode. With ECCP3 in Quad PWM mode, CCP4's output is overridden by P1D; otherwise, CCP4 is fully operational.
17.2
Capture and Compare Modes
Except for the operation of the Special Event Trigger discussed below, the Capture and Compare modes of the ECCP module are identical in operation to that of CCP4. These are discussed in detail in Section 16.2 "Capture Mode" and Section 16.3 "Compare Mode".
Special Event Triggers are not implemented for ECCP3, CCP4 or CCP5. Selecting the Special Event mode for these modules has the same effect as selecting the Compare with Software Interrupt mode (CCPxM3:CCPxM0 = 1010). Note: The Special Event Trigger from ECCP2 will not set the Timer1 or Timer3 interrupt flag bits.
17.2.1
SPECIAL EVENT TRIGGER
ECCP1 and ECCP2 incorporate an internal hardware trigger that is generated in Compare mode on a match between the CCPRx register pair and the selected timer. This can be used in turn to initiate an action. This mode is selected by setting CCPxCON<3:0> to `1011'. The Special Event Trigger output of either ECCP1 or ECCP2 resets the TMR1 or TMR3 register pair, depending on which timer resource is currently selected. This allows the CCPRx register to effectively be a 16-bit programmable period register for Timer1 or Timer3. In addition, the ECCP2 Special Event Trigger will also start an A/D conversion if the A/D module is enabled.
17.3
Standard PWM Mode
When configured in Single Output mode, the ECCP module functions identically to the standard CCP module in PWM mode as described in Section 16.4 "PWM Mode". This is also sometimes referred to as "Compatible CCP" mode as in Tables 17-1 through 17-3. Note: When setting up single-output PWM operations, users are free to use either of the processes described in Section 16.4.3 "Setup for PWM Operation" or Section 17.4.9 "Setup for PWM Operation". The latter is more generic but will work for either single or multi-output PWM.
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17.4 Enhanced PWM Mode
The Enhanced PWM mode provides additional PWM output options for a broader range of control applications. The module is a backward compatible version of the standard CCP module and offers up to four outputs, designated PxA through PxD. Users are also able to select the polarity of the signal (either active-high or active-low). The module's output mode and polarity are configured by setting the PxM1:PxM0 and CCPxM3CCPxM0 bits of the CCPxCON register (CCPxCON<7:6> and CCPxCON<3:0>, respectively). For the sake of clarity, Enhanced PWM mode operation is described generically throughout this section with respect to ECCP1 and TMR2 modules. Control register names are presented in terms of ECCP1. All three Enhanced modules, as well as the two timer resources, can be used interchangeably and function identically. TMR2 or TMR4 can be selected for PWM operation by selecting the proper bits in T3CON. Figure 17-1 shows a simplified block diagram of PWM operation. All control registers are double-buffered and are loaded at the beginning of a new PWM cycle (the period boundary when Timer2 resets) in order to prevent glitches on any of the outputs. The exception is the PWM Delay register, ECCP1DEL, which is loaded at either the duty cycle boundary or the boundary period (whichever comes first). Because of the buffering, the module waits until the assigned timer resets instead of starting immediately. This means that Enhanced PWM waveforms do not exactly match the standard PWM waveforms but are instead offset by one full instruction cycle (4 TOSC). As before, the user must manually configure the appropriate TRIS bits for output.
17.4.1
PWM PERIOD
The PWM period is specified by writing to the PR2 register. The PWM period can be calculated using the equation:
EQUATION 17-1:
PWM Period = [(PR2) + 1] * 4 * TOSC * (TMR2 Prescale Value) PWM frequency is defined as 1/[PWM period]. When TMR2 is equal to PR2, the following three events occur on the next increment cycle: * TMR2 is cleared * The ECCP1 pin is set (if PWM duty cycle = 0%, the ECCP1 pin will not be set) * The PWM duty cycle is copied from CCPR1L into CCPR1H Note: The Timer2 postscaler (see Section 13.0 "Timer2 Module") is not used in the determination of the PWM frequency. The postscaler could be used to have a servo update rate at a different frequency than the PWM output.
FIGURE 17-1:
SIMPLIFIED BLOCK DIAGRAM OF THE ENHANCED PWM MODULE
CCP1CON<5:4> P1M1<1:0> 2 CCP1M<3:0> 4
Duty Cycle Registers CCPR1L
ECCP1/P1A TRISx CCPR1H (Slave) P1B R Q Output Controller P1C TMR2 (Note 1) S Comparator Clear Timer, set ECCP1 pin and latch D.C. ECCP1DEL P1D TRISx TRISx TRISx
ECCP1/P1A
P1B
Comparator
P1C
P1D
PR2
Note: The 8-bit timer TMR2 register is concatenated with the 2-bit internal Q clock, or 2 bits of the prescaler, to create the 10-bit time base.
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17.4.2 PWM DUTY CYCLE
Note: The PWM duty cycle is specified by writing to the CCPR1L register and to the CCP1CON<5:4> bits. Up to 10-bit resolution is available. The CCPR1L contains the eight MSbs and the CCP1CON<5:4> contains the two LSbs. This 10-bit value is represented by CCPRxL:CCPxCON<5:4>. The PWM duty cycle is calculated by the equation: If the PWM duty cycle value is longer than the PWM period, the ECCP1 pin will not be cleared.
17.4.3
PWM OUTPUT CONFIGURATIONS
The P1M1:P1M0 bits in the CCP1CON register allow one of four configurations: * * * * Single Output Half-Bridge Output Full-Bridge Output, Forward mode Full-Bridge Output, Reverse mode
EQUATION 17-2:
PWM Duty Cycle = (CCPR1L:CCP1CON<5:4>) * TOSC * (TMR2 Prescale Value) CCPR1L and CCP1CON<5:4> can be written to at any time but the duty cycle value is not copied into CCPR1H until a match between PR2 and TMR2 occurs (i.e., the period is complete). In PWM mode, CCPR1H is a read-only register. The CCPRxH register and a 2-bit internal latch are used to double-buffer the PWM duty cycle. This double-buffering is essential for glitchless PWM operation. When the CCPR1H and 2-bit latch match TMR2, concatenated with an internal 2-bit Q clock or two bits of the TMR2 prescaler, the ECCP1 pin is cleared. The maximum PWM resolution (bits) for a given PWM frequency is given by the equation:
The Single Output mode is the standard PWM mode discussed in Section 17.4 "Enhanced PWM Mode". The Half-Bridge and Full-Bridge Output modes are covered in detail in the sections that follow. The general relationship of the outputs in all configurations is summarized in Figure 17-2.
EQUATION 17-3:
log FOSC FPWM PWM Resolution (max) = log(2)
(
) bits
TABLE 17-4:
EXAMPLE PWM FREQUENCIES AND RESOLUTIONS AT 40 MHz
2.44 kHz 16 FFh 10 9.77 kHz 4 FFh 10 39.06 kHz 1 FFh 10 156.25 kHz 1 3Fh 8 312.50 kHz 1 1Fh 7 416.67 kHz 1 17h 6.58
PWM Frequency Timer Prescaler (1, 4, 16) PR2 Value Maximum Resolution (bits)
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FIGURE 17-2: PWM OUTPUT RELATIONSHIPS (ACTIVE-HIGH STATE)
0 CCP1CON<7:6> SIGNAL Duty Cycle Period 00 (Single Output) P1A Modulated P1A Modulated 10 (Half-Bridge) P1B Modulated P1A Active (Full-Bridge, Forward) P1B Inactive P1C Inactive P1D Modulated P1A Inactive 11 (Full-Bridge, Reverse) P1B Modulated P1C Active P1D Inactive PR2 + 1
Delay(1)
Delay(1)
01
FIGURE 17-3:
PWM OUTPUT RELATIONSHIPS (ACTIVE-LOW STATE)
SIGNAL 0 Duty Cycle Period PR2 + 1
CCP1CON<7:6>
00
(Single Output)
P1A Modulated P1A Modulated
10
(Half-Bridge)
Delay(1) P1B Modulated P1A Active
Delay(1)
01
(Full-Bridge, Forward)
P1B Inactive P1C Inactive P1D Modulated P1A Inactive
11
(Full-Bridge, Reverse)
P1B Modulated P1C Active P1D Inactive
Relationships: * Period = 4 * TOSC * (PR2 + 1) * (TMR2 Prescale Value) * Duty Cycle = TOSC * (CCPR1L<7:0>:CCP1CON<5:4>) * (TMR2 Prescale Value) * Delay = 4 * TOSC * (ECCP1DEL<6:0>) Note 1: Dead-band delay is programmed using the ECCP1DEL register (Section 17.4.6 "Programmable Dead-Band Delay").
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17.4.4 HALF-BRIDGE MODE FIGURE 17-4:
Period Duty Cycle P1A(2) td P1B(2)
(1)
In the Half-Bridge Output mode, two pins are used as outputs to drive push-pull loads. The PWM output signal is output on the P1A pin, while the complementary PWM output signal is output on the P1B pin (Figure 17-4). This mode can be used for half-bridge applications, as shown in Figure 17-5, or for full-bridge applications, where four power switches are being modulated with two PWM signals. In Half-Bridge Output mode, the programmable dead-band delay can be used to prevent shoot-through current in half-bridge power devices. The value of bits PDC6:PDC0 sets the number of instruction cycles before the output is driven active. If the value is greater than the duty cycle, the corresponding output remains inactive during the entire cycle. See Section 17.4.6 "Programmable Dead-Band Delay" for more details on dead-band delay operations. Since the P1A and P1B outputs are multiplexed with the PORTC<2> and PORTE<6> data latches, the TRISC<2> and TRISE<6> bits must be cleared to configure P1A and P1B as outputs.
HALF-BRIDGE PWM OUTPUT
Period
td
(1)
(1)
td = Dead Band Delay Note 1: At this time, the TMR2 register is equal to the PR2 register. 2: Output signals are shown as active-high.
FIGURE 17-5:
EXAMPLES OF HALF-BRIDGE OUTPUT MODE APPLICATIONS
V+
Standard Half-Bridge Circuit ("Push-Pull") PIC18F87J10 P1A FET Driver
+ V Load
FET Driver P1B
+ V -
Half-Bridge Output Driving a Full-Bridge Circuit V+ PIC18F87J10 FET Driver P1A
V-
FET Driver
FET Driver P1B
Load
FET Driver
V-
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17.4.5 FULL-BRIDGE MODE
In Full-Bridge Output mode, four pins are used as outputs; however, only two outputs are active at a time. In the Forward mode, pin P1A is continuously active and pin P1D is modulated. In the Reverse mode, pin P1C is continuously active and pin P1B is modulated. These are illustrated in Figure 17-6. P1A, P1B, P1C and P1D outputs are multiplexed with the PORTC<2>, PORTE<6:5> and PORTG<4> data latches. The TRISC<2>, TRISC<6:5> and TRISG<4> bits must be cleared to make the P1A, P1B, P1C and P1D pins outputs.
FIGURE 17-6:
Forward Mode
FULL-BRIDGE PWM OUTPUT
Period P1A(2) Duty Cycle P1B(2)
P1C(2)
P1D(2) (1) Reverse Mode Period Duty Cycle P1A(2) P1B(2) P1C(2) (1)
P1D(2) (1) Note 1: At this time, the TMR2 register is equal to the PR2 register. Note 2: Output signal is shown as active-high. (1)
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FIGURE 17-7: EXAMPLE OF FULL-BRIDGE APPLICATION
V+
PIC18F87J10 P1A
FET Driver
QA
QC
FET Driver
P1B FET Driver
Load FET Driver
P1C
QB
QD
VP1D
17.4.5.1
Direction Change in Full-Bridge Mode
1. 2.
In the Full-Bridge Output mode, the P1M1 bit in the CCP1CON register allows users to control the forward/ reverse direction. When the application firmware changes this direction control bit, the module will assume the new direction on the next PWM cycle. Just before the end of the current PWM period, the modulated outputs (P1B and P1D) are placed in their inactive state, while the unmodulated outputs (P1A and P1C) are switched to drive in the opposite direction. This occurs in a time interval of (4 TOSC * (Timer2 Prescale Value) before the next PWM period begins. The Timer2 prescaler will be either 1, 4 or 16, depending on the value of the T2CKPS bit (T2CON<1:0>). During the interval from the switch of the unmodulated outputs to the beginning of the next period, the modulated outputs (P1B and P1D) remain inactive. This relationship is shown in Figure 17-8. Note that in the Full-Bridge Output mode, the ECCP1 module does not provide any dead-band delay. In general, since only one output is modulated at all times, dead-band delay is not required. However, there is a situation where a dead-band delay might be required. This situation occurs when both of the following conditions are true:
The direction of the PWM output changes when the duty cycle of the output is at or near 100%. The turn-off time of the power switch, including the power device and driver circuit, is greater than the turn-on time.
Figure 17-9 shows an example where the PWM direction changes from forward to reverse at a near 100% duty cycle. At time t1, the outputs P1A and P1D become inactive, while output P1C becomes active. In this example, since the turn-off time of the power devices is longer than the turn-on time, a shoot-through current may flow through power devices QC and QD (see Figure 17-7) for the duration of `t'. The same phenomenon will occur to power devices QA and QB for PWM direction change from reverse to forward. If changing PWM direction at high duty cycle is required for an application, one of the following requirements must be met: 1. 2. Reduce PWM for a PWM period before changing directions. Use switch drivers that can drive the switches off faster than they can drive them on.
Other options to prevent shoot-through current may exist.
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FIGURE 17-8:
SIGNAL
PWM DIRECTION CHANGE
Period(1) Period
P1A (Active-High) P1B (Active-High) DC P1C (Active-High) P1D (Active-High) DC Note 1: The direction bit in the ECCP1 Control register (CCP1CON<7>) is written at any time during the PWM cycle. 2: When changing directions, the P1A and P1C signals switch before the end of the current PWM cycle at intervals of 4 TOSC, 16 TOSC or 64 TOSC, depending on the Timer2 prescaler value. The modulated P1B and P1D signals are inactive at this time. (Note 2)
FIGURE 17-9:
PWM DIRECTION CHANGE AT NEAR 100% DUTY CYCLE
Forward Period t1 Reverse Period
P1A(1) P1B(1) P1C(1) P1D(1) DC
DC tON(2)
External Switch C(1) tOFF(3) External Switch D(1) Potential Shoot-Through Current(1) Note 1: All signals are shown as active-high. 2: tON is the turn-on delay of power switch QC and its driver. 3: tOFF is the turn-off delay of power switch QD and its driver. t = tOFF - tON(2,3)
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17.4.6 PROGRAMMABLE DEAD-BAND DELAY
In half-bridge applications, where all power switches are modulated at the PWM frequency at all times, the power switches normally require more time to turn off than to turn on. If both the upper and lower power switches are switched at the same time (one turned on and the other turned off), both switches may be on for a short period of time until one switch completely turns off. During this brief interval, a very high current (shoot-through current) may flow through both power switches, shorting the bridge supply. To avoid this potentially destructive shoot-through current from flowing during switching, turning on either of the power switches is normally delayed to allow the other switch to completely turn off. In the Half-Bridge Output mode, a digitally programmable dead-band delay is available to avoid shoot-through current from destroying the bridge power switches. The delay occurs at the signal transition from the non-active state to the active state. See Figure 17-4 for illustration. The lower seven bits of the ECCPxDEL register (Register 17-2) set the delay period in terms of microcontroller instruction cycles (TCY or 4 TOSC). A shutdown event can be caused by either of the two comparator modules or the INT0 pin (or any combination of these three sources). The comparators may be used to monitor a voltage input proportional to a current being monitored in the bridge circuit. If the voltage exceeds a threshold, the comparator switches state and triggers a shutdown. Alternatively, a digital signal on the INT0 pin can also trigger a shutdown. The auto-shutdown feature can be disabled by not selecting any auto-shutdown sources. The auto-shutdown sources to be used are selected using the ECCP1AS2:ECCP1AS0 bits (bits<6:4> of the ECCP1AS register). When a shutdown occurs, the output pins are asynchronously placed in their shutdown states, specified by the PSS1AC1:PSS1AC0 and PSS1BD1:PSS1BD0 bits (ECCP1AS3:ECCP1AS0). Each pin pair (P1A/P1C and P1B/P1D) may be set to drive high, drive low or be tri-stated (not driving). The ECCP1ASE bit (ECCP1AS<7>) is also set to hold the Enhanced PWM outputs in their shutdown states. The ECCP1ASE bit is set by hardware when a shutdown event occurs. If automatic restarts are not enabled, the ECCPASE bit is cleared by firmware when the cause of the shutdown clears. If automatic restarts are enabled, the ECCPASE bit is automatically cleared when the cause of the auto-shutdown has cleared. If the ECCPASE bit is set when a PWM period begins, the PWM outputs remain in their shutdown state for that entire PWM period. When the ECCPASE bit is cleared, the PWM outputs will return to normal operation at the beginning of the next PWM period. Note: Writing to the ECCPASE bit is disabled while a shutdown condition is active.
17.4.7
ENHANCED PWM AUTO-SHUTDOWN
When the ECCP1 is programmed for any of the Enhanced PWM modes, the active output pins may be configured for auto-shutdown. Auto-shutdown immediately places the Enhanced PWM output pins into a defined shutdown state when a shutdown event occurs.
REGISTER 17-2:
ECCPxDEL: PWM CONFIGURATION REGISTER
R/W-0 PxRSEN bit 7 R/W-0 PxDC6 R/W-0 PxDC5 R/W-0 PxDC4 R/W-0 PxDC3 R/W-0 PxDC2 R/W-0 PxDC1 R/W-0 PxDC0 bit 0
bit 7
PxRSEN: PWM Restart Enable bit 1 = Upon auto-shutdown, the ECCPxASE bit clears automatically once the shutdown event goes away; the PWM restarts automatically 0 = Upon auto-shutdown, ECCPxASE must be cleared in software to restart the PWM PxDC6:PxDC0: PWM Delay Count bits Delay time, in number of FOSC/4 (4 * TOSC) cycles, between the scheduled and actual time for a PWM signal to transition to active. Legend: R = Readable bit -n = Value at POR W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown
bit 6-0
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REGISTER 17-3: ECCPxAS: ENHANCED CCP AUTO-SHUTDOWN CONTROL REGISTER
R/W-0 bit 7 bit 7 ECCPxASE: ECCP Auto-Shutdown Event Status bit 0 = ECCP outputs are operating 1 = A shutdown event has occurred; ECCP outputs are in shutdown state ECCPxAS2:ECCPxAS0: ECCP Auto-Shutdown Source Select bits 000 = Auto-shutdown is disabled 001 = Comparator 1 output 010 = Comparator 2 output 011 = Either Comparator 1 or 2 100 = INT0 101 = INT0 or Comparator 1 110 = INT0 or Comparator 2 111 = INT0 or Comparator 1 or Comparator 2 PSSxAC1:PSSxAC0: Pins A and C Shutdown State Control bits 00 = Drive Pins A and C to `0' 01 = Drive Pins A and C to `1' 1x = Pins A and C tri-state PSSxBD1:PSSxBD0: Pins B and D Shutdown State Control bits 00 = Drive Pins B and D to `0' 01 = Drive Pins B and D to `1' 1x = Pins B and D tri-state Legend: R = Readable bit -n = Value at POR W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 bit 0 ECCPxASE ECCPxAS2 ECCPxAS1 ECCPxAS0 PSSxAC1 PSSxAC0 PSSxBD1 PSSxBD0
bit 6-4
bit 3-2
bit 1-0
17.4.7.1
Auto-Shutdown and Automatic Restart
The Auto-Shutdown mode can be forced by writing a `1' to the ECCPASE bit.
The auto-shutdown feature can be configured to allow automatic restarts of the module following a shutdown event. This is enabled by setting the P1RSEN bit of the ECCP1DEL register (ECCP1DEL<7>). In Shutdown mode with P1RSEN = 1 (Figure 17-10), the ECCPASE bit will remain set for as long as the cause of the shutdown continues. When the shutdown condition clears, the ECCP1ASE bit is cleared. If P1RSEN = 0 (Figure 17-11), once a shutdown condition occurs, the ECCP1ASE bit will remain set until it is cleared by firmware. Once ECCP1ASE is cleared, the Enhanced PWM will resume at the beginning of the next PWM period. Note: Writing to the ECCPASE bit is disabled while a shutdown condition is active.
17.4.8
START-UP CONSIDERATIONS
When the ECCP module is used in the PWM mode, the application hardware must use the proper external pull-up and/or pull-down resistors on the PWM output pins. When the microcontroller is released from Reset, all of the I/O pins are in the high-impedance state. The external circuits must keep the power switch devices in the OFF state until the microcontroller drives the I/O pins with the proper signal levels, or activates the PWM output(s). The CCP1M1:CCP1M0 bits (CCP1CON<1:0>) allow the user to choose whether the PWM output signals are active-high or active-low for each pair of PWM output pins (P1A/P1C and P1B/P1D). The PWM output polarities must be selected before the PWM pins are configured as outputs. Changing the polarity configuration while the PWM pins are configured as outputs is not recommended since it may result in damage to the application circuits.
Independent of the P1RSEN bit setting, if the auto-shutdown source is one of the comparators, the shutdown condition is a level. The ECCP1ASE bit cannot be cleared as long as the cause of the shutdown persists.
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The P1A, P1B, P1C and P1D output latches may not be in the proper states when the PWM module is initialized. Enabling the PWM pins for output at the same time as the ECCP module may cause damage to the application circuit. The ECCP module must be enabled in the proper output mode and complete a full PWM cycle before configuring the PWM pins as outputs. The completion of a full PWM cycle is indicated by the TMR2IF bit being set as the second PWM period begins.
FIGURE 17-10:
PWM AUTO-SHUTDOWN (P1RSEN = 1, AUTO-RESTART ENABLED)
PWM Period
Shutdown Event ECCPASE bit PWM Activity Normal PWM Start of PWM Period Shutdown Shutdown Event Occurs Event Clears PWM Resumes
FIGURE 17-11:
PWM AUTO-SHUTDOWN (P1RSEN = 0, AUTO-RESTART DISABLED)
PWM Period
Shutdown Event ECCPASE bit PWM Activity Normal PWM Start of PWM Period ECCPASE Cleared by Shutdown Shutdown Firmware PWM Event Occurs Event Clears Resumes
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17.4.9 SETUP FOR PWM OPERATION
8. The following steps should be taken when configuring the ECCPx module for PWM operation: 1. Configure the PWM pins PxA and PxB (and PxC and PxD, if used) as inputs by setting the corresponding TRIS bits. Set the PWM period by loading the PR2 (PR4) register. Configure the ECCPx module for the desired PWM mode and configuration by loading the CCPxCON register with the appropriate values: * Select one of the available output configurations and direction with the PxM1:PxM0 bits. * Select the polarities of the PWM output signals with the CCPxM3:CCPxM0 bits. Set the PWM duty cycle by loading the CCPRxL register and the CCPxCON<5:4> bits. For auto-shutdown: * Disable auto-shutdown; ECCPAS = 0 * Configure auto-shutdown source * Wait for Run condition For Half-Bridge Output mode, set the dead-band delay by loading ECCPxDEL<6:0> with the appropriate value. If auto-shutdown operation is required, load the ECCPxAS register: * Select the auto-shutdown sources using the ECCPxAS2:ECCPxAS0 bits. * Select the shutdown states of the PWM output pins using PSSxAC1:PSSxAC0 and PSSxBD1:PSSxBD0 bits. * Set the ECCPxASE bit (ECCPxAS<7>). If auto-restart operation is required, set the PxRSEN bit (ECCPxDEL<7>). 9. Configure and start TMRn (TMR2 or TMR4): * Clear the TMRn interrupt flag bit by clearing the TMRnIF bit (PIR1<1> for Timer2 or PIR3<3> for Timer4). * Set the TMRn prescale value by loading the TnCKPS bits (TnCON<1:0>). * Enable Timer2 (or Timer4) by setting the TMRnON bit (TnCON<2>). 10. Enable PWM outputs after a new PWM cycle has started: * Wait until TMRn overflows (TMRnIF bit is set). * Enable the ECCPx/PxA, PxB, PxC and/or PxD pin outputs by clearing the respective TRIS bits. * Clear the ECCPASE bit (ECCPxAS<7>).
2. 3.
4. 5.
17.4.10
EFFECTS OF A RESET
Both Power-on Reset and subsequent Resets will force all ports to Input mode and the CCP registers to their Reset states. This forces the Enhanced CCP module to reset to a state compatible with the standard CCP module.
6.
7.
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TABLE 17-5:
Name INTCON RCON PIR1 PIE1 IPR1 PIR2 PIE2 IPR2 PIR3 PIE3 IPR3 TRISB TRISC TRISE TRISG TRISH TMR1L TMR1H T1CON TMR2 T2CON PR2 TMR3L TMR3H T3CON TMR4 T4CON PR4 CCPRxL
(1)
REGISTERS ASSOCIATED WITH ECCP MODULES AND TIMER1 TO TIMER4
Bit 7 GIE/GIEH IPEN PSPIF PSPIE PSPIP OSCFIF OSCFIE OSCFIP SSP2IF SSP2IE SSP2IP TRISB7 TRISC7 TRISE7 -- TRISH7 Bit 6 PEIE/GIEL -- ADIF ADIE ADIP CMIF CMIE CMIP BCL2IF BCL2IE BCL2IP TRISB6 TRISC6 TRISE6 -- TRISH6 Bit 5 TMR0IE -- RC1IF RC1IE RC1IP -- -- -- RC2IF RC2IE RC2IP TRISB5 TRISC5 TRISE5 -- TRISH5 Bit 4 INT0IE RI TX1IF TX1IE TX1IP -- -- -- TX2IF TX2IE TX2IP TRISB4 TRISC4 TRISE4 TRISG4 TRISH4 Bit 3 RBIE TO SSP1IF SSP1IE SSP1IP BCL1IF BCL1IE BCL1IP TMR4IF TMR4IE TMR4IP TRISB3 TRISC3 TRISE3 TRISG3 TRISH3 Bit 2 TMR0IF PD CCP1IF CCP1IE CCP1IP -- -- -- CCP5IF CCP5IE CCP5IP TRISB2 TRISC2 TRISE2 TRISG2 TRISH2 Bit 1 INT0IF POR TMR2IF TMR2IE TMR2IP TMR3IF TMR3IE TMR3IP CCP4IF CCP4IE CCP4IP TRISB1 TRISC1 TRISE1 TRISG1 TRISH1 Bit 0 RBIF BOR TMR1IF TMR1IE TMR1IP CCP2IF CCP2IE CCP2IP CCP3IF CCP3IE CCP3IP TRISB0 TRISC0 TRISE0 TRISG0 TRISH0 Reset Values on page 49 50 51 51 51 51 51 51 51 51 51 52 52 52 52 52 50 50 T1CKPS1 T1CKPS0 T1OSCEN T1SYNC TMR1CS TMR1ON 50 50 50 50 51 51 T3CKPS1 T3CKPS0 T3CCP1 T3SYNC TMR3CS TMR3ON 51 53 53 53 51 51, CCPxM3 PxDC3 CCPxM2 PxDC2 CCPxM1 PxDC1 CCPxM0 PxDC0 51 51, 53 53 PSSxAC1 PSSxAC0 PSSxBD1 PSSxBD0
Timer1 Register Low Byte Timer1 Register High Byte RD16 -- T1RUN Timer2 Register T2OUTPS3 T2OUTPS2 T2OUTPS1 T2OUTPS0 TMR2ON T2CKPS1 T2CKPS0 Timer2 Period Register Timer3 Register Low Byte Timer3 Register High Byte RD16 -- T3CCP2 Timer4 Register T4OUTPS3 T4OUTPS2 T4OUTPS1 T4OUTPS0 TMR4ON T4CKPS1 T4CKPS0 Timer4 Period Register Capture/Compare/PWM Register x Low Byte Capture/Compare/PWM Register x High Byte PxM1 PxRSEN PxM0 PxDC6 DCxB1 PxDC5 DCxB0 PxDC4 ECCPxASE ECCPxAS2 ECCPxAS1 ECCPxAS0
CCPRxH(1) CCPxCON(1) ECCPxAS Legend: Note 1:
(1)
ECCPxDEL(1)
-- = unimplemented, read as `0'. Shaded cells are not used during ECCP operation. Generic term for all of the identical registers of this name for all Enhanced CCP modules, where `x' identifies the individual module (ECCP1, ECCP2 or ECCP3). Bit assignments and Reset values for all registers of the same generic name are identical.
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18.0 MASTER SYNCHRONOUS SERIAL PORT (MSSP) MODULE
Master SSP (MSSP) Module Overview 18.3 SPI Mode
The SPI mode allows 8 bits of data to be synchronously transmitted and received simultaneously. All four modes of SPI are supported. To accomplish communication, typically three pins are used: * Serial Data Out (SDOx) - RC5/SDO1 or RD4/SDO2 * Serial Data In (SDIx) - RC4/SDI1/SDA1 or RD5/SDI2/SDA2 * Serial Clock (SCKx) - RC3/SCK1/SCL1 or RD6/SCK2/SCL2 Additionally, a fourth pin may be used when in a Slave mode of operation: * Slave Select (SSx) - RF7/SS1 or RD7/SS2 Figure 18-1 shows the block diagram of the MSSP module when operating in SPI mode.
18.1
The Master Synchronous Serial Port (MSSP) module is a serial interface, useful for communicating with other peripheral or microcontroller devices. These peripheral devices may be serial EEPROMs, shift registers, display drivers, A/D converters, etc. The MSSP module can operate in one of two modes: * Serial Peripheral Interface (SPITM) * Inter-Integrated Circuit (I2CTM) - Full Master mode - Slave mode (with general address call) The I2C interface supports the following modes in hardware: * Master mode * Multi-Master mode * Slave mode All members of the PIC18F87J10 family have two MSSP modules, designated as MSSP1 and MSSP2. Each module operates independently of the other. Note: Throughout this section, generic references to an MSSP module in any of its operating modes may be interpreted as being equally applicable to MSSP1 or MSSP2. Register names and module I/O signals use the generic designator `x' to indicate the use of a numeral to distinguish a particular module, when required. Control bit names are not individuated.
FIGURE 18-1:
MSSP BLOCK DIAGRAM (SPITM MODE)
Internal Data Bus Read SSPxBUF reg Write
RC4 or RD5 SSPxSR reg RC5 or RD4 bit 0 Shift Clock
RF7 or RD7
SSx Control Enable Edge Select 2 Clock Select SSPM3:SSPM0 SMP:CKE 4 TMR2 Output 2 2 Edge Select Prescaler TOSC 4, 16, 64
18.2
Control Registers
Each MSSP module has three associated control registers. These include a status register (SSPxSTAT) and two control registers (SSPxCON1 and SSPxCON2). The use of these registers and their individual configuration bits differ significantly depending on whether the MSSP module is operated in SPI or I2C mode. Additional details are provided under the individual sections. Note: In devices with more than one MSSP module, it is very important to pay close attention to SSPCON register names. SSP1CON1 and SSP1CON2 control different operational aspects of the same module, while SSP1CON1 and SSP2CON1 control the same features for two different modules.
RC3 or RD6
(
)
Data to TXx/RXx in SSPxSR TRIS bit Note: Only port I/O names are used in this diagram for the sake of brevity. Refer to the text for a full list of multiplexed functions.
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18.3.1 REGISTERS
Each MSSP module has four registers for SPI mode operation. These are: * MSSP Control Register 1 (SSPxCON1) * MSSP Status Register (SSPxSTAT) * Serial Receive/Transmit Buffer Register (SSPxBUF) * MSSP Shift Register (SSPxSR) - Not directly accessible SSPxCON1 and SSPxSTAT are the control and status registers in SPI mode operation. The SSPxCON1 register is readable and writable. The lower 6 bits of the SSPxSTAT are read-only. The upper two bits of the SSPxSTAT are read/write. SSPxSR is the shift register used for shifting data in or out. SSPxBUF is the buffer register to which data bytes are written to or read from. In receive operations, SSPxSR and SSPxBUF together create a double-buffered receiver. When SSPxSR receives a complete byte, it is transferred to SSPxBUF and the SSPxIF interrupt is set. During transmission, the SSPxBUF is not double-buffered. A write to SSPxBUF will write to both SSPxBUF and SSPxSR.
REGISTER 18-1:
SSPxSTAT: MSSPx STATUS REGISTER (SPI MODE)
R/W-0 SMP bit 7 R/W-0 CKE R-0 D/A R-0 P R-0 S R-0 R/W R-0 UA R-0 BF bit 0
bit 7
SMP: Sample bit SPI Master mode: 1 = Input data sampled at end of data output time 0 = Input data sampled at middle of data output time SPI Slave mode: SMP must be cleared when SPI is used in Slave mode. CKE: SPI Clock Select bit 1 = Transmit occurs on transition from active to Idle clock state 0 = Transmit occurs on transition from Idle to active clock state Note: Polarity of clock state is set by the CKP bit (SSPxCON1<4>).
bit 6
bit 5 bit 4
D/A: Data/Address bit Used in I2C mode only. P: Stop bit Used in I2C mode only. This bit is cleared when the MSSP module is disabled, SSPEN is cleared. S: Start bit Used in I2C mode only. R/W: Read/Write Information bit Used in I2C mode only. UA: Update Address bit Used in I2C mode only. BF: Buffer Full Status bit (Receive mode only) 1 = Receive complete, SSPxBUF is full 0 = Receive not complete, SSPxBUF is empty Legend: R = Readable bit -n = Value at POR W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown
bit 3 bit 2 bit 1 bit 0
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REGISTER 18-2: SSPxCON1: MSSPx CONTROL REGISTER 1 (SPI MODE)
R/W-0 WCOL bit 7 bit 7 WCOL: Write Collision Detect bit (Transmit mode only) 1 = The SSPxBUF register is written while it is still transmitting the previous word (must be cleared in software) 0 = No collision SSPOV: Receive Overflow Indicator bit SPI Slave mode: 1 = A new byte is received while the SSPxBUF register is still holding the previous data. In case of overflow, the data in SSPxSR is lost. Overflow can only occur in Slave mode. The user must read the SSPxBUF, even if only transmitting data, to avoid setting overflow (must be cleared in software). 0 = No overflow Note: bit 5 In Master mode, the overflow bit is not set since each new reception (and transmission) is initiated by writing to the SSPxBUF register. R/W-0 SSPOV R/W-0 SSPEN R/W-0 CKP R/W-0 SSPM3 R/W-0 SSPM2 R/W-0 SSPM1 R/W-0 SSPM0 bit 0
bit 6
SSPEN: Synchronous Serial Port Enable bit 1 = Enables serial port and configures SCKx, SDOx, SDIx and SSx as serial port pins 0 = Disables serial port and configures these pins as I/O port pins Note: When enabled, these pins must be properly configured as input or output.
bit 4
CKP: Clock Polarity Select bit 1 = Idle state for clock is a high level 0 = Idle state for clock is a low level SSPM3:SSPM0: Synchronous Serial Port Mode Select bits 0101 = SPI Slave mode, clock = SCKx pin, SSx pin control disabled, SSx can be used as I/O pin 0100 = SPI Slave mode, clock = SCKx pin, SSx pin control enabled 0011 = SPI Master mode, clock = TMR2 output/2 0010 = SPI Master mode, clock = FOSC/64 0001 = SPI Master mode, clock = FOSC/16 0000 = SPI Master mode, clock = FOSC/4 Note: Bit combinations not specifically listed here are either reserved or implemented in I2C mode only.
bit 3-0
Legend: R = Readable bit -n = Value at POR W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown
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18.3.2 OPERATION
When initializing the SPI, several options need to be specified. This is done by programming the appropriate control bits (SSPxCON1<5:0> and SSPxSTAT<7:6>). These control bits allow the following to be specified: * * * * Master mode (SCKx is the clock output) Slave mode (SCKx is the clock input) Clock Polarity (Idle state of SCKx) Data Input Sample Phase (middle or end of data output time) * Clock Edge (output data on rising/falling edge of SCKx) * Clock Rate (Master mode only) * Slave Select mode (Slave mode only) Each MSSP consists of a transmit/receive shift register (SSPxSR) and a buffer register (SSPxBUF). The SSPxSR shifts the data in and out of the device, MSb first. The SSPxBUF holds the data that was written to the SSPxSR until the received data is ready. Once the 8 bits of data have been received, that byte is moved to the SSPxBUF register. Then, the Buffer Full detect bit BF (SSPxSTAT<0>) and the interrupt flag bit SSPxIF are set. This double-buffering of the received data (SSPxBUF) allows the next byte to start reception before reading the data that was just received. Any write to the SSPxBUF register during transmission/reception of data will be ignored and the Write Collision detect bit, WCOL (SSPxCON1<7>), will be set. User software must clear the WCOL bit so that it can be determined if the following write(s) to the SSPxBUF register completed successfully. When the application software is expecting to receive valid data, the SSPxBUF should be read before the next byte of data to transfer is written to the SSPxBUF. The Buffer Full bit, BF (SSPxSTAT<0>), indicates when SSPxBUF has been loaded with the received data (transmission is complete). When the SSPxBUF is read, the BF bit is cleared. This data may be irrelevant if the SPI is only a transmitter. Generally, the MSSP interrupt is used to determine when the transmission/reception has completed. The SSPxBUF must be read and/or written. If the interrupt method is not going to be used, then software polling can be done to ensure that a write collision does not occur. Example 18-1 shows the loading of the SSP1BUF (SSP1SR) for data transmission. The SSPxSR is not directly readable or writable and can only be accessed by addressing the SSPxBUF register. Additionally, the SSPxSTAT register indicates the various status conditions.
EXAMPLE 18-1:
LOOP BTFSS BRA MOVF MOVWF MOVF MOVWF
LOADING THE SSP1BUF (SSP1SR) REGISTER
SSP1STAT, BF LOOP SSP1BUF, W RXDATA TXDATA, W SSP1BUF ;Has data been received (transmit complete)? ;No ;WREG reg = contents of SSP1BUF ;Save in user RAM, if data is meaningful ;W reg = contents of TXDATA ;New data to xmit
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18.3.3 ENABLING SPI I/O
To enable the serial port, SSP Enable bit, SSPEN (SSPxCON1<5>), must be set. To reset or reconfigure SPI mode, clear the SSPEN bit, reinitialize the SSPxCON registers and then set the SSPEN bit. This configures the SDIx, SDOx, SCKx and SSx pins as serial port pins. For the pins to behave as the serial port function, some must have their data direction bits (in the TRIS register) appropriately programmed as follows: * SDIx is automatically controlled by the SPI module * SDOx must have TRISC<5> (or TRISD<4>) bit cleared * SCKx (Master mode) must have TRISC<3> (or TRISD<6>) bit cleared * SCKx (Slave mode) must have TRISC<3> (or TRISD<6>) bit set * SSx must have TRISF<7> (or TRISD<7>) bit set Any serial port function that is not desired may be overridden by programming the corresponding data direction (TRIS) register to the opposite value.
18.3.4
TYPICAL CONNECTION
Figure 18-2 shows a typical connection between two microcontrollers. The master controller (Processor 1) initiates the data transfer by sending the SCKx signal. Data is shifted out of both shift registers on their programmed clock edge and latched on the opposite edge of the clock. Both processors should be programmed to the same Clock Polarity (CKP), then both controllers would send and receive data at the same time. Whether the data is meaningful (or dummy data) depends on the application software. This leads to three scenarios for data transmission: * Master sends data - Slave sends dummy data * Master sends data - Slave sends data * Master sends dummy data - Slave sends data
FIGURE 18-2:
SPITM MASTER/SLAVE CONNECTION
SPITM Master SSPM3:SSPM0 = 00xxb SDOx SDIx
SPITM Slave SSPM3:SSPM0 = 010xb
Serial Input Buffer (SSPxBUF)
Serial Input Buffer (SSPxBUF)
Shift Register (SSPxSR) MSb LSb
SDIx
SDOx
Shift Register (SSPxSR) MSb LSb
SCKx PROCESSOR 1
Serial Clock
SCKx PROCESSOR 2
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18.3.5 MASTER MODE
The master can initiate the data transfer at any time because it controls the SCKx. The master determines when the slave (Processor 2, Figure 18-2) will broadcast data by the software protocol. In Master mode, the data is transmitted/received as soon as the SSPxBUF register is written to. If the SPI is only going to receive, the SDOx output could be disabled (programmed as an input). The SSPxSR register will continue to shift in the signal present on the SDIx pin at the programmed clock rate. As each byte is received, it will be loaded into the SSPxBUF register as if a normal received byte (interrupts and status bits appropriately set). This could be useful in receiver applications as a "Line Activity Monitor" mode. The clock polarity is selected by appropriately programming the CKP bit (SSPxCON1<4>). This then, would give waveforms for SPI communication as shown in Figure 18-3, Figure 18-5 and Figure 18-6, where the MSB is transmitted first. In Master mode, the SPI clock rate (bit rate) is user programmable to be one of the following: * * * * FOSC/4 (or TCY) FOSC/16 (or 4 * TCY) FOSC/64 (or 16 * TCY) Timer2 output/2
This allows a maximum data rate (at 40 MHz) of 10.00 Mbps. Figure 18-3 shows the waveforms for Master mode. When the CKE bit is set, the SDOx data is valid before there is a clock edge on SCKx. The change of the input sample is shown based on the state of the SMP bit. The time when the SSPxBUF is loaded with the received data is shown.
FIGURE 18-3:
Write to SSPxBUF SCKx (CKP = 0 CKE = 0) SCKx (CKP = 1 CKE = 0) SCKx (CKP = 0 CKE = 1) SCKx (CKP = 1 CKE = 1) SDOx (CKE = 0) SDOx (CKE = 1) SDIx (SMP = 0) Input Sample (SMP = 0) SDIx (SMP = 1) Input Sample (SMP = 1) SSPxIF SSPxSR to SSPxBUF
SPITM MODE WAVEFORM (MASTER MODE)
4 Clock Modes
bit 7 bit 7
bit 6 bit 6
bit 5 bit 5
bit 4 bit 4
bit 3 bit 3
bit 2 bit 2
bit 1 bit 1
bit 0 bit 0
bit 7
bit 0
bit 7
bit 0
Next Q4 Cycle after Q2
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18.3.6 SLAVE MODE
In Slave mode, the data is transmitted and received as the external clock pulses appear on SCKx. When the last bit is latched, the SSPxIF interrupt flag bit is set. Before enabling the module in SPI Slave mode, the clock line must match the proper Idle state. The clock line can be observed by reading the SCKx pin. The Idle state is determined by the CKP bit (SSPxCON1<4>). While in Slave mode, the external clock is supplied by the external clock source on the SCKx pin. This external clock must meet the minimum high and low times as specified in the electrical specifications. While in Sleep mode, the slave can transmit/receive data. When a byte is received, the device will wake-up from Sleep. SDOx pin is driven. When the SSx pin goes high, the SDOx pin is no longer driven, even if in the middle of a transmitted byte and becomes a floating output. External pull-up/pull-down resistors may be desirable depending on the application. Note 1: When the SPI is in Slave mode with SSx pin control enabled (SSPxCON1<3:0> = 0100), the SPI module will reset if the SSx pin is set to VDD. 2: If the SPI is used in Slave mode with CKE set, then the SSx pin control must be enabled. When the SPI module resets, the bit counter is forced to `0'. This can be done by either forcing the SSx pin to a high level or clearing the SSPEN bit. To emulate two-wire communication, the SDOx pin can be connected to the SDIx pin. When the SPI needs to operate as a receiver, the SDOx pin can be configured as an input. This disables transmissions from the SDOx. The SDIx can always be left as an input (SDIx function) since it cannot create a bus conflict.
18.3.7
SLAVE SELECT SYNCHRONIZATION
The SSx pin allows a Synchronous Slave mode. The SPI must be in Slave mode with SSx pin control enabled (SSPxCON1<3:0> = 04h). When the SSx pin is low, transmission and reception are enabled and the
FIGURE 18-4:
SLAVE SYNCHRONIZATION WAVEFORM
SSx
SCKx (CKP = 0 CKE = 0) SCKx (CKP = 1 CKE = 0)
Write to SSPxBUF
SDOx
bit 7
bit 6
bit 7
bit 0
SDIx (SMP = 0) Input Sample (SMP = 0) SSPxIF Interrupt Flag SSPxSR to SSPxBUF
bit 0 bit 7 bit 7
Next Q4 Cycle after Q2
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FIGURE 18-5:
SSx Optional SCKx (CKP = 0 CKE = 0) SCKx (CKP = 1 CKE = 0) Write to SSPxBUF SDOx SDIx (SMP = 0) Input Sample (SMP = 0) SSPxIF Interrupt Flag SSPxSR to SSPxBUF bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0
SPITM MODE WAVEFORM (SLAVE MODE WITH CKE = 0)
bit 7
bit 0
Next Q4 Cycle after Q2
FIGURE 18-6:
SSx Not Optional SCKx (CKP = 0 CKE = 1) SCKx (CKP = 1 CKE = 1) Write to SSPxBUF SDOx SDIx (SMP = 0) Input Sample (SMP = 0) SSPxIF Interrupt Flag SSPxSR to SSPxBUF
SPITM MODE WAVEFORM (SLAVE MODE WITH CKE = 1)
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
bit 7
bit 0
Next Q4 Cycle after Q2
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18.3.8 OPERATION IN POWER-MANAGED MODES 18.3.10 BUS MODE COMPATIBILITY
Table 18-1 shows the compatibility between the standard SPI modes and the states of the CKP and CKE control bits.
In SPI Master mode, module clocks may be operating at a different speed than when in full power mode; in the case of Sleep mode, all clocks are halted. In Idle modes, a clock is provided to the peripherals. That clock should be from the primary clock source, the secondary clock (Timer1 oscillator at 32.768 kHz) or the INTOSC source. See Section 2.6 "Clock Sources and Oscillator Switching" for additional information. In most cases, the speed that the master clocks SPI data is not important; however, this should be evaluated for each system. If MSSP interrupts are enabled, they can wake the controller from Sleep mode, or one of the Idle modes, when the master completes sending data. If an exit from Sleep or Idle mode is not desired, MSSP interrupts should be disabled. If the Sleep mode is selected, all module clocks are halted and the transmission/reception will remain in that state until the devices wakes. After the device returns to Run mode, the module will resume transmitting and receiving data. In SPI Slave mode, the SPI Transmit/Receive Shift register operates asynchronously to the device. This allows the device to be placed in any power-managed mode and data to be shifted into the SPI Transmit/Receive Shift register. When all 8 bits have been received, the MSSP interrupt flag bit will be set and if enabled, will wake the device.
TABLE 18-1:
SPITM BUS MODES
Control Bits State CKP 0 0 1 1 CKE 1 0 1 0
Standard SPITM Mode Terminology 0, 0 0, 1 1, 0 1, 1
There is also an SMP bit which controls when the data is sampled.
18.3.11
SPI CLOCK SPEED AND MODULE INTERACTIONS
Because MSSP1 and MSSP2 are independent modules, they can operate simultaneously at different data rates. Setting the SSPM3:SSPM0 bits of the SSPxCON1 register determines the rate for the corresponding module. An exception is when both modules use Timer2 as a time base in Master mode. In this instance, any changes to the Timer2 operation will affect both MSSP modules equally. If different bit rates are required for each module, the user should select one of the other three time base options for one of the modules.
18.3.9
EFFECTS OF A RESET
A Reset disables the MSSP module and terminates the current transfer.
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TABLE 18-2:
Name INTCON PIR1 PIE1 IPR1 PIR3 PIE3 IPR3 TRISC TRISD TRISF SSP1BUF SSP1CON1 SSP1STAT SSP2BUF SSP2CON1 SSP2STAT
REGISTERS ASSOCIATED WITH SPITM OPERATION
Bit 7 Bit 6 Bit 5 Bit 4 INT0IE TX1IF TX1IE TX1IP TX2IF TX2IE TX2IP TRISC4 TRISD4 TRISF4 CKP P CKP P Bit 3 RBIE SSP1IF SSP1IE SSP1IP TMR4IF TMR4IE TMR4IP TRISC3 TRISD3 TRISF3 SSPM3 S SSPM3 S Bit 2 TMR0IF CCP1IF CCP1IE CCP1IP CCP5IF CCP5IE CCP5IP TRISC2 TRISD2 TRISF2 SSPM2 R/W SSPM2 R/W Bit 1 INT0IF TMR2IF TMR2IE TMR2IP CCP4IF CCP4IE CCP4IP TRISC1 TRISD1 TRISF1 SSPM1 UA SSPM1 UA Bit 0 RBIF TMR1IF TMR1IE TMR1IP CCP3IF CCP3IE CCP3IP TRISC0 TRISD0 -- SSPM0 BF SSPM0 BF Reset Values on page 49 51 51 51 51 51 51 52 52 52 50 50 50 53 53 53
GIE/GIEH PEIE/GIEL TMR0IE PSPIF PSPIE PSPIP SSP2IF SSP2IE SSP2IP TRISC7 TRISD7 TRISF7 WCOL SMP WCOL SMP ADIF ADIE ADIP BCL2IF BCL2IE BCL2IP TRISC6 TRISD6 TRISF6 SSPOV CKE SSPOV CKE RC1IF RC1IE RC1IP RC2IF RC2IE RC2IP TRISC5 TRISD5 TRISF5 SSPEN D/A SSPEN D/A
MSSP1 Receive Buffer/Transmit Register
MSSP2 Receive Buffer/Transmit Register
Legend: Shaded cells are not used by the MSSP module in SPITM mode.
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18.4 I2C Mode
18.4.1 REGISTERS
The MSSP module in I 2C mode fully implements all master and slave functions (including general call support) and provides interrupts on Start and Stop bits in hardware to determine a free bus (multi-master function). The MSSP module implements the standard mode specifications as well as 7-bit and 10-bit addressing. Two pins are used for data transfer: * Serial clock (SCLx) - RC3/SCK1/SCL1 or RD6/SCK2/SCL2 * Serial data (SDAx) - RC4/SDI1/SDA1 or RD5/SDI2/SDA2 The user must configure these pins as inputs by setting the TRISC<4:3> or TRISD<5:4> bits. The MSSP module has six registers for I2C operation. These are: * * * * MSSP Control Register 1 (SSPxCON1) MSSP Control Register 2 (SSPxCON2) MSSP Status Register (SSPxSTAT) Serial Receive/Transmit Buffer Register (SSPxBUF) * MSSP Shift Register (SSPxSR) - Not directly accessible * MSSP Address Register (SSPxADD) SSPxCON1, SSPxCON2 and SSPxSTAT are the control and status registers in I2C mode operation. The SSPxCON1 and SSPxCON2 registers are readable and writable. The lower 6 bits of the SSPxSTAT are read-only. The upper two bits of the SSPxSTAT are read/write. SSPxSR is the shift register used for shifting data in or out. SSPxBUF is the buffer register to which data bytes are written to or read from. SSPxADD register holds the slave device address when the SSP is configured in I2C Slave mode. When the SSP is configured in Master mode, the lower seven bits of SSPxADD act as the Baud Rate Generator reload value. In receive operations, SSPxSR and SSPxBUF together create a double-buffered receiver. When SSPxSR receives a complete byte, it is transferred to SSPxBUF and the SSPxIF interrupt is set.
Addr Match
FIGURE 18-7:
MSSP BLOCK DIAGRAM (I2CTM MODE)
Internal Data Bus
Read RC3 or RD6 Shift Clock SSPxSR reg RC4 or RD5 MSb SSPxBUF reg
Write
LSb
Match Detect
During transmission, the SSPxBUF is not double-buffered. A write to SSPxBUF will write to both SSPxBUF and SSPxSR.
SSPxADD reg Start and Stop bit Detect Set, Reset S, P bits (SSPxSTAT reg)
Note: Only port I/O names are used in this diagram for the sake of brevity. Refer to the text for a full list of multiplexed functions.
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REGISTER 18-3: SSPxSTAT: MSSPx STATUS REGISTER (I2C MODE)
R/W-0 SMP bit 7 bit 7 SMP: Slew Rate Control bit In Master or Slave mode: 1 = Slew rate control disabled for Standard Speed mode (100 kHz and 1 MHz) 0 = Slew rate control enabled for High-Speed mode (400 kHz) CKE: SMBus Select bit In Master or Slave mode: 1 = Enable SMBus specific inputs 0 = Disable SMBus specific inputs D/A: Data/Address bit In Master mode: Reserved. In Slave mode: 1 = Indicates that the last byte received or transmitted was data 0 = Indicates that the last byte received or transmitted was address P: Stop bit 1 = Indicates that a Stop bit has been detected last 0 = Stop bit was not detected last Note: bit 3 This bit is cleared on Reset and when SSPEN is cleared. R/W-0 CKE R-0 D/A R-0 P R-0 S R-0 R/W R-0 UA R-0 BF bit 0
bit 6
bit 5
bit 4
S: Start bit 1 = Indicates that a Start bit has been detected last 0 = Start bit was not detected last Note: This bit is cleared on Reset and when SSPEN is cleared. R/W: Read/Write Information bit (I2C mode only) In Slave mode: 1 = Read 0 = Write This bit holds the R/W bit information following the last address match. This bit is only valid from the address match to the next Start bit, Stop bit or not ACK bit. In Master mode: 1 = Transmit is in progress 0 = Transmit is not in progress Note: ORing this bit with SEN, RSEN, PEN, RCEN or ACKEN will indicate if the MSSP is in Active mode. Note:
bit 2
bit 1
UA: Update Address bit (10-bit Slave mode only) 1 = Indicates that the user needs to update the address in the SSPxADD register 0 = Address does not need to be updated BF: Buffer Full Status bit In Transmit mode: 1 = SSPxBUF is full 0 = SSPxBUF is empty In Receive mode: 1 = SSPxBUF is full (does not include the ACK and Stop bits) 0 = SSPxBUF is empty (does not include the ACK and Stop bits) Legend: R = Readable bit -n = Value at POR W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown
bit 0
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REGISTER 18-4: SSPxCON1: MSSPx CONTROL REGISTER 1 (I2C MODE)
R/W-0 WCOL bit 7 bit 7 R/W-0 SSPOV R/W-0 SSPEN R/W-0 CKP R/W-0 SSPM3 R/W-0 SSPM2 R/W-0 SSPM1 R/W-0 SSPM0 bit 0
WCOL: Write Collision Detect bit In Master Transmit mode: 1 = A write to the SSPxBUF register was attempted while the I2C conditions were not valid for a transmission to be started (must be cleared in software) 0 = No collision In Slave Transmit mode: 1 = The SSPxBUF register is written while it is still transmitting the previous word (must be cleared in software) 0 = No collision In Receive mode (Master or Slave modes): This is a "don't care" bit. SSPOV: Receive Overflow Indicator bit In Receive mode: 1 = A byte is received while the SSPxBUF register is still holding the previous byte (must be cleared in software) 0 = No overflow In Transmit mode: This is a "don't care" bit in Transmit mode. SSPEN: Synchronous Serial Port Enable bit 1 = Enables the serial port and configures the SDAx and SCLx pins as the serial port pins 0 = Disables serial port and configures these pins as I/O port pins Note: When enabled, the SDAx and SCLx pins must be properly configured as input or output.
bit 6
bit 5
bit 4
CKP: SCKx Release Control bit In Slave mode: 1 = Release clock 0 = Holds clock low (clock stretch), used to ensure data setup time In Master mode: Unused in this mode. SSPM3:SSPM0: Synchronous Serial Port Mode Select bits 1111 = I2C Slave mode, 10-bit address with Start and Stop bit interrupts enabled 1110 = I2C Slave mode, 7-bit address with Start and Stop bit interrupts enabled 1011 = I2C Firmware Controlled Master mode (Slave Idle) 1000 = I2C Master mode, clock = FOSC/(4 * (SSPxADD + 1)) 0111 = I2C Slave mode, 10-bit address 0110 = I2C Slave mode, 7-bit address Bit combinations not specifically listed here are either reserved or implemented in SPI mode only. Legend: R = Readable bit -n = Value at POR W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown
bit 3-0
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REGISTER 18-5: SSPxCON2: MSSPx CONTROL REGISTER 2 (I2C MODE)
R/W-0 GCEN bit 7 bit 7 GCEN: General Call Enable bit (Slave mode only) 1 = Enable interrupt when a general call address (0000h) is received in the SSPxSR 0 = General call address disabled ACKSTAT: Acknowledge Status bit (Master Transmit mode only) 1 = Acknowledge was not received from slave 0 = Acknowledge was received from slave ACKDT: Acknowledge Data bit (Master Receive mode only) 1 = Not Acknowledge 0 = Acknowledge Note: bit 4 Value that will be transmitted when the user initiates an Acknowledge sequence at the end of a receive. R/W-0 ACKSTAT R/W-0 ACKDT R/W-0 ACKEN(1) R/W-0 RCEN(1) R/W-0 PEN(1) R/W-0 RSEN(1) R/W-0 SEN(1) bit 0
bit 6
bit 5
ACKEN: Acknowledge Sequence Enable bit (Master Receive mode only)(1) 1 = Initiate Acknowledge sequence on SDAx and SCLx pins and transmit ACKDT data bit. Automatically cleared by hardware. 0 = Acknowledge sequence Idle RCEN: Receive Enable bit (Master mode only)(1) 1 = Enables Receive mode for I2C 0 = Receive Idle PEN: Stop Condition Enable bit (Master mode only)(1) 1 = Initiate Stop condition on SDAx and SCLx pins. Automatically cleared by hardware. 0 = Stop condition Idle
bit 3
bit 2
bit 1
RSEN: Repeated Start Condition Enable bit (Master mode only)(1) 1 = Initiate Repeated Start condition on SDAx and SCLx pins. Automatically cleared by hardware. 0 = Repeated Start condition Idle SEN: Start Condition Enable/Stretch Enable bit(1) In Master mode: 1 = Initiate Start condition on SDAx and SCLx pins. Automatically cleared by hardware. 0 = Start condition Idle In Slave mode: 1 = Clock stretching is enabled for both slave transmit and slave receive (stretch enabled) 0 = Clock stretching is disabled Note 1: For bits ACKEN, RCEN, PEN, RSEN, SEN: If the I2C module is not in the Idle mode, these bits may not be set (no spooling) and the SSPxBUF may not be written (or writes to the SSPxBUF are disabled). Legend: R = Readable bit -n = Value at POR W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown
bit 0
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18.4.2 OPERATION 18.4.3.1 Addressing
The MSSP module functions are enabled by setting the MSSP Enable bit, SSPEN (SSPxCON1<5>). The SSPxCON1 register allows control of the operation. Four mode selection (SSPxCON1<3:0>) allow one of the following modes to be selected: * I2C Master mode, clock = (FOSC/4) x (SSPxADD + 1) * I 2C Slave mode (7-bit address) * I 2C Slave mode (10-bit address) * I 2C Slave mode (7-bit address) with Start and Stop bit interrupts enabled * I 2C Slave mode (10-bit address) with Start and Stop bit interrupts enabled * I 2C Firmware Controlled Master mode, slave is Idle Selection of any I 2C mode, with the SSPEN bit set, forces the SCLx and SDAx pins to be open-drain, provided these pins are programmed to inputs by setting the appropriate TRISC or TRISD bits. To ensure proper operation of the module, pull-up resistors must be provided externally to the SCLx and SDAx pins. I 2C bits I 2C Once the MSSP module has been enabled, it waits for a Start condition to occur. Following the Start condition, the 8 bits are shifted into the SSPxSR register. All incoming bits are sampled with the rising edge of the clock (SCLx) line. The value of register SSPxSR<7:1> is compared to the value of the SSPxADD register. The address is compared on the falling edge of the eighth clock (SCLx) pulse. If the addresses match and the BF and SSPOV bits are clear, the following events occur: 1. 2. 3. 4. The SSPxSR register value is loaded into the SSPxBUF register. The Buffer Full bit, BF, is set. An ACK pulse is generated. The MSSP Interrupt Flag bit, SSPxIF, is set (and interrupt is generated, if enabled) on the falling edge of the ninth SCLx pulse.
18.4.3
SLAVE MODE
In 10-bit Address mode, two address bytes need to be received by the slave. The five Most Significant bits (MSbs) of the first address byte specify if this is a 10-bit address. Bit R/W (SSPxSTAT<2>) must specify a write so the slave device will receive the second address byte. For a 10-bit address, the first byte would equal `11110 A9 A8 0', where `A9' and `A8' are the two MSbs of the address. The sequence of events for 10-bit address is as follows, with steps 7 through 9 for the slave-transmitter: 1. 2. Receive first (high) byte of address (bits SSPxIF, BF and UA (SSPxSTAT<1>) are set). Update the SSPxADD register with second (low) byte of address (clears bit UA and releases the SCLx line). Read the SSPxBUF register (clears bit BF) and clear flag bit SSPxIF. Receive second (low) byte of address (bits SSPxIF, BF and UA are set). Update the SSPxADD register with the first (high) byte of address. If match releases SCLx line, this will clear bit UA. Read the SSPxBUF register (clears bit BF) and clear flag bit SSPxIF. Receive Repeated Start condition. Receive first (high) byte of address (bits SSPxIF and BF are set). Read the SSPxBUF register (clears bit BF) and clear flag bit SSPxIF.
In Slave mode, the SCLx and SDAx pins must be configured as inputs (TRISC<4:3> or TRISD<5:4> set). The MSSP module will override the input state with the output data when required (slave-transmitter). The I 2C Slave mode hardware will always generate an interrupt on an address match. Through the mode select bits, the user can also choose to interrupt on Start and Stop bits When an address is matched, or the data transfer after an address match is received, the hardware automatically will generate the Acknowledge (ACK) pulse and load the SSPxBUF register with the received value currently in the SSPxSR register. Any combination of the following conditions will cause the MSSP module not to give this ACK pulse: * The Buffer Full bit, BF (SSPxSTAT<0>), was set before the transfer was received. * The overflow bit, SSPOV (SSPxCON1<6>), was set before the transfer was received. In this case, the SSPxSR register value is not loaded into the SSPxBUF, but bit SSPxIF is set. The BF bit is cleared by reading the SSPxBUF register, while bit SSPOV is cleared through software. The SCLx clock input must have a minimum high and low for proper operation. The high and low times of the I2C specification, as well as the requirement of the MSSP module, are shown in timing parameter 100 and parameter 101.
3. 4. 5.
6. 7. 8. 9.
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18.4.3.2 Reception 18.4.3.3 Transmission
When the R/W bit of the address byte is clear and an address match occurs, the R/W bit of the SSPxSTAT register is cleared. The received address is loaded into the SSPxBUF register and the SDAx line is held low (ACK). When the address byte overflow condition exists, then the no Acknowledge (ACK) pulse is given. An overflow condition is defined as either bit BF (SSPxSTAT<0>) is set, or bit SSPOV (SSPxCON1<6>) is set. An MSSP interrupt is generated for each data transfer byte. The interrupt flag bit, SSPxIF, must be cleared in software. The SSPxSTAT register is used to determine the status of the byte. If SEN is enabled (SSPxCON2<0> = 1), SCKx/SCLx (RC3 or RD6) will be held low (clock stretch) following each data transfer. The clock must be released by setting bit, CKP (SSPxCON1<4>). See Section 18.4.4 "Clock Stretching" for more details. When the R/W bit of the incoming address byte is set and an address match occurs, the R/W bit of the SSPxSTAT register is set. The received address is loaded into the SSPxBUF register. The ACK pulse will be sent on the ninth bit and pin RC3 or RD6 is held low, regardless of SEN (see Section 18.4.4 "Clock Stretching" for more details). By stretching the clock, the master will be unable to assert another clock pulse until the slave is done preparing the transmit data. The transmit data must be loaded into the SSPxBUF register which also loads the SSPxSR register. Then pin RC3 or RD6 should be enabled by setting bit, CKP (SSPxCON1<4>). The eight data bits are shifted out on the falling edge of the SCLx input. This ensures that the SDAx signal is valid during the SCLx high time (Figure 18-9). The ACK pulse from the master-receiver is latched on the rising edge of the ninth SCLx input pulse. If the SDAx line is high (not ACK), then the data transfer is complete. In this case, when the ACK is latched by the slave, the slave logic is reset (resets SSPxSTAT register) and the slave monitors for another occurrence of the Start bit. If the SDAx line was low (ACK), the next transmit data must be loaded into the SSPxBUF register. Again, pin RC3 or RD6 must be enabled by setting bit CKP. An MSSP interrupt is generated for each data transfer byte. The SSPxIF bit must be cleared in software and the SSPxSTAT register is used to determine the status of the byte. The SSPxIF bit is set on the falling edge of the ninth clock pulse.
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FIGURE 18-8:
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Receiving Address A5 A4 A3 A2 A1 ACK D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 R/W = 0 Receiving Data ACK Receiving Data D2 D1 D0 ACK 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 P Bus master terminates transfer Cleared in software SSPxBUF is read SSPOV is set because SSPxBUF is still full. ACK is not sent.
SDAx
A7
A6
SCLx
S
1
2
SSPxIF (PIR1<3> or PIR3<7>)
I2CTM SLAVE MODE TIMING WITH SEN = 0 (RECEPTION, 7-BIT ADDRESS)
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BF (SSPxSTAT<0>)
SSPOV (SSPxCON1<6>)
CKP
(CKP does not reset to `0' when SEN = 0)
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FIGURE 18-9:
DS39663A-page 200
R/W = 0 ACK D1 D0 D4 D3 D2 D5 D7 D6 D1 Transmitting Data D0 A1 D3 D2 ACK D5 D4 D7 D6 Transmitting Data ACK A4 A2 A3 4 SCLx held low while CPU responds to SSPxIF 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 P Cleared in software From SSPxIF ISR SSPxBUF is written in software SSPxBUF is written in software Cleared in software From SSPxIF ISR
Receiving Address
SDAx
A7
A6
A5
SCLx
1
2
3
S
Data in sampled
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SSPxIF (PIR1<3> or PIR3<7>)
I2CTM SLAVE MODE TIMING (TRANSMISSION, 7-BIT ADDRESS)
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CKP is set in software
BF (SSPxSTAT<0>)
CKP
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CKP is set in software
FIGURE 18-10:
Clock is held low until update of SSPxADD has taken place R/W = 0 A8 ACK A7 A6 A5 A4 A3 A2 A1 D7 D6 D5 D4 D3 D2 D1 D0 ACK D7 D6 D5 D4 A0 ACK D3 D2 Receive Second Byte of Address Receive Data Byte Receive Data Byte D1 D0
Clock is held low until update of SSPxADD has taken place ACK
Receive First Byte of Address 0 A9
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5 1 2 3 6 7 8 9 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 4 5 6 7 8 9 P Bus master terminates transfer Cleared in software Cleared in software Cleared in software Dummy read of SSPxBUF to clear BF flag SSPOV is set because SSPxBUF is still full. ACK is not sent. Cleared by hardware when SSPxADD is updated with low byte of address UA is set indicating that SSPxADD needs to be updated Cleared by hardware when SSPxADD is updated with high byte of address
SDAx
1
1
1
1
SCLx
S
1
2
3
4
SSPxIF (PIR1<3> or PIR3<7>)
Cleared in software
BF (SSPxSTAT<0>)
SSPxBUF is written with contents of SSPxSR
SSPOV (SSPxCON1<6>)
I2CTM SLAVE MODE TIMING WITH SEN = 0 (RECEPTION, 10-BIT ADDRESS)
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UA (SSPxSTAT<1>)
UA is set indicating that the SSPxADD needs to be updated
CKP
(CKP does not reset to `0' when SEN = 0)
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FIGURE 18-11:
DS39663A-page 202
Clock is held low until update of SSPxADD has taken place Clock is held low until CKP is set to `1' R/W = 1 ACK D7 D6 D5 Transmitting Data Byte D4 D3 D2 D1 D0 ACK R/W = 0 Receive Second Byte of Address Receive First Byte of Address ACK 1 1 1 1 0 A9 A8 ACK A7 A6 A5 A4 A3 A2 A1 A0 1 0 A9 A8 Clock is held low until update of SSPxADD has taken place Bus master terminates transfer 4 6 Sr 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1 2 3 4 5 7 8 9 1 2 3 4 5 6 7 8 9 P Cleared in software Cleared in software Cleared in software Dummy read of SSPxBUF to clear BF flag Dummy read of SSPxBUF to clear BF flag Write of SSPxBUF BF flag is clear initiates transmit at the end of the third address sequence Completion of data transmission clears BF flag Cleared by hardware when SSPxADD is updated with low byte of address UA is set indicating that SSPxADD needs to be updated Cleared by hardware when SSPxADD is updated with high byte of address. CKP is set in software CKP is automatically cleared in hardware, holding SCLx low
Receive First Byte of Address
SDAx
1
1
1
SCLx
S
1
2
3
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SSPxIF (PIR1<3> or PIR3<7>)
BF (SSPxSTAT<0>)
SSPxBUF is written with contents of SSPxSR
I2CTM SLAVE MODE TIMING (TRANSMISSION, 10-BIT ADDRESS)
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UA (SSPxSTAT<1>)
UA is set indicating that the SSPxADD needs to be updated
CKP (SSPxCON1<4>)
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18.4.4 CLOCK STRETCHING 18.4.4.3
Both 7-bit and 10-bit Slave modes implement automatic clock stretching during a transmit sequence. The SEN bit (SSPxCON2<0>) allows clock stretching to be enabled during receives. Setting SEN will cause the SCLx pin to be held low at the end of each data receive sequence.
Clock Stretching for 7-bit Slave Transmit Mode
The 7-bit Slave Transmit mode implements clock stretching by clearing the CKP bit after the falling edge of the ninth clock, if the BF bit is clear. This occurs regardless of the state of the SEN bit. The user's ISR must set the CKP bit before transmission is allowed to continue. By holding the SCLx line low, the user has time to service the ISR and load the contents of the SSPxBUF before the master device can initiate another transmit sequence (see Figure 18-9). Note 1: If the user loads the contents of SSPxBUF, setting the BF bit before the falling edge of the ninth clock, the CKP bit will not be cleared and clock stretching will not occur. 2: The CKP bit can be set in software regardless of the state of the BF bit.
18.4.4.1
Clock Stretching for 7-bit Slave Receive Mode (SEN = 1)
In 7-bit Slave Receive mode, on the falling edge of the ninth clock at the end of the ACK sequence, if the BF bit is set, the CKP bit in the SSPxCON1 register is automatically cleared, forcing the SCLx output to be held low. The CKP being cleared to `0' will assert the SCLx line low. The CKP bit must be set in the user's ISR before reception is allowed to continue. By holding the SCLx line low, the user has time to service the ISR and read the contents of the SSPxBUF before the master device can initiate another receive sequence. This will prevent buffer overruns from occurring (see Figure 18-13). Note 1: If the user reads the contents of the SSPxBUF before the falling edge of the ninth clock, thus clearing the BF bit, the CKP bit will not be cleared and clock stretching will not occur. 2: The CKP bit can be set in software regardless of the state of the BF bit. The user should be careful to clear the BF bit in the ISR before the next receive sequence in order to prevent an overflow condition.
18.4.4.4
Clock Stretching for 10-bit Slave Transmit Mode
In 10-bit Slave Transmit mode, clock stretching is controlled during the first two address sequences by the state of the UA bit, just as it is in 10-bit Slave Receive mode. The first two addresses are followed by a third address sequence which contains the high-order bits of the 10-bit address and the R/W bit set to `1'. After the third address sequence is performed, the UA bit is not set, the module is now configured in Transmit mode and clock stretching is controlled by the BF flag as in 7-bit Slave Transmit mode (see Figure 18-11).
18.4.4.2
Clock Stretching for 10-bit Slave Receive Mode (SEN = 1)
In 10-bit Slave Receive mode during the address sequence, clock stretching automatically takes place but CKP is not cleared. During this time, if the UA bit is set after the ninth clock, clock stretching is initiated. The UA bit is set after receiving the upper byte of the 10-bit address and following the receive of the second byte of the 10-bit address with the R/W bit cleared to `0'. The release of the clock line occurs upon updating SSPxADD. Clock stretching will occur on each data receive sequence as described in 7-bit mode. Note: If the user polls the UA bit and clears it by updating the SSPxADD register before the falling edge of the ninth clock occurs and if the user hasn't cleared the BF bit by reading the SSPxBUF register before that time, then the CKP bit will still NOT be asserted low. Clock stretching on the basis of the state of the BF bit only occurs during a data sequence, not an address sequence.
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18.4.4.5 Clock Synchronization and the CKP bit
When the CKP bit is cleared, the SCLx output is forced to `0'. However, clearing the CKP bit will not assert the SCLx output low until the SCLx output is already sampled low. Therefore, the CKP bit will not assert the SCLx line until an external I2C master device has already asserted the SCLx line. The SCLx output will remain low until the CKP bit is set and all other devices on the I2C bus have deasserted SCLx. This ensures that a write to the CKP bit will not violate the minimum high time requirement for SCLx (see Figure 18-12).
FIGURE 18-12:
CLOCK SYNCHRONIZATION TIMING
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
SDAx
DX
DX - 1
SCLx
CKP
Master device asserts clock Master device deasserts clock
WR SSPxCON
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FIGURE 18-13:
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Clock is not held low because buffer full bit is clear prior to falling edge of 9th clock Clock is held low until CKP is set to `1' ACK D2 D1 D0 D7 D6 D5 D4 Receiving Data D3 D2 D1 D0 Receiving Address A5 A4 A3 A2 A1 ACK D7 D6 D5 D4 D3 R/W = 0 Receiving Data Clock is not held low because ACK = 1 ACK 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 P Bus master terminates transfer Cleared in software SSPxBUF is read SSPOV is set because SSPxBUF is still full. ACK is not sent. If BF is cleared prior to the falling edge of the 9th clock, CKP will not be reset to `0' and no clock stretching will occur BF is set after falling edge of the 9th clock, CKP is reset to `0' and clock stretching occurs CKP written to `1' in software
SDAx
A7
A6
SCLx
S
1
2
SSPxIF (PIR1<3> or PIR3<7>)
I2CTM SLAVE MODE TIMING WITH SEN = 1 (RECEPTION, 7-BIT ADDRESS)
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BF (SSPxSTAT<0>)
SSPOV (SSPxCON1<6>)
CKP
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FIGURE 18-14:
DS39663A-page 206
Clock is held low until update of SSPxADD has taken place Clock is held low until CKP is set to `1' Receive Data Byte D1 D0 D7 D6 D5 D4 D3 D2 ACK D1 D0 R/W = 0 ACK A7 A6 A5 A4 A3 A2 A1 A0 ACK D7 D6 D5 D4 D3 D2 Receive Second Byte of Address Receive Data Byte ACK Clock is held low until update of SSPxADD has taken place Clock is not held low because ACK = 1 A9 A8 6 1 2 3 4 7 8 9 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 5 6 7 8 9 P Cleared in software Cleared in software Cleared in software Bus master terminates transfer Dummy read of SSPxBUF to clear BF flag Dummy read of SSPxBUF to clear BF flag SSPOV is set because SSPxBUF is still full. ACK is not sent. Cleared by hardware when SSPxADD is updated with low byte of address after falling edge of ninth clock UA is set indicating that SSPxADD needs to be updated Cleared by hardware when SSPxADD is updated with high byte of address after falling edge of ninth clock Note: An update of the SSPxADD register before the falling edge of the ninth clock will have no effect on UA and UA will remain set. CKP written to `1' in software
Receive First Byte of Address
SDAx
1
1
1
1
0
SCLx
S
1
2
3
4
5
SSPxIF (PIR1<3> or PIR3<7>)
Cleared in software
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BF (SSPxSTAT<0>)
SSPxBUF is written with contents of SSPxSR
SSPOV (SSPxCON1<6>)
I2CTM SLAVE MODE TIMING WITH SEN = 1 (RECEPTION, 10-BIT ADDRESS)
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Note: An update of the SSPxADD register before the falling edge of the ninth clock will have no effect on UA and UA will remain set.
UA (SSPxSTAT<1>)
UA is set indicating that the SSPxADD needs to be updated
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CKP
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18.4.5 GENERAL CALL ADDRESS SUPPORT
The addressing procedure for the I2C bus is such that the first byte after the Start condition usually determines which device will be the slave addressed by the master. The exception is the general call address which can address all devices. When this address is used, all devices should, in theory, respond with an Acknowledge. The general call address is one of eight addresses reserved for specific purposes by the I2C protocol. It consists of all `0's with R/W = 0. The general call address is recognized when the General Call Enable bit, GCEN, is enabled (SSPxCON2<7> set). Following a Start bit detect, 8 bits are shifted into the SSPxSR and the address is compared against the SSPxADD. It is also compared to the general call address and fixed in hardware. If the general call address matches, the SSPxSR is transferred to the SSPxBUF, the BF flag bit is set (eighth bit) and on the falling edge of the ninth bit (ACK bit), the SSPxIF interrupt flag bit is set. When the interrupt is serviced, the source for the interrupt can be checked by reading the contents of the SSPxBUF. The value can be used to determine if the address was device specific or a general call address. In 10-bit mode, the SSPxADD is required to be updated for the second half of the address to match and the UA bit is set (SSPxSTAT<1>). If the general call address is sampled when the GCEN bit is set, while the slave is configured in 10-bit Address mode, then the second half of the address is not necessary, the UA bit will not be set and the slave will begin receiving data after the Acknowledge (Figure 18-15).
FIGURE 18-15:
SLAVE MODE GENERAL CALL ADDRESS SEQUENCE (7 OR 10-BIT ADDRESS MODE)
Address is compared to General Call Address after ACK, set interrupt R/W = 0 Receiving Data D6 D5 D4 D3 D2 D1 D0 ACK
SDAx SCLx S SSPxIF BF (SSPxSTAT<0>) 1
General Call Address
ACK D7
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
Cleared in software SSPxBUF is read SSPOV (SSPxCON1<6>) GCEN (SSPxCON2<7>) `1' `0'
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18.4.6 MASTER MODE
Note: Master mode is enabled by setting and clearing the appropriate SSPM bits in SSPxCON1 and by setting the SSPEN bit. In Master mode, the SCLx and SDAx lines are manipulated by the MSSP hardware. Master mode of operation is supported by interrupt generation on the detection of the Start and Stop conditions. The Stop (P) and Start (S) bits are cleared from a Reset or when the MSSP module is disabled. Control of the I 2C bus may be taken when the P bit is set, or the bus is Idle, with both the S and P bits clear. In Firmware Controlled Master mode, user code conducts all I 2C bus operations based on Start and Stop bit conditions. Once Master mode is enabled, the user has six options. 1. 2. 3. 4. 5. 6. Assert a Start condition on SDAx and SCLx. Assert a Repeated Start condition on SDAx and SCLx. Write to the SSPxBUF register initiating transmission of data/address. Configure the I2C port to receive data. Generate an Acknowledge condition at the end of a received byte of data. Generate a Stop condition on SDAx and SCLx. The MSSP module, when configured in I2C Master mode, does not allow queueing of events. For instance, the user is not allowed to initiate a Start condition and immediately write the SSPxBUF register to initiate transmission before the Start condition is complete. In this case, the SSPxBUF will not be written to and the WCOL bit will be set, indicating that a write to the SSPxBUF did not occur.
The following events will cause the SSP Interrupt Flag bit, SSPxIF, to be set (and SSP interrupt, if enabled): * * * * * Start condition Stop condition Data transfer byte transmitted/received Acknowledge transmit Repeated Start
FIGURE 18-16:
MSSP BLOCK DIAGRAM (I2CTM MASTER MODE)
Internal Data Bus Read SSPxBUF Write Baud Rate Generator Clock Arbitrate/WCOL Detect (hold off clock source) 2005 Microchip Technology Inc. Shift Clock SSPxSR Receive Enable MSb LSb SSPM3:SSPM0 SSPxADD<6:0>
SDAx SDAx In
SCLx
SCLx In Bus Collision
Start bit Detect Stop bit Detect Write Collision Detect Clock Arbitration State Counter for End of XMIT/RCV
Set/Reset S, P, WCOL (SSPxSTAT, SSPxCON1) Set SSPxIF, BCLxIF Reset ACKSTAT, PEN (SSPxCON2)
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Clock Cntl
Start bit, Stop bit, Acknowledge Generate
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18.4.6.1 I2C Master Mode Operation
A typical transmit sequence would go as follows: The user generates a Start condition by setting the Start Enable bit, SEN (SSPxCON2<0>). 2. SSPxIF is set. The MSSP module will wait the required start time before any other operation takes place. 3. The user loads the SSPxBUF with the slave address to transmit. 4. Address is shifted out the SDAx pin until all 8 bits are transmitted. 5. The MSSP module shifts in the ACK bit from the slave device and writes its value into the SSPxCON2 register (SSPxCON2<6>). 6. The MSSP module generates an interrupt at the end of the ninth clock cycle by setting the SSPxIF bit. 7. The user loads the SSPxBUF with eight bits of data. 8. Data is shifted out the SDAx pin until all 8 bits are transmitted. 9. The MSSP module shifts in the ACK bit from the slave device and writes its value into the SSPxCON2 register (SSPxCON2<6>). 10. The MSSP module generates an interrupt at the end of the ninth clock cycle by setting the SSPxIF bit. 11. The user generates a Stop condition by setting the Stop Enable bit, PEN (SSPxCON2<2>). 12. Interrupt is generated once the Stop condition is complete. 1. The master device generates all of the serial clock pulses and the Start and Stop conditions. A transfer is ended with a Stop condition or with a Repeated Start condition. Since the Repeated Start condition is also the beginning of the next serial transfer, the I2C bus will not be released. In Master Transmitter mode, serial data is output through SDAx, while SCLx outputs the serial clock. The first byte transmitted contains the slave address of the receiving device (7 bits) and the Read/Write (R/W) bit. In this case, the R/W bit will be logic `0'. Serial data is transmitted 8 bits at a time. After each byte is transmitted, an Acknowledge bit is received. Start and Stop conditions are output to indicate the beginning and the end of a serial transfer. In Master Receive mode, the first byte transmitted contains the slave address of the transmitting device (7 bits) and the R/W bit. In this case, the R/W bit will be logic `1'. Thus, the first byte transmitted is a 7-bit slave address followed by a `1' to indicate the receive bit. Serial data is received via SDAx, while SCLx outputs the serial clock. Serial data is received 8 bits at a time. After each byte is received, an Acknowledge bit is transmitted. Start and Stop conditions indicate the beginning and end of transmission. The Baud Rate Generator used for the SPI mode operation is used to set the SCLx clock frequency for either 100 kHz, 400 kHz or 1 MHz I2C operation. See Section 18.4.7 "Baud Rate" for more detail.
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18.4.7
2
BAUD RATE
In I C Master mode, the Baud Rate Generator (BRG) reload value is placed in the lower 7 bits of the SSPxADD register (Figure 18-17). When a write occurs to SSPxBUF, the Baud Rate Generator will automatically begin counting. The BRG counts down to `0' and stops until another reload has taken place. The BRG count is decremented twice per instruction cycle (TCY) on the Q2 and Q4 clocks. In I2C Master mode, the BRG is reloaded automatically. Once the given operation is complete (i.e., transmission of the last data bit is followed by ACK), the internal clock will automatically stop counting and the SCLx pin will remain in its last state.
Table 18-3 demonstrates clock rates based on instruction cycles and the BRG value loaded into SSPxADD.
18.4.7.1
Baud Rate and Module Interdependence
Because MSSP1 and MSSP2 are independent, they can operate simultaneously in I2C Master mode at different baud rates. This is done by using different BRG reload values for each module. Because this mode derives its basic clock source from the system clock, any changes to the clock will affect both modules in the same proportion. It may be possible to change one or both baud rates back to a previous value by changing the BRG reload value.
FIGURE 18-17:
BAUD RATE GENERATOR BLOCK DIAGRAM
SSPM3:SSPM0 SSPxADD<6:0>
SSPM3:SSPM0 SCLx
Reload Control CLKO
Reload
BRG Down Counter
FOSC/4
TABLE 18-3:
FCY
I2CTM CLOCK RATE w/BRG
FCY * 2 20 MHz 20 MHz 20 MHz 8 MHz 8 MHz 8 MHz 2 MHz 2 MHz 2 MHz BRG Value 18h 1Fh 63h 09h 0Ch 27h 02h 09h 00h FSCL (2 Rollovers of BRG) 400 kHz(1) 312.5 kHz 100 kHz 400 kHz(1) 308 kHz 100 kHz 333 kHz(1) 100 kHz 1 MHz(1)
10 MHz 10 MHz 10 MHz 4 MHz 4 MHz 4 MHz 1 MHz 1 MHz 1 MHz Note 1:
The I2CTM interface does not conform to the 400 kHz I2C specification (which applies to rates greater than 100 kHz) in all details, but may be used with care where higher rates are required by the application.
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18.4.7.2 Clock Arbitration
Clock arbitration occurs when the master, during any receive, transmit or Repeated Start/Stop condition, deasserts the SCLx pin (SCLx allowed to float high). When the SCLx pin is allowed to float high, the Baud Rate Generator (BRG) is suspended from counting until the SCLx pin is actually sampled high. When the SCLx pin is sampled high, the Baud Rate Generator is reloaded with the contents of SSPxADD<6:0> and begins counting. This ensures that the SCLx high time will always be at least one BRG rollover count in the event that the clock is held low by an external device (Figure 18-18).
FIGURE 18-18:
SDAx
BAUD RATE GENERATOR TIMING WITH CLOCK ARBITRATION
DX SCLx deasserted but slave holds SCLx low (clock arbitration) DX - 1 SCLx allowed to transition high
SCLx BRG decrements on Q2 and Q4 cycles BRG Value 03h 02h 01h 00h (hold off) 03h 02h
SCLx is sampled high, reload takes place and BRG starts its count BRG Reload
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18.4.8 I2C MASTER MODE START CONDITION TIMING
Note: To initiate a Start condition, the user sets the Start Enable bit, SEN (SSPxCON2<0>). If the SDAx and SCLx pins are sampled high, the Baud Rate Generator is reloaded with the contents of SSPxADD<6:0> and starts its count. If SCLx and SDAx are both sampled high when the Baud Rate Generator times out (TBRG), the SDAx pin is driven low. The action of the SDAx being driven low while SCLx is high is the Start condition and causes the S bit (SSPxSTAT<3>) to be set. Following this, the Baud Rate Generator is reloaded with the contents of SSPxADD<6:0> and resumes its count. When the Baud Rate Generator times out (TBRG), the SEN bit (SSPxCON2<0>) will be automatically cleared by hardware. The Baud Rate Generator is suspended, leaving the SDAx line held low and the Start condition is complete. If at the beginning of the Start condition, the SDAx and SCLx pins are already sampled low, or if during the Start condition, the SCLx line is sampled low before the SDAx line is driven low, a bus collision occurs. The Bus Collision Interrupt Flag, BCLxIF, is set, the Start condition is aborted and the I2C module is reset into its Idle state.
18.4.8.1
WCOL Status Flag
If the user writes the SSPxBUF when a Start sequence is in progress, the WCOL is set and the contents of the buffer are unchanged (the write doesn't occur). Note: Because queueing of events is not allowed, writing to the lower 5 bits of SSPxCON2 is disabled until the Start condition is complete.
FIGURE 18-19:
FIRST START BIT TIMING
Set S bit (SSPxSTAT<3>) SDAx = 1, SCLx = 1 At completion of Start bit, hardware clears SEN bit and sets SSPxIF bit TBRG Write to SSPxBUF occurs here 1st bit SDAx TBRG 2nd bit
Write to SEN bit occurs here
TBRG
SCLx S
TBRG
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18.4.9 I2C MASTER MODE REPEATED START CONDITION TIMING
Note 1: If RSEN is programmed while any other event is in progress, it will not take effect. 2: A bus collision during the Repeated Start condition occurs if: * SDAx is sampled low when SCLx goes from low-to-high. * SCLx goes low before SDAx is asserted low. This may indicate that another master is attempting to transmit a data `1'. Immediately following the SSPxIF bit getting set, the user may write the SSPxBUF with the 7-bit address in 7-bit mode or the default first address in 10-bit mode. After the first eight bits are transmitted and an ACK is received, the user may then transmit an additional eight bits of address (10-bit mode) or eight bits of data (7-bit mode). A Repeated Start condition occurs when the RSEN bit (SSPxCON2<1>) is programmed high and the I2C logic module is in the Idle state. When the RSEN bit is set, the SCLx pin is asserted low. When the SCLx pin is sampled low, the Baud Rate Generator is loaded with the contents of SSPxADD<6:0> and begins counting. The SDAx pin is released (brought high) for one Baud Rate Generator count (TBRG). When the Baud Rate Generator times out, if SDAx is sampled high, the SCLx pin will be deasserted (brought high). When SCLx is sampled high, the Baud Rate Generator is reloaded with the contents of SSPxADD<6:0> and begins counting. SDAx and SCLx must be sampled high for one TBRG. This action is then followed by assertion of the SDAx pin (SDAx = 0) for one TBRG while SCLx is high. Following this, the RSEN bit (SSPxCON2<1>) will be automatically cleared and the Baud Rate Generator will not be reloaded, leaving the SDAx pin held low. As soon as a Start condition is detected on the SDAx and SCLx pins, the S bit (SSPxSTAT<3>) will be set. The SSPxIF bit will not be set until the Baud Rate Generator has timed out.
18.4.9.1
WCOL Status Flag
If the user writes the SSPxBUF when a Repeated Start sequence is in progress, the WCOL is set and the contents of the buffer are unchanged (the write doesn't occur). Note: Because queueing of events is not allowed, writing of the lower 5 bits of SSPxCON2 is disabled until the Repeated Start condition is complete.
FIGURE 18-20:
REPEATED START CONDITION WAVEFORM
S bit set by hardware
Write to SSPxCON2 occurs here: SDAx = 1, SCLx (no change)
SDAx = 1, SCLx = 1
At completion of Start bit, hardware clears RSEN bit and sets SSPxIF
TBRG
TBRG
TBRG
SDAx RSEN bit set by hardware on falling edge of ninth clock, end of Xmit SCLx
TBRG
1st bit
Write to SSPxBUF occurs here
TBRG
Sr = Repeated Start
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18.4.10 I2C MASTER MODE TRANSMISSION
Transmission of a data byte, a 7-bit address or the other half of a 10-bit address is accomplished by simply writing a value to the SSPxBUF register. This action will set the Buffer Full flag bit, BF and allow the Baud Rate Generator to begin counting and start the next transmission. Each bit of address/data will be shifted out onto the SDAx pin after the falling edge of SCLx is asserted (see data hold time specification parameter 106). SCLx is held low for one Baud Rate Generator rollover count (TBRG). Data should be valid before SCLx is released high (see data setup time specification parameter 107). When the SCLx pin is released high, it is held that way for TBRG. The data on the SDAx pin must remain stable for that duration and some hold time after the next falling edge of SCLx. After the eighth bit is shifted out (the falling edge of the eighth clock), the BF flag is cleared and the master releases SDAx. This allows the slave device being addressed to respond with an ACK bit during the ninth bit time if an address match occurred, or if data was received properly. The status of ACK is written into the ACKDT bit on the falling edge of the ninth clock. If the master receives an Acknowledge, the Acknowledge Status bit, ACKSTAT, is cleared; if not, the bit is set. After the ninth clock, the SSPxIF bit is set and the master clock (Baud Rate Generator) is suspended until the next data byte is loaded into the SSPxBUF, leaving SCLx low and SDAx unchanged (Figure 18-21). After the write to the SSPxBUF, each bit of the address will be shifted out on the falling edge of SCLx until all seven address bits and the R/W bit are completed. On the falling edge of the eighth clock, the master will deassert the SDAx pin, allowing the slave to respond with an Acknowledge. On the falling edge of the ninth clock, the master will sample the SDAx pin to see if the address was recognized by a slave. The status of the ACK bit is loaded into the ACKSTAT status bit (SSPxCON2<6>). Following the falling edge of the ninth clock transmission of the address, the SSPxIF is set, the BF flag is cleared and the Baud Rate Generator is turned off until another write to the SSPxBUF takes place, holding SCLx low and allowing SDAx to float. The user should verify that the WCOL is clear after each write to SSPBUF to ensure the transfer is correct. In all cases, WCOL must be cleared in software.
18.4.10.3
ACKSTAT Status Flag
In Transmit mode, the ACKSTAT bit (SSPxCON2<6>) is cleared when the slave has sent an Acknowledge (ACK = 0) and is set when the slave does not Acknowledge (ACK = 1). A slave sends an Acknowledge when it has recognized its address (including a general call), or when the slave has properly received its data.
18.4.11
I2C MASTER MODE RECEPTION
Master mode reception is enabled by programming the Receive Enable bit, RCEN (SSPxCON2<3>). Note: The MSSP module must be in an Idle state before the RCEN bit is set or the RCEN bit will be disregarded.
The Baud Rate Generator begins counting and on each rollover, the state of the SCLx pin changes (high-to-low/low-to-high) and data is shifted into the SSPxSR. After the falling edge of the eighth clock, the receive enable flag is automatically cleared, the contents of the SSPxSR are loaded into the SSPxBUF, the BF flag bit is set, the SSPxIF flag bit is set and the Baud Rate Generator is suspended from counting, holding SCLx low. The MSSP is now in Idle state awaiting the next command. When the buffer is read by the CPU, the BF flag bit is automatically cleared. The user can then send an Acknowledge bit at the end of reception by setting the Acknowledge Sequence Enable bit, ACKEN (SSPxCON2<4>).
18.4.11.1
BF Status Flag
In receive operation, the BF bit is set when an address or data byte is loaded into SSPxBUF from SSPxSR. It is cleared when the SSPxBUF register is read.
18.4.11.2
SSPOV Status Flag
In receive operation, the SSPOV bit is set when 8 bits are received into the SSPxSR and the BF flag bit is already set from a previous reception.
18.4.11.3 18.4.10.1 BF Status Flag
In Transmit mode, the BF bit (SSPxSTAT<0>) is set when the CPU writes to SSPxBUF and is cleared when all 8 bits are shifted out.
WCOL Status Flag
If the user writes the SSPxBUF when a receive is already in progress (i.e., SSPxSR is still shifting in a data byte), the WCOL bit is set and the contents of the buffer are unchanged (the write doesn't occur).
18.4.10.2
WCOL Status Flag
If the user writes to the SSPxBUF when a transmit is already in progress (i.e., SSPxSR is still shifting out a data byte), the WCOL is set and the contents of the buffer are unchanged (the write doesn't occur) after 2 TCY after the SSPBUF write. If SSPBUF is rewritten within 2 TCY, the WCOL bit is set and SSPBUF is updated. This may result in a corrupted transfer.
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FIGURE 18-21:
Write SSPxCON2<0> (SEN = 1) Start condition begins From slave, clear ACKSTAT bit (SSPxCON2<6>)
R/W = 0
ACKSTAT in SSPxCON2 = 1
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SEN = 0 Transmit Address to Slave SDAx A7 SSPxBUF written with 7-bit address and R/W start transmit SCLx S 1 2 3 4 5 6 7 8 9 1 SCLx held low while CPU responds to SSPxIF 2 3 4 5 6 7 8 9 P A6 A5 A4 A3 A2 A1 ACK = 0 D7 D6 D5 D4 D3 D2 Transmitting Data or Second Half of 10-bit Address D1 D0 ACK SSPxIF Cleared in software Cleared in software service routine from SSP interrupt Cleared in software BF (SSPxSTAT<0>) SSPxBUF written SEN After Start condition, SEN cleared by hardware SSPxBUF is written in software PEN R/W
I 2CTM MASTER MODE WAVEFORM (TRANSMISSION, 7 OR 10-BIT ADDRESS)
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FIGURE 18-22:
DS39663A-page 216
Write to SSPxCON2<4> to start Acknowledge sequence SDAx = ACKDT (SSPxCON2<5>) = 0 Master configured as a receiver by programming SSPxCON2<3> (RCEN = 1) RCEN cleared automatically Receiving Data from Slave ACK Receiving Data from Slave ACK RCEN = 1, start next receive RCEN cleared automatically ACK from Master, SDAx = ACKDT = 0 Set ACKEN, start Acknowledge sequence SDAx = ACKDT = 1 PEN bit = 1 written here R/W = 0
Write to SSPxCON2<0> (SEN = 1), begin Start condition
SEN = 0 Write to SSPxBUF occurs here, ACK from Slave start XMIT
Transmit Address to Slave
SDAx D0
A7 A1 D7 D6 D5 D4 D3 D2 D1 D7 D6 D5 D4 D3 D2 D1
A6 A5 A4 A3 A2
D0
ACK
ACK is not sent
Bus master terminates transfer
SCLx
S
Set SSPxIF interrupt at end of receive
1 5 1 2 3 4 5 1 2 3 4 5
2
3 4 8 6 7 8 9
6
7 9
6
7
8
9
Set SSPxIF at end of receive
P
Set SSPxIF interrupt at end of Acknowledge sequence
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Data shifted in on falling edge of CLK
SSPxIF
Cleared in software Cleared in software
Set SSPxIF interrupt at end of Acknowledge sequence Cleared in software Cleared in software
I 2CTM MASTER MODE WAVEFORM (RECEPTION, 7-BIT ADDRESS)
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Last bit is shifted into SSPxSR and contents are unloaded into SSPxBUF
SDAx = 0, SCLx = 1 while CPU responds to SSPxIF
Cleared in software
Set P bit (SSPxSTAT<4>) and SSPxIF
BF (SSPxSTAT<0>)
SSPOV
SSPOV is set because SSPxBUF is still full
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ACKEN
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18.4.12 ACKNOWLEDGE SEQUENCE TIMING 18.4.13 STOP CONDITION TIMING
An Acknowledge sequence is enabled by setting the Acknowledge Sequence Enable bit, ACKEN (SSPxCON2<4>). When this bit is set, the SCLx pin is pulled low and the contents of the Acknowledge data bit are presented on the SDAx pin. If the user wishes to generate an Acknowledge, then the ACKDT bit should be cleared. If not, the user should set the ACKDT bit before starting an Acknowledge sequence. The Baud Rate Generator then counts for one rollover period (TBRG) and the SCLx pin is deasserted (pulled high). When the SCLx pin is sampled high (clock arbitration), the Baud Rate Generator counts for TBRG. The SCLx pin is then pulled low. Following this, the ACKEN bit is automatically cleared, the Baud Rate Generator is turned off and the MSSP module then goes into Idle mode (Figure 18-23). A Stop bit is asserted on the SDAx pin at the end of a receive/transmit by setting the Stop Sequence Enable bit, PEN (SSPxCON2<2>). At the end of a receive/transmit, the SCLx line is held low after the falling edge of the ninth clock. When the PEN bit is set, the master will assert the SDAx line low. When the SDAx line is sampled low, the Baud Rate Generator is reloaded and counts down to `0'. When the Baud Rate Generator times out, the SCLx pin will be brought high and one TBRG (Baud Rate Generator rollover count) later, the SDAx pin will be deasserted. When the SDAx pin is sampled high while SCLx is high, the P bit (SSPxSTAT<4>) is set. A TBRG later, the PEN bit is cleared and the SSPxIF bit is set (Figure 18-24).
18.4.13.1
WCOL Status Flag
18.4.12.1
WCOL Status Flag
If the user writes the SSPxBUF when an Acknowledge sequence is in progress, then WCOL is set and the contents of the buffer are unchanged (the write doesn't occur).
If the user writes the SSPxBUF when a Stop sequence is in progress, then the WCOL bit is set and the contents of the buffer are unchanged (the write doesn't occur).
FIGURE 18-23:
ACKNOWLEDGE SEQUENCE WAVEFORM
Acknowledge sequence starts here, write to SSPxCON2 ACKEN = 1, ACKDT = 0 TBRG SDAx D0 ACK TBRG ACKEN automatically cleared
SCLx
8
9
SSPxIF Cleared in software SSPxIF set at the end of Acknowledge sequence
SSPxIF set at the end of receive Note: TBRG = one Baud Rate Generator period.
Cleared in software
FIGURE 18-24:
STOP CONDITION RECEIVE OR TRANSMIT MODE
SCLx = 1 for TBRG, followed by SDAx = 1 for TBRG after SDAx sampled high. P bit (SSPxSTAT<4>) is set. PEN bit (SSPxCON2<2>) is cleared by hardware and the SSPxIF bit is set TBRG
Write to SSPxCON2, set PEN Falling edge of 9th clock SCLx
SDAx
ACK P TBRG TBRG TBRG SCLx brought high after TBRG SDAx asserted low before rising edge of clock to setup Stop condition
Note: TBRG = one Baud Rate Generator period.
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18.4.14 SLEEP OPERATION
2
18.4.17
While in Sleep mode, the I C module can receive addresses or data and when an address match or complete byte transfer occurs, wake the processor from Sleep (if the MSSP interrupt is enabled).
MULTI -MASTER COMMUNICATION, BUS COLLISION AND BUS ARBITRATION
18.4.15
EFFECTS OF A RESET
A Reset disables the MSSP module and terminates the current transfer.
18.4.16
MULTI-MASTER MODE
In Multi-Master mode, the interrupt generation on the detection of the Start and Stop conditions allows the determination of when the bus is free. The Stop (P) and Start (S) bits are cleared from a Reset or when the MSSP module is disabled. Control of the I 2C bus may be taken when the P bit (SSPxSTAT<4>) is set, or the bus is Idle, with both the S and P bits clear. When the bus is busy, enabling the SSP interrupt will generate the interrupt when the Stop condition occurs. In multi-master operation, the SDAx line must be monitored for arbitration to see if the signal level is the expected output level. This check is performed in hardware with the result placed in the BCLxIF bit. The states where arbitration can be lost are: * * * * * Address Transfer Data Transfer A Start Condition A Repeated Start Condition An Acknowledge Condition
Multi-Master mode support is achieved by bus arbitration. When the master outputs address/data bits onto the SDAx pin, arbitration takes place when the master outputs a `1' on SDAx, by letting SDAx float high and another master asserts a `0'. When the SCLx pin floats high, data should be stable. If the expected data on SDAx is a `1' and the data sampled on the SDAx pin = 0, then a bus collision has taken place. The master will set the Bus Collision Interrupt Flag, BCLxIF and reset the I2C port to its Idle state (Figure 18-25). If a transmit was in progress when the bus collision occurred, the transmission is halted, the BF flag is cleared, the SDAx and SCLx lines are deasserted and the SSPxBUF can be written to. When the user services the bus collision Interrupt Service Routine and if the I2C bus is free, the user can resume communication by asserting a Start condition. If a Start, Repeated Start, Stop or Acknowledge condition was in progress when the bus collision occurred, the condition is aborted, the SDAx and SCLx lines are deasserted and the respective control bits in the SSPxCON2 register are cleared. When the user services the bus collision Interrupt Service Routine and if the I2C bus is free, the user can resume communication by asserting a Start condition. The master will continue to monitor the SDAx and SCLx pins. If a Stop condition occurs, the SSPxIF bit will be set. A write to the SSPxBUF will start the transmission of data at the first data bit regardless of where the transmitter left off when the bus collision occurred. In Multi-Master mode, the interrupt generation on the detection of Start and Stop conditions allows the determination of when the bus is free. Control of the I2C bus can be taken when the P bit is set in the SSPxSTAT register, or the bus is Idle and the S and P bits are cleared.
FIGURE 18-25:
BUS COLLISION TIMING FOR TRANSMIT AND ACKNOWLEDGE
Data changes while SCLx = 0 SDAx line pulled low by another source SDAx released by master Sample SDAx. While SCLx is high, data doesn't match what is driven by the master. Bus collision has occurred.
SDAx
SCLx
Set bus collision interrupt (BCLxIF)
BCLxIF
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18.4.17.1 Bus Collision During a Start Condition
During a Start condition, a bus collision occurs if: a) b) SDAx or SCLx are sampled low at the beginning of the Start condition (Figure 18-26). SCLx is sampled low before SDAx is asserted low (Figure 18-27). If the SDAx pin is sampled low during this count, the BRG is reset and the SDAx line is asserted early (Figure 18-28). If, however, a `1' is sampled on the SDAx pin, the SDAx pin is asserted low at the end of the BRG count. The Baud Rate Generator is then reloaded and counts down to `0'. If the SCLx pin is sampled as `0' during this time, a bus collision does not occur. At the end of the BRG count, the SCLx pin is asserted low. Note: The reason that bus collision is not a factor during a Start condition is that no two bus masters can assert a Start condition at the exact same time. Therefore, one master will always assert SDAx before the other. This condition does not cause a bus collision because the two masters must be allowed to arbitrate the first address following the Start condition. If the address is the same, arbitration must be allowed to continue into the data portion, Repeated Start or Stop conditions.
During a Start condition, both the SDAx and the SCLx pins are monitored. If the SDAx pin is already low, or the SCLx pin is already low, then all of the following occur: * the Start condition is aborted; * the BCLxIF flag is set; and * the MSSP module is reset to its Idle state (Figure 18-26). The Start condition begins with the SDAx and SCLx pins deasserted. When the SDAx pin is sampled high, the Baud Rate Generator is loaded from SSPxADD<6:0> and counts down to `0'. If the SCLx pin is sampled low while SDAx is high, a bus collision occurs, because it is assumed that another master is attempting to drive a data `1' during the Start condition.
FIGURE 18-26:
BUS COLLISION DURING START CONDITION (SDAx ONLY)
SDAx goes low before the SEN bit is set. Set BCLxIF, S bit and SSPxIF set because SDAx = 0, SCLx = 1.
SDAx
SCLx Set SEN, enable Start condition if SDAx = 1, SCLx = 1 SEN SDAx sampled low before Start condition. Set BCLxIF. S bit and SSPxIF set because SDAx = 0, SCLx = 1. SSPxIF and BCLxIF are cleared in software S SEN cleared automatically because of bus collision. SSP module reset into Idle state.
BCLxIF
SSPxIF
SSPxIF and BCLxIF are cleared in software
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FIGURE 18-27: BUS COLLISION DURING START CONDITION (SCLx = 0)
SDAx = 0, SCLx = 1
TBRG TBRG
SDAx
SCLx
Set SEN, enable Start sequence if SDAx = 1, SCLx = 1 SCLx = 0 before SDAx = 0, bus collision occurs. Set BCLxIF. SCLx = 0 before BRG time-out, bus collision occurs. Set BCLxIF.
SEN
BCLxIF Interrupt cleared in software S SSPxIF `0' `0' `0' `0'
FIGURE 18-28:
BRG RESET DUE TO SDAx ARBITRATION DURING START CONDITION
SDAx = 0, SCLx = 1 Set S Less than TBRG TBRG Set SSPxIF
SDAx
SDAx pulled low by other master. Reset BRG and assert SDAx.
SCLx
S
SCLx pulled low after BRG time-out Set SEN, enable Start sequence if SDAx = 1, SCLx = 1
SEN
BCLxIF
`0'
S
SSPxIF SDAx = 0, SCLx = 1, set SSPxIF Interrupts cleared in software
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18.4.17.2 Bus Collision During a Repeated Start Condition
During a Repeated Start condition, a bus collision occurs if: a) b) A low level is sampled on SDAx when SCLx goes from low level to high level. SCLx goes low before SDAx is asserted low, indicating that another master is attempting to transmit a data `1'. If SDAx is low, a bus collision has occurred (i.e., another master is attempting to transmit a data `0', see Figure 18-29). If SDAx is sampled high, the BRG is reloaded and begins counting. If SDAx goes from high-to-low before the BRG times out, no bus collision occurs because no two masters can assert SDAx at exactly the same time. If SCLx goes from high-to-low before the BRG times out and SDAx has not already been asserted, a bus collision occurs. In this case, another master is attempting to transmit a data `1' during the Repeated Start condition (see Figure 18-30). If, at the end of the BRG time-out, both SCLx and SDAx are still high, the SDAx pin is driven low and the BRG is reloaded and begins counting. At the end of the count, regardless of the status of the SCLx pin, the SCLx pin is driven low and the Repeated Start condition is complete.
When the user deasserts SDAx and the pin is allowed to float high, the BRG is loaded with SSPxADD<6:0> and counts down to `0'. The SCLx pin is then deasserted and when sampled high, the SDAx pin is sampled.
FIGURE 18-29:
SDAx
BUS COLLISION DURING A REPEATED START CONDITION (CASE 1)
SCLx
Sample SDAx when SCLx goes high. If SDAx = 0, set BCLxIF and release SDAx and SCLx. RSEN
BCLxIF Cleared in software S SSPxIF `0' `0'
FIGURE 18-30:
BUS COLLISION DURING REPEATED START CONDITION (CASE 2)
TBRG TBRG
SDAx SCLx SCLx goes low before SDAx, set BCLxIF. Release SDAx and SCLx. Interrupt cleared in software RSEN S SSPxIF `0'
BCLxIF
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18.4.17.3 Bus Collision During a Stop Condition
Bus collision occurs during a Stop condition if: a) After the SDAx pin has been deasserted and allowed to float high, SDAx is sampled low after the BRG has timed out. After the SCLx pin is deasserted, SCLx is sampled low before SDAx goes high. The Stop condition begins with SDAx asserted low. When SDAx is sampled low, the SCLx pin is allowed to float. When the pin is sampled high (clock arbitration), the Baud Rate Generator is loaded with SSPxADD<6:0> and counts down to `0'. After the BRG times out, SDAx is sampled. If SDAx is sampled low, a bus collision has occurred. This is due to another master attempting to drive a data `0' (Figure 18-31). If the SCLx pin is sampled low before SDAx is allowed to float high, a bus collision occurs. This is another case of another master attempting to drive a data `0' (Figure 18-32).
b)
FIGURE 18-31:
BUS COLLISION DURING A STOP CONDITION (CASE 1)
TBRG TBRG TBRG SDAx sampled low after TBRG, set BCLxIF
SDAx SDAx asserted low SCLx PEN BCLxIF P SSPxIF `0' `0'
FIGURE 18-32:
BUS COLLISION DURING A STOP CONDITION (CASE 2)
TBRG TBRG TBRG
SDAx Assert SDAx SCLx PEN BCLxIF P SSPxIF `0' `0' SCLx goes low before SDAx goes high, set BCLxIF
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TABLE 18-4:
Name INTCON PIR1 PIE1 IPR1 PIR2 PIE2 IPR2 PIR3 PIE3 IPR3 TRISC TRISD SSP1BUF SSP1ADD SSP1CON1 SSP1CON2 SSP1STAT SSP2BUF SSP2ADD SSP2CON1 SSP2CON2 SSP2STAT
REGISTERS ASSOCIATED WITH I2CTM OPERATION
Bit 7 Bit 6 Bit 5 Bit 4 INT0IE TX1IF TX1IE TX1IP -- -- -- TX2IF TX2IE TX2IP TRISC4 TRISD4 Bit 3 RBIE SSP1IF SSP1IE SSP1IP BCL1IF BCL1IE BCL1IP TMR4IF TMR4IE TMR4IP TRISC3 TRISD3 Bit 2 TMR0IF CCP1IF CCP1IE CCP1IP -- -- -- CCP5IF CCP5IE CCP5IP TRISC2 TRISD2 Bit 1 INT0IF TMR2IF TMR2IE TMR2IP TMR3IF TMR3IE TMR3IP CCP4IF CCP4IE CCP4IP TRISC1 TRISD1 Bit 0 RBIF TMR1IF TMR1IE TMR1IP CCP2IF CCP2IE CCP2IP CCP3IF CCP3IE CCP3IP TRISC0 TRISD0 Reset Values on Page 49 51 51 51 51 51 51 51 51 51 52 52 50 53 SSPM2 PEN R/W SSPM1 RSEN UA SSPM0 SEN BF 50 50 50 50 53 SSPM2 PEN R/W SSPM1 RSEN UA SSPM0 SEN BF 53 53 53
GIE/GIEH PEIE/GIEL TMR0IE PSPIF PSPIE PSPIP OSCFIF OSCFIE OSCFIP SSP2IF SSP2IE SSP2IP TRISC7 TRISD7 ADIF ADIE ADIP CMIF CMIE CMIP BCL2IF BCL2IE BCL2IP TRISC6 TRISD6 RC1IF RC1IE RC1IP -- -- -- RC2IF RC2IE RC2IP TRISC5 TRISD5
MSSP1 Receive Buffer/Transmit Register MSSP1 Address Register (I2CTM Slave mode), MSSP1 Baud Rate Reload Register (I2C Master mode) WCOL GCEN SMP SSPOV ACKSTAT CKE SSPEN ACKDT D/A (I2C CKP ACKEN P SSPM3 RCEN S
MSSP2 Receive Buffer/Transmit Register MSSP2 Address Register Slave mode), MSSP2 Baud Rate Reload Register (I2C Master mode) WCOL GCEN SMP SSPOV ACKSTAT CKE SSPEN ACKDT D/A CKP ACKEN P SSPM3 RCEN S
Legend: -- = unimplemented, read as `0'. Shaded cells are not used by the MSSP module in I2CTM mode.
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NOTES:
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19.0 ENHANCED UNIVERSAL SYNCHRONOUS ASYNCHRONOUS RECEIVER TRANSMITTER (EUSART)
The pins of EUSART1 and EUSART2 are multiplexed with the functions of PORTC (RC6/TX1/CK1 and RC7/RX1/DT1) and PORTG (RG1/TX2/CK2 and RG2/RX2/DT2), respectively. In order to configure these pins as an EUSART: * For EUSART1: - bit SPEN (RCSTA1<7>) must be set (= 1) - bit TRISC<7> must be set (= 1) - bit TRISC<6> must be cleared (= 0) for Asynchronous and Synchronous Master modes - bit TRISC<6> must be set (= 1) for Synchronous Slave mode * For EUSART2: - bit SPEN (RCSTA2<7>) must be set (= 1) - bit TRISG<2> must be set (= 1) - bit TRISG<1> must be cleared (= 0) for Asynchronous and Synchronous Master modes - bit TRISC<6> must be set (= 1) for Synchronous Slave mode Note: The EUSART control will automatically reconfigure the pin from input to output as needed.
The Enhanced Universal Synchronous Asynchronous Receiver Transmitter (EUSART) module is one of two serial I/O modules. (Generically, the EUSART is also known as a Serial Communications Interface or SCI.) The EUSART can be configured as a full-duplex asynchronous system that can communicate with peripheral devices, such as CRT terminals and personal computers. It can also be configured as a half-duplex synchronous system that can communicate with peripheral devices, such as A/D or D/A integrated circuits, serial EEPROMs, etc. The Enhanced USART module implements additional features, including automatic baud rate detection and calibration, automatic wake-up on Sync Break reception and 12-bit Break character transmit. These make it ideally suited for use in Local Interconnect Network bus (LIN bus) systems. All members of the PIC18F87J10 family are equipped with two independent EUSART modules, referred to as EUSART1 and EUSART2. They can be configured in the following modes: * Asynchronous (full duplex) with: - Auto-Wake-up on character reception - Auto-Baud calibration - 12-bit Break character transmission * Synchronous - Master (half duplex) with selectable clock polarity * Synchronous - Slave (half duplex) with selectable clock polarity
The operation of each Enhanced USART module is controlled through three registers: * Transmit Status and Control (TXSTAx) * Receive Status and Control (RCSTAx) * Baud Rate Control (BAUDCONx) These are detailed on the following pages in Register 19-1, Register 19-2 and Register 19-3, respectively. Note: Throughout this section, references to register and bit names that may be associated with a specific EUSART module are referred to generically by the use of `x' in place of the specific module number. Thus, "RCSTAx" might refer to the Receive Status register for either EUSART1 or EUSART2.
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REGISTER 19-1: TXSTAx: TRANSMIT STATUS AND CONTROL REGISTER
R/W-0 CSRC bit 7 bit 7 CSRC: Clock Source Select bit Asynchronous mode: Don't care. Synchronous mode: 1 = Master mode (clock generated internally from BRG) 0 = Slave mode (clock from external source) TX9: 9-bit Transmit Enable bit 1 = Selects 9-bit transmission 0 = Selects 8-bit transmission TXEN: Transmit Enable bit 1 = Transmit enabled 0 = Transmit disabled Note: bit 4 SREN/CREN overrides TXEN in Sync mode. R/W-0 TX9 R/W-0 TXEN R/W-0 SYNC R/W-0 SENDB R/W-0 BRGH R-1 TRMT R/W-0 TX9D bit 0
bit 6
bit 5
SYNC: EUSART Mode Select bit 1 = Synchronous mode 0 = Asynchronous mode SENDB: Send Break Character bit Asynchronous mode: 1 = Send Sync Break on next transmission (cleared by hardware upon completion) 0 = Sync Break transmission completed Synchronous mode: Don't care. BRGH: High Baud Rate Select bit Asynchronous mode: 1 = High speed 0 = Low speed Synchronous mode: Unused in this mode. TRMT: Transmit Shift Register Status bit 1 = TSR empty 0 = TSR full TX9D: 9th bit of Transmit Data Can be address/data bit or a parity bit. Legend: R = Readable bit -n = Value at POR W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown
bit 3
bit 2
bit 1
bit 0
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REGISTER 19-2: RCSTAx: RECEIVE STATUS AND CONTROL REGISTER
R/W-0 SPEN bit 7 bit 7 SPEN: Serial Port Enable bit 1 = Serial port enabled (configures RXx/DTx and TXx/CKx pins as serial port pins) 0 = Serial port disabled (held in Reset) RX9: 9-bit Receive Enable bit 1 = Selects 9-bit reception 0 = Selects 8-bit reception SREN: Single Receive Enable bit Asynchronous mode: Don't care. Synchronous mode - Master: 1 = Enables single receive 0 = Disables single receive This bit is cleared after reception is complete. Synchronous mode - Slave: Don't care. CREN: Continuous Receive Enable bit Asynchronous mode: 1 = Enables receiver 0 = Disables receiver Synchronous mode: 1 = Enables continuous receive until enable bit CREN is cleared (CREN overrides SREN) 0 = Disables continuous receive ADDEN: Address Detect Enable bit Asynchronous mode 9-bit (RX9 = 1): 1 = Enables address detection, enables interrupt and loads the receive buffer when RSR<8> is set 0 = Disables address detection, all bytes are received and ninth bit can be used as parity bit Asynchronous mode 9-bit (RX9 = 0): Don't care. FERR: Framing Error bit 1 = Framing error (can be updated by reading RCREGx register and receiving next valid byte) 0 = No framing error OERR: Overrun Error bit 1 = Overrun error (can be cleared by clearing bit CREN) 0 = No overrun error RX9D: 9th bit of Received Data This can be address/data bit or a parity bit and must be calculated by user firmware. Legend: R = Readable bit -n = Value at POR W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown R/W-0 RX9 R/W-0 SREN R/W-0 CREN R/W-0 ADDEN R-0 FERR R-0 OERR R-x RX9D bit 0
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
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REGISTER 19-3: BAUDCONx: BAUD RATE CONTROL REGISTER
R/W-0 ABDOVF bit 7 bit 7 ABDOVF: Auto-Baud Acquisition Rollover Status bit 1 = A BRG rollover has occurred during Auto-Baud Rate Detect mode (must be cleared in software) 0 = No BRG rollover has occurred RCMT: Receive Operation Idle Status bit 1 = Receive operation is Idle 0 = Receive operation is active Unimplemented: Read as `0' SCKP: Synchronous Clock Polarity Select bit Asynchronous mode: Unused in this mode. Synchronous mode: 1 = Idle state for clock (CKx) is a high level 0 = Idle state for clock (CKx) is a low level BRG16: 16-bit Baud Rate Register Enable bit 1 = 16-bit Baud Rate Generator - SPBRGHx and SPBRGx 0 = 8-bit Baud Rate Generator - SPBRGx only (Compatible mode), SPBRGHx value ignored Unimplemented: Read as `0' WUE: Wake-up Enable bit Asynchronous mode: 1 = EUSART will continue to sample the RXx pin - interrupt generated on falling edge; bit cleared in hardware on following rising edge 0 = RXx pin not monitored or rising edge detected Synchronous mode: Unused in this mode. ABDEN: Auto-Baud Detect Enable bit Asynchronous mode: 1 = Enable baud rate measurement on the next character. Requires reception of a Sync field (55h); cleared in hardware upon completion 0 = Baud rate measurement disabled or completed Synchronous mode: Unused in this mode. Legend: R = Readable bit -n = Value at POR W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown R-1 RCMT U-0 -- R/W-0 SCKP R/W-0 BRG16 U-0 -- R/W-0 WUE R/W-0 ABDEN bit 0
bit 6
bit 5 bit 4
bit 3
bit 2 bit 1
bit 0
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19.1 Baud Rate Generator (BRG)
The BRG is a dedicated 8-bit or 16-bit generator that supports both the Asynchronous and Synchronous modes of the EUSART. By default, the BRG operates in 8-bit mode; setting the BRG16 bit (BAUDCONx<3>) selects 16-bit mode. The SPBRGHx:SPBRGx register pair controls the period of a free running timer. In Asynchronous mode, bits BRGH (TXSTAx<2>) and BRG16 (BAUDCONx<3>) also control the baud rate. In Synchronous mode, BRGH is ignored. Table 19-1 shows the formula for computation of the baud rate for different EUSART modes which only apply in Master mode (internally generated clock). Given the desired baud rate and FOSC, the nearest integer value for the SPBRGHx:SPBRGx registers can be calculated using the formulas in Table 19-1. From this, the error in baud rate can be determined. An example calculation is shown in Example 19-1. Typical baud rates and error values for the various Asynchronous modes are shown in Table 19-2. It may be advantageous to use the high baud rate (BRGH = 1) or the 16-bit BRG to reduce the baud rate error, or achieve a slow baud rate for a fast oscillator frequency. Writing a new value to the SPBRGHx:SPBRGx registers causes the BRG timer to be reset (or cleared). This ensures the BRG does not wait for a timer overflow before outputting the new baud rate.
19.1.1
OPERATION IN POWER-MANAGED MODES
The device clock is used to generate the desired baud rate. When one of the power-managed modes is entered, the new clock source may be operating at a different frequency. This may require an adjustment to the value in the SPBRGx register pair.
19.1.2
SAMPLING
The data on the RXx pin (either RC7/RX1/DT1 or RG2/RX2/DT2) is sampled three times by a majority detect circuit to determine if a high or a low level is present at the RXx pin.
TABLE 19-1:
SYNC 0 0 0 0 1 1
BAUD RATE FORMULAS
BRG16 0 0 1 1 0 1 BRGH 0 1 0 1 x x BRG/EUSART Mode 8-bit/Asynchronous 8-bit/Asynchronous 16-bit/Asynchronous 16-bit/Asynchronous 8-bit/Synchronous 16-bit/Synchronous FOSC/[4 (n + 1)] Baud Rate Formula FOSC/[64 (n + 1)] FOSC/[16 (n + 1)]
Configuration Bits
Legend: x = Don't care, n = value of SPBRGHx:SPBRGx register pair
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EXAMPLE 19-1: CALCULATING BAUD RATE ERROR
For a device with FOSC of 16 MHz, desired baud rate of 9600, Asynchronous mode, 8-bit BRG: Desired Baud Rate = FOSC/(64 ([SPBRGHx:SPBRGx] + 1)) Solving for SPBRGHx:SPBRGx: X = ((FOSC/Desired Baud Rate)/64) - 1 = ((16000000/9600)/64) - 1 = [25.042] = 25 Calculated Baud Rate = 16000000/(64 (25 + 1)) = 9615 Error = (Calculated Baud Rate - Desired Baud Rate)/Desired Baud Rate = (9615 - 9600)/9600 = 0.16%
TABLE 19-2:
Name TXSTAx RCSTAx SPBRGHx SPBRGx
REGISTERS ASSOCIATED WITH BAUD RATE GENERATOR
Bit 7 CSRC SPEN Bit 6 TX9 RX9 RCMT Bit 5 TXEN SREN -- Bit 4 SYNC CREN SCKP Bit 3 SENDB ADDEN BRG16 Bit 2 BRGH FERR -- Bit 1 TRMT OERR WUE Bit 0 TX9D RX9D ABDEN Reset Values on page 51 51 52 52 52
BAUDCONx ABDOVF
EUSARTx Baud Rate Generator Register High Byte EUSARTx Baud Rate Generator Register Low Byte
Legend: -- = unimplemented, read as `0'. Shaded cells are not used by the BRG.
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TABLE 19-3:
BAUD RATE (K)
BAUD RATES FOR ASYNCHRONOUS MODES
SYNC = 0, BRGH = 0, BRG16 = 0 FOSC = 20.000 MHz Actual Rate (K) -- 1.221 2.404 9.766 19.531 62.500 104.167 % Error -- 1.73 0.16 1.73 1.73 8.51 -9.58 SPBRG value
(decimal)
FOSC = 40.000 MHz Actual Rate (K) -- -- 2.441 9.615 19.531 56.818 125.000 % Error -- -- 1.73 0.16 1.73 -1.36 8.51 SPBRG value
(decimal)
FOSC = 10.000 MHz Actual Rate (K) -- 1.202 2.404 9.766 19.531 52.083 78.125 % Error -- 0.16 0.16 1.73 1.73 -9.58 -32.18 SPBRG value
(decimal)
FOSC = 8.000 MHz Actual Rate (K) -- 1201 2403 9615 -- -- -- % Error -- -0.16 -0.16 -0.16 -- -- -- SPBRG value
(decimal)
0.3 1.2 2.4 9.6 19.2 57.6 115.2
-- -- 255 64 31 10 4
-- 255 129 31 15 4 2
-- 129 64 15 7 2 1
-- 103 51 12 -- -- --
SYNC = 0, BRGH = 0, BRG16 = 0 BAUD RATE (K) FOSC = 4.000 MHz Actual Rate (K) 0.300 1.202 2.404 8.929 20.833 62.500 62.500 % Error 0.16 0.16 0.16 -6.99 8.51 8.51 -45.75 SPBRG value
(decimal)
FOSC = 2.000 MHz Actual Rate (K) 300 1201 2403 -- -- -- -- % Error -0.16 -0.16 -0.16 -- -- -- -- SPBRG value
(decimal)
FOSC = 1.000 MHz Actual Rate (K) 300 1201 -- -- -- -- -- % Error -0.16 -0.16 -- -- -- -- -- SPBRG value
(decimal)
0.3 1.2 2.4 9.6 19.2 57.6 115.2
207 51 25 6 2 0 0
103 25 12 -- -- -- --
51 12 -- -- -- -- --
SYNC = 0, BRGH = 1, BRG16 = 0 BAUD RATE (K) FOSC = 40.000 MHz Actual Rate (K) -- -- -- 9.766 19.231 58.140 113.636 % Error -- -- -- 1.73 0.16 0.94 -1.36 SPBRG value
(decimal)
FOSC = 20.000 MHz Actual Rate (K) -- -- -- 9.615 19.231 56.818 113.636 % Error -- -- -- 0.16 0.16 -1.36 -1.36 SPBRG value
(decimal)
FOSC = 10.000 MHz Actual Rate (K) -- -- 2.441 9.615 19.531 56.818 125.000 % Error -- -- 1.73 0.16 1.73 -1.36 8.51 SPBRG value
(decimal)
FOSC = 8.000 MHz Actual Rate (K) -- -- 2403 9615 19230 55555 -- % Error -- -- -0.16 -0.16 -0.16 3.55 -- SPBRG value
(decimal)
0.3 1.2 2.4 9.6 19.2 57.6 115.2
-- -- -- 255 129 42 21
-- -- -- 129 64 21 10
-- -- 255 64 31 10 4
-- -- 207 51 25 8 --
SYNC = 0, BRGH = 1, BRG16 = 0 BAUD RATE (K) FOSC = 4.000 MHz Actual Rate (K) -- 1.202 2.404 9.615 19.231 62.500 125.000 % Error -- 0.16 0.16 0.16 0.16 8.51 8.51 SPBRG value
(decimal)
FOSC = 2.000 MHz Actual Rate (K) -- 1201 2403 9615 -- -- -- % Error -- -0.16 -0.16 -0.16 -- -- -- SPBRG value
(decimal)
FOSC = 1.000 MHz Actual Rate (K) 300 1201 2403 -- -- -- -- % Error -0.16 -0.16 -0.16 -- -- -- -- SPBRG value
(decimal)
0.3 1.2 2.4 9.6 19.2 57.6 115.2
-- 207 103 25 12 3 1
-- 103 51 12 -- -- --
207 51 25 -- -- -- --
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TABLE 19-3:
BAUD RATE (K)
BAUD RATES FOR ASYNCHRONOUS MODES (CONTINUED)
SYNC = 0, BRGH = 0, BRG16 = 1 FOSC = 20.000 MHz Actual Rate (K) 0.300 1.200 2.399 9.615 19.231 56.818 113.636 % Error 0.02 -0.03 -0.03 0.16 0.16 -1.36 -1.36 SPBRG value
(decimal)
FOSC = 40.000 MHz Actual Rate (K) 0.300 1.200 2.402 9.615 19.231 58.140 113.636 % Error 0.00 0.02 0.06 0.16 0.16 0.94 -1.36 SPBRG value
(decimal)
FOSC = 10.000 MHz Actual Rate (K) 0.300 1.200 2.404 9.615 19.531 56.818 125.000 % Error 0.02 -0.03 0.16 0.16 1.73 -1.36 8.51 SPBRG value
(decimal)
FOSC = 8.000 MHz Actual Rate (K) 300 1201 2403 9615 19230 55555 -- % Error -0.04 -0.16 -0.16 -0.16 -0.16 3.55 -- SPBRG value
(decimal)
0.3 1.2 2.4 9.6 19.2 57.6 115.2
8332 2082 1040 259 129 42 21
4165 1041 520 129 64 21 10
2082 520 259 64 31 10 4
1665 415 207 51 25 8 --
SYNC = 0, BRGH = 0, BRG16 = 1 BAUD RATE (K) FOSC = 4.000 MHz Actual Rate (K) 0.300 1.202 2.404 9.615 19.231 62.500 125.000 % Error 0.04 0.16 0.16 0.16 0.16 8.51 8.51 SPBRG value
(decimal)
FOSC = 2.000 MHz Actual Rate (K) 300 1201 2403 9615 -- -- -- % Error -0.16 -0.16 -0.16 -0.16 -- -- -- SPBRG value
(decimal)
FOSC = 1.000 MHz Actual Rate (K) 300 1201 2403 -- -- -- -- % Error -0.16 -0.16 -0.16 -- -- -- -- SPBRG value
(decimal)
0.3 1.2 2.4 9.6 19.2 57.6 115.2
832 207 103 25 12 3 1
415 103 51 12 -- -- --
207 51 25 -- -- -- --
SYNC = 0, BRGH = 1, BRG16 = 1 or SYNC = 1, BRG16 = 1 BAUD RATE (K) FOSC = 40.000 MHz Actual Rate (K) 0.300 1.200 2.400 9.606 19.193 57.803 114.943 % Error 0.00 0.00 0.02 0.06 -0.03 0.35 -0.22 SPBRG value
(decimal)
FOSC = 20.000 MHz Actual Rate (K) 0.300 1.200 2.400 9.596 19.231 57.471 116.279 % Error 0.00 0.02 0.02 -0.03 0.16 -0.22 0.94 SPBRG value
(decimal)
FOSC = 10.000 MHz Actual Rate (K) 0.300 1.200 2.402 9.615 19.231 58.140 113.636 % Error 0.00 0.02 0.06 0.16 0.16 0.94 -1.36 SPBRG value
(decimal)
FOSC = 8.000 MHz Actual Rate (K) 300 1200 2400 9615 19230 57142 117647 % Error -0.01 -0.04 -0.04 -0.16 -0.16 0.79 -2.12 SPBRG value
(decimal)
0.3 1.2 2.4 9.6 19.2 57.6 115.2
33332 8332 4165 1040 520 172 86
16665 4165 2082 520 259 86 42
8332 2082 1040 259 129 42 21
6665 1665 832 207 103 34 16
SYNC = 0, BRGH = 1, BRG16 = 1 or SYNC = 1, BRG16 = 1 BAUD RATE (K) FOSC = 4.000 MHz Actual Rate (K) 0.300 1.200 2.404 9.615 19.231 58.824 111.111 % Error 0.01 0.04 0.16 0.16 0.16 2.12 -3.55 SPBRG value
(decimal)
FOSC = 2.000 MHz Actual Rate (K) 300 1201 2403 9615 19230 55555 -- % Error -0.04 -0.16 -0.16 -0.16 -0.16 3.55 -- SPBRG value
(decimal)
FOSC = 1.000 MHz Actual Rate (K) 300 1201 2403 9615 19230 -- -- % Error -0.04 -0.16 -0.16 -0.16 -0.16 -- -- SPBRG value
(decimal)
0.3 1.2 2.4 9.6 19.2 57.6 115.2
3332 832 415 103 51 16 8
1665 415 207 51 25 8 --
832 207 103 25 12 -- --
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19.1.3 AUTO-BAUD RATE DETECT
The Enhanced USART module supports the automatic detection and calibration of baud rate. This feature is active only in Asynchronous mode and while the WUE bit is clear. The automatic baud rate measurement sequence (Figure 19-1) begins whenever a Start bit is received and the ABDEN bit is set. The calculation is self-averaging. In the Auto-Baud Rate Detect (ABD) mode, the clock to the BRG is reversed. Rather than the BRG clocking the incoming RXx signal, the RXx signal is timing the BRG. In ABD mode, the internal Baud Rate Generator is used as a counter to time the bit period of the incoming serial byte stream. Once the ABDEN bit is set, the state machine will clear the BRG and look for a Start bit. The Auto-Baud Rate Detect must receive a byte with the value 55h (ASCII "U", which is also the LIN bus Sync character) in order to calculate the proper bit rate. The measurement is taken over both a low and a high bit time in order to minimize any effects caused by asymmetry of the incoming signal. After a Start bit, the SPBRGx begins counting up, using the preselected clock source on the first rising edge of RXx. After eight bits on the RXx pin or the fifth rising edge, an accumulated value totalling the proper BRG period is left in the SPBRGHx:SPBRGx register pair. Once the 5th edge is seen (this should correspond to the Stop bit), the ABDEN bit is automatically cleared. If a rollover of the BRG occurs (an overflow from FFFFh to 0000h), the event is trapped by the ABDOVF status bit (BAUDCONx<7>). It is set in hardware by BRG rollovers and can be set or cleared by the user in software. ABD mode remains active after rollover events and the ABDEN bit remains set (Figure 19-2). While calibrating the baud rate period, the BRG registers are clocked at 1/8th the preconfigured clock rate. Note that the BRG clock will be configured by the BRG16 and BRGH bits. Independent of the BRG16 bit setting, both the SPBRGx and SPBRGHx will be used as a 16-bit counter. This allows the user to verify that no carry occurred for 8-bit modes by checking for 00h in the SPBRGHx register. Refer to Table 19-4 for counter clock rates to the BRG. While the ABD sequence takes place, the EUSART state machine is held in Idle. The RCxIF interrupt is set once the fifth rising edge on RXx is detected. The value in the RCREGx needs to be read to clear the RCxIF interrupt. The contents of RCREGx should be discarded. Note 1: If the WUE bit is set with the ABDEN bit, Auto-Baud Rate Detection will occur on the byte following the Break character. 2: It is up to the user to determine that the incoming character baud rate is within the range of the selected BRG clock source. Some combinations of oscillator frequency and EUSART baud rates are not possible due to bit error rates. Overall system timing and communication baud rates must be taken into consideration when using the Auto-Baud Rate Detection feature.
TABLE 19-4:
BRG16 0 0 1 1 Note: BRGH 0 1 0 1
BRG COUNTER CLOCK RATES
BRG Counter Clock FOSC/512 FOSC/128 FOSC/128 FOSC/32
During the ABD sequence, SPBRGx and SPBRGHx are both used as a 16-bit counter, independent of BRG16 setting.
19.1.3.1
ABD and EUSART Transmission
Since the BRG clock is reversed during ABD acquisition, the EUSART transmitter cannot be used during ABD. This means that whenever the ABDEN bit is set, TXREGx cannot be written to. Users should also ensure that ABDEN does not become set during a transmit sequence. Failing to do this may result in unpredictable EUSART operation.
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FIGURE 19-1:
BRG Value
AUTOMATIC BAUD RATE CALCULATION
XXXXh 0000h Edge #1 Bit 1 Edge #2 Bit 3 Edge #3 Bit 5 Edge #4 Bit 7 001Ch Edge #5 Stop Bit
RXx pin
Start
Bit 0
Bit 2
Bit 4
Bit 6
BRG Clock Set by User ABDEN bit RCxIF bit (Interrupt) Read RCREGx SPBRGx SPBRGHx XXXXh XXXXh 1Ch 00h Auto-Cleared
Note: The ABD sequence requires the EUSART module to be configured in Asynchronous mode and WUE = 0.
FIGURE 19-2:
BRG Clock ABDEN bit RXx pin ABDOVF bit
BRG OVERFLOW SEQUENCE
Start
Bit 0
FFFFh BRG Value XXXXh 0000h 0000h
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19.2 EUSART Asynchronous Mode
The Asynchronous mode of operation is selected by clearing the SYNC bit (TXSTAx<4>). In this mode, the EUSART uses standard Non-Return-to-Zero (NRZ) format (one Start bit, eight or nine data bits and one Stop bit). The most common data format is 8 bits. An on-chip dedicated 8-bit/16-bit Baud Rate Generator can be used to derive standard baud rate frequencies from the oscillator. The EUSART transmits and receives the LSb first. The EUSART's transmitter and receiver are functionally independent but use the same data format and baud rate. The Baud Rate Generator produces a clock, either x16 or x64 of the bit shift rate, depending on the BRGH and BRG16 bits (TXSTAx<2> and BAUDCONx<3>). Parity is not supported by the hardware but can be implemented in software and stored as the 9th data bit. When operating in Asynchronous mode, the EUSART module consists of the following important elements: * * * * * * * Baud Rate Generator Sampling Circuit Asynchronous Transmitter Asynchronous Receiver Auto-Wake-up on Sync Break Character 12-bit Break Character Transmit Auto-Baud Rate Detection Once the TXREGx register transfers the data to the TSR register (occurs in one TCY), the TXREGx register is empty and the TX1IF flag bit (PIR1<4>) is set. This interrupt can be enabled or disabled by setting or clearing the interrupt enable bit, TX1IE (PIE1<4>). TX1IF will be set regardless of the state of TX1IE; it cannot be cleared in software. TX1IF is also not cleared immediately upon loading TXREGx, but becomes valid in the second instruction cycle following the load instruction. Polling TX1IF immediately following a load of TXREGx will return invalid results. While TX1IF indicates the status of the TXREGx register, another bit, TRMT (TXSTAx<1>), shows the status of the TSR register. TRMT is a read-only bit which is set when the TSR register is empty. No interrupt logic is tied to this bit so the user has to poll this bit in order to determine if the TSR register is empty. Note 1: The TSR register is not mapped in data memory, so it is not available to the user. 2: Flag bit TX1IF is set when enable bit TXEN is set. To set up an Asynchronous Transmission: 1. Initialize the SPBRGHx:SPBRGx registers for the appropriate baud rate. Set or clear the BRGH and BRG16 bits, as required, to achieve the desired baud rate. Enable the asynchronous serial port by clearing bit SYNC and setting bit SPEN. If interrupts are desired, set enable bit TXxIE. If 9-bit transmission is desired, set transmit bit TX9. Can be used as address/data bit. Enable the transmission by setting bit TXEN which will also set bit TXxIF. If 9-bit transmission is selected, the ninth bit should be loaded in bit TX9D. Load data to the TXREGx register (starts transmission). If using interrupts, ensure that the GIE and PEIE bits in the INTCON register (INTCON<7:6>) are set.
19.2.1
EUSART ASYNCHRONOUS TRANSMITTER
2. 3. 4. 5. 6. 7. 8.
The EUSART transmitter block diagram is shown in Figure 19-3. The heart of the transmitter is the Transmit (Serial) Shift Register (TSR). The Shift register obtains its data from the Read/Write Transmit Buffer register, TXREGx. The TXREGx register is loaded with data in software. The TSR register is not loaded until the Stop bit has been transmitted from the previous load. As soon as the Stop bit is transmitted, the TSR is loaded with new data from the TXREGx register (if available).
FIGURE 19-3:
EUSART TRANSMIT BLOCK DIAGRAM
Data Bus TXxIF TXxIE MSb (8) Interrupt TXEN Baud Rate CLK TRMT SPEN *** TSR Register TXREGx Register 8 LSb 0 Pin Buffer and Control TXx pin
BRG16
SPBRGHx SPBRGx Baud Rate Generator
TX9 TX9D
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FIGURE 19-4:
Write to TXREGx BRG Output (Shift Clock) TXx (pin) TXxIF bit (Transmit Buffer Reg. Empty Flag) Word 1
ASYNCHRONOUS TRANSMISSION
Start bit
bit 0
bit 1 Word 1
bit 7/8
Stop bit
1 TCY
TRMT bit (Transmit Shift Reg. Empty Flag)
Word 1 Transmit Shift Reg
FIGURE 19-5:
Write to TXREGx
ASYNCHRONOUS TRANSMISSION (BACK TO BACK)
Word 2
Word 1 BRG Output (Shift Clock) TXx (pin) 1 TCY
Start bit
bit 0
bit 1 Word 1
bit 7/8
Stop bit
Start bit Word 2
bit 0
TXxIF bit (Interrupt Reg. Flag)
1 TCY TRMT bit (Transmit Shift Reg. Empty Flag) Word 1 Transmit Shift Reg. Word 2 Transmit Shift Reg.
Note: This timing diagram shows two consecutive transmissions.
TABLE 19-5:
Name INTCON PIR1 PIE1 IPR1 PIR3 PIE3 IPR3 RCSTAx TXREGx TXSTAx BAUDCONx SPBRGHx SPBRGx
REGISTERS ASSOCIATED WITH ASYNCHRONOUS TRANSMISSION
Bit 7 Bit 6 Bit 5 TMR0IE RC1IF RC1IE RC1IP RC2IF RC2IE RC2IP SREN TXEN -- Bit 4 INT0IE TX1IF TX1IE TX1IP TX2IF TX2IE TX2IP CREN SYNC SCKP Bit 3 RBIE SSP1IF SSP1IE SSP1IP TMR4IF TMR4IE TMR4IP ADDEN SENDB BRG16 Bit 2 TMR0IF CCP1IF CCP1IE CCP1IP CCP5IF CCP5IE CCP5IP FERR BRGH -- Bit 1 INT0IF TMR2IF TMR2IE TMR2IP CCP4IF CCP4IE CCP4IP OERR TRMT WUE Bit 0 RBIF TMR1IF TMR1IE TMR1IP CCP3IF CCP3IE CCP3IP RX9D TX9D ABDEN Reset Values on page 49 51 51 51 51 51 51 51 51 51 52 52 52
GIE/GIEH PEIE/GIEL PSPIF PSPIE PSPIP SSP2IF SSP2IE SSP2IP SPEN CSRC ABDOVF ADIF ADIE ADIP BCL2IF BCL2IE BCL2IP RX9 TX9 RCMT
EUSARTx Transmit Register
EUSARTx Baud Rate Generator Register High Byte EUSARTx Baud Rate Generator Register Low Byte
Legend: -- = unimplemented locations read as `0'. Shaded cells are not used for asynchronous transmission.
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19.2.2 EUSART ASYNCHRONOUS RECEIVER 19.2.3 SETTING UP 9-BIT MODE WITH ADDRESS DETECT
The receiver block diagram is shown in Figure 19-6. The data is received on the RXx pin and drives the data recovery block. The data recovery block is actually a high-speed shifter operating at x16 times the baud rate, whereas the main receive serial shifter operates at the bit rate or at FOSC. This mode would typically be used in RS-232 systems. To set up an Asynchronous Reception: Initialize the SPBRGHx:SPBRGx registers for the appropriate baud rate. Set or clear the BRGH and BRG16 bits, as required, to achieve the desired baud rate. 2. Enable the asynchronous serial port by clearing bit SYNC and setting bit SPEN. 3. If interrupts are desired, set enable bit RCxIE. 4. If 9-bit reception is desired, set bit RX9. 5. Enable the reception by setting bit CREN. 6. Flag bit, RCxIF, will be set when reception is complete and an interrupt will be generated if enable bit, RCxIE, was set. 7. Read the RCSTAx register to get the 9th bit (if enabled) and determine if any error occurred during reception. 8. Read the 8-bit received data by reading the RCREGx register. 9. If any error occurred, clear the error by clearing enable bit CREN. 10. If using interrupts, ensure that the GIE and PEIE bits in the INTCON register (INTCON<7:6>) are set. 1. This mode would typically be used in RS-485 systems. To set up an Asynchronous Reception with Address Detect Enable: Initialize the SPBRGHx:SPBRGx registers for the appropriate baud rate. Set or clear the BRGH and BRG16 bits, as required, to achieve the desired baud rate. 2. Enable the asynchronous serial port by clearing the SYNC bit and setting the SPEN bit. 3. If interrupts are required, set the RCEN bit and select the desired priority level with the RCxIP bit. 4. Set the RX9 bit to enable 9-bit reception. 5. Set the ADDEN bit to enable address detect. 6. Enable reception by setting the CREN bit. 7. The RCxIF bit will be set when reception is complete. The interrupt will be Acknowledged if the RCxIE and GIE bits are set. 8. Read the RCSTAx register to determine if any error occurred during reception, as well as read bit 9 of data (if applicable). 9. Read RCREGx to determine if the device is being addressed. 10. If any error occurred, clear the CREN bit. 11. If the device has been addressed, clear the ADDEN bit to allow all received data into the receive buffer and interrupt the CPU. 1.
FIGURE 19-6:
EUSART RECEIVE BLOCK DIAGRAM
CREN x64 Baud Rate CLK OERR FERR
BRG16
SPBRGHx
SPBRGx
Baud Rate Generator
/ 64 or / 16 or /4
MSb Stop (8) 7
RSR Register *** 1 0
LSb Start
RX9 Pin Buffer and Control RXx
Data Recovery RX9D RCREGx Register FIFO
SPEN 8 Interrupt RCxIF RCxIE Data Bus
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FIGURE 19-7:
RXx (pin) Rcv Shift Reg Rcv Buffer Reg Read Rcv Buffer Reg RCREGx RCxIF (Interrupt Flag) OERR bit CREN Word 1 RCREGx
ASYNCHRONOUS RECEPTION
Start bit bit 0 bit 1 bit 7/8 Stop bit Start bit bit 0 bit 7/8 Stop bit Start bit bit 7/8 Stop bit
Word 2 RCREGx
Note:
This timing diagram shows three words appearing on the RXx input. The RCREGx (Receive Buffer) is read after the third word causing the OERR (Overrun) bit to be set.
TABLE 19-6:
Name INTCON PIR1 PIE1 IPR1 PIR3 PIE3 IPR3 RCSTAx RCREGx TXSTAx SPBRGHx SPBRGx
REGISTERS ASSOCIATED WITH ASYNCHRONOUS RECEPTION
Bit 7 Bit 6 Bit 5 TMR0IE RC1IF RC1IE RC1IP RC2IF RC2IE RC2IP SREN TXEN -- Bit 4 INT0IE TX1IF TX1IE TX1IP TX2IF TX2IE TX2IP CREN SYNC SCKP Bit 3 RBIE SSP1IF SSP1IE SSP1IP TMR4IF TMR4IE TMR4IP ADDEN SENDB BRG16 Bit 2 TMR0IF CCP1IF CCP1IE CCP1IP CCP5IF CCP5IE CCP5IP FERR BRGH -- Bit 1 INT0IF TMR2IF TMR2IE TMR2IP CCP4IF CCP4IE CCP4IP OERR TRMT WUE Bit 0 RBIF TMR1IF TMR1IE TMR1IP CCP3IF CCP3IE CCP3IP RX9D TX9D ABDEN Reset Values on page 49 51 51 51 51 51 51 51 51 51 52 52 52
GIE/GIEH PEIE/GIEL PSPIF PSPIE PSPIP SSP2IF SSP2IE SSP2IP SPEN CSRC ADIF ADIE ADIP BCL2IF BCL2IE BCL2IP RX9 TX9 RCMT
EUSARTx Receive Register
BAUDCONx ABDOVF
EUSARTx Baud Rate Generator Register High Byte EUSARTx Baud Rate Generator Register Low Byte
Legend: -- = unimplemented locations read as `0'. Shaded cells are not used for asynchronous reception.
19.2.4
AUTO-WAKE-UP ON SYNC BREAK CHARACTER
During Sleep mode, all clocks to the EUSART are suspended. Because of this, the Baud Rate Generator is inactive and a proper byte reception cannot be performed. The auto-wake-up feature allows the controller to wake-up due to activity on the RXx/DTx line while the EUSART is operating in Asynchronous mode. The auto-wake-up feature is enabled by setting the WUE bit (BAUDCONx<1>). Once set, the typical receive sequence on RXx/DTx is disabled and the EUSART remains in an Idle state, monitoring for a wake-up event independent of the CPU mode. A wake-up event consists of a high-to-low transition on
the RXx/DTx line. (This coincides with the start of a Sync Break or a Wake-up Signal character for the LIN protocol.) Following a wake-up event, the module generates an RCxIF interrupt. The interrupt is generated synchronously to the Q clocks in normal operating modes (Figure 19-8) and asynchronously if the device is in Sleep mode (Figure 19-9). The interrupt condition is cleared by reading the RCREGx register. The WUE bit is automatically cleared once a low-to-high transition is observed on the RXx line following the wake-up event. At this point, the EUSART module is in Idle mode and returns to normal operation. This signals to the user that the Sync Break event is over.
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19.2.4.1 Special Considerations Using Auto-Wake-up 19.2.4.2 Special Considerations Using the WUE Bit
Since auto-wake-up functions by sensing rising edge transitions on RXx/DTx, information with any state changes before the Stop bit may signal a false end-of-character and cause data or framing errors. To work properly, therefore, the initial character in the transmission must be all `0's. This can be 00h (8 bytes) for standard RS-232 devices or 000h (12 bits) for LIN bus. Oscillator start-up time must also be considered, especially in applications using oscillators with longer start-up intervals (i.e., HS or HSPLL mode). The Sync Break (or Wake-up Signal) character must be of sufficient length and be followed by a sufficient interval to allow enough time for the selected oscillator to start and provide proper initialization of the EUSART. The timing of WUE and RCxIF events may cause some confusion when it comes to determining the validity of received data. As noted, setting the WUE bit places the EUSART in an Idle mode. The wake-up event causes a receive interrupt by setting the RCxIF bit. The WUE bit is cleared after this when a rising edge is seen on RXx/DTx. The interrupt condition is then cleared by reading the RCREGx register. Ordinarily, the data in RCREGx will be dummy data and should be discarded. The fact that the WUE bit has been cleared (or is still set) and the RCxIF flag is set should not be used as an indicator of the integrity of the data in RCREGx. Users should consider implementing a parallel method in firmware to verify received data integrity. To assure that no actual data is lost, check the RCMT bit to verify that a receive operation is not in process. If a receive operation is not occurring, the WUE bit may then be set just prior to entering the Sleep mode.
FIGURE 19-8:
OSC1
AUTO-WAKE-UP BIT (WUE) TIMINGS DURING NORMAL OPERATION
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
Bit set by user WUE bit(1) RXx/DTx Line RCxIF
Auto-Cleared
Cleared due to user read of RCREGx
Note 1:
The EUSART remains in Idle while the WUE bit is set.
FIGURE 19-9:
OSC1
AUTO-WAKE-UP BIT (WUE) TIMINGS DURING SLEEP
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
Bit set by user WUE bit(2) RXx/DTx Line RCxIF SLEEP Command Executed Note 1: 2: Sleep Ends Note 1
Auto-Cleared
Cleared due to user read of RCREGx
If the wake-up event requires long oscillator warm-up time, the auto-clear of the WUE bit can occur before the oscillator is ready. This sequence should not depend on the presence of Q clocks. The EUSART remains in Idle while the WUE bit is set.
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19.2.5 BREAK CHARACTER SEQUENCE
The EUSART module has the capability of sending the special Break character sequences that are required by the LIN bus standard. The Break character transmit consists of a Start bit, followed by twelve `0' bits and a Stop bit. The Frame Break character is sent whenever the SENDB and TXEN bits (TXSTAx<3> and TXSTAx<5>) are set while the Transmit Shift Register is loaded with data. Note that the value of data written to TXREGx will be ignored and all `0's will be transmitted. The SENDB bit is automatically reset by hardware after the corresponding Stop bit is sent. This allows the user to preload the transmit FIFO with the next transmit byte following the Break character (typically, the Sync character in the LIN specification). Note that the data value written to the TXREGx for the Break character is ignored. The write simply serves the purpose of initiating the proper sequence. The TRMT bit indicates when the transmit operation is active or Idle, just as it does during normal transmission. See Figure 19-10 for the timing of the Break character sequence. 1. 2. 3. 4. 5. Configure the EUSART for the desired mode. Set the TXEN and SENDB bits to set up the Break character. Load the TXREGx with a dummy character to initiate transmission (the value is ignored). Write `55h' to TXREGx to load the Sync character into the transmit FIFO buffer. After the Break has been sent, the SENDB bit is reset by hardware. The Sync character now transmits in the preconfigured mode.
When the TXREGx becomes empty, as indicated by the TXxIF, the next data byte can be written to TXREGx.
19.2.6
RECEIVING A BREAK CHARACTER
The Enhanced USART module can receive a Break character in two ways. The first method forces configuration of the baud rate at a frequency of 9/13 the typical speed. This allows for the Stop bit transition to be at the correct sampling location (13 bits for Break versus Start bit and 8 data bits for typical data). The second method uses the auto-wake-up feature described in Section 19.2.4 "Auto-Wake-up on Sync Break Character". By enabling this feature, the EUSART will sample the next two transitions on RXx/DTx, cause an RCxIF interrupt and receive the next data byte followed by another interrupt. Note that following a Break character, the user will typically want to enable the Auto-Baud Rate Detect feature. For both methods, the user can set the ABDEN bit once the TXxIF interrupt is observed.
19.2.5.1
Break and Sync Transmit Sequence
The following sequence will send a message frame header made up of a Break, followed by an Auto-Baud Sync byte. This sequence is typical of a LIN bus master.
FIGURE 19-10:
Write to TXREGx BRG Output (Shift Clock) TXx (pin)
SEND BREAK CHARACTER SEQUENCE
Dummy Write
Start Bit
Bit 0
Bit 1 Break
Bit 11
Stop Bit
TXxIF bit (Transmit Buffer Reg. Empty Flag) TRMT bit (Transmit Shift Reg. Empty Flag) SENDB sampled here SENDB bit (Transmit Shift Reg. Empty Flag) Auto-Cleared
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19.3 EUSART Synchronous Master Mode
Once the TXREGx register transfers the data to the TSR register (occurs in one TCY), the TXREGx is empty and the TX1IF flag bit (PIR1<4>) is set. The interrupt can be enabled or disabled by setting or clearing the interrupt enable bit, TX1IE (PIE1<4>). TX1IF is set regardless of the state of enable bit TX1IE; it cannot be cleared in software. It will reset only when new data is loaded into the TXREGx register. While flag bit TX1IF indicates the status of the TXREGx register, another bit, TRMT (TXSTAx<1>), shows the status of the TSR register. TRMT is a read-only bit which is set when the TSR is empty. No interrupt logic is tied to this bit, so the user must poll this bit in order to determine if the TSR register is empty. The TSR is not mapped in data memory so it is not available to the user. To set up a Synchronous Master Transmission: 1. Initialize the SPBRGHx:SPBRGx registers for the appropriate baud rate. Set or clear the BRG16 bit, as required, to achieve the desired baud rate. Enable the synchronous master serial port by setting bits SYNC, SPEN and CSRC. If interrupts are desired, set enable bit TXxIE. If 9-bit transmission is desired, set bit TX9. Enable the transmission by setting bit TXEN. If 9-bit transmission is selected, the ninth bit should be loaded in bit TX9D. Start transmission by loading data to the TXREGx register. If using interrupts, ensure that the GIE and PEIE bits in the INTCON register (INTCON<7:6>) are set.
The Synchronous Master mode is entered by setting the CSRC bit (TXSTAx<7>). In this mode, the data is transmitted in a half-duplex manner (i.e., transmission and reception do not occur at the same time). When transmitting data, the reception is inhibited and vice versa. Synchronous mode is entered by setting bit SYNC (TXSTAx<4>). In addition, enable bit SPEN (RCSTAx<7>) is set in order to configure the TXx and RXx pins to CKx (clock) and DTx (data) lines, respectively. The Master mode indicates that the processor transmits the master clock on the CKx line. Clock polarity is selected with the SCKP bit (BAUDCONx<4>); setting SCKP sets the Idle state on CKx as high, while clearing the bit sets the Idle state as low. This option is provided to support Microwire devices with this module.
19.3.1
EUSART SYNCHRONOUS MASTER TRANSMISSION
2. 3. 4. 5. 6. 7. 8.
The EUSART transmitter block diagram is shown in Figure 19-3. The heart of the transmitter is the Transmit (Serial) Shift Register (TSR). The Shift register obtains its data from the Read/Write Transmit Buffer register, TXREGx. The TXREGx register is loaded with data in software. The TSR register is not loaded until the last bit has been transmitted from the previous load. As soon as the last bit is transmitted, the TSR is loaded with new data from the TXREGx (if available).
FIGURE 19-11:
SYNCHRONOUS TRANSMISSION
Q3 Q4 Q1 Q2 Q3 Q4 Q1Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
Q1 Q2 Q3Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1Q2 Q3 Q4 Q1 Q2 Q3 Q4
RC7/RX1/DT1 RC6/TX1/CK1 pin (SCKP = 0) RC6/TX1/CK1 pin (SCKP = 1) Write to TXREG1 Reg TX1IF bit (Interrupt Flag) TRMT bit TXEN bit Note: `1'
bit 0
bit 1
bit 2
bit 7
bit 0
bit 1
bit 7
Word 1
Word 2
Write Word 1
Write Word 2
`1'
Sync Master mode, SPBRGx = 0, continuous transmission of two 8-bit words. This example is equally applicable to EUSART2 (RG1/TX2/CK2 and RG2/RX2/DT2).
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FIGURE 19-12: SYNCHRONOUS TRANSMISSION (THROUGH TXEN)
bit 0 bit 1 bit 2 bit 6 bit 7 RC7/RX1/DT1 pin
RC6/TX1/CK1 pin Write to TXREG1 reg
TX1IF bit
TRMT bit
TXEN bit Note: This example is equally applicable to EUSART2 (RG1/TX2/CK2 and RG2/RX2/DT2).
TABLE 19-7:
Name INTCON PIR1 PIE1 IPR1 PIR3 PIE3 IPR3 RCSTAx TXREGx TXSTAx SPBRGHx SPBRGx
REGISTERS ASSOCIATED WITH SYNCHRONOUS MASTER TRANSMISSION
Bit 7 Bit 6 Bit 5 Bit 4 INT0IE TX1IF TX1IE TX1IP TX2IF TX2IE TX2IP CREN SYNC SCKP Bit 3 RBIE SSP1IF SSP1IE SSP1IP TMR4IF TMR4IE TMR4IP ADDEN SENDB BRG16 Bit 2 TMR0IF CCP1IF CCP1IE CCP1IP CCP5IF CCP5IE CCP5IP FERR BRGH -- Bit 1 INT0IF TMR2IF TMR2IE TMR2IP CCP4IF CCP4IE CCP4IP OERR TRMT WUE Bit 0 RBIF TMR1IF TMR1IE TMR1IP CCP3IF CCP3IE CCP3IP RX9D TX9D ABDEN Reset Values on page 49 51 51 51 51 51 51 51 51 51 52 52 52
GIE/GIEH PEIE/GIEL TMR0IE PSPIF PSPIE PSPIP SSP2IF SSP2IE SSP2IP SPEN CSRC ADIF ADIE ADIP BCL2IF BCL2IE BCL2IP RX9 TX9 RCMT RC1IF RC1IE RC1IP RC2IF RC2IE RC2IP SREN TXEN --
EUSARTx Transmit Register
BAUDCONx ABDOVF
EUSARTx Baud Rate Generator Register High Byte EUSARTx Baud Rate Generator Register Low Byte
Legend: -- = unimplemented, read as `0'. Shaded cells are not used for synchronous master transmission.
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19.3.2 EUSART SYNCHRONOUS MASTER RECEPTION
Once Synchronous mode is selected, reception is enabled by setting either the Single Receive Enable bit, SREN (RCSTAx<5>) or the Continuous Receive Enable bit, CREN (RCSTAx<4>). Data is sampled on the RXx pin on the falling edge of the clock. If enable bit SREN is set, only a single word is received. If enable bit CREN is set, the reception is continuous until CREN is cleared. If both bits are set, then CREN takes precedence. To set up a Synchronous Master Reception: 1. Initialize the SPBRGHx:SPBRGx registers for the appropriate baud rate. Set or clear the BRG16 bit, as required, to achieve the desired baud rate. Enable the synchronous master serial port by setting bits SYNC, SPEN and CSRC. Ensure bits CREN and SREN are clear. 4. 5. 6. If interrupts are desired, set enable bit RCxIE. If 9-bit reception is desired, set bit RX9. If a single reception is required, set bit SREN. For continuous reception, set bit CREN. 7. Interrupt flag bit, RCxIF, will be set when reception is complete and an interrupt will be generated if the enable bit, RCxIE, was set. 8. Read the RCSTAx register to get the 9th bit (if enabled) and determine if any error occurred during reception. 9. Read the 8-bit received data by reading the RCREGx register. 10. If any error occurred, clear the error by clearing bit CREN. 11. If using interrupts, ensure that the GIE and PEIE bits in the INTCON register (INTCON<7:6>) are set.
2. 3.
FIGURE 19-13:
SYNCHRONOUS RECEPTION (MASTER MODE, SREN)
Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
RC7/RX1/DT1 pin RC6/TX1/CK1 pin (SCKP = 0) RC6/TX1/CK1 pin (SCKP = 1) Write to bit SREN SREN bit CREN bit `0' RC1IF bit (Interrupt) Read RCREG1 Note:
bit 0
bit 1
bit 2
bit 3
bit 4
bit 5
bit 6
bit 7
`0'
Timing diagram demonstrates Sync Master mode with bit SREN = 1 and bit BRGH = 0. This example is equally applicable to EUSART2 (RG1/TX2/CK2 and RG2/RX2/DT2).
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TABLE 19-8:
Name INTCON PIR1 PIE1 IPR1 PIR3 PIE3 IPR3 RCSTAx RCREGx TXSTAx SPBRGHx SPBRGx
REGISTERS ASSOCIATED WITH SYNCHRONOUS MASTER RECEPTION
Bit 7 Bit 6 Bit 5 TMR0IE RC1IF RC1IE RC1IP RC2IF RC2IE RC2IP SREN TXEN -- Bit 4 INT0IE TX1IF TX1IE TX1IP TX2IF TX2IE TX2IP CREN SYNC SCKP Bit 3 RBIE SSP1IF SSP1IE SSP1IP TMR4IF TMR4IE TMR4IP ADDEN SENDB BRG16 Bit 2 TMR0IF CCP1IF CCP1IE CCP1IP CCP5IF CCP5IE CCP5IP FERR BRGH -- Bit 1 INT0IF TMR2IF TMR2IE TMR2IP CCP4IF CCP4IE CCP4IP OERR TRMT WUE Bit 0 RBIF TMR1IF TMR1IE TMR1IP CCP3IF CCP3IE CCP3IP RX9D TX9D ABDEN Reset Values on page 49 51 51 51 51 51 51 51 51 51 52 52 52
GIE/GIEH PEIE/GIEL PSPIF PSPIE PSPIP SSP2IF SSP2IE SSP2IP SPEN CSRC ADIF ADIE ADIP BCL2IF BCL2IE BCL2IP RX9 TX9 RCMT
EUSARTx Receive Register
BAUDCONx ABDOVF
EUSARTx Baud Rate Generator Register High Byte EUSARTx Baud Rate Generator Register Low Byte
Legend: -- = unimplemented, read as `0'. Shaded cells are not used for synchronous master reception.
19.4
EUSART Synchronous Slave Mode
To set up a Synchronous Slave Transmission: 1. Enable the synchronous slave serial port by setting bits SYNC and SPEN and clearing bit CSRC. Clear bits CREN and SREN. If interrupts are desired, set enable bit TXxIE. If 9-bit transmission is desired, set bit TX9. Enable the transmission by setting enable bit TXEN. If 9-bit transmission is selected, the ninth bit should be loaded in bit TX9D. Start transmission by loading data to the TXREGx register. If using interrupts, ensure that the GIE and PEIE bits in the INTCON register (INTCON<7:6>) are set.
Synchronous Slave mode is entered by clearing bit, CSRC (TXSTAx<7>). This mode differs from the Synchronous Master mode in that the shift clock is supplied externally at the CKx pin (instead of being supplied internally in Master mode). This allows the device to transfer or receive data while in any low-power mode.
2. 3. 4. 5. 6. 7. 8.
19.4.1
EUSART SYNCHRONOUS SLAVE TRANSMISSION
The operation of the Synchronous Master and Slave modes is identical, except in the case of Sleep mode. If two words are written to the TXREGx and then the SLEEP instruction is executed, the following will occur: a) b) c) d) The first word will immediately transfer to the TSR register and transmit. The second word will remain in the TXREGx register. Flag bit, TXxIF, will not be set. When the first word has been shifted out of TSR, the TXREGx register will transfer the second word to the TSR and flag bit, TXxIF, will now be set. If enable bit TXxIE is set, the interrupt will wake the chip from Sleep. If the global interrupt is enabled, the program will branch to the interrupt vector.
e)
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TABLE 19-9:
Name INTCON PIR1 PIE1 IPR1 PIR3 PIE3 IPR3 RCSTAx TXREGx TXSTAx SPBRGHx SPBRGx
REGISTERS ASSOCIATED WITH SYNCHRONOUS SLAVE TRANSMISSION
Bit 7 Bit 6 Bit 5 Bit 4 INT0IE TX1IF TX1IE TX1IP TX2IF TX2IE TX2IP CREN SYNC SCKP Bit 3 RBIE SSP1IF SSP1IE SSP1IP TMR4IF TMR4IE TMR4IP ADDEN SENDB BRG16 Bit 2 TMR0IF CCP1IF CCP1IE CCP1IP CCP5IF CCP5IE CCP5IP FERR BRGH -- Bit 1 INT0IF TMR2IF TMR2IE TMR2IP CCP4IF CCP4IE CCP4IP OERR TRMT WUE Bit 0 RBIF TMR1IF TMR1IE TMR1IP CCP3IF CCP3IE CCP3IP RX9D TX9D ABDEN Reset Values on page 49 51 51 51 51 51 51 51 51 51 52 52 52
GIE/GIEH PEIE/GIEL TMR0IE PSPIF PSPIE PSPIP SSP2IF SSP2IE SSP2IP SPEN CSRC ADIF ADIE ADIP BCL2IF BCL2IE BCL2IP RX9 TX9 RCMT RC1IF RC1IE RC1IP RC2IF RC2IE RC2IP SREN TXEN --
EUSARTx Transmit Register
BAUDCONx ABDOVF
EUSARTx Baud Rate Generator Register High Byte EUSARTx Baud Rate Generator Register Low Byte
Legend: -- = unimplemented, read as `0'. Shaded cells are not used for synchronous slave transmission.
19.4.2
EUSART SYNCHRONOUS SLAVE RECEPTION
To set up a Synchronous Slave Reception: 1. Enable the synchronous master serial port by setting bits SYNC and SPEN and clearing bit CSRC. If interrupts are desired, set enable bit RCxIE. If 9-bit reception is desired, set bit RX9. To enable reception, set enable bit CREN. Flag bit, RCxIF, will be set when reception is complete. An interrupt will be generated if enable bit, RCxIE, was set. Read the RCSTAx register to get the 9th bit (if enabled) and determine if any error occurred during reception. Read the 8-bit received data by reading the RCREGx register. If any error occurred, clear the error by clearing bit CREN. If using interrupts, ensure that the GIE and PEIE bits in the INTCON register (INTCON<7:6>) are set.
The operation of the Synchronous Master and Slave modes is identical, except in the case of Sleep, or any Idle mode and bit SREN, which is a "don't care" in Slave mode. If receive is enabled by setting the CREN bit prior to entering Sleep or any Idle mode, then a word may be received while in this low-power mode. Once the word is received, the RSR register will transfer the data to the RCREGx register; if the RCxIE enable bit is set, the interrupt generated will wake the chip from the low-power mode. If the global interrupt is enabled, the program will branch to the interrupt vector.
2. 3. 4. 5.
6.
7. 8. 9.
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TABLE 19-10: REGISTERS ASSOCIATED WITH SYNCHRONOUS SLAVE RECEPTION
Name INTCON PIR1 PIE1 IPR1 PIR3 PIE3 IPR3 RCSTAx RCREGx TXSTAx SPBRGHx SPBRGx Bit 7 Bit 6 Bit 5 Bit 4 INT0IE TX1IF TX1IE TX1IP TX2IF TX2IE TX2IP CREN SYNC SCKP Bit 3 RBIE SSP1IF SSP1IE SSP1IP TMR4IF TMR4IE TMR4IP ADDEN SENDB BRG16 Bit 2 TMR0IF CCP1IF CCP1IE CCP1IP CCP5IF CCP5IE CCP5IP FERR BRGH -- Bit 1 INT0IF TMR2IF TMR2IE TMR2IP CCP4IF CCP4IE CCP4IP OERR TRMT WUE Bit 0 RBIF TMR1IF TMR1IE TMR1IP CCP3IF CCP3IE CCP3IP RX9D TX9D ABDEN Reset Values on page 49 51 51 51 51 51 51 51 51 51 52 52 52
GIE/GIEH PEIE/GIEL TMR0IE PSPIF PSPIE PSPIP SSP2IF SSP2IE SSP2IP SPEN CSRC ADIF ADIE ADIP BCL2IF BCL2IE BCL2IP RX9 TX9 RCMT RC1IF RC1IE RC1IP RC2IF RC2IE RC2IP SREN TXEN --
EUSARTx Receive Register
BAUDCONx ABDOVF
EUSARTx Baud Rate Generator Register High Byte EUSARTx Baud Rate Generator Register Low Byte
Legend: -- = unimplemented, read as `0'. Shaded cells are not used for synchronous slave reception.
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20.0 10-BIT ANALOG-TO-DIGITAL CONVERTER (A/D) MODULE
The module has five registers: * * * * * A/D Result High Register (ADRESH) A/D Result Low Register (ADRESL) A/D Control Register 0 (ADCON0) A/D Control Register 1 (ADCON1) A/D Control Register 2 (ADCON2)
The analog-to-digital (A/D) converter module has 11 inputs for the 64-pin devices and 15 for the 80-pin devices. This module allows conversion of an analog input signal to a corresponding 10-bit digital number.
The ADCON0 register, shown in Register 20-1, controls the operation of the A/D module. The ADCON1 register, shown in Register 20-2, configures the functions of the port pins. The ADCON2 register, shown in Register 20-3, configures the A/D clock source, programmed acquisition time and justification.
REGISTER 20-1:
ADCON0: A/D CONTROL REGISTER 0
R/W-0 ADCAL bit 7 U-0 -- R/W-0 CHS3 R/W-0 CHS2 R/W-0 CHS1 R/W-0 CHS0 R/W-0 GO/DONE R/W-0 ADON bit 0
bit 7-6
ADCAL: A/D Calibration bit 1 = Calibration is performed on next A/D conversion 0 = Normal A/D converter operation (no conversion is performed) Unimplemented: Read as `0' CHS3:CHS0: Analog Channel Select bits 0000 = Channel 00 (AN0) 0001 = Channel 01 (AN1) 0010 = Channel 02 (AN2) 0011 = Channel 03 (AN3) 0100 = Channel 04 (AN4) 0101 = Unused 0110 = Channel 06 (AN6) 0111 = Channel 07 (AN7) 1000 = Channel 08 (AN8) 1001 = Channel 09 (AN9) 1010 = Channel 10 (AN10) 1011 = Channel 11 (AN11) 1100 = Channel 12 (AN12)(1,2) 1101 = Channel 13 (AN13)(1,2) 1110 = Channel 14 (AN14)(1,2) 1111 = Channel 15 (AN15)(1,2) GO/DONE: A/D Conversion Status bit When ADON = 1: 1 = A/D conversion in progress 0 = A/D Idle ADON: A/D On bit 1 = A/D converter module is enabled 0 = A/D converter module is disabled Note 1: These channels are not implemented on 64-pin devices. 2: Performing a conversion on unimplemented channels will return random values. Legend: R = Readable bit -n = Value at POR W = Writable bit '1' = Bit is set U = Unimplemented bit, read as `0' '0' = Bit is cleared x = Bit is unknown
bit 6 bit 5-2
bit 1
bit 0
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REGISTER 20-2: ADCON1: A/D CONTROL REGISTER 1
U-0 -- bit 7 bit 7-6 bit 5 Unimplemented: Read as `0' VCFG1: Voltage Reference Configuration bit (VREF- source) 1 = VREF- (AN2) 0 = AVSS VCFG0: Voltage Reference Configuration bit (VREF+ source) 1 = VREF+ (AN3) 0 = AVDD PCFG3:PCFG0: A/D Port Configuration Control bits:
AN15(1) AN14(1) AN13(1) AN10 AN11 AN9 AN8 AN7 AN6 AN4 AN3 AN2 AN1 A A A A A A A A A A A A A A D D AN0 A A A A A A A A A A A A A A A D PCFG3: PCFG0 AN12(1)
U-0 --
R/W-0 VCFG1
R/W-0 VCFG0
R/W-0 PCFG3
R/W-0 PCFG2
R/W-0 PCFG1
R/W-0 PCFG0 bit 0
bit 4
bit 3-0
0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111
A D D D D D D D D D D D D D D D
A D D D D D D D D D D D D D D D
A A D D D D D D D D D D D D D D
A A A D D D D D D D D D D D D D
A A A A D D D D D D D D D D D D
A A A A A D D D D D D D D D D D
A A A A A A D D D D D D D D D D
A A A A A A A D D D D D D D D D
A A A A A A A A D D D D D D D D
A A A A A A A A A D D D D D D D
A A A A A A A A A A A D D D D D
A A A A A A A A A A A A D D D D
A A A A A A A A A A A A A D D D
A = Analog input
D = Digital I/O
Note 1: AN12 through AN15 are available only in 80-pin devices.
Legend: R = Readable bit -n = Value at POR W = Writable bit '1' = Bit is set U = Unimplemented bit, read as `0' '0' = Bit is cleared x = Bit is unknown
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REGISTER 20-3: ADCON2: A/D CONTROL REGISTER 2
R/W-0 ADFM bit 7 bit 7 ADFM: A/D Result Format Select bit 1 = Right justified 0 = Left justified Unimplemented: Read as `0' ACQT2:ACQT0: A/D Acquisition Time Select bits 111 = 20 TAD 110 = 16 TAD 101 = 12 TAD 100 = 8 TAD 011 = 6 TAD 010 = 4 TAD 001 = 2 TAD 000 = 0 TAD(1) ADCS2:ADCS0: A/D Conversion Clock Select bits 111 = FRC (clock derived from A/D RC oscillator)(1) 110 = FOSC/64 101 = FOSC/16 100 = FOSC/4 011 = FRC (clock derived from A/D RC oscillator)(1) 010 = FOSC/32 001 = FOSC/8 000 = FOSC/2 Note 1: If the A/D FRC clock source is selected, a delay of one TCY (instruction cycle) is added before the A/D clock starts. This allows the SLEEP instruction to be executed before starting a conversion. Legend: R = Readable bit -n = Value at POR W = Writable bit '1' = Bit is set U = Unimplemented bit, read as `0' '0' = Bit is cleared x = Bit is unknown U-0 -- R/W-0 ACQT2 R/W-0 ACQT1 R/W-0 ACQT0 R/W-0 ADCS2 R/W-0 ADCS1 R/W-0 ADCS0 bit 0
bit 6 bit 5-3
bit 2-0
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The analog reference voltage is software selectable to either the device's positive and negative supply voltage (AVDD and AVSS), or the voltage level on the RA3/AN3/VREF+ and RA2/AN2/VREF- pins. The A/D converter has a unique feature of being able to operate while the device is in Sleep mode. To operate in Sleep, the A/D conversion clock must be derived from the A/D's internal RC oscillator. The output of the sample and hold is the input into the converter, which generates the result via successive approximation. Each port pin associated with the A/D converter can be configured as an analog input or as a digital I/O. The ADRESH and ADRESL registers contain the result of the A/D conversion. When the A/D conversion is complete, the result is loaded into the ADRESH:ADRESL register pair, the GO/DONE bit (ADCON0<1>) is cleared and A/D Interrupt Flag bit ADIF is set. A device Reset forces all registers to their Reset state. This forces the A/D module to be turned off and any conversion in progress is aborted. The value in the ADRESH:ADRESL register pair is not modified for a Power-on Reset. These registers will contain unknown data after a Power-on Reset. The block diagram of the A/D module is shown in Figure 20-1.
FIGURE 20-1:
A/D BLOCK DIAGRAM
CHS3:CHS0 1111 1110 1101 1100 1011 1010 1001 1000 0111 0110 0100 VAIN AN15(1) AN14(1) AN13(1) AN12(1) AN11 AN10 AN9 AN8 AN7 AN6 AN4 AN3 AN2 AN1 AN0
10-bit Converter A/D
(Input Voltage)
0011 0010 0001 0000 VDD
VCFG1:VCFG0
Reference Voltage
VREF+ VREFVSS
Note 1: Channels AN15 through AN12 are not available on 64-pin devices. 2: I/O pins have diode protection to VDD and VSS.
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After the A/D module has been configured as desired, the selected channel must be acquired before the conversion is started. The analog input channels must have their corresponding TRIS bits selected as an input. To determine acquisition time, see Section 20.1 "A/D Acquisition Requirements". After this acquisition time has elapsed, the A/D conversion can be started. An acquisition time can be programmed to occur between setting the GO/DONE bit and the actual start of the conversion. The following steps should be followed to do an A/D conversion: 1. Configure the A/D module: * Configure analog pins, voltage reference and digital I/O (ADCON1) * Select A/D input channel (ADCON0) * Select A/D acquisition time (ADCON2) * Select A/D conversion clock (ADCON2) * Turn on A/D module (ADCON0) Configure A/D interrupt (if desired): * Clear ADIF bit * Set ADIE bit * Set GIE bit 3. 4. 5. Wait the required acquisition time (if required). Start conversion: * Set GO/DONE bit (ADCON0<1>) Wait for A/D conversion to complete, by either: * Polling for the GO/DONE bit to be cleared OR 6. 7. * Waiting for the A/D interrupt Read A/D Result registers (ADRESH:ADRESL); clear bit ADIF, if required. For next conversion, go to step 1 or step 2, as required. The A/D conversion time per bit is defined as TAD. A minimum wait of 2 TAD is required before next acquisition starts.
2.
FIGURE 20-2:
ANALOG INPUT MODEL
VDD VT = 0.6V RS ANx RIC 1k Sampling Switch SS RSS
VAIN
CPIN 5 pF
VT = 0.6V
ILEAKAGE 100 nA
CHOLD = 25 pF
VSS
Legend: CPIN = input capacitance VT = threshold voltage ILEAKAGE = leakage current at the pin due to various junctions RIC = interconnect resistance SS = sampling switch CHOLD = sample/hold capacitance (from DAC) RSS = sampling switch resistance
6V 5V VDD 4V 3V 2V
1 2 3 4 Sampling Switch (k)
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20.1 A/D Acquisition Requirements
For the A/D converter to meet its specified accuracy, the charge holding capacitor (CHOLD) must be allowed to fully charge to the input channel voltage level. The analog input model is shown in Figure 20-2. The source impedance (RS) and the internal sampling switch (RSS) impedance directly affect the time required to charge the capacitor CHOLD. The sampling switch (RSS) impedance varies over the device voltage (VDD). The source impedance affects the offset voltage at the analog input (due to pin leakage current). The maximum recommended impedance for analog sources is 2.5 k. After the analog input channel is selected (changed), the channel must be sampled for at least the minimum acquisition time before starting a conversion. Note: When the conversion is started, the holding capacitor is disconnected from the input pin. To calculate the minimum acquisition time, Equation 20-1 may be used. This equation assumes that 1/2 LSb error is used (1024 steps for the A/D). The 1/2 LSb error is the maximum error allowed for the A/D to meet its specified resolution. Equation 20-3 shows the calculation of the minimum required acquisition time, TACQ. This calculation is based on the following application system assumptions: CHOLD Rs Conversion Error VDD Temperature = = = = 25 pF 2.5 k 1/2 LSb 5V Rss = 2 k 85C (system max.)
EQUATION 20-1:
TACQ = =
ACQUISITION TIME
Amplifier Settling Time + Holding Capacitor Charging Time + Temperature Coefficient TAMP + TC + TCOFF
EQUATION 20-2:
VHOLD or TC = =
A/D MINIMUM CHARGING TIME
(VREF - (VREF/2048)) * (1 - e(-TC/CHOLD(RIC + RSS + RS))) -(CHOLD)(RIC + RSS + RS) ln(1/2048)
EQUATION 20-3:
TACQ TAMP TCOFF = = = 0.2 s
CALCULATING THE MINIMUM REQUIRED ACQUISITION TIME
TAMP + TC + TCOFF (Temp - 25C)(0.02 s/C) (85C - 25C)(0.02 s/C) 1.2 s -(CHOLD)(RIC + RSS + RS) ln(1/2047) s -(25 pF) (1 k + 2 k + 2.5 k) ln(0.0004883) s 1.05 s 0.2 s + 1 s + 1.2 s 2.4 s
Temperature coefficient is only required for temperatures > 25C. Below 25C, TCOFF = 0 ms. TC =
TACQ
=
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20.2 Selecting and Configuring Automatic Acquisition Time
TABLE 20-1: TAD vs. DEVICE OPERATING FREQUENCIES
Maximum Device Frequency 1.25 MHz 2.50 MHz 5.00 MHz 10.0 MHz 20.0 MHz 40.0 MHz 1.00 MHz(1) AD Clock Source (TAD) Operation 2 TOSC 4 TOSC 8 TOSC 16 TOSC 32 TOSC 64 TOSC RC
(3)
The ADCON2 register allows the user to select an acquisition time that occurs each time the GO/DONE bit is set. When the GO/DONE bit is set, sampling is stopped and a conversion begins. The user is responsible for ensuring the required acquisition time has passed between selecting the desired input channel and setting the GO/DONE bit. This occurs when the ACQT2:ACQT0 bits (ADCON2<5:3>) remain in their Reset state (`000') and is compatible with devices that do not offer programmable acquisition times. If desired, the ACQT bits can be set to select a programmable acquisition time for the A/D module. When the GO/DONE bit is set, the A/D module continues to sample the input for the selected acquisition time, then automatically begins a conversion. Since the acquisition time is programmed, there may be no need to wait for an acquisition time between selecting a channel and setting the GO/DONE bit. In either case, when the conversion is completed, the GO/DONE bit is cleared, the ADIF flag is set and the A/D begins sampling the currently selected channel again. If an acquisition time is programmed, there is nothing to indicate if the acquisition time has ended or if the conversion has begun.
ADCS2:ADCS0 000 100 001 101 010 110 x11
Note 1: The RC source has a typical TAD time of 4 ms. 2: The RC source has a typical TAD time of 6 ms. 3: For device frequencies above 1 MHz, the device must be in Sleep mode for the entire conversion or the A/D accuracy may be out of specification.
20.4
Configuring Analog Port Pins
20.3
Selecting the A/D Conversion Clock
The ADCON1, TRISA, TRISF and TRISH registers control the operation of the A/D port pins. The port pins needed as analog inputs must have their corresponding TRIS bits set (input). If the TRIS bit is cleared (output), the digital output level (VOH or VOL) will be converted. The A/D operation is independent of the state of the CHS3:CHS0 bits and the TRIS bits. Note 1: When reading the port register, all pins configured as analog input channels will read as cleared (a low level). Pins configured as digital inputs will convert an analog input. Analog levels on a digitally configured input will be accurately converted. 2: Analog levels on any pin defined as a digital input may cause the digital input buffer to consume current out of the device's specification limits.
The A/D conversion time per bit is defined as TAD. The A/D conversion requires 11 TAD per 10-bit conversion. The source of the A/D conversion clock is software selectable. There are seven possible options for TAD: * * * * * * * 2 TOSC 4 TOSC 8 TOSC 16 TOSC 32 TOSC 64 TOSC Internal RC Oscillator
For correct A/D conversions, the A/D conversion clock (TAD) must be as short as possible but greater than the minimum TAD (approximately 2 s, see parameter 130 for more information). Table 20-1 shows the resultant TAD times derived from the device operating frequencies and the A/D clock source selected.
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20.5 A/D Conversions 20.6 Use of the ECCP2 Trigger
Figure 20-3 shows the operation of the A/D converter after the GO/DONE bit has been set and the ACQT2:ACQT0 bits are cleared. A conversion is started after the following instruction to allow entry into Sleep mode before the conversion begins. Figure 20-4 shows the operation of the A/D converter after the GO/DONE bit has been set, the ACQT2:ACQT0 bits are set to `010' and selecting a 4 TAD acquisition time before the conversion starts. Clearing the GO/DONE bit during a conversion will abort the current conversion. The A/D Result register pair will NOT be updated with the partially completed A/D conversion sample. This means the ADRESH:ADRESL registers will continue to contain the value of the last completed conversion (or the last value written to the ADRESH:ADRESL registers). After the A/D conversion is completed or aborted, a 2 TAD wait is required before the next acquisition can be started. After this wait, acquisition on the selected channel is automatically started. Note: The GO/DONE bit should NOT be set in the same instruction that turns on the A/D. An A/D conversion can be started by the "Special Event Trigger" of the ECCP2 module. This requires that the CCP2M3:CCP2M0 bits (CCP2CON<3:0>) be programmed as `1011' and that the A/D module is enabled (ADON bit is set). When the trigger occurs, the GO/DONE bit will be set, starting the A/D acquisition and conversion and the Timer1 (or Timer3) counter will be reset to zero. Timer1 (or Timer3) is reset to automatically repeat the A/D acquisition period with minimal software overhead (moving ADRESH/ADRESL to the desired location). The appropriate analog input channel must be selected and the minimum acquisition period is either timed by the user, or an appropriate TACQ time is selected before the Special Event Trigger sets the GO/DONE bit (starts a conversion). If the A/D module is not enabled (ADON is cleared), the Special Event Trigger will be ignored by the A/D module but will still reset the Timer1 (or Timer3) counter.
FIGURE 20-3:
A/D CONVERSION TAD CYCLES (ACQT2:ACQT0 = 000, TACQ = 0)
TCY - TAD TAD1 TAD2 TAD3 TAD4 TAD5 TAD6 TAD7 TAD8 TAD9 TAD10 TAD11 b4 b1 b0 b6 b7 b2 b9 b8 b3 b5 Conversion starts Holding capacitor is disconnected from analog input (typically 100 ns) Set GO/DONE bit Next Q4: ADRESH/ADRESL is loaded, GO/DONE bit is cleared, ADIF bit is set, holding capacitor is connected to analog input.
FIGURE 20-4:
A/D CONVERSION TAD CYCLES (ACQT2:ACQT0 = 010, TACQ = 4 TAD)
TACQT Cycles 1 2 3 4 1 2 b9 Automatic Acquisition Time 3 b8 4 b7
TAD Cycles 5 b6 6 b5 7 b4 8 b3 9 b2 10 b1 11 b0
Conversion starts (Holding capacitor is disconnected)
Set GO/DONE bit (Holding capacitor continues acquiring input)
Next Q4: ADRESH:ADRESL is loaded, GO/DONE bit is cleared, ADIF bit is set, holding capacitor is reconnected to analog input.
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20.7 A/D Converter Calibration
The A/D converter in the PIC18F87J10 family of devices includes a self-calibration feature which compensates for any offset generated within the module. The calibration process is automated and is initiated by setting the ADCAL bit (ADCON0<7>). The next time the GO/DONE bit is set, the module will perform a "dummy" conversion (that is, with reading none of the input channels) and store the resulting value internally to compensate for offset. Thus, subsequent offsets will be compensated. The calibration process assumes that the device is in a relatively steady-state operating condition. If A/D calibration is used, it should be performed after each device Reset or if there are other major changes in operating conditions. If the A/D is expected to operate while the device is in a power-managed mode, the ACQT2:ACQT0 and ADCS2:ADCS0 bits in ADCON2 should be updated in accordance with the power-managed mode clock that will be used. After the power-managed mode is entered (either of the power-managed Run modes), an A/D acquisition or conversion may be started. Once an acquisition or conversion is started, the device should continue to be clocked by the same power-managed mode clock source until the conversion has been completed. If desired, the device may be placed into the corresponding power-managed Idle mode during the conversion. If the power-managed mode clock frequency is less than 1 MHz, the A/D RC clock source should be selected. Operation in the Sleep mode requires the A/D RC clock to be selected. If bits ACQT2:ACQT0 are set to `000' and a conversion is started, the conversion will be delayed one instruction cycle to allow execution of the SLEEP instruction and entry to Sleep mode. The IDLEN and SCS bits in the OSCCON register must have already been cleared prior to starting the conversion.
20.8
Operation in Power-Managed Modes
The selection of the automatic acquisition time and A/D conversion clock is determined in part by the clock source and frequency while in a power-managed mode.
TABLE 20-2:
Name INTCON PIR1 PIE1 IPR1 PIR2 PIE2 IPR2 ADRESH ADRESL ADCON0 ADCON1 ADCON2 CCP2CON PORTA TRISA PORTF TRISF PORTH(1) TRISH(1)
SUMMARY OF A/D REGISTERS
Bit 7 Bit 6 Bit 5 TMR0IE RC1IF RC1IE RC1IP -- -- -- Bit 4 INT0IE TX1IF TX1IE TX1IP -- -- -- Bit 3 RBIE SSP1IF SSP1IE SSP1IP BCL1IF BCL1IE BCL1IP Bit 2 TMR0IF CCP1IF CCP1IE CCP1IP -- -- -- Bit 1 INT0IF TMR2IF TMR2IE TMR2IP TMR3IF TMR3IE TMR3IP Bit 0 RBIF TMR1IF TMR1IE TMR1IP CCP2IF CCP2IE CCP2IP Reset Values on page 49 51 51 51 51 51 51 50 50 CHS3 VCFG0 ACQT1 DC2B0 RA4 TRISA4 RF4 TRISF4 RH4 TRISH4 CHS1 PCFG3 ACQT0 CCP2M3 RA3 TRISA3 RF3 TRISF3 RH3 TRISH3 CHS0 PCFG2 ADCS2 CCP2M2 RA2 TRISA2 RF2 TRISF2 RH2 TRISH2 GO/DONE PCFG1 ADCS1 CCP2M1 RA1 TRISA1 RF1 TRISF1 RH1 TRISH1 ADON PCFG0 ADCS0 CCP2M0 RA0 TRISA0 -- -- RH0 TRISH0 50 50 50 51 52 52 52 52 52 52
GIE/GIEH PEIE/GIEL PSPIF PSPIE PSPIP OSCFIF OSCFIE OSCFIP ADIF ADIE ADIP CMIF CMIE CMIP
A/D Result Register High Byte A/D Result Register Low Byte ADCAL -- ADFM P2M1 -- -- RF7 TRISF5 RH7 TRISH7 -- -- -- P2M0 -- -- RF6 TRISF4 RH6 TRISH6 CHS3 VCFG1 ACQT2 DC2B1 RA5 TRISA5 RF5 TRISF5 RH5 TRISH5
Legend: -- = unimplemented, read as `0'. Shaded cells are not used for A/D conversion. Note 1: This register is not implemented on 64-pin devices.
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21.0 COMPARATOR MODULE
The analog comparator module contains two comparators that can be configured in a variety of ways. The inputs can be selected from the analog inputs multiplexed with pins RF1 through RF6, as well as the on-chip voltage reference (see Section 22.0 "Comparator Voltage Reference Module"). The digital outputs (normal or inverted) are available at the pin level and can also be read through the control register. The CMCON register (Register 21-1) selects the comparator input and output configuration. Block diagrams of the various comparator configurations are shown in Figure 21-1.
REGISTER 21-1:
CMCON: COMPARATOR MODULE CONTROL REGISTER
R-0 C2OUT bit 7 R-0 C1OUT R/W-0 C2INV R/W-0 C1INV R/W-0 CIS R/W-1 CM2 R/W-1 CM1 R/W-1 CM0 bit 0
bit 7
C2OUT: Comparator 2 Output bit When C2INV = 0: 1 = C2 VIN+ > C2 VIN0 = C2 VIN+ < C2 VINWhen C2INV = 1: 1 = C2 VIN+ < C2 VIN0 = C2 VIN+ > C2 VINC1OUT: Comparator 1 Output bit When C1INV = 0: 1 = C1 VIN+ > C1 VIN0 = C1 VIN+ < C1 VINWhen C1INV = 1: 1 = C1 VIN+ < C1 VIN0 = C1 VIN+ > C1 VINC2INV: Comparator 2 Output Inversion bit 1 = C2 output inverted 0 = C2 output not inverted C1INV: Comparator 1 Output Inversion bit 1 = C1 output inverted 0 = C1 output not inverted CIS: Comparator Input Switch bit When CM2:CM0 = 110: 1 = C1 VIN- connects to RF5/AN10/CVREF C2 VIN- connects to RF3/AN8 0 = C1 VIN- connects to RF6/AN11 C2 VIN- connects to RF4/AN9 CM2:CM0: Comparator Mode bits Figure 21-1 shows the Comparator modes and the CM2:CM0 bit settings. Legend: R = Readable bit -n = Value at POR W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown
bit 6
bit 5
bit 4
bit 3
bit 2-0
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21.1 Comparator Configuration
There are eight modes of operation for the comparators, shown in Figure 21-1. Bits CM2:CM0 of the CMCON register are used to select these modes. The TRISF register controls the data direction of the comparator pins for each mode. If the Comparator mode is changed, the comparator output level may not be valid for the specified mode change delay shown in Section 26.0 "Electrical Characteristics". Note: Comparator interrupts should be disabled during a Comparator mode change; otherwise, a false interrupt may occur.
FIGURE 21-1:
COMPARATOR I/O OPERATING MODES
Comparators Off (POR Default Value) CM2:CM0 = 111 RF6/AN11 C1 Off (Read as `0') RF5/AN10/ CVREF RF4/AN9 C2 Off (Read as `0') RF3/AN8
D D VINVIN+
Comparator Outputs Disabled CM2:CM0 = 000 RF6/AN11
A VINVIN+
RF5/AN10/ A CVREF RF4/AN9 RF3/AN8
A A
C1
Off (Read as `0')
VINVIN+
D D
VINVIN+
C2
Off (Read as `0')
Two Independent Comparators CM2:CM0 = 010 RF6/AN11
A VINVIN+
Two Independent Comparators with Outputs CM2:CM0 = 011 RF6/AN11
A VIN-
RF5/AN10/ A CVREF RF4/AN9 RF3/AN8
A A
C1
C1OUT
VIN+ RF5/AN10/ A CVREF RF2/AN7/C1OUT*
C1
C1OUT
VINVIN+
C2
C2OUT
RF4/AN9 RF3/AN8
A A
VINVIN+
C2
C2OUT
RF1/AN6/C2OUT* Two Common Reference Comparators CM2:CM0 = 100 RF6/AN11
A VINVIN+
Two Common Reference Comparators with Outputs CM2:CM0 = 101 RF6/AN11
A VINVIN+
RF5/AN10/ A CVREF RF4/AN9 RF3/AN8
A D
C1
C1OUT
A RF5/AN10/ CVREF RF2/AN7/C1OUT*
C1
C1OUT
VINVIN+
C2
C2OUT
RF4/AN9 RF3/AN8
A D
VINVIN+
C2
C2OUT
RF1/AN6/C2OUT* One Independent Comparator with Output CM2:CM0 = 001 RF6/AN11
A VINVIN+
Four Inputs Multiplexed to Two Comparators CM2:CM0 = 110 RF6/AN11
A A CIS = 0 CIS = 1 VINVIN+ A A CIS = 0 CIS = 1 VINVIN+
RF5/AN10/ A CVREF RF2/AN7/C1OUT* RF4/AN9 RF3/AN8
D D
C1
C1OUT
RF5/AN10/ CVREF RF4/AN9
C1
C1OUT
VINVIN+
RF3/AN8 C2 Off (Read as `0')
C2
C2OUT
CVREF
From VREF module
A = Analog Input, port reads zeros always D = Digital Input CIS (CMCON<3>) is the Comparator Input Switch * Setting the TRISF<2:1> bits will disable the comparator outputs by configuring the pins as inputs.
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21.2 Comparator Operation
21.3.2 INTERNAL REFERENCE SIGNAL
A single comparator is shown in Figure 21-2, along with the relationship between the analog input levels and the digital output. When the analog input at VIN+ is less than the analog input VIN-, the output of the comparator is a digital low level. When the analog input at VIN+ is greater than the analog input VIN-, the output of the comparator is a digital high level. The shaded areas of the output of the comparator in Figure 21-2 represent the uncertainty due to input offsets and response time. The comparator module also allows the selection of an internally generated voltage reference from the comparator voltage reference module. This module is described in more detail in Section 22.0 "Comparator Voltage Reference Module". The internal reference is only available in the mode where four inputs are multiplexed to two comparators (CM2:CM0 = 110). In this mode, the internal voltage reference is applied to the VIN+ pin of both comparators.
21.3
Comparator Reference
Depending on the comparator operating mode, either an external or internal voltage reference may be used. The analog signal present at VIN- is compared to the signal at VIN+ and the digital output of the comparator is adjusted accordingly (Figure 21-2).
21.4
Comparator Response Time
FIGURE 21-2:
SINGLE COMPARATOR
Response time is the minimum time, after selecting a new reference voltage or input source, before the comparator output has a valid level. If the internal reference is changed, the maximum delay of the internal voltage reference must be considered when using the comparator outputs. Otherwise, the maximum delay of the comparators should be used (see Section 26.0 "Electrical Characteristics").
VIN+ VIN-
+ -
Output
21.5
Comparator Outputs
VINVIN+
The comparator outputs are read through the CMCON register. These bits are read-only. The comparator outputs may also be directly output to the RF1 and RF2 I/O pins. When enabled, multiplexors in the output path of the RF1 and RF2 pins will switch and the output of each pin will be the unsynchronized output of the comparator. The uncertainty of each of the comparators is related to the input offset voltage and the response time given in the specifications. Figure 21-3 shows the comparator output block diagram. The TRISF bits will still function as an output enable/ disable for the RF1 and RF2 pins while in this mode.
Output
21.3.1
EXTERNAL REFERENCE SIGNAL
The polarity of the comparator outputs can be changed using the C2INV and C1INV bits (CMCON<5:4>). Note 1: When reading the port register, all pins configured as analog inputs will read as a `0'. Pins configured as digital inputs will convert an analog input according to the Schmitt Trigger input specification. 2: Analog levels on any pin defined as a digital input may cause the input buffer to consume more current than is specified.
When external voltage references are used, the comparator module can be configured to have the comparators operate from the same or different reference sources. However, threshold detector applications may require the same reference. The reference signal must be between VSS and VDD and can be applied to either pin of the comparator(s).
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FIGURE 21-3: COMPARATOR OUTPUT BLOCK DIAGRAM
MULTIPLEX
Port pins
+
To RF1 or RF2 pin D CxINV EN Q Bus Data
Read CMCON
-
D EN Reset
Q
Set CMIF bit From other Comparator
CL
21.6
Comparator Interrupts
21.7
The comparator interrupt flag is set whenever there is a change in the output value of either comparator. Software will need to maintain information about the status of the output bits, as read from CMCON<7:6>, to determine the actual change that occurred. The CMIF bit (PIR2<6>) is the Comparator Interrupt Flag. The CMIF bit must be reset by clearing it. Since it is also possible to write a `1' to this register, a simulated interrupt may be initiated. Both the CMIE bit (PIE2<6>) and the PEIE bit (INTCON<6>) must be set to enable the interrupt. In addition, the GIE bit (INTCON<7>) must also be set. If any of these bits are clear, the interrupt is not enabled, though the CMIF bit will still be set if an interrupt condition occurs. Note: If a change in the CMCON register (C1OUT or C2OUT) should occur when a read operation is being executed (start of the Q2 cycle), then the CMIF (PIR2 register) interrupt flag may not get set.
Comparator Operation During Sleep
When a comparator is active and the device is placed in Sleep mode, the comparator remains active and the interrupt is functional, if enabled. This interrupt will wake-up the device from Sleep mode, when enabled. Each operational comparator will consume additional current, as shown in the comparator specifications. To minimize power consumption while in Sleep mode, turn off the comparators (CM2:CM0 = 111) before entering Sleep. If the device wakes up from Sleep, the contents of the CMCON register are not affected.
21.8
Effects of a Reset
The user, in the Interrupt Service Routine, can clear the interrupt in the following manner: a) b) Any read or write of CMCON will end the mismatch condition. Clear flag bit CMIF.
A device Reset forces the CMCON register to its Reset state, causing the comparator modules to be turned off (CM2:CM0 = 111). However, the input pins (RF3 through RF6) are configured as analog inputs by default on device Reset. The I/O configuration for these pins is determined by the setting of the PCFG3:PCFG0 bits (ADCON1<3:0>). Therefore, device current is minimized when analog inputs are present at Reset time.
A mismatch condition will continue to set flag bit CMIF. Reading CMCON will end the mismatch condition and allow flag bit CMIF to be cleared.
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21.9 Analog Input Connection Considerations
range by more than 0.6V in either direction, one of the diodes is forward biased and a latch-up condition may occur. A maximum source impedance of 10 k is recommended for the analog sources. Any external component connected to an analog input pin, such as a capacitor or a Zener diode, should have very little leakage current.
A simplified circuit for an analog input is shown in Figure 21-4. Since the analog pins are connected to a digital output, they have reverse biased diodes to VDD and VSS. The analog input, therefore, must be between VSS and VDD. If the input voltage deviates from this
FIGURE 21-4:
COMPARATOR ANALOG INPUT MODEL
VDD RS < 10k AIN VT = 0.6V RIC Comparator Input CPIN 5 pF VT = 0.6V ILEAKAGE 500 nA
VA
VSS Legend: CPIN VT ILEAKAGE RIC RS VA = = = = = = Input Capacitance Threshold Voltage Leakage Current at the pin due to various junctions Interconnect Resistance Source Impedance Analog Voltage
TABLE 21-1:
Name INTCON PIR2 PIE2 IPR2 CMCON CVRCON PORTF LATF TRISF
REGISTERS ASSOCIATED WITH COMPARATOR MODULE
Bit 7 Bit 6 Bit 5 TMR0IE -- -- -- C2INV CVRR RF5 LATF5 TRISF5 Bit 4 INT0IE -- -- -- C1INV CVRSS RF4 LATF4 TRISF4 Bit 3 RBIE BCL1IF BCL1IE BCL1IP CIS CVR3 RF3 LATF3 TRISF3 Bit 2 TMR0IF -- -- -- CM2 CVR2 RF2 LATF2 TRISF2 Bit 1 INT0IF TMR3IF TMR3IE TMR3IP CM1 CVR1 RF1 LATF1 TRISF1 Bit 0 RBIF CCP2IF CCP2IE CCP2IP CM0 CVR0 -- -- -- Reset Values on page 49 51 51 51 51 51 52 52 52
GIE/GIEH PEIE/GIEL OSCFIF OSCFIE OSCFIP C2OUT CVREN RF7 LATF7 TRISF7 CMIF CMIE CMIP C1OUT CVROE RF6 LATF6 TRISF6
Legend: -- = unimplemented, read as `0'. Shaded cells are unused by the comparator module.
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22.0 COMPARATOR VOLTAGE REFERENCE MODULE
is selected by the CVRR bit (CVRCON<5>). The primary difference between the ranges is the size of the steps selected by the CVREF Selection bits (CVR3:CVR0), with one range offering finer resolution. The equations used to calculate the output of the comparator voltage reference are as follows: If CVRR = 1: CVREF = ((CVR3:CVR0)/24) x (CVRSRC) If CVRR = 0: CVREF = (CVRSRC/4) + ((CVR3:CVR0)/32) x (CVRSRC) The comparator reference supply voltage can come from either VDD and VSS, or the external VREF+ and VREF- that are multiplexed with RA2 and RA3. The voltage source is selected by the CVRSS bit (CVRCON<4>). The settling time of the comparator voltage reference must be considered when changing the CVREF output (see Table 26-3 in Section 26.0 "Electrical Characteristics").
The comparator voltage reference is a 16-tap resistor ladder network that provides a selectable reference voltage. Although its primary purpose is to provide a reference for the analog comparators, it may also be used independently of them. A block diagram of the module is shown in Figure 22-1. The resistor ladder is segmented to provide two ranges of CVREF values and has a power-down function to conserve power when the reference is not being used. The module's supply reference can be provided from either device VDD/VSS or an external voltage reference.
22.1
Configuring the Comparator Voltage Reference
The voltage reference module is controlled through the CVRCON register (Register 22-1). The comparator voltage reference provides two ranges of output voltage, each with 16 distinct levels. The range to be used
REGISTER 22-1:
CVRCON: COMPARATOR VOLTAGE REFERENCE CONTROL REGISTER
R/W-0 CVREN bit 7 R/W-0 CVROE(1) R/W-0 CVRR R/W-0 CVRSS R/W-0 CVR3 R/W-0 CVR2 R/W-0 CVR1 R/W-0 CVR0 bit 0
bit 7
CVREN: Comparator Voltage Reference Enable bit 1 = CVREF circuit powered on 0 = CVREF circuit powered down CVROE: Comparator VREF Output Enable bit(1) 1 = CVREF voltage level is also output on the RF5/AN10/CVREF pin 0 = CVREF voltage is disconnected from the RF5/AN10/CVREF pin Note 1: CVROE overrides the TRISF<5> bit setting.
bit 6
bit 5
CVRR: Comparator VREF Range Selection bit 1 = 0 to 0.667 CVRSRC, with CVRSRC/24 step size (low range) 0 = 0.25 CVRSRC to 0.75 CVRSRC, with CVRSRC/32 step size (high range) CVRSS: Comparator VREF Source Selection bit 1 = Comparator reference source, CVRSRC = (VREF+) - (VREF-) 0 = Comparator reference source, CVRSRC = VDD - VSS CVR3:CVR0: Comparator VREF Value Selection bits (0 (CVR3:CVR0) 15) When CVRR = 1: CVREF = ((CVR3:CVR0)/24) * (CVRSRC) When CVRR = 0: CVREF = (CVRSRC/4) + ((CVR3:CVR0)/32) * (CVRSRC) Legend: R = Readable bit -n = Value at POR W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown
bit 4
bit 3-0
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FIGURE 22-1: COMPARATOR VOLTAGE REFERENCE BLOCK DIAGRAM
VREF+ VDD CVRSS = 1
CVRSS = 0
8R R R R R 16 Steps
CVR3:CVR0
CVREN
16-to-1 MUX
CVREF
R R R
CVRR VREFCVRSS = 1
8R
CVRSS = 0
22.2
Voltage Reference Accuracy/Error
22.4
Effects of a Reset
The full range of voltage reference cannot be realized due to the construction of the module. The transistors on the top and bottom of the resistor ladder network (Figure 22-1) keep CVREF from approaching the reference source rails. The voltage reference is derived from the reference source; therefore, the CVREF output changes with fluctuations in that source. The tested absolute accuracy of the voltage reference can be found in Section 26.0 "Electrical Characteristics".
A device Reset disables the voltage reference by clearing bit, CVREN (CVRCON<7>). This Reset also disconnects the reference from the RA2 pin by clearing bit, CVROE (CVRCON<6>) and selects the high-voltage range by clearing bit, CVRR (CVRCON<5>). The CVR value select bits are also cleared.
22.5
Connection Considerations
22.3
Operation During Sleep
When the device wakes up from Sleep through an interrupt or a Watchdog Timer time-out, the contents of the CVRCON register are not affected. To minimize current consumption in Sleep mode, the voltage reference should be disabled.
The voltage reference module operates independently of the comparator module. The output of the reference generator may be connected to the RF5 pin if the CVROE bit is set. Enabling the voltage reference output onto RA2 when it is configured as a digital input will increase current consumption. Connecting RF5 as a digital output with CVRSS enabled will also increase current consumption. The RF5 pin can be used as a simple D/A output with limited drive capability. Due to the limited current drive capability, a buffer must be used on the voltage reference output for external connections to VREF. Figure 22-2 shows an example buffering technique.
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FIGURE 22-2: COMPARATOR VOLTAGE REFERENCE OUTPUT BUFFER EXAMPLE
PIC18F87J10
CVREF Module R(1) Voltage Reference Output Impedance RF5
+ -
CVREF Output
Note 1:
R is dependent upon the voltage reference configuration bits, CVRCON<3:0> and CVRCON<5>.
TABLE 22-1:
Name CVRCON CMCON TRISF
REGISTERS ASSOCIATED WITH COMPARATOR VOLTAGE REFERENCE
Bit 7 CVREN C2OUT TRISF7 Bit 6 CVROE C1OUT TRISF6 Bit 5 CVRR C2INV TRISF5 Bit 4 CVRSS C1INV TRISF4 Bit 3 CVR3 CIS TRISF3 Bit 2 CVR2 CM2 TRISF2 Bit 1 CVR1 CM1 TRISF1 Bit 0 CVR0 CM0 -- Reset Values on page 51 51 52
Legend: -- = unimplemented, read as `0'. Shaded cells are not used with the comparator voltage reference.
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NOTES:
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23.0 SPECIAL FEATURES OF THE CPU
23.1.1 CONSIDERATIONS FOR CONFIGURING THE PIC18F87J10 FAMILY DEVICES
PIC18F87J10 family devices include several features intended to maximize reliability and minimize cost through elimination of external components. These are: * Oscillator Selection * Resets: - Power-on Reset (POR) - Power-up Timer (PWRT) - Oscillator Start-up Timer (OST) - Brown-out Reset (BOR) * Interrupts * Watchdog Timer (WDT) * Fail-Safe Clock Monitor * Two-Speed Start-up * Code Protection * In-Circuit Serial Programming The oscillator can be configured for the application depending on frequency, power, accuracy and cost. All of the options are discussed in detail in Section 2.0 "Oscillator Configurations". A complete discussion of device Resets and interrupts is available in previous sections of this data sheet. In addition to their Power-up and Oscillator Start-up Timers provided for Resets, the PIC18F87J10 family of devices have a configurable Watchdog Timer which is controlled in software. The inclusion of an internal RC oscillator also provides the additional benefits of a Fail-Safe Clock Monitor (FSCM) and Two-Speed Start-up. FSCM provides for background monitoring of the peripheral clock and automatic switchover in the event of its failure. Two-Speed Start-up enables code to be executed almost immediately on start-up, while the primary clock source completes its start-up delays. All of these features are enabled and configured by setting the appropriate Configuration register bits.
Unlike previous PIC18 microcontrollers, devices of the PIC18F87J10 family do not use persistent memory registers to store configuration information. The configuration bytes are implemented as volatile memory which means that configuration data must be programmed each time the device is powered up. Configuration data is stored in the four words at the top of the on-chip program memory space, known as the Flash Configuration Words. It is stored in program memory in the same order shown in Table 23-1, with CONFIG1L at the lowest address and CONFIG3H at the highest. The data is automatically loaded in the proper Configuration registers during device power-up. When creating applications for these devices, users should always specifically allocate the location of the Flash Configuration Word for configuration data; this is to make certain that program code is not stored in this address when the code is compiled. The volatile memory cells used for the configuration bits always reset to `1' on Power-on Resets. For all other type of Reset events, the previously programmed values are maintained and used without reloading from program memory. The four Most Significant bits of CONFIG1H, CONFIG2H and CONFIG3H in program memory should also be `1111'. This makes these Configuration Words appear to be NOP instructions in the remote event that their locations are ever executed by accident. Since configuration bits are not implemented in the corresponding locations, writing `1's to these locations has no effect on device operation. To prevent inadvertent configuration changes during code execution, all programmable configuration bits are write-once. After a bit is initially programmed during a power cycle, it cannot be written to again. Changing a device configuration requires that power to the device be cycled.
23.1
Configuration Bits
The configuration bits can be programmed (read as `0') or left unprogrammed (read as `1') to select various device configurations. These bits are mapped starting at program memory location 300000h. A complete list is shown in Table 23-1. A detailed explanation of the various bit functions is provided in Register 23-1 through Register 23-6. Note that address 300000h is beyond the user program memory space. In fact, it belongs to the configuration memory space (300000h-3FFFFFh) which can only be accessed using table reads and table writes.
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TABLE 23-1:
File Name 300000h 300001h 300002h 300003h 300004h 300005h CONFIG1L CONFIG1H CONFIG2L CONFIG2H CONFIG3L CONFIG3H
CONFIGURATION BITS AND DEVICE IDs
Bit 7 DEBUG --(2) IESO --(2) WAIT(4) --(2) DEV2 DEV10 Bit 6 XINST --(2) FCMEN --(2) BW(4) --(2) DEV1 DEV9 Bit 5 STVREN --(2) -- --(2) EMB1(4) --(2) DEV0 DEV8 Bit 4 -- --(2) -- --(2) --(2) REV4 DEV7 Bit 3 -- --(3) -- WDTPS3 -- REV3 DEV6 Bit 2 -- CP0 FOSC2 WDTPS2 -- -- REV2 DEV5 Bit 1 -- -- FOSC1 WDTPS1 -- REV1 DEV4 Bit 0 WDTEN -- FOSC0 WDTPS0 -- REV0 DEV3 Default/ Unprogrammed Value(1) 111- ---1 ---- 01-11-- -111 ---- 1111 1111 1--xxxx xxxx(5) 0000 10x1(5)
EMB0(4) EASHFT(4)
ECCPMX(4) CCP2MX ---- --11
3FFFFEh DEVID1 3FFFFFh DEVID2 Legend: Note 1: 2: 3: 4: 5:
x = unknown, u = unchanged, - = unimplemented. Shaded cells are unimplemented, read as `0'. Values reflect the unprogrammed state as received from the factory and following Power-on Resets. In all other Reset states, the configuration bytes maintain their previously programmed states. The value of these bits in program memory should always be `1'. This ensures that the location is executed as a NOP if it is accidentally executed. This bit should always be maintained as `0'. Implemented in 80-pin devices only. See Register 23-7 and Register 23-8 for DEVID values. These registers are read-only and cannot be programmed by the user.
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REGISTER 23-1: CONFIG1L: CONFIGURATION REGISTER 1 LOW (BYTE ADDRESS 300000h)
R/WO-1 DEBUG bit 7 bit 7 R/WO-1 XINST R/WO-1 STVREN U-0 -- U-0 -- U-0 -- U-0 -- R/WO-1 WDTEN bit 0
DEBUG: Background Debugger Enable bit 1 = Background debugger disabled; RB6 and RB7 configured as general purpose I/O pins 0 = Background debugger enabled; RB6 and RB7 are dedicated to In-Circuit Debug XINST: Extended Instruction Set Enable bit 1 = Instruction set extension and Indexed Addressing mode enabled 0 = Instruction set extension and Indexed Addressing mode disabled (Legacy mode) STVREN: Stack Overflow/Underflow Reset Enable bit 1 = Reset on stack overflow/underflow enabled 0 = Reset on stack overflow/underflow disabled Unimplemented: Read as `0' WDTEN: Watchdog Timer Enable bit 1 = WDT enabled 0 = WDT disabled (control is placed on SWDTEN bit) Legend: R = Readable bit WO = Write-once bit U = Unimplemented bit, read as `0' `1' = Bit is set `0' = Bit is cleared -n = Value when device is unprogrammed
bit 6
bit 5
bit 4-1 bit 0
REGISTER 23-2:
CONFIG1H: CONFIGURATION REGISTER 1 HIGH (BYTE ADDRESS 300001h)
U-0 -- bit 7 U-0 -- U-0 -- U-0 -- U-0 --(1) R/WO-1 CP0 U-0 -- U-0 -- bit 0
bit 7-3 bit 2
Unimplemented: Read as `0' CP0: Code Protection bit 1 = Program memory is not code-protected 0 = Program memory is code-protected Unimplemented: Read as `0' Note 1: This bit should always be maintained as `0'. Legend: R = Readable bit WO = Write-once bit U = Unimplemented bit, read as `0' `1' = Bit is set `0' = Bit is cleared -n = Value when device is unprogrammed
bit 1-0
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REGISTER 23-3: CONFIG2L: CONFIGURATION REGISTER 2 LOW (BYTE ADDRESS 300002h)
R/WO-1 IESO bit 7 bit 7 IESO: Two-Speed Start-up (Internal/External Oscillator Switchover) Control bit 1 = Two-Speed Start-up enabled 0 = Two-Speed Start-up disabled FCMEN: Fail-Safe Clock Monitor Enable bit 1 = Fail-Safe Clock Monitor enabled 0 = Fail-Safe Clock Monitor disabled Unimplemented: Read as `0' FOSC2: Default/Reset System Clock Select bit 1 = Clock selected by FOSC1:FOSC0 as system clock is enabled when OSCCON<1:0> = 00 0 = INTRC enabled as system clock when OSCCON<1:0> = 00 FOSC1:FOSC0: Oscillator Selection bits 11 = EC oscillator, PLL enabled and under software control, CLKO function on OSC2 10 = EC oscillator, CLKO function on OSC2 01 = HS oscillator, PLL enabled and under software control 00 = HS oscillator Legend: R = Readable bit WO = Write-once bit U = Unimplemented bit, read as `0' `1' = Bit is set `0' = Bit is cleared -n = Value when device is unprogrammed R/WO-1 FCMEN U-0 -- U-0 -- U-0 -- R/WO-1 FOSC2 R/WO-1 FOSC1 R/WO-1 FOSC0 bit 0
bit 6
bit 5-3 bit 2
bit 1-0
REGISTER 23-4:
CONFIG2H: CONFIGURATION REGISTER 2 HIGH (BYTE ADDRESS 300003h)
U-0 -- bit 7 U-0 -- U-0 -- U-0 -- R/WO-1 WDTPS3 R/WO-1 WDTPS2 R/WO-1 WDTPS1 R/WO-1 WDTPS0 bit 0
bit 7-4 bit 3-0
Unimplemented: Read as `0' WDTPS3:WDTPS0: Watchdog Timer Postscale Select bits 1111 = 1:32,768 1110 = 1:16,384 1101 = 1:8,192 1100 = 1:4,096 1011 = 1:2,048 1010 = 1:1,024 1001 = 1:512 1000 = 1:256 0111 = 1:128 0110 = 1:64 0101 = 1:32 0100 = 1:16 0011 = 1:8 0010 = 1:4 0001 = 1:2 0000 = 1:1 Legend: R = Readable bit WO = Write-once bit -n = Value when device is unprogrammed
U = Unimplemented bit, read as `0' `1' = Bit is set `0' = Bit is cleared
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REGISTER 23-5: CONFIG3L: CONFIGURATION REGISTER 3 LOW (BYTE ADDRESS 300004h)
R/WO-1 WAIT(1) bit 7 bit 7 WAIT: External Bus Wait Enable bit(1) 1 = Wait states for operations on external memory bus disabled 0 = Wait states for operations on external memory bus enabled BW: Data Bus Width Select bit(1) 1 = 16-bit External Bus mode 0 = 8-bit External Bus mode EMB1:EMB0: External Memory Bus Configuration bits(1) 11 = Extended Microcontroller mode, 20-bit Address mode 10 = Extended Microcontroller mode,16-bit Address mode 01 = Extended Microcontroller mode,12-bit Address mode 00 = Microcontroller mode - external bus disabled EASHFT: External Address Bus Shift Enable bit(1) 1 = Address shifting enabled; address on external bus is offset to start at 000000h 0 = Address shifting disabled; address on external bus reflects the PC value Unimplemented: Read as `0' Note 1: Implemented only on 80-pin devices. Legend: R = Readable bit WO = Write-once bit U = Unimplemented bit, read as `0' `1' = Bit is set `0' = Bit is cleared -n = Value when device is unprogrammed R/WO-1 BW(1) R/WO-1 EMB1(1) R/WO-1 EMB0(1) R/WO-1 EASHFT(1) U-0 -- U-0 -- U-0 -- bit 0
bit 6
bit 5-4
bit 3
bit 2-0
REGISTER 23-6:
CONFIG3H: CONFIGURATION REGISTER 3 HIGH (BYTE ADDRESS 300005h)
U-0 -- bit 7 U-0 -- U-0 -- U-0 -- U-0 -- U-0 -- R/WO-1 R/WO-1 bit 0 ECCPMX(1) CCP2MX
bit 7-2 bit 1
Unimplemented: Read as `0' ECCPMX: ECCP Mux bit(1) 1 = ECCP1 outputs (P1B/P1C) are multiplexed with RE6 and RE5; ECCP3 outputs (P3B/P3C) are multiplexed with RE4 and RE3 0 = ECCP1 outputs (P1B/P1C) are multiplexed with RH7 and RH6; ECCP3 outputs (P3B/P3C) are multiplexed with RH5 and RH4 CCP2MX: CCP2 Mux bit 1 = ECCP2/P2A is multiplexed with RC1 0 = ECCP2/P2A is multiplexed with RE7 in Microcontroller mode (all devices) or with RB3 in Extended Microcontroller mode (80-pin devices only) Note 1: Available only on 80-pin devices. Legend: R = Readable bit WO = Write-once bit U = Unimplemented bit, read as `0' `1' = Bit is set `0' = Bit is cleared -n = Value when device is unprogrammed
bit 0
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REGISTER 23-7: DEVICE ID REGISTER 1 FOR PIC18F87J10 FAMILY DEVICES
R DEV2 bit 7 bit 7-5 DEV2:DEV0: Device ID bits 111 = PIC18F85J10 101 = PIC18F67J10 100 = PIC18F66J15 011 = PIC18F66J10 or PIC18F87J10 010 = PIC18F65J15 or PIC18F86J15 001 = PIC18F65J10 or PIC18F86J10 000 = PIC18F85J15 Note: bit 4-0 Where values for DEV2:DEV0 are shared by more than one device number, the specific device is always identified by using the entire DEV10:DEV0 bit sequence. R DEV1 R DEV0 R REV4 R REV3 R REV2 R REV1 R REV0 bit 0
REV4:REV0: Revision ID bits These bits are used to indicate the device revision. Legend: R = Read-only bit -n = Value when device is unprogrammed U = Unimplemented bit, read as `0' u = Unchanged from programmed state
REGISTER 23-8:
DEVICE ID REGISTER 2 FOR PIC18F87J10 FAMILY DEVICES
R DEV10 bit 7 R DEV9 R DEV8 R DEV7 R DEV6 R DEV5 R DEV4 R DEV3 bit 0
bit 7-0
DEV10:DEV3: Device ID bits These bits are used with the DEV2:DEV0 bits in the Device ID Register 1 to identify the part number. 0001 0101 = PIC18F65J10/65J15/66J10/66J15/67J10/85J10 devices 0001 0111 = PIC18F85J15/86J10/86J15/87J10 devices Note: The values for DEV10:DEV3 may be shared with other device families. The specific device is always identified by using the entire DEV10:DEV0 bit sequence.
Legend: R = Read-only bit -n = Value when device is unprogrammed U = Unimplemented bit, read as `0' u = Unchanged from programmed state
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23.2 Watchdog Timer (WDT)
For PIC18F87J10 family devices, the WDT is driven by the INTRC oscillator. When the WDT is enabled, the clock source is also enabled. The nominal WDT period is 4 ms and has the same stability as the INTRC oscillator. The 4 ms period of the WDT is multiplied by a 16-bit postscaler. Any output of the WDT postscaler is selected by a multiplexor, controlled by the WDTPS bits in Configuration Register 2H. Available periods range from 4 ms to 131.072 seconds (2.18 minutes). The WDT and postscaler are cleared whenever a SLEEP or CLRWDT instruction is executed, or a clock failure (primary or Timer1 oscillator) has occurred. Note 1: The CLRWDT and SLEEP instructions clear the WDT and postscaler counts when executed. 2: When a CLRWDT instruction is executed, the postscaler count will be cleared.
23.2.1
CONTROL REGISTER
The WDTCON register (Register 23-9) is a readable and writable register. The SWDTEN bit enables or disables WDT operation. This allows software to override the WDTEN configuration bit and enable the WDT only if it has been disabled by the configuration bit.
FIGURE 23-1:
SWDTEN
WDT BLOCK DIAGRAM
Enable WDT INTRC Control
WDT Counter INTRC Oscillator /128 Wake-up from Power-Managed Modes Programmable Postscaler 1:1 to 1:32,768 4 Reset WDT Reset
CLRWDT
All Device Resets WDTPS3:WDTPD0 Sleep
WDT
REGISTER 23-9:
WDTCON: WATCHDOG TIMER CONTROL REGISTER
U-0 -- bit 7 U-0 -- U-0 -- U-0 -- U-0 -- U-0 -- U-0 -- R/W-0 SWDTEN(1) bit 0
bit 7-1 bit 0
Unimplemented: Read as `0' SWDTEN: Software Controlled Watchdog Timer Enable bit(1) 1 = Watchdog Timer is on 0 = Watchdog Timer is off Note 1: This bit has no effect if the configuration bit, WDTEN, is enabled. Legend: R = Readable bit -n = Value at POR W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown
TABLE 23-2:
Name RCON WDTCON
SUMMARY OF WATCHDOG TIMER REGISTERS
Bit 7 IPEN -- Bit 6 -- -- Bit 5 -- -- Bit 4 RI -- Bit 3 TO -- Bit 2 PD -- Bit 1 POR -- Bit 0 BOR SWDTEN Reset Values on page 50 50
Legend: -- = unimplemented, read as `0'. Shaded cells are not used by the Watchdog Timer.
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23.3 On-Chip Voltage Regulator
FIGURE 23-2:
All of the PIC18F87J10 family devices power their core digital logic at a nominal 2.5V. This may create an issue for designs that are required to operate at a higher typical voltage, such as 3.3V. To simplify system design, all devices in the PIC18F87J10 family incorporate an on-chip regulator that allows the device to run its core logic from VDD. The regulator is controlled by the ENVREG pin. Tying VDD to the pin enables the regulator, which in turn, provides power to the core from the other VDD pins. When the regulator is enabled, a low-ESR filter capacitor must be connected to the VDDCORE/VCAP pin (Figure 23-2). This helps to maintain the stability of the regulator. The recommended value for the filer capacitor is provided in Section 26.3 "DC Characteristics: PIC18F87J10 Family (Industrial)". If ENVREG is tied to VSS, the regulator is disabled. In this case, separate power for the core logic at a nominal 2.5V must be supplied to the device on the VDDCORE/VCAP pin to run the I/O pins at higher voltage levels, typically 3.3V. Alternatively, the VDDCORE/VCAP and VDD pins can be tied together to operate at a lower nominal voltage. Refer to Figure 23-2 for possible configurations.
CONNECTIONS FOR THE ON-CHIP REGULATOR
Regulator Enabled (ENVREG tied to VDD): 3.3V PIC18FXXJ10/XXJ15 VDD ENVREG VDDCORE/VCAP CF VSS
Regulator Disabled (ENVREG tied to ground): 2.5V(1) 3.3V(1) PIC18FXXJ10/XXJ15 VDD ENVREG VDDCORE/VCAP VSS
23.3.1
ON-CHIP REGULATOR AND BOR
Regulator Disabled (VDD tied to VDDCORE): 2.5V(1) PIC18FXXJ10/XXJ15 VDD ENVREG VDDCORE/VCAP VSS
When the on-chip regulator is enabled, PIC18F87J10 family devices also have a simple brown-out capability. If the voltage supplied to the regulator is inadequate to maintain a regulated level, the regulator Reset circuitry will generate a BOR Reset. This event is captured by the BOR flag bit (RCON<0>). The operation of the BOR is described in more detail in Section 4.4 "Brown-out Reset (BOR)" and Section 4.4.1 "Detecting BOR". The brown-out voltage levels are specific in Section 26.1 "DC Characteristics: Supply Voltage, PIC18F87J10 Family (Industrial)".
23.3.2
POWER-UP REQUIREMENTS
Note 1:
The on-chip regulator is designed to meet the power-up requirements for the device. If the application does not use the regulator, then strict power-up conditions must be adhered to. While powering up, VDDCORE must never exceed VDD by 0.3 volts.
These are typical operating voltages. Refer to Section 26.1 "DC Characteristics: Supply Voltage" for the full operating ranges of VDD and VDDCORE.
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23.4 Two-Speed Start-up
The Two-Speed Start-up feature helps to minimize the latency period, from oscillator start-up to code execution, by allowing the microcontroller to use the INTRC oscillator as a clock source until the primary clock source is available. It is enabled by setting the IESO configuration bit. Two-Speed Start-up should be enabled only if the primary oscillator mode is HS or HSPLL (Crystal-based) modes. Since the EC and ECPLL modes do not require an OST start-up delay, Two-Speed Start-up should be disabled. When enabled, Resets and wake-ups from Sleep mode cause the device to configure itself to run from the internal oscillator block as the clock source, following the time-out of the Power-up Timer after a POR Reset is enabled. This allows almost immediate code execution while the primary oscillator starts and the OST is running. Once the OST times out, the device automatically switches to PRI_RUN mode. In all other power-managed modes, Two-Speed Start-up is not used. The device will be clocked by the currently selected clock source until the primary clock source becomes available. The setting of the IESO bit is ignored.
23.4.1
SPECIAL CONSIDERATIONS FOR USING TWO-SPEED START-UP
While using the INTRC oscillator in Two-Speed Start-up, the device still obeys the normal command sequences for entering power-managed modes, including serial SLEEP instructions (refer to Section 3.1.4 "Multiple Sleep Commands"). In practice, this means that user code can change the SCS1:SCS0 bit settings or issue SLEEP instructions before the OST times out. This would allow an application to briefly wake-up, perform routine "housekeeping" tasks and return to Sleep before the device starts to operate from the primary oscillator. User code can also check if the primary clock source is currently providing the device clocking by checking the status of the OSTS bit (OSCCON<3>). If the bit is set, the primary oscillator is providing the clock. Otherwise, the internal oscillator block is providing the clock during wake-up from Reset or Sleep mode.
FIGURE 23-3:
TIMING TRANSITION FOR TWO-SPEED START-UP (INTRC TO HSPLL)
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3
INTOSC OSC1 TOST(1) PLL Clock Output CPU Clock Peripheral Clock Program Counter PC Wake from Interrupt Event Note 1: PC + 2 OSTS bit Set PC + 4 PC + 6 TPLL(1) 1 2 n-1 n
Clock Transition
TOST = 1024 TOSC; TPLL = 2 ms (approx). These intervals are not shown to scale.
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23.5 Fail-Safe Clock Monitor
The Fail-Safe Clock Monitor (FSCM) allows the microcontroller to continue operation in the event of an external oscillator failure by automatically switching the device clock to the internal oscillator block. The FSCM function is enabled by setting the FCMEN configuration bit. When FSCM is enabled, the INTRC oscillator runs at all times to monitor clocks to peripherals and provide a backup clock in the event of a clock failure. Clock monitoring (shown in Figure 23-4) is accomplished by creating a sample clock signal which is the INTRC output divided by 64. This allows ample time between FSCM sample clocks for a peripheral clock edge to occur. The peripheral device clock and the sample clock are presented as inputs to the Clock Monitor latch (CM). The CM is set on the falling edge of the device clock source but cleared on the rising edge of the sample clock. To use a higher clock speed on wake-up, the INTOSC or postscaler clock sources can be selected to provide a higher clock speed by setting bits IRCF2:IRCF0 immediately after Reset. For wake-ups from Sleep, the INTOSC or postscaler clock sources can be selected by setting IRCF2:IRCF0 prior to entering Sleep mode. The FSCM will detect failures of the primary or secondary clock sources only. If the internal oscillator block fails, no failure would be detected, nor would any action be possible.
23.5.1
FSCM AND THE WATCHDOG TIMER
Both the FSCM and the WDT are clocked by the INTRC oscillator. Since the WDT operates with a separate divider and counter, disabling the WDT has no effect on the operation of the INTRC oscillator when the FSCM is enabled. As already noted, the clock source is switched to the INTRC clock when a clock failure is detected; this may mean a substantial change in the speed of code execution. If the WDT is enabled with a small prescale value, a decrease in clock speed allows a WDT time-out to occur and a subsequent device Reset. For this reason, fail-safe clock events also reset the WDT and postscaler, allowing it to start timing from when execution speed was changed and decreasing the likelihood of an erroneous time-out.
FIGURE 23-4:
FSCM BLOCK DIAGRAM
Clock Monitor Latch (CM) (edge-triggered)
Peripheral Clock
S
Q
INTRC Source (32 s)
/ 64 488 Hz (2.048 ms)
C
Q
23.5.2
EXITING FAIL-SAFE OPERATION
Clock Failure Detected
Clock failure is tested for on the falling edge of the sample clock. If a sample clock falling edge occurs while CM is still set, a clock failure has been detected (Figure 23-5). This causes the following: * the FSCM generates an oscillator fail interrupt by setting bit OSCFIF (PIR2<7>); * the device clock source is switched to the internal oscillator block (OSCCON is not updated to show the current clock source - this is the fail-safe condition); and * the WDT is reset. During switchover, the postscaler frequency from the internal oscillator block may not be sufficiently stable for timing sensitive applications. In these cases, it may be desirable to select another clock configuration and enter an alternate power-managed mode. This can be done to attempt a partial recovery or execute a controlled shutdown. See Section 3.1.4 "Multiple Sleep Commands" and Section 23.4.1 "Special Considerations for Using Two-Speed Start-up" for more details.
The fail-safe condition is terminated by either a device Reset or by entering a power-managed mode. On Reset, the controller starts the primary clock source specified in Configuration Register 2H (with any required start-up delays that are required for the oscillator mode, such as OST or PLL timer). The INTRC oscillator provides the device clock until the primary clock source becomes ready (similar to a Two-Speed Start-up). The clock source is then switched to the primary clock (indicated by the OSTS bit in the OSCCON register becoming set). The Fail-Safe Clock Monitor then resumes monitoring the peripheral clock. The primary clock source may never become ready during start-up. In this case, operation is clocked by the INTRC oscillator. The OSCCON register will remain in its Reset state until a power-managed mode is entered.
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FIGURE 23-5:
Sample Clock Device Clock Output CM Output (Q) Failure Detected OSCFIF Oscillator Failure
FSCM TIMING DIAGRAM
CM Test Note:
CM Test
CM Test
The device clock is normally at a much higher frequency than the sample clock. The relative frequencies in this example have been chosen for clarity.
23.5.3
FSCM INTERRUPTS IN POWER-MANAGED MODES
23.5.4
POR OR WAKE-UP FROM SLEEP
By entering a power-managed mode, the clock multiplexor selects the clock source selected by the OSCCON register. Fail-Safe Monitoring of the power-managed clock source resumes in the power-managed mode. If an oscillator failure occurs during power-managed operation, the subsequent events depend on whether or not the oscillator failure interrupt is enabled. If enabled (OSCFIF = 1), code execution will be clocked by the INTOSC multiplexor. An automatic transition back to the failed clock source will not occur. If the interrupt is disabled, subsequent interrupts while in Idle mode will cause the CPU to begin executing instructions while being clocked by the INTOSC source.
The FSCM is designed to detect oscillator failure at any point after the device has exited Power-on Reset (POR) or low-power Sleep mode. When the primary device clock is either EC or INTRC modes, monitoring can begin immediately following these events. For HS or HSPLL modes, the situation is somewhat different. Since the oscillator may require a start-up time considerably longer than the FSCM sample clock time, a false clock failure may be detected. To prevent this, the internal oscillator block is automatically configured as the device clock and functions until the primary clock is stable (the OST and PLL timers have timed out). This is identical to Two-Speed Start-up mode. Once the primary clock is stable, the INTRC returns to its role as the FSCM source. Note: The same logic that prevents false oscillator failure interrupts on POR, or wake from Sleep, will also prevent the detection of the oscillator's failure to start at all following these events. This can be avoided by monitoring the OSTS bit and using a timing routine to determine if the oscillator is taking too long to start. Even so, no oscillator failure interrupt will be flagged.
As noted in Section 23.4.1 "Special Considerations for Using Two-Speed Start-up", it is also possible to select another clock configuration and enter an alternate power-managed mode while waiting for the primary clock to become stable. When the new power-managed mode is selected, the primary clock is disabled.
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23.6 Program Verification and Code Protection 23.7 In-Circuit Serial Programming
PIC18F87J10 family microcontrollers can be serially programmed while in the end application circuit. This is simply done with two lines for clock and data and three other lines for power, ground and the programming voltage. This allows customers to manufacture boards with unprogrammed devices and then program the microcontroller just before shipping the product. This also allows the most recent firmware or a custom firmware to be programmed.
For all devices in the PIC18F87J10 family of devices, the on-chip program memory space is treated as a single block. Code protection for this block is controlled by one configuration bit, CP0. This bit inhibits external reads and writes to the program memory space. It has no direct effect in normal execution mode.
23.6.1
CONFIGURATION REGISTER PROTECTION
The Configuration registers are protected against untoward changes or reads in two ways. The primary protection is the write-once feature of the configuration bits which prevents reconfiguration once the bit has been programmed during a power cycle. To safeguard against unpredictable events, configuration bit changes resulting from individual cell-level disruptions (such as ESD events) will cause a parity error and trigger a device Reset. The data for the Configuration registers is derived from the Flash Configuration Words in program memory. When the CP0 bit set, the source data for device configuration is also protected as a consequence.
23.8
In-Circuit Debugger
When the DEBUG configuration bit is programmed to a `0', the In-Circuit Debugger functionality is enabled. This function allows simple debugging functions when used with MPLAB(R) IDE. When the microcontroller has this feature enabled, some resources are not available for general use. Table 23-3 shows which resources are required by the background debugger.
TABLE 23-3:
I/O pins: Stack:
DEBUGGER RESOURCES
RB6, RB7 2 levels 512 bytes 10 bytes
Program Memory: Data Memory:
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24.0 INSTRUCTION SET SUMMARY
The literal instructions may use some of the following operands: * A literal value to be loaded into a file register (specified by `k') * The desired FSR register to load the literal value into (specified by `f') * No operand required (specified by `--') The control instructions may use some of the following operands: * A program memory address (specified by `n') * The mode of the CALL or RETURN instructions (specified by `s') * The mode of the table read and table write instructions (specified by `m') * No operand required (specified by `--') All instructions are a single word, except for four double-word instructions. These instructions were made double-word to contain the required information in 32 bits. In the second word, the 4 MSbs are 1's. If this second word is executed as an instruction (by itself), it will execute as a NOP. All single-word instructions are executed in a single instruction cycle, unless a conditional test is true or the program counter is changed as a result of the instruction. In these cases, the execution takes two instruction cycles with the additional instruction cycle(s) executed as a NOP. The double word instructions execute in two instruction cycles. One instruction cycle consists of four oscillator periods. Thus, for an oscillator frequency of 4 MHz, the normal instruction execution time is 1 s. If a conditional test is true, or the program counter is changed as a result of an instruction, the instruction execution time is 2 s. Two-word branch instructions (if true) would take 3 s. Figure 24-1 shows the general formats that the instructions can have. All examples use the convention `nnh' to represent a hexadecimal number. The Instruction Set Summary, shown in Table 24-2, lists the standard instructions recognized by the Microchip MPASMTM Assembler. Section 24.1.1 "Standard Instruction Set" provides a description of each instruction. The PIC18F87J10 family of devices incorporate the standard set of 75 PIC18 core instructions, as well as an extended set of 8 new instructions for the optimization of code that is recursive or that utilizes a software stack. The extended set is discussed later in this section.
24.1
Standard Instruction Set
The standard PIC18 instruction set adds many enhancements to the previous PICmicro(R) instruction sets, while maintaining an easy migration from these PICmicro instruction sets. Most instructions are a single program memory word (16 bits), but there are four instructions that require two program memory locations. Each single-word instruction is a 16-bit word divided into an opcode, which specifies the instruction type and one or more operands, which further specify the operation of the instruction. The instruction set is highly orthogonal and is grouped into four basic categories: * * * * Byte-oriented operations Bit-oriented operations Literal operations Control operations
The PIC18 instruction set summary in Table 24-2 lists byte-oriented, bit-oriented, literal and control operations. Table 24-1 shows the opcode field descriptions. Most byte-oriented instructions have three operands: 1. 2. 3. The file register (specified by `f') The destination of the result (specified by `d') The accessed memory (specified by `a')
The file register designator `f' specifies which file register is to be used by the instruction. The destination designator `d' specifies where the result of the operation is to be placed. If `d' is zero, the result is placed in the WREG register. If `d' is one, the result is placed in the file register specified in the instruction. All bit-oriented instructions have three operands: 1. 2. 3. The file register (specified by `f') The bit in the file register (specified by `b') The accessed memory (specified by `a')
The bit field designator `b' selects the number of the bit affected by the operation, while the file register designator `f' represents the number of the file in which the bit is located.
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TABLE 24-1:
Field a
OPCODE FIELD DESCRIPTIONS
Description RAM access bit: a = 0: RAM location in Access RAM (BSR register is ignored) a = 1: RAM bank is specified by BSR register Bit address within an 8-bit file register (0 to 7). Bank Select Register. Used to select the current RAM bank. ALU status bits: Carry, Digit Carry, Zero, Overflow, Negative. Destination select bit: d = 0: store result in WREG d = 1: store result in file register f Destination: either the WREG register or the specified register file location. 8-bit Register file address (00h to FFh), or 2-bit FSR designator (0h to 3h). 12-bit Register file address (000h to FFFh). This is the source address. 12-bit Register file address (000h to FFFh). This is the destination address. Global Interrupt Enable bit. Literal field, constant data or label (may be either an 8-bit, 12-bit or a 20-bit value). Label name. The mode of the TBLPTR register for the table read and table write instructions. Only used with table read and table write instructions: No Change to register (such as TBLPTR with table reads and writes) Post-Increment register (such as TBLPTR with table reads and writes) Post-Decrement register (such as TBLPTR with table reads and writes) Pre-Increment register (such as TBLPTR with table reads and writes) The relative address (2's complement number) for relative branch instructions or the direct address for Call/Branch and Return instructions. Program Counter. Program Counter Low Byte. Program Counter High Byte. Program Counter High Byte Latch. Program Counter Upper Byte Latch. Power-Down bit. Product of Multiply High Byte. Product of Multiply Low Byte. Fast Call/Return mode select bit: s = 0: do not update into/from shadow registers s = 1: certain registers loaded into/from shadow registers (Fast mode) 21-bit Table Pointer (points to a Program Memory location). 8-bit Table Latch. Time-out bit. Top-of-Stack. Unused or Unchanged. Watchdog Timer. Working register (accumulator). Don't care (`0' or `1'). The assembler will generate code with x = 0. It is the recommended form of use for compatibility with all Microchip software tools. 7-bit offset value for indirect addressing of register files (source). 7-bit offset value for indirect addressing of register files (destination).
bbb BSR C, DC, Z, OV, N d
dest f fs fd GIE k label mm * *+ *+* n PC PCL PCH PCLATH PCLATU PD PRODH PRODL s
TBLPTR TABLAT TO TOS u WDT WREG x zs zd { } [text] (text) [expr] <> italics
Optional argument. Indicates an indexed address. The contents of text. Specifies bit n of the register indicated by the pointer expr. Assigned to. Register bit field. In the set of. User-defined term (font is Courier).
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FIGURE 24-1: GENERAL FORMAT FOR INSTRUCTIONS
Byte-oriented file register operations 15 10 9 87 OPCODE d a 0 f (FILE #) ADDWF MYREG, W, B Example Instruction
d = 0 for result destination to be WREG register d = 1 for result destination to be file register (f) a = 0 to force Access Bank a = 1 for BSR to select bank f = 8-bit file register address Byte to Byte move operations (2-word) 15 12 11 OPCODE 15 12 11 1111 f (Destination FILE #) 0 f (Source FILE #) 0 MOVFF MYREG1, MYREG2
f = 12-bit file register address Bit-oriented file register operations 15 12 11 98 7 f (FILE #) 0 BSF MYREG, bit, B
OPCODE b (BIT #) a
b = 3-bit position of bit in file register (f) a = 0 to force Access Bank a = 1 for BSR to select bank f = 8-bit file register address Literal operations 15 OPCODE k = 8-bit immediate value Control operations CALL, GOTO and Branch operations 15 OPCODE 15 1111 12 11 n<19:8> (literal) 87 n<7:0> (literal) 0 0 GOTO Label 8 7 k (literal) 0 MOVLW 7Fh
n = 20-bit immediate value 15 OPCODE 15 1111 S = Fast bit 15 OPCODE 15 OPCODE 11 10 n<10:0> (literal) 87 n<7:0> (literal) 0 BC MYFUNC 0 BRA MYFUNC 12 11 n<19:8> (literal) 87 S n<7:0> (literal) 0 0 CALL MYFUNC
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TABLE 24-2:
Mnemonic, Operands
PIC18F87J10 FAMILY INSTRUCTION SET
16-Bit Instruction Word Description Cycles MSb LSb Status Affected Notes
BYTE-ORIENTED OPERATIONS ADDWF ADDWFC ANDWF CLRF COMF CPFSEQ CPFSGT CPFSLT DECF DECFSZ DCFSNZ INCF INCFSZ INFSNZ IORWF MOVF MOVFF MOVWF MULWF NEGF RLCF RLNCF RRCF RRNCF SETF SUBFWB SUBWF SUBWFB SWAPF TSTFSZ XORWF Note 1: f, d, a f, d, a f, d, a f, a f, d, a f, a f, a f, a f, d, a f, d, a f, d, a f, d, a f, d, a f, d, a f, d, a f, d, a fs, fd f, a f, a f, a f, d, a f, d, a f, d, a f, d, a f, a f, d, a f, d, a f, d, a f, d, a f, a f, d, a Add WREG and f Add WREG and Carry bit to f AND WREG with f Clear f Complement f Compare f with WREG, skip = Compare f with WREG, skip > Compare f with WREG, skip < Decrement f Decrement f, Skip if 0 Decrement f, Skip if Not 0 Increment f Increment f, Skip if 0 Increment f, Skip if Not 0 Inclusive OR WREG with f Move f Move fs (source) to 1st word fd (destination) 2nd word Move WREG to f Multiply WREG with f Negate f Rotate Left f through Carry Rotate Left f (No Carry) Rotate Right f through Carry Rotate Right f (No Carry) Set f Subtract f from WREG with borrow Subtract WREG from f Subtract WREG from f with borrow Swap nibbles in f Test f, skip if 0 Exclusive OR WREG with f 1 1 1 1 1 1 (2 or 3) 1 (2 or 3) 1 (2 or 3) 1 1 (2 or 3) 1 (2 or 3) 1 1 (2 or 3) 1 (2 or 3) 1 1 2 1 1 1 1 1 1 1 1 1 1 1 0010 0010 0001 0110 0001 0110 0110 0110 0000 0010 0100 0010 0011 0100 0001 0101 1100 1111 0110 0000 0110 0011 0100 0011 0100 0110 0101 01da 00da 01da 101a 11da 001a 010a 000a 01da 11da 11da 10da 11da 10da 00da 00da ffff ffff 111a 001a 110a 01da 01da 00da 00da 100a 01da ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff C, DC, Z, OV, N C, DC, Z, OV, N Z, N Z Z, N None None None C, DC, Z, OV, N None None C, DC, Z, OV, N None None Z, N Z, N None 1, 2 1, 2 1,2 2 1, 2 4 4 1, 2 1, 2, 3, 4 1, 2, 3, 4 1, 2 1, 2, 3, 4 4 1, 2 1, 2 1
None None 1, 2 C, DC, Z, OV, N C, Z, N 1, 2 Z, N C, Z, N Z, N None 1, 2 C, DC, Z, OV, N
0101 11da 0101 10da
ffff C, DC, Z, OV, N 1, 2 ffff C, DC, Z, OV, N ffff None ffff None ffff Z, N 4 1, 2
1 0011 10da 1 (2 or 3) 0110 011a 1 0001 10da
2: 3: 4:
5:
When a port register is modified as a function of itself (e.g., MOVF PORTB, 1, 0), the value used will be that value present on the pins themselves. For example, if the data latch is `1' for a pin configured as input and is driven low by an external device, the data will be written back with a `0'. If this instruction is executed on the TMR0 register (and, where applicable, d = 1), the prescaler will be cleared if assigned. If Program Counter (PC) is modified or a conditional test is true, the instruction requires two cycles. The second cycle is executed as a NOP. Some instructions are two-word instructions. The second word of these instructions will be executed as a NOP unless the first word of the instruction retrieves the information embedded in these 16-bits. This ensures that all program memory locations have a valid instruction. In normal execution modes, table write operations cannot be used to write to any on-chip memory space. For 80-pin devices, table write instructions may also be used to write to an external memory device. For more information, see Section 6.4 "Writing to Program Memory Space (PIC18F8XJ10/8XJ15 Devices Only)" and Section 6.6 "Writing and Erasing On-Chip Program Memory (ICSP Mode)".
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TABLE 24-2:
Mnemonic, Operands
PIC18F87J10 FAMILY INSTRUCTION SET (CONTINUED)
16-Bit Instruction Word Description Cycles MSb LSb Status Affected Notes
BIT-ORIENTED OPERATIONS BCF BSF BTFSC BTFSS BTG BC BN BNC BNN BNOV BNZ BOV BRA BZ CALL CLRWDT DAW GOTO NOP NOP POP PUSH RCALL RESET RETFIE RETLW RETURN SLEEP Note 1: f, b, a f, b, a f, b, a f, b, a f, b, a n n n n n n n n n n, s -- -- n -- -- -- -- n s k s -- Bit Clear f Bit Set f Bit Test f, Skip if Clear Bit Test f, Skip if Set Bit Toggle f Branch if Carry Branch if Negative Branch if Not Carry Branch if Not Negative Branch if Not Overflow Branch if Not Zero Branch if Overflow Branch Unconditionally Branch if Zero Call subroutine 1st word 2nd word Clear Watchdog Timer Decimal Adjust WREG Go to address 1st word 2nd word No Operation No Operation Pop top of return stack (TOS) Push top of return stack (TOS) Relative Call Software device Reset Return from interrupt enable Return with literal in WREG Return from Subroutine Go into Standby mode 1 1 1 (2 or 3) 1 (2 or 3) 1 1 (2) 1 (2) 1 (2) 1 (2) 1 (2) 1 (2) 1 (2) 2 1 (2) 2 1 1 2 1 1 1 1 2 1 2 2 2 1 1001 1000 1011 1010 0111 1110 1110 1110 1110 1110 1110 1110 1101 1110 1110 1111 0000 0000 1110 1111 0000 1111 0000 0000 1101 0000 0000 bbba bbba bbba bbba bbba 0010 0110 0011 0111 0101 0001 0100 0nnn 0000 110s kkkk 0000 0000 1111 kkkk 0000 xxxx 0000 0000 1nnn 0000 0000 ffff ffff ffff ffff ffff nnnn nnnn nnnn nnnn nnnn nnnn nnnn nnnn nnnn kkkk kkkk 0000 0000 kkkk kkkk 0000 xxxx 0000 0000 nnnn 1111 0001 kkkk 0001 0000 ffff ffff ffff ffff ffff nnnn nnnn nnnn nnnn nnnn nnnn nnnn nnnn nnnn kkkk kkkk 0100 0111 kkkk kkkk 0000 xxxx 0110 0101 nnnn 1111 000s None None None None None None None None None None None None None None None TO, PD C None 1, 2 1, 2 3, 4 3, 4 1, 2
CONTROL OPERATIONS
0000 1100 0000 0000 0000 0000
None None None None None All GIE/GIEH, PEIE/GIEL kkkk None 001s None 0011 TO, PD
4
2: 3: 4:
5:
When a port register is modified as a function of itself (e.g., MOVF PORTB, 1, 0), the value used will be that value present on the pins themselves. For example, if the data latch is `1' for a pin configured as input and is driven low by an external device, the data will be written back with a `0'. If this instruction is executed on the TMR0 register (and, where applicable, d = 1), the prescaler will be cleared if assigned. If Program Counter (PC) is modified or a conditional test is true, the instruction requires two cycles. The second cycle is executed as a NOP. Some instructions are two-word instructions. The second word of these instructions will be executed as a NOP unless the first word of the instruction retrieves the information embedded in these 16-bits. This ensures that all program memory locations have a valid instruction. In normal execution modes, table write operations cannot be used to write to any on-chip memory space. For 80-pin devices, table write instructions may also be used to write to an external memory device. For more information, see Section 6.4 "Writing to Program Memory Space (PIC18F8XJ10/8XJ15 Devices Only)" and Section 6.6 "Writing and Erasing On-Chip Program Memory (ICSP Mode)".
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TABLE 24-2:
Mnemonic, Operands LITERAL OPERATIONS ADDLW ANDLW IORLW LFSR MOVLB MOVLW MULLW RETLW SUBLW XORLW TBLRD* TBLRD*+ TBLRD*TBLRD+* TBLWT* TBLWT*+ TBLWT*TBLWT+* Note 1: k k k f, k k k k k k k Add literal and WREG AND literal with WREG Inclusive OR literal with WREG Move literal (12-bit) 2nd word to FSR(f) 1st word Move literal to BSR<3:0> Move literal to WREG Multiply literal with WREG Return with literal in WREG Subtract WREG from literal Exclusive OR literal with WREG 1 1 1 2 1 1 1 2 1 1 0000 0000 0000 1110 1111 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 1111 1011 1001 1110 0000 0001 1110 1101 1100 1000 1010 0000 0000 0000 0000 0000 0000 0000 0000 kkkk kkkk kkkk 00ff kkkk 0000 kkkk kkkk kkkk kkkk kkkk 0000 0000 0000 0000 0000 0000 0000 0000 kkkk kkkk kkkk kkkk kkkk kkkk kkkk kkkk kkkk kkkk kkkk 1000 1001 1010 1011 1100 1101 1110 1111 C, DC, Z, OV, N Z, N Z, N None None None None None C, DC, Z, OV, N Z, N None None None None None None None None
PIC18F87J10 FAMILY INSTRUCTION SET (CONTINUED)
16-Bit Instruction Word Description Cycles MSb LSb Status Affected Notes
DATA MEMORY PROGRAM MEMORY OPERATIONS Table Read 2 Table Read with post-increment Table Read with post-decrement Table Read with pre-increment Table Write 2 Table Write with post-increment Table Write with post-decrement Table Write with pre-increment
5 5 5 5
2: 3: 4:
5:
When a port register is modified as a function of itself (e.g., MOVF PORTB, 1, 0), the value used will be that value present on the pins themselves. For example, if the data latch is `1' for a pin configured as input and is driven low by an external device, the data will be written back with a `0'. If this instruction is executed on the TMR0 register (and, where applicable, d = 1), the prescaler will be cleared if assigned. If Program Counter (PC) is modified or a conditional test is true, the instruction requires two cycles. The second cycle is executed as a NOP. Some instructions are two-word instructions. The second word of these instructions will be executed as a NOP unless the first word of the instruction retrieves the information embedded in these 16-bits. This ensures that all program memory locations have a valid instruction. In normal execution modes, table write operations cannot be used to write to any on-chip memory space. For 80-pin devices, table write instructions may also be used to write to an external memory device. For more information, see Section 6.4 "Writing to Program Memory Space (PIC18F8XJ10/8XJ15 Devices Only)" and Section 6.6 "Writing and Erasing On-Chip Program Memory (ICSP Mode)".
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24.1.1 STANDARD INSTRUCTION SET
ADDLW Syntax: Operands: Operation: Status Affected: Encoding: Description:
ADD Literal to W ADDLW 0 k 255 (W) + k W N, OV, C, DC, Z 0000 1111 kkkk kkkk k
ADDWF Syntax: Operands:
ADD W to f ADDWF 0 f 255 d [0,1] a [0,1] (W) + (f) dest N, OV, C, DC, Z 0010 01da ffff ffff f {,d {,a}}
Operation: Status Affected: Encoding: Description:
The contents of W are added to the 8-bit literal `k' and the result is placed in W. 1 1
Words: Cycles: Q Cycle Activity: Q1 Decode
Add W to register `f'. If `d' is `0', the result is stored in W. If `d' is `1', the result is stored back in register `f' (default). If `a' is `0', the Access Bank is selected. If `a' is `1', the BSR is used to select the GPR bank (default). If `a' is `0' and the extended instruction set is enabled, this instruction operates in Indexed Literal Offset Addressing mode whenever f 95 (5Fh). See Section 24.2.3 "Byte-Oriented and Bit-Oriented Instructions in Indexed Literal Offset Mode" for details.
Q2 Read literal `k' ADDLW
Q3 Process Data 15h
Q4 Write to W
Example:
Before Instruction W = 10h After Instruction W= 25h
Words: Cycles: Q Cycle Activity: Q1 Decode
1 1 Q2 Read register `f' ADDWF 17h 0C2h 0D9h 0C2h Q3 Process Data REG, 0, 0 Q4 Write to destination
Example:
Before Instruction W = REG = After Instruction W = REG =
Note:
All PIC18 instructions may take an optional label argument preceding the instruction mnemonic for use in symbolic addressing. If a label is used, the instruction format then becomes: {label} instruction argument(s).
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ADDWFC Syntax: Operands: ADD W and Carry bit to f ADDWFC 0 f 255 d [0,1] a [0,1] (W) + (f) + (C) dest N,OV, C, DC, Z 0010 00da ffff ffff f {,d {,a}} ANDLW Syntax: Operands: Operation: Status Affected: Encoding: Description: Words: Cycles: Q Cycle Activity: Q1 Decode Q2 Read literal `k' ANDLW A3h 03h Q3 Process Data 05Fh Q4 Write to W AND Literal with W ANDLW 0 k 255 (W) .AND. k W N, Z 0000 1011 kkkk kkkk k
Operation: Status Affected: Encoding: Description:
The contents of W are ANDed with the 8-bit literal `k'. The result is placed in W. 1 1
Add W, the Carry flag and data memory location `f'. If `d' is `0', the result is placed in W. If `d' is `1', the result is placed in data memory location `f'. If `a' is `0', the Access Bank is selected. If `a' is `1', the BSR is used to select the GPR bank (default). If `a' is `0' and the extended instruction set is enabled, this instruction operates in Indexed Literal Offset Addressing mode whenever f 95 (5Fh). See Section 24.2.3 "Byte-Oriented and Bit-Oriented Instructions in Indexed Literal Offset Mode" for details.
Example:
Before Instruction W = After Instruction W =
Words: Cycles: Q Cycle Activity: Q1 Decode
1 1 Q2 Read register `f' ADDWFC 1 02h 4Dh 0 02h 50h Q3 Process Data REG, 0, 1 Q4 Write to destination
Example:
Before Instruction Carry bit = REG = W = After Instruction Carry bit = REG = W =
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ANDWF Syntax: Operands: AND W with f ANDWF 0 f 255 d [0,1] a [0,1] (W) .AND. (f) dest N, Z 0001 01da ffff ffff f {,d {,a}} BC Syntax: Operands: Operation: Status Affected: Encoding: Description: Branch if Carry BC n
-128 n 127 if Carry bit is `1' (PC) + 2 + 2n PC None 1110 0010 nnnn nnnn
Operation: Status Affected: Encoding: Description:
The contents of W are ANDed with register `f'. If `d' is `0', the result is stored in W. If `d' is `1', the result is stored back in register `f' (default). If `a' is `0', the Access Bank is selected. If `a' is `1', the BSR is used to select the GPR bank (default). If `a' is `0' and the extended instruction set is enabled, this instruction operates in Indexed Literal Offset Addressing mode whenever f 95 (5Fh). See Section 24.2.3 "Byte-Oriented and Bit-Oriented Instructions in Indexed Literal Offset Mode" for details. Words: Cycles: Q Cycle Activity: If Jump: Q1 Decode No operation If No Jump: Q2 Read register `f' ANDWF 17h C2h 02h C2h Q3 Process Data REG, 0, 0 Q4 Write to destination Q1 Decode
If the Carry bit is '1', then the program will branch. The 2's complement number `2n' is added to the PC. Since the PC will have incremented to fetch the next instruction, the new address will be PC + 2 + 2n. This instruction is then a two-cycle instruction. 1 1(2)
Q2 Read literal `n' No operation Q2 Read literal `n' HERE = = = = =
Q3 Process Data No operation Q3 Process Data BC 5
Q4 Write to PC No operation Q4 No operation
Words: Cycles: Q Cycle Activity: Q1 Decode
1 1
Example:
Example:
Before Instruction W = REG = After Instruction W = REG =
Before Instruction PC After Instruction If Carry PC If Carry PC
address (HERE) 1; address (HERE + 12) 0; address (HERE + 2)
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BCF Syntax: Operands: Bit Clear f BCF f, b {,a} BN Syntax: Operands: Operation: Status Affected: Encoding: bbba ffff ffff Description: Branch if Negative BN n
0 f 255 0b7 a [0,1] 0 f None 1001
-128 n 127 if Negative bit is `1' (PC) + 2 + 2n PC None 1110 0110 nnnn nnnn
Operation: Status Affected: Encoding: Description:
Bit `b' in register `f' is cleared. If `a' is `0', the Access Bank is selected. If `a' is `1', the BSR is used to select the GPR bank (default). If `a' is `0' and the extended instruction set is enabled, this instruction operates in Indexed Literal Offset Addressing mode whenever f 95 (5Fh). See Section 24.2.3 "Byte-Oriented and Bit-Oriented Instructions in Indexed Literal Offset Mode" for details.
If the Negative bit is `1', then the program will branch. The 2's complement number `2n' is added to the PC. Since the PC will have incremented to fetch the next instruction, the new address will be PC + 2 + 2n. This instruction is then a two-cycle instruction.
Words: Cycles: Q Cycle Activity: If Jump: Q1 Decode
1 1(2)
Words: Cycles: Q Cycle Activity: Q1 Decode
1 1 Q2 Read register `f' BCF Q3 Process Data FLAG_REG, Q4 Write register `f' 7, 0
Q2 Read literal `n' No operation Q2 Read literal `n' HERE = = = = =
Q3 Process Data No operation Q3 Process Data BN Jump
Q4 Write to PC No operation Q4 No operation
No operation If No Jump: Q1 Decode
Example:
Before Instruction FLAG_REG = C7h After Instruction FLAG_REG = 47h
Example:
Before Instruction PC After Instruction If Negative PC If Negative PC
address (HERE) 1; address (Jump) 0; address (HERE + 2)
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BNC Syntax: Operands: Operation: Status Affected: Encoding: Description: Branch if Not Carry BNC n BNN Syntax: Operands: Operation: Status Affected: 0011 nnnn nnnn Encoding: Description: Branch if Not Negative BNN n
-128 n 127 if Carry bit is `0' (PC) + 2 + 2n PC None 1110
-128 n 127 if Negative bit is `0' (PC) + 2 + 2n PC None 1110 0111 nnnn nnnn
If the Carry bit is `0', then the program will branch. The 2's complement number `2n' is added to the PC. Since the PC will have incremented to fetch the next instruction, the new address will be PC + 2 + 2n. This instruction is then a two-cycle instruction.
If the Negative bit is `0', then the program will branch. The 2's complement number `2n' is added to the PC. Since the PC will have incremented to fetch the next instruction, the new address will be PC + 2 + 2n. This instruction is then a two-cycle instruction.
Words: Cycles: Q Cycle Activity: If Jump: Q1 Decode No operation If No Jump: Q1 Decode
1 1(2)
Words: Cycles: Q Cycle Activity: If Jump: Q2 Q3 Process Data No operation Q3 Process Data BNC Jump Q4 Write to PC No operation Q4 No operation Q1 Decode No operation If No Jump: Q2 Q1 Decode
1 1(2)
Q2 Read literal `n' No operation Q2 Read literal `n' HERE = = = = =
Q3 Process Data No operation Q3 Process Data BNN Jump
Q4 Write to PC No operation Q4 No operation
Read literal `n' No operation
Read literal `n' HERE = = = = =
Example:
Example:
Before Instruction PC After Instruction If Carry PC If Carry PC
address (HERE) 0; address (Jump) 1; address (HERE + 2)
Before Instruction PC After Instruction If Negative PC If Negative PC
address (HERE) 0; address (Jump) 1; address (HERE + 2)
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BNOV Syntax: Operands: Operation: Status Affected: Encoding: Description: Branch if Not Overflow BNOV n BNZ Syntax: Operands: Operation: Status Affected: 0101 nnnn nnnn Encoding: Description: Branch if Not Zero BNZ n
-128 n 127 if Overflow bit is `0' (PC) + 2 + 2n PC None 1110
-128 n 127 if Zero bit is `0' (PC) + 2 + 2n PC None 1110 0001 nnnn nnnn
If the Overflow bit is `0', then the program will branch. The 2's complement number `2n' is added to the PC. Since the PC will have incremented to fetch the next instruction, the new address will be PC + 2 + 2n. This instruction is then a two-cycle instruction.
If the Zero bit is `0', then the program will branch. The 2's complement number `2n' is added to the PC. Since the PC will have incremented to fetch the next instruction, the new address will be PC + 2 + 2n. This instruction is then a two-cycle instruction.
Words: Cycles: Q Cycle Activity: If Jump: Q1 Decode No operation If No Jump: Q1 Decode
1 1(2)
Words: Cycles: Q Cycle Activity: If Jump: Q2 Q3 Process Data No operation Q3 Process Data BNOV Jump address (HERE) 0; address (Jump) 1; address (HERE + 2) Q4 Write to PC No operation Q4 No operation Q1 Decode No operation If No Jump: Q2 Q1 Decode
1 1(2)
Q2 Read literal `n' No operation Q2 Read literal `n' HERE = = = = =
Q3 Process Data No operation Q3 Process Data BNZ Jump
Q4 Write to PC No operation Q4 No operation
Read literal `n' No operation
Read literal `n' HERE = = = = =
Example:
Example:
Before Instruction PC After Instruction If Overflow PC If Overflow PC
Before Instruction PC After Instruction If Zero PC If Zero PC
address (HERE) 0; address (Jump) 1; address (HERE + 2)
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BRA Syntax: Operands: Operation: Status Affected: Encoding: Description: Unconditional Branch BRA n BSF Syntax: Operands: Bit Set f BSF f, b {,a}
-1024 n 1023 (PC) + 2 + 2n PC None 1101 0nnn nnnn nnnn
0 f 255 0b7 a [0,1] 1 f None 1000 bbba ffff ffff
Operation: Status Affected: Encoding: Description:
Add the 2's complement number `2n' to the PC. Since the PC will have incremented to fetch the next instruction, the new address will be PC + 2 + 2n. This instruction is a two-cycle instruction. 1 2
Bit `b' in register `f' is set. If `a' is `0', the Access Bank is selected. If `a' is `1', the BSR is used to select the GPR bank (default). If `a' is `0' and the extended instruction set is enabled, this instruction operates in Indexed Literal Offset Addressing mode whenever f 95 (5Fh). See Section 24.2.3 "Byte-Oriented and Bit-Oriented Instructions in Indexed Literal Offset Mode" for details.
Words: Cycles: Q Cycle Activity: Q1 Decode No operation
Q2 Read literal `n' No operation
Q3 Process Data No operation
Q4 Write to PC No operation Words: Cycles: Q Cycle Activity:
1 1 Q1 Decode Q2 Read register `f' BSF = = Q3 Process Data Q4 Write register `f'
Example:
HERE = =
BRA
Jump
Before Instruction PC After Instruction PC
address (HERE) address (Jump) Example:
FLAG_REG, 7, 1 0Ah 8Ah
Before Instruction FLAG_REG After Instruction FLAG_REG
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BTFSC Syntax: Operands: Bit Test File, Skip if Clear BTFSC f, b {,a} 0 f 255 0b7 a [0,1] skip if (f) = 0 None 1011 bbba ffff ffff BTFSS Syntax: Operands: Bit Test File, Skip if Set BTFSS f, b {,a} 0 f 255 0b<7 a [0,1] skip if (f) = 1 None 1010 bbba ffff ffff
Operation: Status Affected: Encoding: Description:
Operation: Status Affected: Encoding: Description:
If bit `b' in register `f' is `0', then the next instruction is skipped. If bit `b' is `0', then the next instruction fetched during the current instruction execution is discarded and a NOP is executed instead, making this a two-cycle instruction. If `a' is `0', the Access Bank is selected. If `a' is `1', the BSR is used to select the GPR bank (default). If `a' is `0' and the extended instruction set is enabled, this instruction operates in Indexed Literal Offset Addressing mode whenever f 95 (5Fh). See Section 24.2.3 "Byte-Oriented and Bit-Oriented Instructions in Indexed Literal Offset Mode" for details.
If bit `b' in register `f' is `1', then the next instruction is skipped. If bit `b' is `1', then the next instruction fetched during the current instruction execution is discarded and a NOP is executed instead, making this a two-cycle instruction. If `a' is `0', the Access Bank is selected. If `a' is `1', the BSR is used to select the GPR bank (default). If `a' is `0' and the extended instruction set is enabled, this instruction operates in Indexed Literal Offset Addressing mode whenever f 95 (5Fh). See Section 24.2.3 "Byte-Oriented and Bit-Oriented Instructions in Indexed Literal Offset Mode" for details.
Words: Cycles:
1 1(2) Note: 3 cycles if skip and followed by a 2-word instruction.
Words: Cycles:
1 1(2) Note: 3 cycles if skip and followed by a 2-word instruction. Q3 Process Data Q3 No operation Q3 No operation No operation BTFSS : : Q4 No operation Q4 No operation Q4 No operation No operation
Q Cycle Activity: Q1 Decode If skip: Q1 No operation Q1 No operation No operation Example: Q2 No operation Q2 No operation No operation HERE FALSE TRUE = = = = = Q3 No operation Q3 No operation No operation BTFSC : : Q4 No operation Q4 No operation No operation Q2 Read register `f' Q3 Process Data Q4 No operation
Q Cycle Activity: Q1 Decode If skip: Q1 No operation Q1 No operation No operation Example: Q2 No operation Q2 No operation No operation HERE FALSE TRUE = = = = = Q2 Read register `f'
If skip and followed by 2-word instruction:
If skip and followed by 2-word instruction:
FLAG, 1, 0
FLAG, 1, 0
Before Instruction PC After Instruction If FLAG<1> PC If FLAG<1> PC
address (HERE) 0; address (TRUE) 1; address (FALSE)
Before Instruction PC After Instruction If FLAG<1> PC If FLAG<1> PC
address (HERE) 0; address (FALSE) 1; address (TRUE)
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BTG Syntax: Operands: Bit Toggle f BTG f, b {,a} 0 f 255 0b<7 a [0,1] (f) f None 0111 bbba ffff ffff BOV Syntax: Operands: Operation: Status Affected: Encoding: Description: Branch if Overflow BOV n
-128 n 127 if Overflow bit is `1' (PC) + 2 + 2n PC None 1110 0100 nnnn nnnn
Operation: Status Affected: Encoding: Description:
Bit `b' in data memory location `f' is inverted. If `a' is `0', the Access Bank is selected. If `a' is `1', the BSR is used to select the GPR bank (default). If `a' is `0' and the extended instruction set is enabled, this instruction operates in Indexed Literal Offset Addressing mode whenever f 95 (5Fh). See Section 24.2.3 "Byte-Oriented and Bit-Oriented Instructions in Indexed Literal Offset Mode" for details.
If the Overflow bit is `1', then the program will branch. The 2's complement number `2n' is added to the PC. Since the PC will have incremented to fetch the next instruction, the new address will be PC + 2 + 2n. This instruction is then a two-cycle instruction.
Words: Cycles: Q Cycle Activity: If Jump: Q1 Decode No operation If No Jump: Q1 Decode
1 1(2)
Words: Cycles: Q Cycle Activity: Q1 Decode
1 1 Q2 Read register `f' BTG Q3 Process Data PORTC, 4, 0 Example: Q4 Write register `f'
Q2 Read literal `n' No operation Q2 Read literal `n' HERE = = = = =
Q3 Process Data No operation Q3 Process Data BOV Jump
Q4 Write to PC No operation Q4 No operation
Example:
Before Instruction: PORTC = 0111 0101 [75h] After Instruction: PORTC = 0110 0101 [65h]
Before Instruction PC After Instruction If Overflow PC If Overflow PC
address (HERE) 1; address (Jump) 0; address (HERE + 2)
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BZ Syntax: Operands: Operation: Status Affected: Encoding: Description: Branch if Zero BZ n CALL Syntax: Operands: Operation: Subroutine Call CALL k {,s} 0 k 1048575 s [0,1] (PC) + 4 TOS, k PC<20:1>, if s = 1 (W) WS, (STATUS) STATUSS, (BSR) BSRS None 1110 1111 110s k19kkk k7kkk kkkk kkkk0 kkkk8
-128 n 127 if Zero bit is `1' (PC) + 2 + 2n PC None 1110 0000 nnnn nnnn
If the Zero bit is `1', then the program will branch. The 2's complement number `2n' is added to the PC. Since the PC will have incremented to fetch the next instruction, the new address will be PC + 2 + 2n. This instruction is then a two-cycle instruction. Status Affected: Encoding: 1st word (k<7:0>) 2nd word(k<19:8>) Description:
Words: Cycles: Q Cycle Activity: If Jump: Q1 Decode No operation If No Jump: Q1 Decode
1 1(2)
Q2 Read literal `n' No operation Q2 Read literal `n' HERE = = = = =
Q3 Process Data No operation Q3 Process Data BZ Jump
Q4 Write to PC No operation Q4 No operation Words: Cycles: Q Cycle Activity: Q1 Decode
Subroutine call of entire 2-Mbyte memory range. First, return address (PC+ 4) is pushed onto the return stack. If `s' = 1, the W, STATUS and BSR registers are also pushed into their respective shadow registers, WS, STATUSS and BSRS. If `s' = 0, no update occurs (default). Then, the 20-bit value `k' is loaded into PC<20:1>. CALL is a two-cycle instruction. 2 2 Q2 Read literal `k'<7:0>, No operation HERE Q3 Push PC to stack No operation CALL Q4 Read literal 'k'<19:8>, Write to PC No operation
Example:
Before Instruction PC After Instruction If Zero PC If Zero PC
No operation Example:
address (HERE) 1; address (Jump) 0; address (HERE + 2) THERE,1
Before Instruction PC = After Instruction PC = TOS = WS = BSRS = STATUSS =
address (HERE) address (THERE) address (HERE + 4) W BSR STATUS
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CLRF Syntax: Operands: Operation: Status Affected: Encoding: Description: Clear f CLRF f {,a} CLRWDT Syntax: Operands: Operation: Clear Watchdog Timer CLRWDT None 000h WDT, 000h WDT postscaler, 1 TO, 1 PD TO, PD 0000 0000 0000 0100
0 f 255 a [0,1] 000h f 1Z Z 0110 101a ffff ffff
Status Affected: Encoding: Description:
Clears the contents of the specified register. If `a' is `0', the Access Bank is selected. If `a' is `1', the BSR is used to select the GPR bank (default). If `a' is `0' and the extended instruction set is enabled, this instruction operates in Indexed Literal Offset Addressing mode whenever f 95 (5Fh). See Section 24.2.3 "Byte-Oriented and Bit-Oriented Instructions in Indexed Literal Offset Mode" for details.
CLRWDT instruction resets the Watchdog Timer. It also resets the postscaler of the WDT. Status bits, TO and PD, are set. 1 1
Words: Cycles: Q Cycle Activity: Q1 Decode
Q2 No operation CLRWDT = = = = = ?
Q3 Process Data
Q4 No operation
Words: Cycles: Q Cycle Activity: Q1 Decode
1 1 Q2 Read register `f' CLRF = = 5Ah 00h Q3 Process Data FLAG_REG,1 Q4 Write register `f' Example: Before Instruction WDT Counter After Instruction WDT Counter WDT Postscaler TO PD
Example:
00h 0 1 1
Before Instruction FLAG_REG After Instruction FLAG_REG
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COMF Syntax: Operands: Complement f COMF f {,d {,a}} CPFSEQ Syntax: Operands: Operation: Compare f with W, Skip if f = W CPFSEQ 0 f 255 a [0,1] (f) - (W), skip if (f) = (W) (unsigned comparison) None 0110 001a ffff ffff Compares the contents of data memory location `f' to the contents of W by performing an unsigned subtraction. If `f' = W, then the fetched instruction is discarded and a NOP is executed instead, making this a two-cycle instruction. If `a' is `0', the Access Bank is selected. If `a' is `1', the BSR is used to select the GPR bank (default). If `a' is `0' and the extended instruction set is enabled, this instruction operates in Indexed Literal Offset Addressing mode whenever f 95 (5Fh). See Section 24.2.3 "Byte-Oriented and Bit-Oriented Instructions in Indexed Literal Offset Mode" for details. Words: Cycles: 1 1(2) Note: 3 cycles if skip and followed by a 2-word instruction. Q2 Read register `f' Q3 Process Data Q4 No operation Q4 No operation Q4 No operation No operation f {,a}
0 f 255 d [0,1] a [0,1]
Operation: Status Affected: Encoding: Description:
( f ) dest
N, Z 0001 11da ffff ffff Status Affected: Encoding: Description:
The contents of register `f' are complemented. If `d' is `0', the result is stored in W. If `d' is `1', the result is stored back in register `f' (default). If `a' is `0', the Access Bank is selected. If `a' is `1', the BSR is used to select the GPR bank (default). If `a' is `0' and the extended instruction set is enabled, this instruction operates in Indexed Literal Offset Addressing mode whenever f 95 (5Fh). See Section 24.2.3 "Byte-Oriented and Bit-Oriented Instructions in Indexed Literal Offset Mode" for details.
Words: Cycles: Q Cycle Activity: Q1 Decode
1 1 Q2 Read register `f' COMF 13h 13h ECh Q3 Process Data REG, 0, 0 Q4 Write to destination
Example:
Before Instruction REG = After Instruction REG = W =
Q Cycle Activity: Q1 Decode If skip:
Q1 Q2 Q3 No No No operation operation operation If skip and followed by 2-word instruction: Q1 Q2 Q3 No No No operation operation operation No No No operation operation operation Example: HERE NEQUAL EQUAL = = = = = =
CPFSEQ REG, 0 : : HERE ? ? W; Address (EQUAL) W; Address (NEQUAL)
Before Instruction PC Address W REG After Instruction If REG PC If REG PC
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CPFSGT Syntax: Operands: Operation: Compare f with W, Skip if f > W CPFSGT 0 f 255 a [0,1] (f) - (W), skip if (f) > (W) (unsigned comparison) None 0110 010a ffff ffff Compares the contents of data memory location `f' to the contents of the W by performing an unsigned subtraction. If the contents of `f' are greater than the contents of WREG, then the fetched instruction is discarded and a NOP is executed instead, making this a two-cycle instruction. If `a' is `0', the Access Bank is selected. If `a' is `1', the BSR is used to select the GPR bank (default). If `a' is `0' and the extended instruction set is enabled, this instruction operates in Indexed Literal Offset Addressing mode whenever f 95 (5Fh). See Section 24.2.3 "Byte-Oriented and Bit-Oriented Instructions in Indexed Literal Offset Mode" for details. Words: Cycles: 1 1(2) Note: 3 cycles if skip and followed by a 2-word instruction. Q3 Process Data Q4 No operation Q4 No operation Q4 No operation No operation Words: Cycles: f {,a} CPFSLT Syntax: Operands: Operation: Compare f with W, Skip if f < W CPFSLT 0 f 255 a [0,1] (f) - (W), skip if (f) < (W) (unsigned comparison) None 0110 000a ffff ffff f {,a}
Status Affected: Encoding: Description:
Status Affected: Encoding: Description:
Compares the contents of data memory location `f' to the contents of W by performing an unsigned subtraction. If the contents of `f' are less than the contents of W, then the fetched instruction is discarded and a NOP is executed instead, making this a two-cycle instruction. If `a' is `0', the Access Bank is selected. If `a' is `1', the BSR is used to select the GPR bank (default). 1 1(2) Note: 3 cycles if skip and followed by a 2-word instruction.
Q Cycle Activity: Q1 Decode If skip: Q1 No operation Q1 No operation No operation Example: Q2 No operation Q2 No operation No operation HERE NLESS LESS = = < = = Q3 No operation Q3 No operation No operation Q4 No operation Q4 No operation No operation Q2 Read register `f' Q3 Process Data Q4 No operation
Q Cycle Activity: Q1 Decode If skip:
Q2 Read register `f'
If skip and followed by 2-word instruction:
Q1 Q2 Q3 No No No operation operation operation If skip and followed by 2-word instruction: Q1 Q2 Q3 No No No operation operation operation No No No operation operation operation Example: HERE NGREATER GREATER = = > = =
CPFSLT REG, 1 : : Address (HERE) ? W; Address (LESS) W; Address (NLESS)
CPFSGT REG, 0 : :
Before Instruction PC W After Instruction If REG PC If REG PC
Address (HERE) ? W; Address (GREATER) W; Address (NGREATER)
Before Instruction PC W After Instruction If REG PC If REG PC
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DAW Syntax: Operands: Operation: Decimal Adjust W Register DAW None If [W<3:0> > 9] or [DC = 1] then (W<3:0>) + 6 W<3:0>; else (W<3:0>) W<3:0> If [W<7:4> > 9] or [C = 1] then (W<7:4>) + 6 W<7:4>; C = 1; else (W<7:4>) W<7:4> Status Affected: Encoding: Description: C 0000 0000 0000 0111 DECF Syntax: Operands: Decrement f DECF f {,d {,a}} 0 f 255 d [0,1] a [0,1] (f) - 1 dest C, DC, N, OV, Z 0000 01da ffff ffff
Operation: Status Affected: Encoding: Description:
Decrement register `f'. If `d' is `0', the result is stored in W. If `d' is `1', the result is stored back in register `f' (default). If `a' is `0', the Access Bank is selected. If `a' is `1', the BSR is used to select the GPR bank (default). If `a' is `0' and the extended instruction set is enabled, this instruction operates in Indexed Literal Offset Addressing mode whenever f 95 (5Fh). See Section 24.2.3 "Byte-Oriented and Bit-Oriented Instructions in Indexed Literal Offset Mode" for details.
DAW adjusts the eight-bit value in W, resulting from the earlier addition of two variables (each in packed BCD format) and produces a correct packed BCD result. 1 1 Words: Q2 Read register W DAW A5h 0 0 05h 1 0 Q3 Process Data Q4 Write W Cycles: Q Cycle Activity: Q1 Decode
Words: Cycles: Q Cycle Activity: Q1 Decode
1 1 Q2 Read register `f' DECF 01h 0 00h 1 Q3 Process Data CNT, 1, 0 Q4 Write to destination
Example 1:
Before Instruction W = C = DC = After Instruction W = C = DC = Example 2: Before Instruction W = C = DC = After Instruction W = C = DC =
Example:
Before Instruction CNT = Z = After Instruction CNT = Z =
CEh 0 0 34h 1 0
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DECFSZ Syntax: Operands: Decrement f, Skip if 0 DECFSZ f {,d {,a}} 0 f 255 d [0,1] a [0,1] (f) - 1 dest, skip if result = 0 None 0010 11da ffff ffff DCFSNZ Syntax: Operands: Decrement f, Skip if not 0 DCFSNZ 0 f 255 d [0,1] a [0,1] (f) - 1 dest, skip if result 0 None 0100 11da ffff ffff f {,d {,a}}
Operation: Status Affected: Encoding: Description:
Operation: Status Affected: Encoding: Description:
The contents of register `f' are decremented. If `d' is `0', the result is placed in W. If `d' is `1', the result is placed back in register `f' (default). If the result is `0', the next instruction which is already fetched is discarded and a NOP is executed instead, making it a two-cycle instruction. If `a' is `0', the Access Bank is selected. If `a' is `1', the BSR is used to select the GPR bank (default). If `a' is `0' and the extended instruction set is enabled, this instruction operates in Indexed Literal Offset Addressing mode whenever f 95 (5Fh). See Section 24.2.3 "Byte-Oriented and Bit-Oriented Instructions in Indexed Literal Offset Mode" for details.
The contents of register `f' are decremented. If `d' is `0', the result is placed in W. If `d' is `1', the result is placed back in register `f' (default). If the result is not `0', the next instruction which is already fetched is discarded and a NOP is executed instead, making it a two-cycle instruction. If `a' is `0', the Access Bank is selected. If `a' is `1', the BSR is used to select the GPR bank (default). If `a' is `0' and the extended instruction set is enabled, this instruction operates in Indexed Literal Offset Addressing mode whenever f 95 (5Fh). See Section 24.2.3 "Byte-Oriented and Bit-Oriented Instructions in Indexed Literal Offset Mode" for details.
Words: Cycles:
1 1(2) Note: 3 cycles if skip and followed by a 2-word instruction. Q1 Decode Q2 Read register `f' Q2 No operation Q2 No operation No operation HERE CONTINUE Q3 Process Data Q3 No operation Q3 No operation No operation DECFSZ GOTO Q4 Write to destination Q4 No operation Q4 No operation No operation CNT, 1, 1 LOOP If skip: Q1 No operation Q1 No operation No operation Example: Words: Cycles:
1 1(2) Note: 3 cycles if skip and followed by a 2-word instruction. Q3 Process Data Q3 No operation Q3 No operation No operation DCFSNZ : : = = = = = ? TEMP - 1, 0; Address (ZERO) 0; Address (NZERO) Q4 Write to destination Q4 No operation Q4 No operation No operation
Q Cycle Activity: Q Cycle Activity: Q1 Decode Q2
If skip: Q1 No operation Q1 No operation No operation Example:
Read register `f' Q2 No operation Q2 No operation No operation HERE ZERO NZERO
If skip and followed by 2-word instruction:
If skip and followed by 2-word instruction:
TEMP, 1, 0
Before Instruction PC = After Instruction CNT = If CNT = PC = If CNT PC =
Address (HERE) CNT - 1 0; Address (CONTINUE) 0; Address (HERE + 2)
Before Instruction TEMP After Instruction TEMP If TEMP PC If TEMP PC
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GOTO Syntax: Operands: Operation: Status Affected: Encoding: 1st word (k<7:0>) 2nd word(k<19:8>) Description: Unconditional Branch GOTO k 0 k 1048575 k PC<20:1> None 1110 1111 1111 k19kkk k7kkk kkkk kkkk0 kkkk8 Operation: Status Affected: Encoding: Description: INCF Syntax: Operands: Increment f INCF f {,d {,a}}
0 f 255 d [0,1] a [0,1] (f) + 1 dest C, DC, N, OV, Z 0010 10da ffff ffff
GOTO allows an unconditional branch anywhere within entire 2-Mbyte memory range. The 20-bit value `k' is loaded into PC<20:1>. GOTO is always a two-cycle instruction. 2 2
The contents of register `f' are incremented. If `d' is `0', the result is placed in W. If `d' is `1', the result is placed back in register `f' (default). If `a' is `0', the Access Bank is selected. If `a' is `1', the BSR is used to select the GPR bank (default). If `a' is `0' and the extended instruction set is enabled, this instruction operates in Indexed Literal Offset Addressing mode whenever f 95 (5Fh). See Section 24.2.3 "Byte-Oriented and Bit-Oriented Instructions in Indexed Literal Offset Mode" for details.
Words: Cycles: Q Cycle Activity: Q1 Decode
Q2 Read literal `k'<7:0>, No operation
Q3 No operation No operation
Q4 Read literal `k'<19:8>, Write to PC No operation Words: Cycles:
No operation Example:
1 1 Q1 Decode Q2 Read register `f' INCF FFh 0 ? ? 00h 1 1 1 Q3 Process Data CNT, 1, 0 Q4 Write to destination
GOTO THERE Q Cycle Activity:
After Instruction PC = Address (THERE)
Example:
Before Instruction CNT = Z = C = DC = After Instruction CNT = Z = C = DC =
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INCFSZ Syntax: Operands: Increment f, Skip if 0 INCFSZ 0 f 255 d [0,1] a [0,1] (f) + 1 dest, skip if result = 0 None 0011 11da ffff ffff f {,d {,a}} INFSNZ Syntax: Operands: Increment f, Skip if not 0 INFSNZ 0 f 255 d [0,1] a [0,1] (f) + 1 dest, skip if result 0 None 0100 10da ffff ffff The contents of register `f' are incremented. If `d' is `0', the result is placed in W. If `d' is `1', the result is placed back in register `f' (default). If the result is not `0', the next instruction which is already fetched is discarded and a NOP is executed instead, making it a two-cycle instruction. If `a' is `0', the Access Bank is selected. If `a' is `1', the BSR is used to select the GPR bank (default). If `a' is `0' and the extended instruction set is enabled, this instruction operates in Indexed Literal Offset Addressing mode whenever f 95 (5Fh). See Section 24.2.3 "Byte-Oriented and Bit-Oriented Instructions in Indexed Literal Offset Mode" for details. Words: Cycles: 3 cycles if skip and followed by a 2-word instruction. Q Cycle Activity: Q2 Read register `f' Q2 No operation Q2 No operation No operation HERE NZERO ZERO Q3 Process Data Q3 No operation Q3 No operation No operation INCFSZ : : Q4 Write to destination If skip: Q1 No operation Q1 No operation No operation Example: Q4 No operation Q4 No operation No operation CNT, 1, 0 Q1 No operation Q1 No operation No operation Example: Q2 No operation Q2 No operation No operation HERE ZERO NZERO Q3 No operation Q3 No operation No operation INFSNZ Q4 No operation Q4 No operation No operation Q1 Decode Q2 Read register `f' Q3 Process Data Q4 Write to destination 1 1(2) Note: 3 cycles if skip and followed by a 2-word instruction. f {,d {,a}}
Operation: Status Affected: Encoding: Description:
Operation: Status Affected: Encoding: Description:
The contents of register `f' are incremented. If `d' is `0', the result is placed in W. If `d' is `1', the result is placed back in register `f'. (default) If the result is `0', the next instruction which is already fetched is discarded and a NOP is executed instead, making it a two-cycle instruction. If `a' is `0', the Access Bank is selected. If `a' is `1', the BSR is used to select the GPR bank (default). If `a' is `0' and the extended instruction set is enabled, this instruction operates in Indexed Literal Offset Addressing mode whenever f 95 (5Fh). See Section 24.2.3 "Byte-Oriented and Bit-Oriented Instructions in Indexed Literal Offset Mode" for details.
Words: Cycles:
1 1(2) Note:
Q Cycle Activity: Q1 Decode If skip:
If skip and followed by 2-word instruction:
If skip and followed by 2-word instruction:
REG, 1, 0
Before Instruction PC = After Instruction CNT = If CNT = PC = If CNT PC =
Address (HERE) CNT + 1 0; Address (ZERO) 0; Address (NZERO)
Before Instruction PC = After Instruction REG = If REG PC = If REG = PC =
Address (HERE) REG + 1 0; Address (NZERO) 0; Address (ZERO)
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IORLW Syntax: Operands: Operation: Status Affected: Encoding: Description: Inclusive OR Literal with W IORLW k 0 k 255 (W) .OR. k W N, Z 0000 1001 kkkk kkkk Operation: Status Affected: Encoding: Description: IORWF Syntax: Operands: Inclusive OR W with f IORWF f {,d {,a}}
0 f 255 d [0,1] a [0,1] (W) .OR. (f) dest N, Z 0001 00da ffff ffff
The contents of W are ORed with the eight-bit literal `k'. The result is placed in W. 1 1
Words: Cycles: Q Cycle Activity: Q1 Decode
Inclusive OR W with register `f'. If `d' is `0', the result is placed in W. If `d' is `1', the result is placed back in register `f' (default). If `a' is `0', the Access Bank is selected. If `a' is `1', the BSR is used to select the GPR bank (default). If `a' is `0' and the extended instruction set is enabled, this instruction operates in Indexed Literal Offset Addressing mode whenever f 95 (5Fh). See Section 24.2.3 "Byte-Oriented and Bit-Oriented Instructions in Indexed Literal Offset Mode" for details.
Q2 Read literal `k' IORLW 9Ah BFh
Q3 Process Data 35h
Q4 Write to W
Example:
Before Instruction W = After Instruction W =
Words: Cycles: Q Cycle Activity: Q1 Decode
1 1 Q2 Read register `f' IORWF 13h 91h 13h 93h Q3 Process Data RESULT, 0, 1 Q4 Write to destination
Example:
Before Instruction RESULT = W = After Instruction RESULT = W =
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LFSR Syntax: Operands: Operation: Status Affected: Encoding: Description: Words: Cycles: Q Cycle Activity: Q1 Decode Q2 Read literal `k' MSB Q3 Process Data Q4 Write literal `k' MSB to FSRfH Write literal `k' to FSRfL Load FSR LFSR f, k 0f2 0 k 4095 k FSRf None 1110 1111 1110 0000 00ff k7kkk k11kkk kkkk Operation: Status Affected: Encoding: Description: MOVF Syntax: Operands: Move f MOVF f {,d {,a}}
0 f 255 d [0,1] a [0,1] f dest N, Z 0101 00da ffff ffff
The 12-bit literal `k' is loaded into the file select register pointed to by `f'. 2 2
The contents of register `f' are moved to a destination dependent upon the status of `d'. If `d' is `0', the result is placed in W. If `d' is `1', the result is placed back in register `f' (default). Location `f' can be anywhere in the 256-byte bank. If `a' is `0', the Access Bank is selected. If `a' is `1', the BSR is used to select the GPR bank (default). If `a' is `0' and the extended instruction set is enabled, this instruction operates in Indexed Literal Offset Addressing mode whenever f 95 (5Fh). See Section 24.2.3 "Byte-Oriented and Bit-Oriented Instructions in Indexed Literal Offset Mode" for details.
Decode
Read literal `k' LSB
Process Data
Example: After Instruction FSR2H FSR2L
LFSR 2, 3ABh = = 03h ABh
Words: Cycles: Q Cycle Activity: Q1 Decode
1 1 Q2 Read register `f' MOVF = = = = Q3 Process Data REG, 0, 0 22h FFh 22h 22h Q4 Write W
Example:
Before Instruction REG W After Instruction REG W
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MOVFF Syntax: Operands: Operation: Status Affected: Encoding: 1st word (source) 2nd word (destin.) Description: Move f to f MOVFF fs,fd 0 fs 4095 0 fd 4095 (fs) fd None 1100 1111 ffff ffff ffff ffff ffffs ffffd MOVLB Syntax: Operands: Operation: Status Affected: Encoding: Description: Move Literal to Low Nibble in BSR MOVLW k 0 k 255 k BSR None 0000 0001 kkkk kkkk
The contents of source register `fs' are moved to destination register `fd'. Location of source `fs' can be anywhere in the 4096-byte data space (000h to FFFh) and location of destination `fd' can also be anywhere from 000h to FFFh. Either source or destination can be W (a useful special situation). MOVFF is particularly useful for transferring a data memory location to a peripheral register (such as the transmit buffer or an I/O port). The MOVFF instruction cannot use the PCL, TOSU, TOSH or TOSL as the destination register
The eight-bit literal `k' is loaded into the Bank Select Register (BSR). The value of BSR<7:4> always remains `0' regardless of the value of k7:k4. 1 1
Words: Cycles: Q Cycle Activity: Q1 Decode
Q2 Read literal `k' MOVLB 02h 05h
Q3 Process Data 5
Q4 Write literal `k' to BSR
Example:
Before Instruction BSR Register = After Instruction BSR Register =
Words: Cycles: Q Cycle Activity: Q1 Decode
2 2 (3) Q2 Read register `f' (src) No operation No dummy read Q3 Process Data No operation Q4 No operation Write register `f' (dest)
Decode
Example:
MOVFF = = = =
REG1, REG2 33h 11h 33h 33h
Before Instruction REG1 REG2 After Instruction REG1 REG2
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MOVLW Syntax: Operands: Operation: Status Affected: Encoding: Description: Words: Cycles: Q Cycle Activity: Q1 Decode Q2 Read literal `k' MOVLW 5Ah Words: Cycles: Q Cycle Activity: Q1 Decode Q2 Read register `f' MOVWF 4Fh FFh 4Fh 4Fh Q3 Process Data REG, 0 Q4 Write register `f' Q3 Process Data 5Ah Q4 Write to W Move Literal to W MOVLW k 0 k 255 kW None 0000 1110 kkkk kkkk Operation: Status Affected: Encoding: Description: MOVWF Syntax: Operands: Move W to f MOVWF 0 f 255 a [0,1] (W) f None 0110 111a ffff ffff f {,a}
The eight-bit literal `k' is loaded into W. 1 1
Move data from W to register `f'. Location `f' can be anywhere in the 256-byte bank. If `a' is `0', the Access Bank is selected. If `a' is `1', the BSR is used to select the GPR bank (default). If `a' is `0' and the extended instruction set is enabled, this instruction operates in Indexed Literal Offset Addressing mode whenever f 95 (5Fh). See Section 24.2.3 "Byte-Oriented and Bit-Oriented Instructions in Indexed Literal Offset Mode" for details. 1 1
Example: After Instruction W =
Example:
Before Instruction W = REG = After Instruction W = REG =
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MULLW Syntax: Operands: Operation: Status Affected: Encoding: Description: Multiply Literal with W MULLW k MULWF Syntax: Operands: Operation: 1101 kkkk kkkk Status Affected: Encoding: Description: Multiply W with f MULWF 0 f 255 a [0,1] (W) x (f) PRODH:PRODL None 0000 001a ffff ffff f {,a}
0 k 255 (W) x k PRODH:PRODL None 0000
An unsigned multiplication is carried out between the contents of W and the 8-bit literal `k'. The 16-bit result is placed in PRODH:PRODL register pair. PRODH contains the high byte. W is unchanged. None of the status flags are affected. Note that neither Overflow nor Carry is possible in this operation. A Zero result is possible but not detected.
An unsigned multiplication is carried out between the contents of W and the register file location `f'. The 16-bit result is stored in the PRODH:PRODL register pair. PRODH contains the high byte. Both W and `f' are unchanged. None of the status flags are affected. Note that neither Overflow nor Carry is possible in this operation. A Zero result is possible but not detected. If `a' is `0', the Access Bank is selected. If `a' is `1', the BSR is used to select the GPR bank (default).
Words: Cycles: Q Cycle Activity: Q1 Decode
1 1 Q2 Read literal `k' Q3 Process Data Q4 Write registers PRODH: PRODL
Example: Before Instruction W PRODH PRODL After Instruction W PRODH PRODL
If `a' is `0' and the extended instruction set is enabled, this instruction operates in Indexed Literal Offset Addressing mode whenever f 95 (5Fh). See Section 24.2.3 "Byte-Oriented and Bit-Oriented Instructions in Indexed Literal Offset Mode" for details. Words: 1 1 Q1 Decode Q2 Read register `f' Q3 Process Data Q4 Write registers PRODH: PRODL
MULLW = = = = = =
0C4h E2h ? ? E2h ADh 08h Cycles: Q Cycle Activity:
Example: Before Instruction W REG PRODH PRODL After Instruction W REG PRODH PRODL
MULWF = = = = = = = =
REG, 1 C4h B5h ? ? C4h B5h 8Ah 94h
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NEGF Syntax: Operands: Operation: Status Affected: Encoding: Description: Negate f NEGF f {,a} NOP Syntax: Operands: Operation: Status Affected: Encoding: ffff ffff Description: Words: Cycles: Q Cycle Activity: Q1 Decode Q2 No operation Q3 No operation Q4 No operation 110a No Operation NOP None No operation None 0000 1111 0000 xxxx 0000 xxxx 0000 xxxx
0 f 255 a [0,1] (f)+1f N, OV, C, DC, Z 0110
Location `f' is negated using two's complement. The result is placed in the data memory location `f'. If `a' is `0', the Access Bank is selected. If `a' is `1', the BSR is used to select the GPR bank (default). If `a' is `0' and the extended instruction set is enabled, this instruction operates in Indexed Literal Offset Addressing mode whenever f 95 (5Fh). See Section 24.2.3 "Byte-Oriented and Bit-Oriented Instructions in Indexed Literal Offset Mode" for details.
No operation. 1 1
Example: None.
Words: Cycles: Q Cycle Activity: Q1 Decode
1 1 Q2 Read register `f' NEGF Q3 Process Data REG, 1 Q4 Write register `f'
Example:
Before Instruction REG = After Instruction REG =
0011 1010 [3Ah] 1100 0110 [C6h]
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POP Syntax: Operands: Operation: Status Affected: Encoding: Description: Pop Top of Return Stack POP None (TOS) bit bucket None 0000 0000 0000 0110 PUSH Syntax: Operands: Operation: Status Affected: Encoding: Description: Push Top of Return Stack PUSH None (PC + 2) TOS None 0000 0000 0000 0101
The TOS value is pulled off the return stack and is discarded. The TOS value then becomes the previous value that was pushed onto the return stack. This instruction is provided to enable the user to properly manage the return stack to incorporate a software stack. 1 1
The PC + 2 is pushed onto the top of the return stack. The previous TOS value is pushed down on the stack. This instruction allows implementing a software stack by modifying TOS and then pushing it onto the return stack. 1 1
Words: Cycles: Q Cycle Activity: Q1
Words: Cycles: Q Cycle Activity: Q1 Decode
Q2 PUSH PC + 2 onto return stack PUSH = =
Q3 No operation
Q4 No operation
Q2 No operation POP GOTO
Q3 POP TOS value
Q4 No operation
Decode
Example:
Example: NEW = = 0031A2h 014332h
Before Instruction TOS Stack (1 level down) After Instruction TOS PC
Before Instruction TOS PC After Instruction PC TOS Stack (1 level down)
345Ah 0124h
= =
014332h NEW
= = =
0126h 0126h 345Ah
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RCALL Syntax: Operands: Operation: Status Affected: Encoding: Description: Relative Call RCALL n RESET Syntax: Operands: Operation: Status Affected: 1nnn nnnn nnnn Encoding: Description: Words: Cycles: Q Cycle Activity: Q1 Decode Q2 Start reset RESET Reset Value Reset Value Q3 No operation Q4 No operation Reset RESET None Reset all registers and flags that are affected by a MCLR Reset. All 0000 0000 1111 1111
-1024 n 1023 (PC) + 2 TOS, (PC) + 2 + 2n PC None 1101
Subroutine call with a jump up to 1K from the current location. First, return address (PC + 2) is pushed onto the stack. Then, add the 2's complement number `2n' to the PC. Since the PC will have incremented to fetch the next instruction, the new address will be PC + 2 + 2n. This instruction is a two-cycle instruction. 1 2
This instruction provides a way to execute a MCLR Reset in software. 1 1
Words: Cycles: Q Cycle Activity: Q1 Decode
Example: Q2 Q3 Process Data Q4 Write to PC After Instruction Registers = Flags* =
Read literal `n' PUSH PC to stack
No operation Example:
No operation HERE
No operation RCALL Jump
No operation
Before Instruction PC = Address (HERE) After Instruction PC = Address (Jump) TOS = Address (HERE + 2)
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RETFIE Syntax: Operands: Operation: Return from Interrupt RETFIE {s} s [0,1] (TOS) PC, 1 GIE/GIEH or PEIE/GIEL, if s = 1 (WS) W, (STATUSS) STATUS, (BSRS) BSR, PCLATU, PCLATH are unchanged GIE/GIEH, PEIE/GIEL. 0000 0000 0001 000s RETLW Syntax: Operands: Operation: Return Literal to W RETLW k 0 k 255 k W, (TOS) PC, PCLATU, PCLATH are unchanged None 0000 1100 kkkk kkkk
Status Affected: Encoding: Description:
Status Affected: Encoding: Description:
Return from interrupt. Stack is popped and Top-of-Stack (TOS) is loaded into the PC. Interrupts are enabled by setting either the high or low priority global interrupt enable bit. If `s' = 1, the contents of the shadow registers WS, STATUSS and BSRS are loaded into their corresponding registers W, STATUS and BSR. If `s' = 0, no update of these registers occurs (default). 1 2
W is loaded with the eight-bit literal `k'. The program counter is loaded from the top of the stack (the return address). The high address latch (PCLATH) remains unchanged. 1 2
Words: Cycles: Q Cycle Activity: Q1 Decode
Q2 Read literal `k' No operation
Q3 Process Data No operation
Q4 POP PC from stack, write to W No operation
Words: Cycles: Q Cycle Activity: Q1 Decode
No operation Example: Q2 Q3 No operation Q4 POP PC from stack Set GIEH or GIEL
No operation
No operation Example:
No operation RETFIE 1
No operation
No operation
After Interrupt PC W BSR STATUS GIE/GIEH, PEIE/GIEL
= = = = =
TOS WS BSRS STATUSS 1
CALL TABLE ; ; ; ; : TABLE ADDWF PCL ; RETLW k0 ; RETLW k1 ; : : RETLW kn ; Before Instruction W = After Instruction W =
W contains table offset value W now has table value
W = offset Begin table
End of table
07h value of kn
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RETURN Syntax: Operands: Operation: Return from Subroutine RETURN {s} s [0,1] (TOS) PC, if s = 1 (WS) W, (STATUSS) STATUS, (BSRS) BSR, PCLATU, PCLATH are unchanged None 0000 0000 0001 001s RLCF Syntax: Operands: Rotate Left f through Carry RLCF f {,d {,a}}
0 f 255 d [0,1] a [0,1] (f) dest, (f<7>) C, (C) dest<0> C, N, Z 0011 01da ffff ffff
Operation:
Status Affected: Encoding: Description:
Status Affected: Encoding: Description:
Return from subroutine. The stack is popped and the top of the stack (TOS) is loaded into the program counter. If `s'= 1, the contents of the shadow registers WS, STATUSS and BSRS are loaded into their corresponding registers W, STATUS and BSR. If `s' = 0, no update of these registers occurs (default). 1 2
The contents of register `f' are rotated one bit to the left through the Carry flag. If `d' is `0', the result is placed in W. If `d' is `1', the result is stored back in register `f' (default). If `a' is `0', the Access Bank is selected. If `a' is `1', the BSR is used to select the GPR bank (default). If `a' is `0' and the extended instruction set is enabled, this instruction operates in Indexed Literal Offset Addressing mode whenever f 95 (5Fh). See Section 24.2.3 "Byte-Oriented and Bit-Oriented Instructions in Indexed Literal Offset Mode" for details. C register f
Words: Cycles: Q Cycle Activity: Q1 Decode No operation
Q2 No operation No operation
Q3 Process Data No operation
Q4 POP PC from stack No operation Words: Cycles: Q Cycle Activity:
1 1 Q1 Decode Q2 Read register `f' RLCF Q3 Process Data Q4 Write to destination
Example:
RETURN
After Instruction: PC = TOS
Example: Before Instruction REG = C = After Instruction REG = W = C =
REG, 0, 0
1110 0110 0 1110 0110 1100 1100 1
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RLNCF Syntax: Operands: Rotate Left f (no carry) RLNCF 0 f 255 d [0,1] a [0,1] (f) dest, (f<7>) dest<0> N, Z 0100 01da ffff ffff Status Affected: Encoding: Description: f {,d {,a}} RRCF Syntax: Operands: Rotate Right f through Carry RRCF f {,d {,a}}
0 f 255 d [0,1] a [0,1] (f) dest, (f<0>) C, (C) dest<7> C, N, Z 0011 00da ffff ffff
Operation: Status Affected: Encoding: Description:
Operation:
The contents of register `f' are rotated one bit to the left. If `d' is `0', the result is placed in W. If `d' is `1', the result is stored back in register `f' (default). If `a' is `0', the Access Bank is selected. If `a' is `1', the BSR is used to select the GPR bank (default). If `a' is `0' and the extended instruction set is enabled, this instruction operates in Indexed Literal Offset Addressing mode whenever f 95 (5Fh). See Section 24.2.3 "Byte-Oriented and Bit-Oriented Instructions in Indexed Literal Offset Mode" for details. register f
The contents of register `f' are rotated one bit to the right through the Carry flag. If `d' is `0', the result is placed in W. If `d' is `1', the result is placed back in register `f' (default). If `a' is `0', the Access Bank is selected. If `a' is `1', the BSR is used to select the GPR bank (default). If `a' is `0' and the extended instruction set is enabled, this instruction operates in Indexed Literal Offset Addressing mode whenever f 95 (5Fh). See Section 24.2.3 "Byte-Oriented and Bit-Oriented Instructions in Indexed Literal Offset Mode" for details. C register f
Words: Cycles: Q Cycle Activity: Q1 Decode
1 1 Words: Q2 Read register `f' RLNCF Q3 Process Data Q4 Write to destination Cycles: Q Cycle Activity: Q1 Decode Q2 1 1
Q3 Process Data REG, 0, 0
Q4 Write to destination
Example: Before Instruction REG = After Instruction REG =
REG, 1, 0 Example:
Read register `f' RRCF
1010 1011 0101 0111
Before Instruction REG = C = After Instruction REG = W = C =
1110 0110 0 1110 0110 0111 0011 0
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RRNCF Syntax: Operands: Rotate Right f (no carry) RRNCF f {,d {,a}} SETF Syntax: Operands: Operation: Status Affected: Encoding: ffff ffff Description: Set f SETF f {,a}
0 f 255 d [0,1] a [0,1] (f) dest, (f<0>) dest<7> N, Z 0100 00da
0 f 255 a [0,1] FFh f None 0110 100a ffff ffff
Operation: Status Affected: Encoding: Description:
The contents of the specified register are set to FFh. If `a' is `0', the Access Bank is selected. If `a' is `1', the BSR is used to select the GPR bank (default). If `a' is `0' and the extended instruction set is enabled, this instruction operates in Indexed Literal Offset Addressing mode whenever f 95 (5Fh). See Section 24.2.3 "Byte-Oriented and Bit-Oriented Instructions in Indexed Literal Offset Mode" for details.
The contents of register `f' are rotated one bit to the right. If `d' is `0', the result is placed in W. If `d' is `1', the result is placed back in register `f' (default). If `a' is `0', the Access Bank will be selected, overriding the BSR value. If `a' is `1', then the bank will be selected as per the BSR value (default). If `a' is `0' and the extended instruction set is enabled, this instruction operates in Indexed Literal Offset Addressing mode whenever f 95 (5Fh). See Section 24.2.3 "Byte-Oriented and Bit-Oriented Instructions in Indexed Literal Offset Mode" for details. register f
Words: Cycles: Q Cycle Activity: Q1 Decode
1 1 Q2 Read register `f' SETF = = 5Ah FFh Q3 Process Data REG,1 Q4 Write register `f'
Words: Cycles: Q Cycle Activity: Q1 Decode
1 1 Q2 Read register `f' RRNCF Q3 Process Data REG, 1, 0 Q4 Write to destination Example:
Before Instruction REG After Instruction REG
Example 1:
Before Instruction REG = After Instruction REG = Example 2:
1101 0111 1110 1011 REG, 0, 0
RRNCF
Before Instruction W = REG = After Instruction W = REG =
? 1101 0111 1110 1011 1101 0111
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SLEEP Syntax: Operands: Operation: Enter Sleep Mode SLEEP None 00h WDT, 0 WDT postscaler, 1 TO, 0 PD TO, PD 0000 0000 0000 0011 SUBFWB Syntax: Operands: Subtract f from W with Borrow SUBFWB 0 f 255 d [0,1] a [0,1] (W) - (f) - (C) dest N, OV, C, DC, Z 0101 01da ffff ffff f {,d {,a}}
Operation: Status Affected: Encoding: Description:
Status Affected: Encoding: Description:
The Power-Down status bit (PD) is cleared. The Time-out status bit (TO) is set. The Watchdog Timer and its postscaler are cleared. The processor is put into Sleep mode with the oscillator stopped.
Subtract register `f' and Carry flag (borrow) from W (2's complement method). If `d' is `0', the result is stored in W. If `d' is `1', the result is stored in register `f' (default). If `a' is `0', the Access Bank is selected. If `a' is `1', the BSR is used to select the GPR bank (default). If `a' is `0' and the extended instruction set is enabled, this instruction operates in Indexed Literal Offset Addressing mode whenever f 95 (5Fh). See Section 24.2.3 "Byte-Oriented and Bit-Oriented Instructions in Indexed Literal Offset Mode" for details.
Words: Cycles: Q Cycle Activity: Q1 Decode
1 1 Q2 No operation SLEEP Q3 Process Data Q4 Go to Sleep Words: Cycles: Q Cycle Activity: Q1 Decode
Example: Before Instruction TO = ? ? PD =
1 1 Q2 Read register `f' Q3 Process Data Q4 Write to destination
After Instruction 1 TO = PD = 0 If WDT causes wake-up, this bit is cleared.
SUBFWB REG, 1, 0 Example 1: Before Instruction REG = 3 W = 2 C = 1 After Instruction REG = FF W = 2 C = 0 Z = 0 N = 1 ; result is negative SUBFWB REG, 0, 0 Example 2: Before Instruction REG = 2 W = 5 C = 1 After Instruction REG = 2 W = 3 C = 1 Z = 0 N = 0 ; result is positive SUBFWB REG, 1, 0 Example 3: Before Instruction REG = 1 W = 2 C = 0 After Instruction REG = 0 W = 2 C = 1 Z = 1 ; result is zero N = 0
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SUBLW Syntax: Operands: Operation: Status Affected: Encoding: Description: Words: Cycles: Q Cycle Activity: Q1 Decode Example 1: Before Instruction W = C = After Instruction W = C = Z = N = Example 2: Before Instruction W = C = After Instruction W = C = Z = N = Example 3: Before Instruction W = C = After Instruction W = C = Z = N = Q2 Read literal `k' SUBLW 01h ? 01h 1 0 0 SUBLW 02h ? 00h 1 1 0 SUBLW 03h ? FFh 0 0 1 ; (2's complement) ; result is negative Q3 Process Data 02h Q4 Write to W Subtract W from literal SUBLW k 0 k 255 k - (W) W N, OV, C, DC, Z 0000 1000 kkkk kkkk Operation: Status Affected: Encoding: Description: SUBWF Syntax: Operands: Subtract W from f SUBWF 0 f 255 d [0,1] a [0,1] (f) - (W) dest N, OV, C, DC, Z 0101 11da ffff ffff f {,d {,a}}
W is subtracted from the eight-bit literal `k'. The result is placed in W. 1 1
Subtract W from register `f' (2's complement method). If `d' is `0', the result is stored in W. If `d' is `1', the result is stored back in register `f' (default). If `a' is `0', the Access Bank is selected. If `a' is `1', the BSR is used to select the GPR bank (default). If `a' is `0' and the extended instruction set is enabled, this instruction operates in Indexed Literal Offset Addressing mode whenever f 95 (5Fh). See Section 24.2.3 "Byte-Oriented and Bit-Oriented Instructions in Indexed Literal Offset Mode" for details.
; result is positive Words: Cycles: 02h Q Cycle Activity: Q1 Decode Example 1:
1 1 Q2 Read register `f' SUBWF 3 2 ? 1 2 1 0 0 SUBWF 2 2 ? 2 0 1 1 0 SUBWF 1 2 ? FFh ;(2's complement) 2 0 ; result is negative 0 1 Q3 Process Data REG, 1, 0 Q4 Write to destination
; result is zero
02h
Before Instruction REG = W = C = After Instruction REG = W = C = Z = N = Example 2: Before Instruction REG = W = C = After Instruction REG = W = C = Z = N = Example 3: Before Instruction REG = W = C = After Instruction REG = W = C = Z = N =
; result is positive
REG, 0, 0
; result is zero
REG, 1, 0
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SUBWFB Syntax: Operands: Subtract W from f with Borrow SUBWFB 0 f 255 d [0,1] a [0,1] (f) - (W) - (C) dest N, OV, C, DC, Z 0101 10da ffff ffff Status Affected: Encoding: Description: Subtract W and the Carry flag (borrow) from register `f' (2's complement method). If `d' is `0', the result is stored in W. If `d' is `1', the result is stored back in register `f' (default). If `a' is `0', the Access Bank is selected. If `a' is `1', the BSR is used to select the GPR bank (default). If `a' is `0' and the extended instruction set is enabled, this instruction operates in Indexed Literal Offset Addressing mode whenever f 95 (5Fh). See Section 24.2.3 "Byte-Oriented and Bit-Oriented Instructions in Indexed Literal Offset Mode" for details. Words: Cycles: Q Cycle Activity: Q1 Decode Example 1: Before Instruction REG = W = C = After Instruction REG = W = C = Z = N = Example 2: Before Instruction REG = W = C = After Instruction REG = W = C = Z = N = Example 3: Before Instruction REG = W = C = After Instruction REG = W C Z N = = = = 1 1 Q2 Read register `f' SUBWFB 19h 0Dh 1 0Ch 0Dh 1 0 0 Q3 Process Data REG, 1, 0 (0001 1001) (0000 1101) Example: Q4 Write to destination Words: Cycles: Q Cycle Activity: Q1 Decode Q2 Read register `f' SWAPF 53h 35h Q3 Process Data REG, 1, 0 Q4 Write to destination f {,d {,a}} SWAPF Syntax: Operands: Swap f SWAPF f {,d {,a}} 0 f 255 d [0,1] a [0,1] (f<3:0>) dest<7:4>, (f<7:4>) dest<3:0> None 0011 10da ffff ffff
Operation: Status Affected: Encoding: Description:
Operation:
The upper and lower nibbles of register `f' are exchanged. If `d' is `0', the result is placed in W. If `d' is `1', the result is placed in register `f' (default). If `a' is `0', the Access Bank is selected. If `a' is `1', the BSR is used to select the GPR bank (default). If `a' is `0' and the extended instruction set is enabled, this instruction operates in Indexed Literal Offset Addressing mode whenever f 95 (5Fh). See Section 24.2.3 "Byte-Oriented and Bit-Oriented Instructions in Indexed Literal Offset Mode" for details. 1 1
(0000 1011) (0000 1101) ; result is positive
Before Instruction REG = After Instruction REG =
SUBWFB REG, 0, 0 1Bh 1Ah 0 1Bh 00h 1 1 0 SUBWFB 03h 0Eh 1 F5h 0Eh 0 0 1 (0001 1011) (0001 1010)
(0001 1011) ; result is zero REG, 1, 0 (0000 0011) (0000 1101)
(1111 0100) ; [2's comp] (0000 1101) ; result is negative
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TBLRD Syntax: Operands: Operation: Table Read TBLRD ( *; *+; *-; +*) None if TBLRD *, (Prog Mem (TBLPTR)) TABLAT; TBLPTR - No Change if TBLRD *+, (Prog Mem (TBLPTR)) TABLAT; (TBLPTR) + 1 TBLPTR if TBLRD *-, (Prog Mem (TBLPTR)) TABLAT; (TBLPTR) - 1 TBLPTR if TBLRD +*, (TBLPTR) + 1 TBLPTR; (Prog Mem (TBLPTR)) TABLAT TBLRD Example 1: Table Read (Continued) TBLRD *+ ; = = = = = +* ; = = = = = = AAh 01A357h 12h 34h 34h 01A358h 55h 00A356h 34h 34h 00A357h
Before Instruction TABLAT TBLPTR MEMORY(00A356h) After Instruction TABLAT TBLPTR Example 2: TBLRD
Status Affected: None Encoding: 0000 0000 0000 10nn nn=0 * =1 *+ =2 *=3 +*
Before Instruction TABLAT TBLPTR MEMORY(01A357h) MEMORY(01A358h) After Instruction TABLAT TBLPTR
Description:
This instruction is used to read the contents of Program Memory (P.M.). To address the program memory, a pointer called Table Pointer (TBLPTR) is used. The TBLPTR (a 21-bit pointer) points to each byte in the program memory. TBLPTR has a 2-Mbyte address range. TBLPTR[0] = 0: Least Significant Byte of Program Memory Word TBLPTR[0] = 1: Most Significant Byte of Program Memory Word The TBLRD instruction can modify the value of TBLPTR as follows: * no change * post-increment * post-decrement * pre-increment
Words: Cycles: Q Cycle Activity: Q1 Decode No operation
1 2 Q2 No operation No operation (Read Program Memory) Q3 No operation No operation Q4 No operation No operation (Write TABLAT)
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TBLWT Syntax: Operands: Operation: Table Write TBLWT ( *; *+; *-; +*) None if TBLWT*, (TABLAT) Holding Register; TBLPTR - No Change if TBLWT*+, (TABLAT) Holding Register; (TBLPTR) + 1 TBLPTR if TBLWT*-, (TABLAT) Holding Register; (TBLPTR) - 1 TBLPTR if TBLWT+*, (TBLPTR) + 1 TBLPTR; (TABLAT) Holding Register None 0000 0000 0000 11nn nn=0 * =1 *+ =2 *=3 +* TBLWT Example 1: Table Write (Continued) TBLWT *+;
Before Instruction TABLAT = 55h TBLPTR = 00A356h HOLDING REGISTER (00A356h) = FFh After Instructions (table write completion) TABLAT = 55h TBLPTR = 00A357h HOLDING REGISTER (00A356h) = 55h Example 2: TBLWT +*;
Status Affected: Encoding:
Description:
This instruction uses the 3 LSBs of TBLPTR to determine which of the 8 holding registers the TABLAT is written to. The holding registers are used to program the contents of Program Memory (P.M.). (Refer to Section 5.0 "Memory Organization" for additional details on programming Flash memory.) The TBLPTR (a 21-bit pointer) points to each byte in the program memory. TBLPTR has a 2-Mbyte address range. The LSb of the TBLPTR selects which byte of the program memory location to access. TBLPTR[0] = 0: Least Significant Byte of Program Memory Word TBLPTR[0] = 1: Most Significant Byte of Program Memory Word The TBLWT instruction can modify the value of TBLPTR as follows: * * * * no change post-increment post-decrement pre-increment
Before Instruction TABLAT = 34h TBLPTR = 01389Ah HOLDING REGISTER (01389Ah) = FFh HOLDING REGISTER (01389Bh) = FFh After Instruction (table write completion) TABLAT = 34h TBLPTR = 01389Bh HOLDING REGISTER (01389Ah) = FFh HOLDING REGISTER (01389Bh) = 34h
Note:
The TBLWT instruction cannot be used in normal operating modes to write to on-chip program memory. It can only be used by PIC18F8XJ10/8XJ15 devices with the external memory interface when writing to an external memory device. The TBLWT instruction can be used to write to on-chip program memory only in ICSPTM mode. For more information, refer to Section 6.4 "Writing to Program Memory Space (PIC18F8XJ10/8XJ15 Devices Only)" and Section 6.7 "Flash Program Operation During Code Protection".
Words: Cycles: Q Cycle Activity:
1 2 Q1 Decode Q2 Q3 Q4
No No No operation operation operation
No No No No operation operation operation operation (Read (Write to TABLAT) Holding Register)
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TSTFSZ Syntax: Operands: Operation: Status Affected: Encoding: Description: Test f, Skip if 0 TSTFSZ f {,a} 0 f 255 a [0,1] skip if f = 0 None 0110 011a ffff ffff XORLW Syntax: Operands: Operation: Status Affected: Encoding: Description: Exclusive OR Literal with W XORLW k 0 k 255 (W) .XOR. k W N, Z 0000 1010 kkkk kkkk
If `f' = 0, the next instruction fetched during the current instruction execution is discarded and a NOP is executed, making this a two-cycle instruction. If `a' is `0', the Access Bank is selected. If `a' is `1', the BSR is used to select the GPR bank (default). If `a' is `0' and the extended instruction set is enabled, this instruction operates in Indexed Literal Offset Addressing mode whenever f 95 (5Fh). See Section 24.2.3 "Byte-Oriented and Bit-Oriented Instructions in Indexed Literal Offset Mode" for details.
The contents of W are XORed with the 8-bit literal `k'. The result is placed in W. 1 1
Words: Cycles: Q Cycle Activity: Q1 Decode
Q2 Read literal `k' XORLW B5h 1Ah
Q3 Process Data 0AFh
Q4 Write to W
Example: Before Instruction W = After Instruction W =
Words: Cycles:
1 1(2) Note: 3 cycles if skip and followed by a 2-word instruction. Q1 Decode Q2 Read register `f' Q2 No operation Q2 No operation No operation HERE NZERO ZERO = = = = Q3 Process Data Q3 No operation Q3 No operation No operation TSTFSZ : : Q4 No operation Q4 No operation Q4 No operation No operation
Q Cycle Activity:
If skip: Q1 No operation Q1 No operation No operation Example:
If skip and followed by 2-word instruction:
CNT, 1
Before Instruction PC After Instruction If CNT PC If CNT PC
Address (HERE) 00h, Address (ZERO) 00h, Address (NZERO)
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XORWF Syntax: Operands: Exclusive OR W with f XORWF 0 f 255 d [0,1] a [0,1] (W) .XOR. (f) dest N, Z 0001 10da ffff ffff f {,d {,a}}
Operation: Status Affected: Encoding: Description:
Exclusive OR the contents of W with register `f'. If `d' is `0', the result is stored in W. If `d' is `1', the result is stored back in the register `f' (default). If `a' is `0', the Access Bank is selected. If `a' is `1', the BSR is used to select the GPR bank (default). If `a' is `0' and the extended instruction set is enabled, this instruction operates in Indexed Literal Offset Addressing mode whenever f 95 (5Fh). See Section 24.2.3 "Byte-Oriented and Bit-Oriented Instructions in Indexed Literal Offset Mode" for details.
Words: Cycles: Q Cycle Activity: Q1 Decode
1 1 Q2 Read register `f' XORWF AFh B5h 1Ah B5h Q3 Process Data REG, 1, 0 Q4 Write to destination
Example:
Before Instruction REG = W = After Instruction REG = W =
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24.2 Extended Instruction Set
In addition to the standard 75 instructions of the PIC18 instruction set, the PIC18F87J10 family of devices also provide an optional extension to the core CPU functionality. The added features include eight additional instructions that augment indirect and indexed addressing operations and the implementation of Indexed Literal Offset Addressing for many of the standard PIC18 instructions. The additional features of the extended instruction set are enabled by default on unprogrammed devices. Users must properly set or clear the XINST configuration bit during programming to enable or disable these features. The instructions in the extended set can all be classified as literal operations, which either manipulate the File Select Registers, or use them for indexed addressing. Two of the instructions, ADDFSR and SUBFSR, each have an additional special instantiation for using FSR2. These versions (ADDULNK and SUBULNK) allow for automatic return after execution. The extended instructions are specifically implemented to optimize re-entrant program code (that is, code that is recursive or that uses a software stack) written in high-level languages, particularly C. Among other things, they allow users working in high-level languages to perform certain operations on data structures more efficiently. These include: * dynamic allocation and deallocation of software stack space when entering and leaving subroutines * function pointer invocation * software stack pointer manipulation * manipulation of variables located in a software stack A summary of the instructions in the extended instruction set is provided in Table 24-3. Detailed descriptions are provided in Section 24.2.2 "Extended Instruction Set". The opcode field descriptions in Table 24-1 (page 280) apply to both the standard and extended PIC18 instruction sets. Note: The instruction set extension and the Indexed Literal Offset Addressing mode were designed for optimizing applications written in C; the user may likely never use these instructions directly in assembler. The syntax for these commands is provided as a reference for users who may be reviewing code that has been generated by a compiler.
24.2.1
EXTENDED INSTRUCTION SYNTAX
Most of the extended instructions use indexed arguments, using one of the File Select Registers and some offset to specify a source or destination register. When an argument for an instruction serves as part of indexed addressing, it is enclosed in square brackets ("[ ]"). This is done to indicate that the argument is used as an index or offset. The MPASMTM Assembler will flag an error if it determines that an index or offset value is not bracketed. When the extended instruction set is enabled, brackets are also used to indicate index arguments in byte-oriented and bit-oriented instructions. This is in addition to other changes in their syntax. For more details, see Section 24.2.3.1 "Extended Instruction Syntax with Standard PIC18 Commands". Note: In the past, square brackets have been used to denote optional arguments in the PIC18 and earlier instruction sets. In this text and going forward, optional arguments are denoted by braces ("{ }").
TABLE 24-3:
Mnemonic, Operands ADDFSR ADDULNK CALLW MOVSF MOVSS PUSHL SUBFSR SUBULNK f, k k
EXTENSIONS TO THE PIC18 INSTRUCTION SET
16-Bit Instruction Word Description Add literal to FSR Add literal to FSR2 and return Call subroutine using WREG Move zs (source) to 1st word fd (destination) 2nd word Move zs (source) to 1st word zd (destination) 2nd word Store literal at FSR2, decrement FSR2 Subtract literal from FSR Subtract literal from FSR2 and return Cycles MSb 1 2 2 2 2 1 1 2 1110 1110 0000 1110 1111 1110 1111 1110 1110 1110 1000 1000 0000 1011 ffff 1011 xxxx 1010 1001 1001 ffkk 11kk 0001 0zzz ffff 1zzz xzzz kkkk ffkk 11kk LSb kkkk kkkk 0100 zzzz ffff zzzz zzzz kkkk kkkk kkkk Status Affected None None None None None None None None
zs, fd zs, zd k f, k k
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24.2.2 EXTENDED INSTRUCTION SET
ADDFSR Syntax: Operands: Operation: Status Affected: Encoding: Description: Words: Cycles: Q Cycle Activity: Q1 Decode
Add Literal to FSR ADDFSR f, k 0 k 63 f [ 0, 1, 2 ] FSR(f) + k FSR(f) None 1110 1000 ffkk kkkk The 6-bit literal `k' is added to the contents of the FSR specified by `f'. 1 1 Q2 Read literal `k' Q3 Process Data Q4 Write to FSR
ADDULNK Syntax: Operands: Operation: Status Affected: Encoding: Description:
Add Literal to FSR2 and Return ADDULNK k 0 k 63 FSR2 + k FSR2, (TOS) PC None 1110 1000 11kk kkkk The 6-bit literal `k' is added to the contents of FSR2. A RETURN is then executed by loading the PC with the TOS. The instruction takes two cycles to execute; a NOP is performed during the second cycle. This may be thought of as a special case of the ADDFSR instruction, where f = 3 (binary `11'); it operates only on FSR2.
Example:
ADDFSR 03FFh 0422h
2, 23h Words: Cycles: Q Cycle Activity: Q1 Decode No Operation
Before Instruction FSR2 = After Instruction FSR2 =
1 2 Q2 Read literal `k' No Operation Q3 Process Data No Operation Q4 Write to FSR No Operation
Example:
ADDULNK 23h 03FFh 0100h 0422h (TOS)
Before Instruction FSR2 = PC = After Instruction FSR2 = PC =
Note:
All PIC18 instructions may take an optional label argument preceding the instruction mnemonic for use in symbolic addressing. If a label is used, the instruction format then becomes: {label} instruction argument(s).
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CALLW Syntax: Operands: Operation: Subroutine Call using WREG CALLW None (PC + 2) TOS, (W) PCL, (PCLATH) PCH, (PCLATU) PCU None 0000 0000 0001 0100 MOVSF Syntax: Operands: Operation: Status Affected: Encoding: 1st word (source) 2nd word (destin.) Description: Move Indexed to f MOVSF [zs], fd 0 zs 127 0 fd 4095 ((FSR2) + zs) fd None 1110 1111 1011 ffff 0zzz ffff zzzzs ffffd
Status Affected: Encoding: Description
First, the return address (PC + 2) is pushed onto the return stack. Next, the contents of W are written to PCL; the existing value is discarded. Then, the contents of PCLATH and PCLATU are latched into PCH and PCU, respectively. The second cycle is executed as a NOP instruction while the new next instruction is fetched. Unlike CALL, there is no option to update W, STATUS or BSR.
The contents of the source register are moved to destination register `fd'. The actual address of the source register is determined by adding the 7-bit literal offset `zs', in the first word, to the value of FSR2. The address of the destination register is specified by the 12-bit literal `fd' in the second word. Both addresses can be anywhere in the 4096-byte data space (000h to FFFh). The MOVSF instruction cannot use the PCL, TOSU, TOSH or TOSL as the destination register. If the resultant source address points to an indirect addressing register, the value returned will be 00h.
Words: Cycles: Q Cycle Activity: Q1 Decode No operation
1 2 Q2 Read WREG No operation Q3 Push PC to stack No operation Q4 No operation No operation Words: Cycles: Q Cycle Activity: Q1 Decode
2 2 Q2 Q3 Q4 Read source reg Write register `f' (dest)
Example:
HERE
CALLW Decode
Determine Determine source addr source addr No operation No dummy read No operation
Before Instruction PC = PCLATH = PCLATU = W = After Instruction PC = TOS = PCLATH = PCLATU = W =
address (HERE) 10h 00h 06h 001006h address (HERE + 2) 10h 00h 06h
Example:
MOVSF = = = = = =
[05h], REG2 80h 33h 11h 80h 33h 33h
Before Instruction FSR2 Contents of 85h REG2 After Instruction FSR2 Contents of 85h REG2
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MOVSS Syntax: Operands: Operation: Status Affected: Encoding: 1st word (source) 2nd word (dest.) Description Move Indexed to Indexed MOVSS [zs], [zd] 0 zs 127 0 zd 127 ((FSR2) + zs) ((FSR2) + zd) None 1110 1111 1011 xxxx 1zzz xzzz zzzzs zzzzd PUSHL Syntax: Operands: Operation: Status Affected: Encoding: Description: Store Literal at FSR2, Decrement FSR2 PUSHL k 0 k 255 k (FSR2), FSR2 - 1 FSR2 None 1111 1010 kkkk kkkk
The contents of the source register are moved to the destination register. The addresses of the source and destination registers are determined by adding the 7-bit literal offsets `zs' or `zd', respectively, to the value of FSR2. Both registers can be located anywhere in the 4096-byte data memory space (000h to FFFh). The MOVSS instruction cannot use the PCL, TOSU, TOSH or TOSL as the destination register. If the resultant source address points to an indirect addressing register, the value returned will be 00h. If the resultant destination address points to an indirect addressing register, the instruction will execute as a NOP.
The 8-bit literal `k' is written to the data memory address specified by FSR2. FSR2 is decremented by 1 after the operation. This instruction allows users to push values onto a software stack.
Words: Cycles: Q Cycle Activity: Q1 Decode
1 1 Q2 Read `k' Q3 Process data Q4 Write to destination
Example:
PUSHL
08h = = 01ECh 00h
Before Instruction FSR2H:FSR2L Memory (01ECh) After Instruction FSR2H:FSR2L Memory (01ECh)
Words: Cycles: Q Cycle Activity: Q1 Decode Decode
2 2 Q2 Q3 Q4 Read source reg Write to dest reg
= =
01EBh 08h
Determine Determine source addr source addr Determine dest addr Determine dest addr
Example:
MOVSS = = = = = =
[05h], [06h] 80h 33h 11h 80h 33h 33h
Before Instruction FSR2 Contents of 85h Contents of 86h After Instruction FSR2 Contents of 85h Contents of 86h
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SUBFSR Syntax: Operands: Operation: Status Affected: Encoding: Description: Subtract Literal from FSR SUBFSR f, k 0 k 63 f [ 0, 1, 2 ] FSRf - k FSRf None 1110 1001 ffkk kkkk The 6-bit literal `k' is subtracted from the contents of the FSR specified by `f'. 1 1 Q1 Decode Q2 Read register `f' Q3 Process Data Q4 Write to destination Words: Example: Before Instruction FSR2 = After Instruction FSR2 = SUBFSR 2, 23h 03FFh 03DCh Cycles: Q Cycle Activity: Q1 Decode No Operation Q2 Read register `f' No Operation Q3 Process Data No Operation Q4 Write to destination No Operation Status Affected: Encoding: Description: SUBULNK Syntax: Operands: Operation: Subtract Literal from FSR2 and Return SUBULNK k 0 k 63 FSR2 - k FSR2 (TOS) PC None 1110 1001 11kk kkkk The 6-bit literal `k' is subtracted from the contents of the FSR2. A RETURN is then executed by loading the PC with the TOS. The instruction takes two cycles to execute; a NOP is performed during the second cycle. This may be thought of as a special case of the SUBFSR instruction, where f = 3 (binary `11'); it operates only on FSR2. 1 2
Words: Cycles: Q Cycle Activity:
Example: Before Instruction FSR2 = PC = After Instruction FSR2 = PC =
SUBULNK 23h 03FFh 0100h 03DCh (TOS)
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24.2.3 BYTE-ORIENTED AND BIT-ORIENTED INSTRUCTIONS IN INDEXED LITERAL OFFSET MODE
Enabling the PIC18 instruction set extension may cause legacy applications to behave erratically or fail entirely.
24.2.3.1
Extended Instruction Syntax with Standard PIC18 Commands
Note:
In addition to eight new commands in the extended set, enabling the extended instruction set also enables Indexed Literal Offset Addressing (Section 5.6.1 "Indexed Addressing with Literal Offset"). This has a significant impact on the way that many commands of the standard PIC18 instruction set are interpreted. When the extended set is disabled, addresses embedded in opcodes are treated as literal memory locations: either as a location in the Access Bank (a = 0) or in a GPR bank designated by the BSR (a = 1). When the extended instruction set is enabled and a = 0, however, a file register argument of 5Fh or less is interpreted as an offset from the pointer value in FSR2 and not as a literal address. For practical purposes, this means that all instructions that use the Access RAM bit as an argument - that is, all byte-oriented and bit-oriented instructions, or almost half of the core PIC18 instructions - may behave differently when the extended instruction set is enabled. When the content of FSR2 is 00h, the boundaries of the Access RAM are essentially remapped to their original values. This may be useful in creating backward-compatible code. If this technique is used, it may be necessary to save the value of FSR2 and restore it when moving back and forth between C and assembly routines in order to preserve the Stack Pointer. Users must also keep in mind the syntax requirements of the extended instruction set (see Section 24.2.3.1 "Extended Instruction Syntax with Standard PIC18 Commands"). Although the Indexed Literal Offset mode can be very useful for dynamic stack and pointer manipulation, it can also be very annoying if a simple arithmetic operation is carried out on the wrong register. Users who are accustomed to the PIC18 programming must keep in mind that, when the extended instruction set is enabled, register addresses of 5Fh or less are used for Indexed Literal Offset Addressing. Representative examples of typical byte-oriented and bit-oriented instructions in the Indexed Literal Offset mode are provided on the following page to show how execution is affected. The operand conditions shown in the examples are applicable to all instructions of these types.
When the extended instruction set is enabled, the file register argument `f' in the standard byte-oriented and bit-oriented commands is replaced with the literal offset value `k'. As already noted, this occurs only when `f' is less than or equal to 5Fh. When an offset value is used, it must be indicated by square brackets ("[ ]"). As with the extended instructions, the use of brackets indicates to the compiler that the value is to be interpreted as an index or an offset. Omitting the brackets, or using a value greater than 5Fh within the brackets, will generate an error in the MPASM Assembler. If the index argument is properly bracketed for Indexed Literal Offset Addressing, the Access RAM argument is never specified; it will automatically be assumed to be `0'. This is in contrast to standard operation (extended instruction set disabled), when `a' is set on the basis of the target address. Declaring the Access RAM bit in this mode will also generate an error in the MPASM Assembler. The destination argument `d' functions as before. In the latest versions of the MPASM Assembler, language support for the extended instruction set must be explicitly invoked. This is done with either the command line option, /y, or the PE directive in the source listing.
24.2.4
CONSIDERATIONS WHEN ENABLING THE EXTENDED INSTRUCTION SET
It is important to note that the extensions to the instruction set may not be beneficial to all users. In particular, users who are not writing code that uses a software stack may not benefit from using the extensions to the instruction set. Additionally, the Indexed Literal Offset Addressing mode may create issues with legacy applications written to the PIC18 assembler. This is because instructions in the legacy code may attempt to address registers in the Access Bank below 5Fh. Since these addresses are interpreted as literal offsets to FSR2 when the instruction set extension is enabled, the application may read or write to the wrong data addresses. When porting an application to the PIC18F87J10 family, it is very important to consider the type of code. A large, re-entrant application that is written in C and would benefit from efficient compilation will do well when using the instruction set extensions. Legacy applications that heavily use the Access Bank will most likely not benefit from using the extended instruction set.
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ADDWF Syntax: Operands: Operation: Status Affected: Encoding: Description: ADD W to Indexed (Indexed Literal Offset mode) ADDWF 0 k 95 d [0,1] (W) + ((FSR2) + k) dest N, OV, C, DC, Z 0010 01d0 kkkk kkkk [k] {,d} BSF Syntax: Operands: Operation: Status Affected: Encoding: Description: Words: Cycles: Q Cycle Activity: Q1 Decode Q2 Read register `f' BSF = = = Q3 Process Data Q4 Write to destination Bit Set Indexed (Indexed Literal Offset mode) BSF [k], b 0 f 95 0b7 1 ((FSR2) + k) None 1000 bbb0 kkkk kkkk
The contents of W are added to the contents of the register indicated by FSR2, offset by the value `k'. If `d' is `0', the result is stored in W. If `d' is `1', the result is stored back in register `f' (default).
Bit `b' of the register indicated by FSR2, offset by the value `k', is set. 1 1
Words: Cycles: Q Cycle Activity: Q1 Decode
1 1 Q2 Read `k' Q3 Process Data [OFST] ,0 = = = = = = 17h 2Ch 0A00h 20h 37h 20h SETF Syntax: Operands: Operation: Q4 Write to destination
Example:
[FLAG_OFST], 7 0Ah 0A00h 55h
Example:
ADDWF
Before Instruction W OFST FSR2 Contents of 0A2Ch After Instruction W Contents of 0A2Ch
Before Instruction FLAG_OFST FSR2 Contents of 0A0Ah After Instruction Contents of 0A0Ah
=
D5h
Set Indexed (Indexed Literal Offset mode) SETF [k] 0 k 95 FFh ((FSR2) + k) None 0110 1000 kkkk kkkk
Status Affected: Encoding: Description: Words: Cycles: Q Cycle Activity: Q1 Decode
The contents of the register indicated by FSR2, offset by `k', are set to FFh. 1 1 Q2 Read `k' Q3 Process Data [OFST] 2Ch 0A00h 00h Q4 Write register
Example:
SETF = = =
Before Instruction OFST FSR2 Contents of 0A2Ch After Instruction Contents of 0A2Ch
=
FFh
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24.2.5 SPECIAL CONSIDERATIONS WITH MICROCHIP MPLAB(R) IDE TOOLS
The latest versions of Microchip's software tools have been designed to fully support the extended instruction set for the PIC18F87J10 family. This includes the MPLAB C18 C Compiler, MPASM assembly language and MPLAB Integrated Development Environment (IDE). When selecting a target device for software development, MPLAB IDE will automatically set default configuration bits for that device. The default setting for the XINST configuration is `0', disabling the extended instruction set and Indexed Literal Offset Addressing. For proper execution of applications developed to take advantage of the extended instruction set, XINST must be set during programming. To develop software for the extended instruction set, the user must enable support for the instructions and the Indexed Addressing mode in their language tool(s). Depending on the environment being used, this may be done in several ways: * A menu option or dialog box within the environment that allows the user to configure the language tool and its settings for the project * A command line option * A directive in the source code These options vary between different compilers, assemblers and development environments. Users are encouraged to review the documentation accompanying their development systems for the appropriate information.
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25.0 DEVELOPMENT SUPPORT
25.1
The PICmicro(R) microcontrollers are supported with a full range of hardware and software development tools: * Integrated Development Environment - MPLAB(R) IDE Software * Assemblers/Compilers/Linkers - MPASMTM Assembler - MPLAB C17 and MPLAB C18 C Compilers - MPLINKTM Object Linker/ MPLIBTM Object Librarian - MPLAB C30 C Compiler - MPLAB ASM30 Assembler/Linker/Library * Simulators - MPLAB SIM Software Simulator - MPLAB dsPIC30 Software Simulator * Emulators - MPLAB ICE 2000 In-Circuit Emulator - MPLAB ICE 4000 In-Circuit Emulator * In-Circuit Debugger - MPLAB ICD 2 * Device Programmers - PRO MATE(R) II Universal Device Programmer - PICSTART(R) Plus Development Programmer - MPLAB PM3 Device Programmer * Low-Cost Demonstration Boards - PICDEMTM 1 Demonstration Board - PICDEM.netTM Demonstration Board - PICDEM 2 Plus Demonstration Board - PICDEM 3 Demonstration Board - PICDEM 4 Demonstration Board - PICDEM 17 Demonstration Board - PICDEM 18R Demonstration Board - PICDEM LIN Demonstration Board - PICDEM USB Demonstration Board * Evaluation Kits - KEELOQ(R) Evaluation and Programming Tools - PICDEM MSC - microID(R) Developer Kits - CAN - PowerSmart(R) Developer Kits - Analog
MPLAB Integrated Development Environment Software
The MPLAB IDE software brings an ease of software development previously unseen in the 8/16-bit microcontroller market. The MPLAB IDE is a Windows(R) based application that contains: * An interface to debugging tools - simulator - programmer (sold separately) - emulator (sold separately) - in-circuit debugger (sold separately) * A full-featured editor with color coded context * A multiple project manager * Customizable data windows with direct edit of contents * High-level source code debugging * Mouse over variable inspection * Extensive on-line help The MPLAB IDE allows you to: * Edit your source files (either assembly or C) * One touch assemble (or compile) and download to PICmicro emulator and simulator tools (automatically updates all project information) * Debug using: - source files (assembly or C) - mixed assembly and C - machine code MPLAB IDE supports multiple debugging tools in a single development paradigm, from the cost effective simulators, through low-cost in-circuit debuggers, to full-featured emulators. This eliminates the learning curve when upgrading to tools with increasing flexibility and power.
25.2
MPASM Assembler
The MPASM assembler is a full-featured, universal macro assembler for all PICmicro MCUs. The MPASM assembler generates relocatable object files for the MPLINK object linker, Intel(R) standard HEX files, MAP files to detail memory usage and symbol reference, absolute LST files that contain source lines and generated machine code and COFF files for debugging. The MPASM assembler features include: * Integration into MPLAB IDE projects * User defined macros to streamline assembly code * Conditional assembly for multi-purpose source files * Directives that allow complete control over the assembly process
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25.3 MPLAB C17 and MPLAB C18 C Compilers 25.6 MPLAB ASM30 Assembler, Linker and Librarian
The MPLAB C17 and MPLAB C18 Code Development Systems are complete ANSI C compilers for Microchip's PIC17CXXX and PIC18CXXX family of microcontrollers. These compilers provide powerful integration capabilities, superior code optimization and ease of use not found with other compilers. For easy source level debugging, the compilers provide symbol information that is optimized to the MPLAB IDE debugger.
MPLAB ASM30 assembler produces relocatable machine code from symbolic assembly language for dsPIC30F devices. MPLAB C30 compiler uses the assembler to produce it's object file. The assembler generates relocatable object files that can then be archived or linked with other relocatable object files and archives to create an executable file. Notable features of the assembler include: * * * * * * Support for the entire dsPIC30F instruction set Support for fixed-point and floating-point data Command line interface Rich directive set Flexible macro language MPLAB IDE compatibility
25.4
MPLINK Object Linker/ MPLIB Object Librarian
The MPLINK object linker combines relocatable objects created by the MPASM assembler and the MPLAB C17 and MPLAB C18 C compilers. It can link relocatable objects from precompiled libraries, using directives from a linker script. The MPLIB object librarian manages the creation and modification of library files of precompiled code. When a routine from a library is called from a source file, only the modules that contain that routine will be linked in with the application. This allows large libraries to be used efficiently in many different applications. The object linker/library features include: * Efficient linking of single libraries instead of many smaller files * Enhanced code maintainability by grouping related modules together * Flexible creation of libraries with easy module listing, replacement, deletion and extraction
25.7
MPLAB SIM Software Simulator
The MPLAB SIM software simulator allows code development in a PC hosted environment by simulating the PICmicro series microcontrollers on an instruction level. On any given instruction, the data areas can be examined or modified and stimuli can be applied from a file, or user defined key press, to any pin. The execution can be performed in Single-Step, Execute Until Break or Trace mode. The MPLAB SIM simulator fully supports symbolic debugging using the MPLAB C17 and MPLAB C18 C Compilers, as well as the MPASM assembler. The software simulator offers the flexibility to develop and debug code outside of the laboratory environment, making it an excellent, economical software development tool.
25.5
MPLAB C30 C Compiler
25.8
MPLAB SIM30 Software Simulator
The MPLAB C30 C compiler is a full-featured, ANSI compliant, optimizing compiler that translates standard ANSI C programs into dsPIC30F assembly language source. The compiler also supports many command line options and language extensions to take full advantage of the dsPIC30F device hardware capabilities and afford fine control of the compiler code generator. MPLAB C30 is distributed with a complete ANSI C standard library. All library functions have been validated and conform to the ANSI C library standard. The library includes functions for string manipulation, dynamic memory allocation, data conversion, timekeeping and math functions (trigonometric, exponential and hyperbolic). The compiler provides symbolic information for high-level source debugging with the MPLAB IDE.
The MPLAB SIM30 software simulator allows code development in a PC hosted environment by simulating the dsPIC30F series microcontrollers on an instruction level. On any given instruction, the data areas can be examined or modified and stimuli can be applied from a file, or user defined key press, to any of the pins. The MPLAB SIM30 simulator fully supports symbolic debugging using the MPLAB C30 C Compiler and MPLAB ASM30 assembler. The simulator runs in either a Command Line mode for automated tasks, or from MPLAB IDE. This high-speed simulator is designed to debug, analyze and optimize time intensive DSP routines.
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25.9 MPLAB ICE 2000 High-Performance Universal In-Circuit Emulator 25.11 MPLAB ICD 2 In-Circuit Debugger
Microchip's In-Circuit Debugger, MPLAB ICD 2, is a powerful, low-cost, run-time development tool, connecting to the host PC via an RS-232 or high-speed USB interface. This tool is based on the Flash PICmicro MCUs and can be used to develop for these and other PICmicro microcontrollers. The MPLAB ICD 2 utilizes the in-circuit debugging capability built into the Flash devices. This feature, along with Microchip's In-Circuit Serial ProgrammingTM (ICSPTM) protocol, offers cost effective in-circuit Flash debugging from the graphical user interface of the MPLAB Integrated Development Environment. This enables a designer to develop and debug source code by setting breakpoints, single-stepping and watching variables, CPU status and peripheral registers. Running at full speed enables testing hardware and applications in real-time. MPLAB ICD 2 also serves as a development programmer for selected PICmicro devices.
The MPLAB ICE 2000 universal in-circuit emulator is intended to provide the product development engineer with a complete microcontroller design tool set for PICmicro microcontrollers. Software control of the MPLAB ICE 2000 in-circuit emulator is advanced by the MPLAB Integrated Development Environment, which allows editing, building, downloading and source debugging from a single environment. The MPLAB ICE 2000 is a full-featured emulator system with enhanced trace, trigger and data monitoring features. Interchangeable processor modules allow the system to be easily reconfigured for emulation of different processors. The universal architecture of the MPLAB ICE in-circuit emulator allows expansion to support new PICmicro microcontrollers. The MPLAB ICE 2000 in-circuit emulator system has been designed as a real-time emulation system with advanced features that are typically found on more expensive development tools. The PC platform and Microsoft(R) Windows 32-bit operating system were chosen to best make these features available in a simple, unified application.
25.12 PRO MATE II Universal Device Programmer
The PRO MATE II is a universal, CE compliant device programmer with programmable voltage verification at VDDMIN and VDDMAX for maximum reliability. It features an LCD display for instructions and error messages and a modular detachable socket assembly to support various package types. In Stand-Alone mode, the PRO MATE II device programmer can read, verify and program PICmicro devices without a PC connection. It can also set code protection in this mode.
25.10 MPLAB ICE 4000 High-Performance Universal In-Circuit Emulator
The MPLAB ICE 4000 universal in-circuit emulator is intended to provide the product development engineer with a complete microcontroller design tool set for highend PICmicro microcontrollers. Software control of the MPLAB ICE in-circuit emulator is provided by the MPLAB Integrated Development Environment, which allows editing, building, downloading and source debugging from a single environment. The MPLAB ICD 4000 is a premium emulator system, providing the features of MPLAB ICE 2000, but with increased emulation memory and high-speed performance for dsPIC30F and PIC18XXXX devices. Its advanced emulator features include complex triggering and timing, up to 2 Mb of emulation memory and the ability to view variables in real-time. The MPLAB ICE 4000 in-circuit emulator system has been designed as a real-time emulation system with advanced features that are typically found on more expensive development tools. The PC platform and Microsoft Windows 32-bit operating system were chosen to best make these features available in a simple, unified application.
25.13 MPLAB PM3 Device Programmer
The MPLAB PM3 is a universal, CE compliant device programmer with programmable voltage verification at VDDMIN and VDDMAX for maximum reliability. It features a large LCD display (128 x 64) for menus and error messages and a modular detachable socket assembly to support various package types. The ICSPTM cable assembly is included as a standard item. In StandAlone mode, the MPLAB PM3 device programmer can read, verify and program PICmicro devices without a PC connection. It can also set code protection in this mode. MPLAB PM3 connects to the host PC via an RS232 or USB cable. MPLAB PM3 has high-speed communications and optimized algorithms for quick programming of large memory devices and incorporates an SD/MMC card for file storage and secure data applications.
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25.14 PICSTART Plus Development Programmer
The PICSTART Plus development programmer is an easy-to-use, low-cost, prototype programmer. It connects to the PC via a COM (RS-232) port. MPLAB Integrated Development Environment software makes using the programmer simple and efficient. The PICSTART Plus development programmer supports most PICmicro devices up to 40 pins. Larger pin count devices, such as the PIC16C92X and PIC17C76X, may be supported with an adapter socket. The PICSTART Plus development programmer is CE compliant.
25.17 PICDEM 2 Plus Demonstration Board
The PICDEM 2 Plus demonstration board supports many 18, 28 and 40-pin microcontrollers, including PIC16F87X and PIC18FXX2 devices. All the necessary hardware and software is included to run the demonstration programs. The sample microcontrollers provided with the PICDEM 2 demonstration board can be programmed with a PRO MATE II device programmer, PICSTART Plus development programmer, or MPLAB ICD 2 with a Universal Programmer Adapter. The MPLAB ICD 2 and MPLAB ICE in-circuit emulators may also be used with the PICDEM 2 demonstration board to test firmware. A prototype area extends the circuitry for additional application components. Some of the features include an RS-232 interface, a 2 x 16 LCD display, a piezo speaker, an on-board temperature sensor, four LEDs and sample PIC18F452 and PIC16F877 Flash microcontrollers.
25.15 PICDEM 1 PICmicro Demonstration Board
The PICDEM 1 demonstration board demonstrates the capabilities of the PIC16C5X (PIC16C54 to PIC16C58A), PIC16C61, PIC16C62X, PIC16C71, PIC16C8X, PIC17C42, PIC17C43 and PIC17C44. All necessary hardware and software is included to run basic demo programs. The sample microcontrollers provided with the PICDEM 1 demonstration board can be programmed with a PRO MATE II device programmer or a PICSTART Plus development programmer. The PICDEM 1 demonstration board can be connected to the MPLAB ICE in-circuit emulator for testing. A prototype area extends the circuitry for additional application components. Features include an RS-232 interface, a potentiometer for simulated analog input, push button switches and eight LEDs.
25.18 PICDEM 3 PIC16C92X Demonstration Board
The PICDEM 3 demonstration board supports the PIC16C923 and PIC16C924 in the PLCC package. All the necessary hardware and software is included to run the demonstration programs.
25.19 PICDEM 4 8/14/18-Pin Demonstration Board
The PICDEM 4 can be used to demonstrate the capabilities of the 8, 14 and 18-pin PIC16XXXX and PIC18XXXX MCUs, including the PIC16F818/819, PIC16F87/88, PIC16F62XA and the PIC18F1320 family of microcontrollers. PICDEM 4 is intended to showcase the many features of these low pin count parts, including LIN and Motor Control using ECCP. Special provisions are made for low-power operation with the supercapacitor circuit and jumpers allow onboard hardware to be disabled to eliminate current draw in this mode. Included on the demo board are provisions for Crystal, RC or Canned Oscillator modes, a five volt regulator for use with a nine volt wall adapter or battery, DB-9 RS-232 interface, ICD connector for programming via ICSP and development with MPLAB ICD 2, 2 x 16 liquid crystal display, PCB footprints for H-Bridge motor driver, LIN transceiver and EEPROM. Also included are: header for expansion, eight LEDs, four potentiometers, three push buttons and a prototyping area. Included with the kit is a PIC16F627A and a PIC18F1320. Tutorial firmware is included along with the User's Guide.
25.16 PICDEM.net Internet/Ethernet Demonstration Board
The PICDEM.net demonstration board is an Internet/ Ethernet demonstration board using the PIC18F452 microcontroller and TCP/IP firmware. The board supports any 40-pin DIP device that conforms to the standard pinout used by the PIC16F877 or PIC18C452. This kit features a user friendly TCP/IP stack, web server with HTML, a 24L256 Serial EEPROM for Xmodem download to web pages into Serial EEPROM, ICSP/MPLAB ICD 2 interface connector, an Ethernet interface, RS-232 interface and a 16 x 2 LCD display. Also included is the book and CD-ROM "TCP/IP Lean, Web Servers for Embedded Systems," by Jeremy Bentham
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25.20 PICDEM 17 Demonstration Board
The PICDEM 17 demonstration board is an evaluation board that demonstrates the capabilities of several Microchip microcontrollers, including PIC17C752, PIC17C756A, PIC17C762 and PIC17C766. A programmed sample is included. The PRO MATE II device programmer, or the PICSTART Plus development programmer, can be used to reprogram the device for user tailored application development. The PICDEM 17 demonstration board supports program download and execution from external on-board Flash memory. A generous prototype area is available for user hardware expansion.
25.24 PICDEM USB PIC16C7X5 Demonstration Board
The PICDEM USB Demonstration Board shows off the capabilities of the PIC16C745 and PIC16C765 USB microcontrollers. This board provides the basis for future USB products.
25.25 Evaluation and Programming Tools
In addition to the PICDEM series of circuits, Microchip has a line of evaluation kits and demonstration software for these products. * KEELOQ evaluation and programming tools for Microchip's HCS Secure Data Products * CAN developers kit for automotive network applications * Analog design boards and filter design software * PowerSmart battery charging evaluation/ calibration kits * IrDA(R) development kit * microID development and rfLabTM development software * SEEVAL(R) designer kit for memory evaluation and endurance calculations * PICDEM MSC demo boards for Switching mode power supply, high-power IR driver, delta sigma ADC and flow rate sensor Check the Microchip web page and the latest Product Selector Guide for the complete list of demonstration and evaluation kits.
25.21 PICDEM 18R PIC18C601/801 Demonstration Board
The PICDEM 18R demonstration board serves to assist development of the PIC18C601/801 family of Microchip microcontrollers. It provides hardware implementation of both 8-bit Multiplexed/Demultiplexed and 16-bit Memory modes. The board includes 2 Mb external Flash memory and 128 Kb SRAM memory, as well as serial EEPROM, allowing access to the wide range of memory types supported by the PIC18C601/801.
25.22 PICDEM LIN PIC16C43X Demonstration Board
The powerful LIN hardware and software kit includes a series of boards and three PICmicro microcontrollers. The small footprint PIC16C432 and PIC16C433 are used as slaves in the LIN communication and feature on-board LIN transceivers. A PIC16F874 Flash microcontroller serves as the master. All three microcontrollers are programmed with firmware to provide LIN bus communication.
25.23 PICkitTM 1 Flash Starter Kit
A complete "development system in a box", the PICkitTM Flash Starter Kit includes a convenient multi-section board for programming, evaluation and development of 8/14-pin Flash PIC(R) microcontrollers. Powered via USB, the board operates under a simple Windows GUI. The PICkit 1 Starter Kit includes the User's Guide (on CD ROM), PICkit 1 tutorial software and code for various applications. Also included are MPLAB(R) IDE (Integrated Development Environment) software, software and hardware "Tips 'n Tricks for 8-pin Flash PIC(R) Microcontrollers" Handbook and a USB interface cable. Supports all current 8/14-pin Flash PIC microcontrollers, as well as many future planned devices.
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NOTES:
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26.0 ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings()
Ambient temperature under bias.............................................................................................................-40C to +125C Storage temperature .............................................................................................................................. -65C to +150C Voltage on any digital-only I/O pin with respect to VSS (except VDD and MCLR) ........................................ -0.3V to 5.5V Voltage on any combined digital and analog pin with respect to VSS (except VDD and MCLR)...... -0.3V to (VDD + 0.3V) Voltage on VDDCORE with respect to VSS................................................................................................... -0.3V to 2.75V Voltage on VDD with respect to VSS ........................................................................................................... -0.3V to 3.6V Voltage on MCLR with respect to VSS (Note 2) ............................................................................................... 0V to 3.6V Total power dissipation (Note 1) ...............................................................................................................................1.0W Maximum current out of VSS pin ...........................................................................................................................300 mA Maximum current into VDD pin ..............................................................................................................................250 mA Input clamp current, IIK (VI < 0 or VI > VDD)...................................................................................................................... 20 mA Output clamp current, IOK (VO < 0 or VO > VDD) .............................................................................................................. 20 mA Maximum output current sunk by PORTB and PORTC I/O pins.............................................................................25 mA Maximum output current sunk by PORTD, PORTE and PORTJ I/O pins .................................................................8 mA Maximum output current sunk by PORTA, PORTF, PORTG and PORTH I/O pins ..................................................2 mA Maximum output current sourced by PORTB and PORTC I/O pins .......................................................................25 mA Maximum output current sourced by PORTD, PORTE and PORTJ I/O pins............................................................8 mA Maximum output current sourced by PORTA, PORTF, PORTG and PORTH I/O pins .............................................2 mA Maximum current sunk by all ports .......................................................................................................................200 mA Maximum current sourced by all ports ..................................................................................................................200 mA Note 1: Power dissipation is calculated as follows: Pdis = VDD x {IDD - IOH} + {(VDD - VOH) x IOH} + (VOL x IOL) 2: Voltage spikes below VSS at the MCLR pin, inducing currents greater than 80 mA, may cause latch-up. Thus, a series resistor of 50-100 should be used when applying a "low" level to the MCLR pin, rather than pulling this pin directly to VSS.
NOTICE: Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operation listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability.
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FIGURE 26-1: PIC18F87J10 FAMILY VOLTAGE-FREQUENCY GRAPH (INDUSTRIAL)
4.0V 3.5V 3.0V PIC18F6XJ10/6XJ15/8XJ10/8XJ15 3.6V
Voltage
2.5V 2.0V 2.15V
4 MHz
40 MHz
Frequency
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26.1 DC Characteristics: Supply Voltage, PIC18F87J10 Family (Industrial)
Standard Operating Conditions (unless otherwise stated) Operating temperature -40C TA +85C for industrial Characteristic Supply Voltage Min VDDCORE 1.8 1.5 -- Typ -- -- -- -- Max Units 3.6 2.75 -- 0.7 V V V V See Section 4.3 "Power-on Reset (POR)" for details Conditions PIC18F87J10 Family (Industrial) Param No. D001 D001B D002 D003 Symbol VDD
VDDCORE External Supply for Microcontroller Core VDR VPOR RAM Data Retention Voltage(1) VDD Start Voltage to ensure internal Power-on Reset signal VDD Rise Rate to ensure internal Power-on Reset signal Brown-out Reset Voltage
D004
SVDD
0.05
--
--
V/ms See Section 4.3 "Power-on Reset (POR)" for details V On-chip voltage regulator enabled. See Section 4.4 "Brown-out Reset (BOR)" for details.
D005A
VBOR
TBD
--
TBD
Legend: TBD = To Be Determined Note 1: This is the limit to which VDD can be lowered in Sleep mode, or during a device Reset, without losing RAM data.
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26.2 DC Characteristics: Power-Down and Supply Current PIC18F87J10 Family (Industrial)
Standard Operating Conditions (unless otherwise stated) Operating temperature -40C TA +85C for industrial Device Power-Down Current (IPD)(1) All devices TBD TBD TBD All devices TBD TBD TBD All devices TBD TBD TBD Legend: Note 1: TBD TBD TBD TBD TBD TBD TBD TBD TBD A A A A A A A A A -40C +25C +85C -40C +25C +85C -40C +25C +85C VDD = 3.3V, (Sleep mode) VDD = 2.5V, (Sleep mode) VDD = 2.0V, (Sleep mode) Typ Max Units Conditions
PIC18F87J10 Family (Industrial) Param No.
2:
3: 4:
TBD = To Be Determined The power-down current in Sleep mode does not depend on the oscillator type. Power-down current is measured with the part in Sleep mode, with all I/O pins in high-impedance state and tied to VDD or VSS and all features that add delta current disabled (such as WDT, Timer1 oscillator, BOR, etc.). The supply current is mainly a function of operating voltage, frequency and mode. Other factors, such as I/O pin loading and switching rate, oscillator type and circuit, internal code execution pattern and temperature, also have an impact on the current consumption. The test conditions for all IDD measurements in active operation mode are: OSC1 = external square wave, from rail-to-rail; all I/O pins tri-stated, pulled to VDD; MCLR = VDD; WDT enabled/disabled as specified. For RC oscillator configurations, current through REXT is not included. The current through the resistor can be estimated by the formula Ir = VDD/2REXT (mA) with REXT in k. Standard, low-cost 32 kHz crystals have an operating temperature range of -10C to +70C. Extended temperature crystals are available at a much higher cost.
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26.2 DC Characteristics: Power-Down and Supply Current PIC18F87J10 Family (Industrial) (Continued)
Standard Operating Conditions (unless otherwise stated) Operating temperature -40C TA +85C for industrial Device Supply Current (IDD)(2,3) All devices TBD TBD TBD All devices TBD TBD TBD All devices TBD TBD TBD All devices TBD TBD TBD All devices TBD TBD TBD All devices TBD TBD TBD Legend: Note 1: TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD A A A A A A A A A A A A A A A A A A -40C +25C +85C -40C +25C +85C -40C +25C +85C -40C +25C +85C -40C +25C +85C -40C +25C +85C VDD = 3.3V VDD = 2.5V FOSC = 31 kHz (RC_IDLE mode, Internal oscillator source) VDD = 2.0V VDD = 3.3V VDD = 2.5V FOSC = 31 kHz (RC_RUN mode, Internal oscillator source) VDD = 2.0V Typ Max Units Conditions
PIC18F87J10 Family (Industrial) Param No.
2:
3: 4:
TBD = To Be Determined The power-down current in Sleep mode does not depend on the oscillator type. Power-down current is measured with the part in Sleep mode, with all I/O pins in high-impedance state and tied to VDD or VSS and all features that add delta current disabled (such as WDT, Timer1 oscillator, BOR, etc.). The supply current is mainly a function of operating voltage, frequency and mode. Other factors, such as I/O pin loading and switching rate, oscillator type and circuit, internal code execution pattern and temperature, also have an impact on the current consumption. The test conditions for all IDD measurements in active operation mode are: OSC1 = external square wave, from rail-to-rail; all I/O pins tri-stated, pulled to VDD; MCLR = VDD; WDT enabled/disabled as specified. For RC oscillator configurations, current through REXT is not included. The current through the resistor can be estimated by the formula Ir = VDD/2REXT (mA) with REXT in k. Standard, low-cost 32 kHz crystals have an operating temperature range of -10C to +70C. Extended temperature crystals are available at a much higher cost.
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26.2 DC Characteristics: Power-Down and Supply Current PIC18F87J10 Family (Industrial) (Continued)
Standard Operating Conditions (unless otherwise stated) Operating temperature -40C TA +85C for industrial Device Supply Current (IDD)(2,3) All devices TBD TBD TBD All devices TBD TBD TBD All devices TBD TBD TBD All devices TBD TBD TBD All devices TBD TBD TBD All devices TBD TBD TBD All devices TBD TBD TBD All devices TBD TBD TBD Legend: Note 1: TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD A A A A A A mA mA mA mA mA mA mA mA mA mA mA mA mA mA mA mA mA mA -40C +25C +85C -40C +25C +85C -40C +25C +85C -40C +25C +85C -40C +25C +85C -40C +25C +85C -40C +25C +85C -40C +25C +85C VDD = 3.3V VDD = 2.5V FOSC = 40 MHZ (PRI_RUN mode, EC oscillator) VDD = 3.3V VDD = 2.5V FOSC = 4 MHz (PRI_RUN mode, EC oscillator) VDD = 2.0V VDD = 3.3V VDD = 2.5V FOSC = 1 MHZ (PRI_RUN mode, EC oscillator) VDD = 2.0V Typ Max Units Conditions
PIC18F87J10 Family (Industrial) Param No.
2:
3: 4:
TBD = To Be Determined The power-down current in Sleep mode does not depend on the oscillator type. Power-down current is measured with the part in Sleep mode, with all I/O pins in high-impedance state and tied to VDD or VSS and all features that add delta current disabled (such as WDT, Timer1 oscillator, BOR, etc.). The supply current is mainly a function of operating voltage, frequency and mode. Other factors, such as I/O pin loading and switching rate, oscillator type and circuit, internal code execution pattern and temperature, also have an impact on the current consumption. The test conditions for all IDD measurements in active operation mode are: OSC1 = external square wave, from rail-to-rail; all I/O pins tri-stated, pulled to VDD; MCLR = VDD; WDT enabled/disabled as specified. For RC oscillator configurations, current through REXT is not included. The current through the resistor can be estimated by the formula Ir = VDD/2REXT (mA) with REXT in k. Standard, low-cost 32 kHz crystals have an operating temperature range of -10C to +70C. Extended temperature crystals are available at a much higher cost.
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26.2 DC Characteristics: Power-Down and Supply Current PIC18F87J10 Family (Industrial) (Continued)
Standard Operating Conditions (unless otherwise stated) Operating temperature -40C TA +85C for industrial Device Supply Current (IDD)(2) All devices TBD TBD TBD All devices TBD TBD TBD All devices TBD TBD TBD All devices TBD TBD TBD Legend: Note 1: TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD mA mA mA mA mA mA mA mA mA mA mA mA -40C +25C +85C -40C +25C +85C -40C +25C +85C -40C +25C +85C VDD = 3.3V VDD = 2.5V VDD = 3.3V VDD = 2.5V FOSC = 4 MHZ. 16 MHz internal (PRI_RUN HSPLL mode) FOSC = 4 MHZ, 16 MHz internal (PRI_RUN HSPLL mode) FOSC = 10 MHZ, 40 MHz internal (PRI_RUN HSPLL mode) FOSC = 10 MHZ, 40 MHz internal (PRI_RUN HSPLL mode) Typ Max Units Conditions
PIC18F87J10 Family (Industrial) Param No.
2:
3: 4:
TBD = To Be Determined The power-down current in Sleep mode does not depend on the oscillator type. Power-down current is measured with the part in Sleep mode, with all I/O pins in high-impedance state and tied to VDD or VSS and all features that add delta current disabled (such as WDT, Timer1 oscillator, BOR, etc.). The supply current is mainly a function of operating voltage, frequency and mode. Other factors, such as I/O pin loading and switching rate, oscillator type and circuit, internal code execution pattern and temperature, also have an impact on the current consumption. The test conditions for all IDD measurements in active operation mode are: OSC1 = external square wave, from rail-to-rail; all I/O pins tri-stated, pulled to VDD; MCLR = VDD; WDT enabled/disabled as specified. For RC oscillator configurations, current through REXT is not included. The current through the resistor can be estimated by the formula Ir = VDD/2REXT (mA) with REXT in k. Standard, low-cost 32 kHz crystals have an operating temperature range of -10C to +70C. Extended temperature crystals are available at a much higher cost.
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26.2 DC Characteristics: Power-Down and Supply Current PIC18F87J10 Family (Industrial) (Continued)
Standard Operating Conditions (unless otherwise stated) Operating temperature -40C TA +85C for industrial Device Supply Current (IDD)(2,3) All devices TBD TBD TBD All devices TBD TBD TBD All devices TBD TBD TBD All devices TBD TBD TBD All devices TBD TBD TBD All devices TBD TBD TBD All devices TBD TBD TBD All devices TBD TBD TBD Legend: Note 1: TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD A A A A A A A A A A A A A A A mA mA mA mA mA mA mA mA mA -40C +25C +85C -40C +25C +85C -40C +25C +85C -40C +25C +85C -40C +25C +85C -40C +25C +85C -40C +25C +85C -40C +25C +85C VDD = 3.3V VDD = 2.5V FOSC = 40 MHz (PRI_IDLE mode, EC oscillator) VDD = 3.3V VDD = 2.5V FOSC = 4 MHz (PRI_IDLE mode, EC oscillator) VDD = 2.0V VDD = 3.3V VDD = 2.5V FOSC = 1 MHz (PRI_IDLE mode, EC oscillator) VDD = 2.0V Typ Max Units Conditions
PIC18F87J10 Family (Industrial) Param No.
2:
3: 4:
TBD = To Be Determined The power-down current in Sleep mode does not depend on the oscillator type. Power-down current is measured with the part in Sleep mode, with all I/O pins in high-impedance state and tied to VDD or VSS and all features that add delta current disabled (such as WDT, Timer1 oscillator, BOR, etc.). The supply current is mainly a function of operating voltage, frequency and mode. Other factors, such as I/O pin loading and switching rate, oscillator type and circuit, internal code execution pattern and temperature, also have an impact on the current consumption. The test conditions for all IDD measurements in active operation mode are: OSC1 = external square wave, from rail-to-rail; all I/O pins tri-stated, pulled to VDD; MCLR = VDD; WDT enabled/disabled as specified. For RC oscillator configurations, current through REXT is not included. The current through the resistor can be estimated by the formula Ir = VDD/2REXT (mA) with REXT in k. Standard, low-cost 32 kHz crystals have an operating temperature range of -10C to +70C. Extended temperature crystals are available at a much higher cost.
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26.2 DC Characteristics: Power-Down and Supply Current PIC18F87J10 Family (Industrial) (Continued)
Standard Operating Conditions (unless otherwise stated) Operating temperature -40C TA +85C for industrial Device Supply Current (IDD)(2,3) All devices TBD TBD TBD All devices TBD TBD TBD All devices TBD TBD TBD All devices TBD TBD TBD All devices TBD TBD TBD All devices TBD TBD TBD Legend: Note 1: TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD A A A A A A A A A A A A A A A A A A -10C +25C +70C -10C +25C +70C -10C +25C +70C -10C +25C +70C -10C +25C +70C -10C +25C +70C VDD = 3.3V VDD = 2.5V FOSC = 32 kHz(4) (SEC_IDLE mode, Timer1 as clock) VDD = 2.0V VDD = 3.3V VDD = 2.5V FOSC = 32 kHz(4) (SEC_RUN mode, Timer1 as clock) VDD = 2.0V Typ Max Units Conditions
PIC18F87J10 Family (Industrial) Param No.
2:
3: 4:
TBD = To Be Determined The power-down current in Sleep mode does not depend on the oscillator type. Power-down current is measured with the part in Sleep mode, with all I/O pins in high-impedance state and tied to VDD or VSS and all features that add delta current disabled (such as WDT, Timer1 oscillator, BOR, etc.). The supply current is mainly a function of operating voltage, frequency and mode. Other factors, such as I/O pin loading and switching rate, oscillator type and circuit, internal code execution pattern and temperature, also have an impact on the current consumption. The test conditions for all IDD measurements in active operation mode are: OSC1 = external square wave, from rail-to-rail; all I/O pins tri-stated, pulled to VDD; MCLR = VDD; WDT enabled/disabled as specified. For RC oscillator configurations, current through REXT is not included. The current through the resistor can be estimated by the formula Ir = VDD/2REXT (mA) with REXT in k. Standard, low-cost 32 kHz crystals have an operating temperature range of -10C to +70C. Extended temperature crystals are available at a much higher cost.
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26.2 DC Characteristics: Power-Down and Supply Current PIC18F87J10 Family (Industrial) (Continued)
Standard Operating Conditions (unless otherwise stated) Operating temperature -40C TA +85C for industrial Device Typ Max Units Conditions
PIC18F87J10 Family (Industrial) Param No. D022 (IWDT)
Module Differential Currents (IWDT, IOSCB, IAD) Watchdog Timer TBD TBD A TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD A A A A A A A A A A A A A A A A A A A A
-40C +25C +85C -40C +25C +85C -40C +25C +85C -40C +25C +85C -40C +25C +85C -40C +25C +85C -40C to +85C -40C to +85C -40C to +85C VDD = 2.0V
VDD = 2.5V
VDD = 3.3V
D025 (IOSCB)
Timer1 Oscillator
VDD = 2.0V
32 kHz on Timer1(3)
VDD = 2.5V
32 kHz on Timer1(3)
VDD = 3.3V VDD = 2.0V VDD = 2.5V VDD = 3.3V
32 kHz on Timer1(3)
D026 (IAD) Legend: Note 1:
A/D Converter
A/D on, not converting
2:
3: 4:
TBD = To Be Determined The power-down current in Sleep mode does not depend on the oscillator type. Power-down current is measured with the part in Sleep mode, with all I/O pins in high-impedance state and tied to VDD or VSS and all features that add delta current disabled (such as WDT, Timer1 oscillator, BOR, etc.). The supply current is mainly a function of operating voltage, frequency and mode. Other factors, such as I/O pin loading and switching rate, oscillator type and circuit, internal code execution pattern and temperature, also have an impact on the current consumption. The test conditions for all IDD measurements in active operation mode are: OSC1 = external square wave, from rail-to-rail; all I/O pins tri-stated, pulled to VDD; MCLR = VDD; WDT enabled/disabled as specified. For RC oscillator configurations, current through REXT is not included. The current through the resistor can be estimated by the formula Ir = VDD/2REXT (mA) with REXT in k. Standard, low-cost 32 kHz crystals have an operating temperature range of -10C to +70C. Extended temperature crystals are available at a much higher cost.
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26.3 DC Characteristics: PIC18F87J10 Family (Industrial)
Standard Operating Conditions (unless otherwise stated) Operating temperature -40C TA +85C for industrial Characteristic Input Low Voltage I/O ports: D030 D030A D031 D032 D033 D033A D034 VIH D040 D040A D041 D042 D043 D043A D044 IIL D060 D061 D063 IPU D070 Note 1: 2: IPURB with Schmitt Trigger buffer MCLR OSC1 OSC1 T13CKI Input Leakage Current(2,3) I/O ports MCLR OSC1 Weak Pull-up Current PORTB weak pull-up current 50 400 A VDD = 3.3V, VPIN = VSS -- -- -- 1 5 5 A A A VSS VPIN VDD, Pin at high-impedance Vss VPIN VDD Vss VPIN VDD with Schmitt Trigger buffer MCLR OSC1 OSC1 T13CKI Input High Voltage I/O ports: with TTL buffer 0.25 VDD + 0.8V 2.0 0.8 VDD 0.8 VDD 0.7 VDD 0.8 VDD 1.6 VDD VDD VDD VDD VDD VDD VDD V V V V V V V HS, HSPLL modes EC mode VDD < 3.3V 3.3V VDD 3.6V with TTL buffer VSS -- VSS VSS VSS VSS VSS 0.15 VDD 0.8 0.2 VDD 0.2 VDD 0.3 VDD 0.2 VDD 0.3 VDD V V V V V V V HS, HSPLL modes EC modes(1) VDD < 3.3V 3.3V VDD 3.6V Min Max Units Conditions DC CHARACTERISTICS Param Symbol No. VIL
3:
In RC oscillator configuration, the OSC1/CLKI pin is a Schmitt Trigger input. It is not recommended that the PICmicro(R) device be driven with an external clock while in RC mode. The leakage current on the MCLR pin is strongly dependent on the applied voltage level. The specified levels represent normal operating conditions. Higher leakage current may be measured at different input voltages. Negative current is defined as current sourced by the pin.
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26.3 DC Characteristics: PIC18F87J10 Family (Industrial) (Continued)
Standard Operating Conditions (unless otherwise stated) Operating temperature -40C TA +85C for industrial Characteristic Output Low Voltage I/O ports OSC2/CLKO (EC, ECIO modes) VOH D090 D092 Output High Voltage(3) I/O ports OSC2/CLKO (RC, RCIO, EC, ECIO modes) Capacitive Loading Specs on Output Pins D100(4) COSC2 OSC2 pin
--
DC CHARACTERISTICS Param Symbol No. VOL D080 D083
Min
Max
Units
Conditions
-- --
0.6 0.6
V V
IOL = 8.5 mA, VDD = 3.3V, -40C to +85C IOL = 1.6 mA, VDD = 3.3V, -40C to +85C IOH = -3.0 mA, VDD = 3.3V, -40C to +85C IOH = -1.3 mA, VDD = 3.3V, -40C to +85C
VDD - 0.7 VDD - 0.7
-- --
V V
15
pF
In HS mode when external clock is used to drive OSC1 To meet the AC Timing Specifications I2CTM Specification
D101 D102 Note 1: 2:
CIO CB
All I/O pins and OSC2 (in RC mode) SCLx, SDAx
-- --
50 400
pF pF
3:
In RC oscillator configuration, the OSC1/CLKI pin is a Schmitt Trigger input. It is not recommended that the PICmicro(R) device be driven with an external clock while in RC mode. The leakage current on the MCLR pin is strongly dependent on the applied voltage level. The specified levels represent normal operating conditions. Higher leakage current may be measured at different input voltages. Negative current is defined as current sourced by the pin.
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TABLE 26-1: MEMORY PROGRAMMING REQUIREMENTS
Standard Operating Conditions (unless otherwise stated) Operating temperature -40C TA +85C for industrial Characteristic Program Flash Memory D130 D131 EP VPR Cell Endurance VDD for Read VDD for Self-Timed Write(1) Self-Timed Write Cycle Time(1) 100 VMIN VMIN -- 10 -- 1K -- -- 10 20 10 -- 3.6 3.6 -- -- -- E/W -40C to +85C V V ms Year Provided no other specifications are violated mA VMIN = Minimum operating voltage VMIN = Minimum operating voltage Min Typ Max Units Conditions DC CHARACTERISTICS Param No. Sym
D132B VPEW D133A TIW D134 D135
TRETD Characteristic Retention IDDP Supply Current during Programming
Data in "Typ" column is at 3.3V, 25C unless otherwise stated. These parameters are for design guidance only and are not tested. Note 1: These specifications apply only to devices in programming modes.
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TABLE 26-2: COMPARATOR SPECIFICATIONS
Operating Conditions: 3.0V < VDD < 3.6V, -40C < TA < +85C (unless otherwise stated) Param No. D300 D301 D302 300 301 * Note 1: Sym VIOFF VICM CMRR TRESP TMC2OV Characteristics Input Offset Voltage Input Common Mode Voltage* Common Mode Rejection Ratio* Response Time(1)* Comparator Mode Change to Output Valid* Min -- 0 55 -- -- Typ 5.0 -- -- 150 -- Max 10 VDD - 1.5 -- 400 10 Units mV V dB ns s Comments
These parameters are characterized but not tested. Response time measured with one comparator input at (VDD - 1.5)/2, while the other input transitions from VSS to VDD.
TABLE 26-3:
VOLTAGE REFERENCE SPECIFICATIONS
Operating Conditions: 3.0V < VDD < 3.6V, -40C < TA < +85C (unless otherwise stated) Param No. D310 D311 D312 310 Note 1: Sym VRES VRAA VRUR TSET Characteristics Resolution Absolute Accuracy Unit Resistor Value (R) Settling Time(1) Min VDD/24 -- -- -- Typ -- -- 2k -- Max VDD/32 1/2 -- 10 Units LSb LSb s Comments
Settling time measured while CVRR = 1 and CVR3:CVR0 transitions from `0000' to `1111'.
TABLE 26-4:
INTERNAL VOLTAGE REGULATOR SPECIFICATIONS
Operating Conditions: -40C < TA < +85C (unless otherwise stated) Param No. Sym VRGOUT CEFC * Characteristics Regulator Output Voltage External Filter Capacitor Value Min -- 1 Typ 2.5 10 Max -- -- Units V F Capacitor must be low series resistance Comments
These parameters are characterized but not tested. Parameter numbers not yet assigned for these specifications.
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26.4
26.4.1
AC (Timing) Characteristics
TIMING PARAMETER SYMBOLOGY
The timing parameter symbols have been created following one of the following formats: 1. TppS2ppS 2. TppS T F Frequency Lowercase letters (pp) and their meanings: pp cc CCP1 ck CLKO cs CS di SDI do SDO dt Data in io I/O port mc MCLR Uppercase letters and their meanings: S F Fall H High I Invalid (High-impedance) L Low I2C only AA output access BUF Bus free TCC:ST (I2C specifications only) CC HD Hold ST DAT DATA input hold STA Start condition 3. TCC:ST 4. Ts T (I2C specifications only) (I2C specifications only) Time
osc rd rw sc ss t0 t1 wr
OSC1 RD RD or WR SCK SS T0CKI T13CKI WR
P R V Z High Low
Period Rise Valid High-impedance High Low
SU STO
Setup Stop condition
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26.4.2 TIMING CONDITIONS
The temperature and voltages specified in Table 26-5 apply to all timing specifications unless otherwise noted. Figure 26-2 specifies the load conditions for the timing specifications.
TABLE 26-5:
TEMPERATURE AND VOLTAGE SPECIFICATIONS - AC
Standard Operating Conditions (unless otherwise stated) Operating temperature -40C TA +85C for industrial Operating voltage VDD range as described in DC spec Section 26.1 and Section 26.3.
AC CHARACTERISTICS
FIGURE 26-2:
LOAD CONDITIONS FOR DEVICE TIMING SPECIFICATIONS
Load Condition 1 VDD/2 CL VSS Pin VSS CL RL = 464 CL = 50 pF for all pins except OSC2/CLKO and including D and E outputs as ports Load Condition 2
RL
Pin
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26.4.3 TIMING DIAGRAMS AND SPECIFICATIONS EXTERNAL CLOCK TIMING (ALL MODES EXCEPT PLL)
Q4 Q1 Q2 Q3 Q4 Q1
FIGURE 26-3:
OSC1
1 2 3 3 4 4
CLKO
TABLE 26-6:
Param. No. 1A 1 2 3 4 Note 1:
EXTERNAL CLOCK TIMING REQUIREMENTS
Characteristic External CLKI Frequency(1) Oscillator Frequency
(1)
Symbol FOSC TOSC TCY TOSL, TOSH TOSR, TOSF
Min DC DC 25 25 100 10 --
Max 40 40 -- 250 -- -- 7.5
Units MHz MHz ns ns ns ns ns
Conditions HS Oscillator mode HS Oscillator mode HS Oscillator mode HS Oscillator mode TCY = 4/FOSC, Industrial HS Oscillator mode HS Oscillator mode
External CLKI Period(1) Oscillator Period(1) Instruction Cycle Time(1) External Clock in (OSC1) High or Low Time External Clock in (OSC1) Rise or Fall Time
Instruction cycle period (TCY) equals four times the input oscillator time base period for all configurations except PLL. All specified values are based on characterization data for that particular oscillator type under standard operating conditions with the device executing code. Exceeding these specified limits may result in an unstable oscillator operation and/or higher than expected current consumption. All devices are tested to operate at "min." values with an external clock applied to the OSC1/CLKI pin. When an external clock input is used, the "max." cycle time limit is "DC" (no clock) for all devices.
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TABLE 26-7:
Param No. F10 F11 F12 F13 Sym
PLL CLOCK TIMING SPECIFICATIONS (VDD = 2.5V TO 3.6V)
Characteristic Min 4 16 -- -2 Typ -- -- -- -- Max 10 40 2 +2 Units Conditions
FOSC Oscillator Frequency Range FSYS On-Chip VCO System Frequency trc CLK PLL Start-up Time (Lock Time) CLKO Stability (Jitter)
MHz HS mode only MHz HS mode only ms %
Data in "Typ" column is at 5V, 25C, unless otherwise stated. These parameters are for design guidance only and are not tested.
TABLE 26-8:
Param No.
AC CHARACTERISTICS: INTERNAL RC ACCURACY PIC18F87J10 FAMILY (INDUSTRIAL)
Characteristic Min Typ -- Max 35.938 Units kHz Conditions -40C to +85C, VDD = 2.0-3.3V
INTRC Accuracy @ Freq = 31 kHz(1) 26.562 Note 1:
INTRC frequency after calibration. Change of INTRC frequency as VDD changes.
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FIGURE 26-4: CLKO AND I/O TIMING
Q4 OSC1 10 CLKO 13 14 I/O pin (Input) 17 I/O pin (Output) Old Value 20, 21 Note: Refer to Figure 26-2 for load conditions. 15 New Value 19 18 12 16 11 Q1 Q2 Q3
TABLE 26-9:
Param No. 10 11 12 13 14 15 16 17 18 18A 19 20 20A 21 21A 22 23 TINP TRBP TIOF
CLKO AND I/O TIMING REQUIREMENTS
Characteristic Min -- -- -- -- -- 0.25 TCY + 25 0 -- 100 200 0 -- -- Port Output Fall Time INT pin High or Low Time RB7:RB4 Change INT High or Low Time -- -- TCY TCY Typ TBD TBD TBD TBD -- -- -- 50 -- -- -- 10 -- 10 -- -- -- Max TBD TBD TBD TBD 0.5 TCY + 20 -- -- 150 -- -- -- 25 60 25 60 -- -- Units Conditions ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns VDD = 2.0V VDD = 2.0V VDD = 2.0V
Symbol
TOSH2CKL OSC1 to CLKO TOSH2CKH OSC1 to CLKO TCKR TCKF CLKO Rise Time CLKO Fall Time
TCKL2IOV CLKO to Port Out Valid TIOV2CKH Port In Valid before CLKO TCKH2IOI TOSH2IOI Port In Hold after CLKO OSC1 (Q2 cycle) to Port Input Invalid (I/O in hold time) TOSH2IOV OSC1 (Q1 cycle) to Port Out Valid
TIOV2OSH Port Input Valid to OSC1 (I/O in setup time) TIOR Port Output Rise Time
Legend: TBD = To Be Determined These parameters are asynchronous events not related to any internal clock edges.
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FIGURE 26-5: PROGRAM MEMORY READ TIMING DIAGRAM
Q1 OSC1 A<19:16> BA0 AD<15:0>
Address Address Data from External Address Address
Q2
Q3
Q4
Q1
Q2
150 151
160 155 166 167 168
163 162 161
ALE 164
169 171 CE 171A OE 165 Operating Conditions: 2.0V < VCC < 3.6V, -40C < TA < +125C unless otherwise stated.
TABLE 26-10: CLKO AND I/O TIMING REQUIREMENTS
Param. No 150 151 155 160 161 162 163 164 165 166 167 168 169 171 171A Symbol TadV2alL TalL2adl TalL2oeL TadZ2oeL Characteristics Address Out Valid to ALE (address setup time) ALE to Address Out Invalid (address hold time) ALE to OE AD high-Z to OE (bus release to OE) Min 0.25 TCY - 10 5 10 0 0.125 TCY - 5 20 0 -- 0.5 TCY - 5 -- 0.75 TCY - 25 0.625 TCY - 10 0.25 TCY - 20 -- Typ -- -- 0.125 TCY -- -- -- -- TCY 0.5 TCY 0.25 TCY -- -- -- -- -- Max -- -- -- -- -- -- -- -- -- -- -- 0.5 TCY - 25 0.625 TCY + 10 -- 10 Units ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns
ToeH2adD OE to AD Driven TadV2oeH LS Data Valid before OE (data setup time) ToeH2adl TalH2alL TalH2alH Tacc Toe TalL2oeH TalH2csL OE to Data In Invalid (data hold time) ALE Pulse Width ALE to ALE (cycle time) Address Valid to Data Valid OE to Data Valid ALE to OE Chip Enable Active to ALE
ToeL2oeH OE Pulse Width
TubL2oeH AD Valid to Chip Enable Active
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FIGURE 26-6: PROGRAM MEMORY WRITE TIMING DIAGRAM
Q1 OSC1 A<19:16> BA0
Address Address
Q2
Q3
Q4
Q1
Q2
166 AD<15:0>
Address Data Address
150 151 ALE 171 CE 171A
153 156
154 WRH or WRL UB or LB 157 157A
Operating Conditions: 2.0V < VCC < 3.6V, -40C < TA < +125C unless otherwise stated.
TABLE 26-11: PROGRAM MEMORY WRITE TIMING REQUIREMENTS
Param. No 150 151 153 154 156 157 157A 166 171 171A Symbol TadV2alL TalL2adl TwrH2adl TwrL Characteristics Address Out Valid to ALE (address setup time) ALE to Address Out Invalid (address hold time) WRn to Data Out Invalid (data hold time) WRn Pulse Width Min 0.25 TCY - 10 5 5 0.5 TCY - 5 0.5 TCY - 10 0.25 TCY 0.125 TCY - 5 -- 0.25 TCY - 20 -- Typ -- -- -- 0.5 TCY -- -- -- 0.25 TCY -- -- Max -- -- -- -- -- -- -- -- -- 10 Units ns ns ns ns ns ns ns ns ns ns
TadV2wrH Data Valid before WRn (data setup time) TbsV2wrL Byte Select Valid before WRn (byte select setup time) TwrH2bsI TalH2alH TalH2csL WRn to Byte Select Invalid (byte select hold time) ALE to ALE (cycle time) Chip Enable Active to ALE
TubL2oeH AD Valid to Chip Enable Active
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FIGURE 26-7: RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER AND POWER-UP TIMER TIMING
VDD MCLR Internal POR PWRT Time-out Oscillator Time-out Internal Reset Watchdog Timer Reset 34 I/O pins Note: Refer to Figure 26-2 for load conditions. 33 32 30
31
34
FIGURE 26-8:
VDD VIRVST Enable Internal Reference Voltage Internal Reference Voltage Stable
BROWN-OUT RESET TIMING
BVDD 35 VBGAP = 1.2V
36
TABLE 26-12: RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER, POWER-UP TIMER AND BROWN-OUT RESET REQUIREMENTS
Param. Symbol No. 30 31 32 33 34 38 39 TMCL TWDT TOST TPWRT TIOZ TCSD TIOBST Characteristic MCLR Pulse Width (low) Watchdog Timer Time-out Period (no postscaler) Oscillation Start-up Timer Period Power-up Timer Period I/O High-Impedance from MCLR Low or Watchdog Timer Reset CPU Start-up Time Time for INTOSC to Stabilize Min 2 3.4 1024 TOSC 55.6 -- -- -- Typ -- 4.0 -- 65.5 2 200 1 Max -- 4.6 1024 TOSC 75 -- -- -- Units s ms -- ms s s s TOSC = OSC1 period Conditions
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FIGURE 26-9: TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS
T0CKI
40
41
42 T1OSO/T13CKI
45
46
47 TMR0 or TMR1 Note: Refer to Figure 26-2 for load conditions.
48
TABLE 26-13: TIMER0 AND TIMER1 EXTERNAL CLOCK REQUIREMENTS
Param No. 40 41 42 Symbol TT0H TT0L TT0P Characteristic T0CKI High Pulse Width T0CKI Low Pulse Width T0CKI Period No prescaler With prescaler No prescaler With prescaler No prescaler With prescaler Min 0.5 TCY + 20 10 0.5 TCY + 20 10 TCY + 10 Greater of: 20 ns or (TCY + 40)/N 0.5 TCY + 20 10 30 0.5 TCY + 5 10 30 Greater of: 20 ns or (TCY + 40)/N 60 DC 2 TOSC Max -- -- -- -- -- -- Units ns ns ns ns ns ns N = prescale value (1, 2, 4,..., 256) Conditions
45
TT1H
T13CKI High Synchronous, no prescaler Time Synchronous, with prescaler Asynchronous T13CKI Low Synchronous, no prescaler Time Synchronous, with prescaler Asynchronous T13CKI Input Synchronous Period Asynchronous
-- -- -- -- -- -- --
ns ns ns ns ns ns ns N = prescale value (1, 2, 4, 8)
46
TT1L
47
TT1P
-- 50 7 TOSC
ns kHz --
FT1 48
T13CKI Oscillator Input Frequency Range
TCKE2TMRI Delay from External T13CKI Clock Edge to Timer Increment
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FIGURE 26-10: CAPTURE/COMPARE/PWM TIMINGS (INCLUDING ECCP MODULES)
CCPx (Capture Mode)
50 52
51
CCPx (Compare or PWM Mode) 53 Note: Refer to Figure 26-2 for load conditions. 54
TABLE 26-14: CAPTURE/COMPARE/PWM REQUIREMENTS (INCLUDING ECCP MODULES)
Param Symbol No. 50 51 52 53 54 TCCL TCCH TCCP TCCR TCCF Characteristic CCPx Input Low No prescaler Time With prescaler CCPx Input High Time No prescaler With prescaler Min 0.5 TCY + 20 10 0.5 TCY + 20 10 3 TCY + 40 N -- -- Max -- -- -- -- -- 25 25 Units ns ns ns ns ns ns ns N = prescale value (1, 4 or 16) Conditions
CCPx Input Period CCPx Output Fall Time CCPx Output Fall Time
TABLE 26-15: PARALLEL SLAVE PORT REQUIREMENTS
Param. No. 62 63 64 65 66 Symbol TdtV2wrH TwrH2dtI TrdL2dtV TrdH2dtI TibfINH Characteristic Data In Valid before WR or CS (setup time) WR or CS to Data-In Invalid (hold time) RD and CS to Data-Out Valid RD or CS to Data-Out Invalid Inhibit of the IBF Flag bit being Cleared from WR or CS Min 20 20 -- 10 -- Max -- -- 80 30 3 TCY Units ns ns ns ns Conditions
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FIGURE 26-11:
SSx 70 SCKx (CKP = 0) 71 72 78 SCKx (CKP = 1) 79 78 79
EXAMPLE SPITM MASTER MODE TIMING (CKE = 0)
80 SDOx MSb 75, 76 SDIx MSb In 74 73 Note: Refer to Figure 26-2 for load conditions. bit 6 - - - - 1
bit 6 - - - - - - 1
LSb
LSb In
TABLE 26-16: EXAMPLE SPITM MODE REQUIREMENTS (MASTER MODE, CKE = 0)
Param No. 70 71 71A 72 72A 73 73A 74 75 76 78 79 80 Note 1: 2: TDIV2SCH, TDIV2SCL TB2B TSCH2DIL, TSCL2DIL TDOR TDOF TSCR TSCF TSCL Symbol TSSL2SCH, TSSL2SCL TSCH Characteristic SSx to SCKx or SCKx Input SCKx Input High Time (Slave mode) SCKx Input Low Time (Slave mode) Continuous Single Byte Continuous Single Byte Min TCY 1.25 TCY + 30 40 1.25 TCY + 30 40 100 1.5 TCY + 40 100 -- -- -- -- -- Max Units -- -- -- -- -- -- -- -- 25 25 25 25 50 ns ns ns ns ns ns ns ns ns ns ns ns ns (Note 2) (Note 1) (Note 1) Conditions
Setup Time of SDIx Data Input to SCKx Edge Last Clock Edge of Byte 1 to the 1st Clock Edge of Byte 2 Hold Time of SDIx Data Input to SCKx Edge SDOx Data Output Rise Time SDOx Data Output Fall Time SCKx Output Rise Time (Master mode) SCKx Output Fall Time (Master mode)
TSCH2DOV, SDOx Data Output Valid after SCKx Edge TSCL2DOV Requires the use of Parameter #73A. Only if Parameter #71A and #72A are used.
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FIGURE 26-12:
SSx 81 SCKx (CKP = 0) 71 73 SCKx (CKP = 1) 80 78 72 79
EXAMPLE SPITM MASTER MODE TIMING (CKE = 1)
SDOx
MSb 75, 76
bit 6 - - - - - - 1
LSb
SDIx
MSb In 74
bit 6 - - - - 1
LSb In
Note:
Refer to Figure 26-2 for load conditions.
TABLE 26-17: EXAMPLE SPITM MODE REQUIREMENTS (MASTER MODE, CKE = 1)
Param. No. 71 71A 72 72A 73 73A 74 75 76 78 79 80 81 Note 1: 2: TDIV2SCH, TDIV2SCL TB2B TSCH2DIL, TSCL2DIL TDOR TDOF TSCR TSCF TSCL Symbol TSCH Characteristic SCKx Input High Time (Slave mode) SCKx Input Low Time (Slave mode) Continuous Single Byte Continuous Single Byte Min 1.25 TCY + 30 40 1.25 TCY + 30 40 100 1.5 TCY + 40 100 -- -- -- -- -- TCY Max Units -- -- -- -- -- -- -- 25 25 25 25 50 -- ns ns ns ns ns ns ns ns ns ns ns ns ns (Note 2) (Note 1) (Note 1) Conditions
Setup Time of SDIx Data Input to SCKx Edge Last Clock Edge of Byte 1 to the 1st Clock Edge of Byte 2 Hold Time of SDIx Data Input to SCKx Edge SDOx Data Output Rise Time SDOx Data Output Fall Time SCKx Output Rise Time (Master mode) SCKx Output Fall Time (Master mode)
TSCH2DOV, SDOx Data Output Valid after SCKx Edge TSCL2DOV TDOV2SCH, SDOx Data Output Setup to SCKx Edge TDOV2SCL Requires the use of Parameter #73A. Only if Parameter #71A and #72A are used.
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FIGURE 26-13:
SSx 70 SCKx (CKP = 0) 71 72 83
EXAMPLE SPITM SLAVE MODE TIMING (CKE = 0)
78
79
SCKx (CKP = 1) 80 SDOx MSb 75, 76 SDIx SDI MSb In 74 73 Note: Refer to Figure 26-2 for load conditions. bit 6 - - - - 1 LSb In 79 bit 6 - - - - - - 1 78 LSb 77
TABLE 26-18: EXAMPLE SPITM MODE REQUIREMENTS (SLAVE MODE TIMING, CKE = 0)
Param No. 70 71 71A 72 72A 73 73A 74 75 76 77 78 79 80 83 Note 1: 2: TSCL Symbol Characteristic Min TCY Continuous Single Byte Continuous Single Byte 1.25 TCY + 30 40 1.25 TCY + 30 40 100 Max Units Conditions -- -- -- -- -- -- -- -- 25 25 50 25 25 50 -- ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns (Note 2) (Note 1) (Note 1)
TSSL2SCH, SSx to SCKx or SCKx Input TSSL2SCL TSCH SCKx Input High Time (Slave mode) SCKx Input Low Time (Slave mode)
TDIV2SCH, Setup Time of SDIx Data Input to SCKx Edge TDIV2SCL TB2B TSCH2DIL, Hold Time of SDIx Data Input to SCKx Edge TSCL2DIL TDOR TDOF TSCR TSCF SDOx Data Output Rise Time SDOx Data Output Fall Time SCKx Output Rise Time (Master mode) SCKx Output Fall Time (Master mode)
Last Clock Edge of Byte 1 to the First Clock Edge of Byte 2 1.5 TCY + 40 100 -- -- 10 -- -- -- 1.5 TCY + 40
TSSH2DOZ SSx to SDOx Output High-impedance
TSCH2DOV, SDOx Data Output Valid after SCKx Edge TSCL2DOV TSCH2SSH, SSx after SCKx Edge TSCL2SSH Requires the use of Parameter #73A. Only if Parameter #71A and #72A are used.
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FIGURE 26-14:
SSx
EXAMPLE SPITM SLAVE MODE TIMING (CKE = 1)
82
SCKx (CKP = 0)
70 83 71 72
SCKx (CKP = 1) 80
SDOx
MSb 75, 76
bit 6 - - - - - - 1
LSb 77
SDIx SDI
MSb In
bit 6 - - - - 1
LSb In
Note:
74 Refer to Figure 26-2 for load conditions.
TABLE 26-19: EXAMPLE SPITM SLAVE MODE REQUIREMENTS (CKE = 1)
Param No. 70 71 71A 72 72A 73A 74 75 76 77 78 79 80 82 83 TB2B TSCL Symbol Characteristic Min TCY Continuous Single Byte Continuous Single Byte 1.25 TCY + 30 40 1.25 TCY + 30 40 100 -- -- 10 -- -- -- -- 1.5 TCY + 40 Max Units Conditions -- -- -- -- -- -- -- 25 25 50 25 25 50 50 -- ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns (Note 1) (Note 2) (Note 1)
TSSL2SCH, SSx to SCKx or SCKx Input TSSL2SCL TSCH SCKx Input High Time (Slave mode) SCKx Input Low Time (Slave mode)
Last Clock Edge of Byte 1 to the First Clock Edge of Byte 2 1.5 TCY + 40
TSCH2DIL, Hold Time of SDIx Data Input to SCKx Edge TSCL2DIL TDOR TDOF TSCR TSCF SDOx Data Output Rise Time SDOx Data Output Fall Time SCKx Output Rise Time (Master mode) SCKx Output Fall Time (Master mode)
TSSH2DOZ SSx to SDOx Output High-Impedance
TSCH2DOV, SDOx Data Output Valid after SCKx Edge TSCL2DOV TSSL2DOV SDOx Data Output Valid after SSx Edge TSCH2SSH, SSx after SCKx Edge TSCL2SSH Requires the use of Parameter #73A. Only if Parameter #71A and #72A are used.
Note 1: 2:
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FIGURE 26-15: I2CTM BUS START/STOP BITS TIMING
SCLx 90 SDAx
91 92
93
Start Condition
Stop Condition
Note:
Refer to Figure 26-2 for load conditions.
TABLE 26-20: I2CTM BUS START/STOP BITS REQUIREMENTS (SLAVE MODE)
Param. Symbol No. 90 91 92 93 TSU:STA THD:STA TSU:STO Characteristic Start Condition Setup Time Start Condition Hold Time Stop Condition Setup Time THD:STO Stop Condition Hold Time 100 kHz mode 400 kHz mode 100 kHz mode 400 kHz mode 100 kHz mode 400 kHz mode 100 kHz mode 400 kHz mode Min 4700 600 4000 600 4700 600 4000 600 Max -- -- -- -- -- -- -- -- ns ns ns Units ns Conditions Only relevant for Repeated Start condition After this period, the first clock pulse is generated
FIGURE 26-16:
I2CTM BUS DATA TIMING
103 100 101 102
SCLx
90 91 106 107 92
SDAx In
110 109 109
SDAx Out Note: Refer to Figure 26-2 for load conditions.
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TABLE 26-21: I2CTM BUS DATA REQUIREMENTS (SLAVE MODE)
Param. No. 100 Symbol THIGH Characteristic Clock High Time 100 kHz mode 400 kHz mode SSP Module 101 TLOW Clock Low Time 100 kHz mode 400 kHz mode SSP Module 102 TR SDAx and SCLx Rise Time 100 kHz mode 400 kHz mode 103 TF SDAx and SCLx Fall Time 100 kHz mode 400 kHz mode 90 91 106 107 92 109 110 TSU:STA THD:STA THD:DAT TSU:DAT TSU:STO TAA TBUF Start Condition Setup Time 100 kHz mode 400 kHz mode Start Condition Hold Time Data Input Hold Time Data Input Setup Time 100 kHz mode 400 kHz mode 100 kHz mode 400 kHz mode 100 kHz mode 400 kHz mode Stop Condition Setup Time 100 kHz mode 400 kHz mode Output Valid from Clock Bus Free Time 100 kHz mode 400 kHz mode 100 kHz mode 400 kHz mode D102 Note 1: 2: CB Bus Capacitive Loading Min 4.0 0.6 1.5 TCY 4.7 1.3 1.5 TCY -- 20 + 0.1 CB -- 20 + 0.1 CB 4.7 0.6 4.0 0.6 0 0 250 100 4.7 0.6 -- -- 4.7 1.3 -- Max -- -- -- -- -- -- 1000 300 300 300 -- -- -- -- -- 0.9 -- -- -- -- 3500 -- -- -- 400 ns ns ns ns s s s s ns s ns ns s s ns ns s s pF Time the bus must be free before a new transmission can start (Note 1) (Note 2) CB is specified to be from 10 to 400 pF Only relevant for Repeated Start condition After this period, the first clock pulse is generated CB is specified to be from 10 to 400 pF s s PIC18F87J10 must operate at a minimum of 1.5 MHz PIC18F87J10 must operate at a minimum of 10 MHz Units s s Conditions PIC18F87J10 must operate at a minimum of 1.5 MHz PIC18F87J10 must operate at a minimum of 10 MHz
As a transmitter, the device must provide this internal minimum delay time to bridge the undefined region (min. 300 ns) of the falling edge of SCLx to avoid unintended generation of Start or Stop conditions. A Fast mode I2CTM bus device can be used in a Standard mode I2C bus system, but the requirement, TSU:DAT 250 ns, must then be met. This will automatically be the case if the device does not stretch the LOW period of the SCLx signal. If such a device does stretch the LOW period of the SCLx signal, it must output the next data bit to the SDAx line, TR max. + TSU:DAT = 1000 + 250 = 1250 ns (according to the Standard mode I2C bus specification), before the SCLx line is released.
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FIGURE 26-17: MASTER SSP I2CTM BUS START/STOP BITS TIMING WAVEFORMS
SCLx 90 SDAx
91 92
93
Start Condition Note: Refer to Figure 26-2 for load conditions.
Stop Condition
TABLE 26-22: MASTER SSP I2CTM BUS START/STOP BITS REQUIREMENTS
Param. Symbol No. 90 TSU:STA Characteristic Start Condition Setup Time 91 THD:STA Start Condition Hold Time 92 TSU:STO Stop Condition Setup Time 93 THD:STO Stop Condition Hold Time Note 1: 100 kHz mode 400 kHz mode 1 MHz mode(1) 100 kHz mode 400 kHz mode 1 MHz mode(1) 100 kHz mode 400 kHz mode 1 MHz mode(1) 100 kHz mode 400 kHz mode 1 MHz mode(1) Min 2(TOSC)(BRG + 1) 2(TOSC)(BRG + 1) 2(TOSC)(BRG + 1) 2(TOSC)(BRG + 1) 2(TOSC)(BRG + 1) 2(TOSC)(BRG + 1) 2(TOSC)(BRG + 1) 2(TOSC)(BRG + 1) 2(TOSC)(BRG + 1) 2(TOSC)(BRG + 1) 2(TOSC)(BRG + 1) 2(TOSC)(BRG + 1) Max -- -- -- -- -- -- -- -- -- -- -- -- ns ns ns Units ns Conditions Only relevant for Repeated Start condition After this period, the first clock pulse is generated
Maximum pin capacitance = 10 pF for all I2CTM pins.
FIGURE 26-18:
MASTER SSP I2CTM BUS DATA TIMING
103 100 101 102
SCLx SDAx In
90
91
106
107
92
109
109
110
SDAx Out Note: Refer to Figure 26-2 for load conditions.
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TABLE 26-23: MASTER SSP I2CTM BUS DATA REQUIREMENTS
Param. Symbol No. 100 THIGH Characteristic Clock High Time 100 kHz mode 400 kHz mode 1 MHz mode(1) 101 TLOW Clock Low Time 100 kHz mode 400 kHz mode 1 MHz mode 102 TR
(1)
Min 2(TOSC)(BRG + 1) 2(TOSC)(BRG + 1) 2(TOSC)(BRG + 1) 2(TOSC)(BRG + 1) 2(TOSC)(BRG + 1) 2(TOSC)(BRG + 1) -- 20 + 0.1 CB -- -- 20 + 0.1 CB -- 2(TOSC)(BRG + 1) 2(TOSC)(BRG + 1) 2(TOSC)(BRG + 1) 2(TOSC)(BRG + 1) 2(TOSC)(BRG + 1) 2(TOSC)(BRG + 1) 0 0 TBD 250 100 TBD 2(TOSC)(BRG + 1) 2(TOSC)(BRG + 1) 2(TOSC)(BRG + 1) -- -- -- 4.7 1.3 TBD --
Max -- -- -- -- -- -- 1000 300 300 300 300 100 -- -- -- -- -- -- -- 0.9 -- -- -- -- -- -- -- 3500 1000 -- -- -- -- 400
Units ms ms ms ms ms ms ns ns ns ns ns ns ms ms ms ms ms ms ns ms ns ns ns ns ms ms ms ns ns ns ms ms ms pF
Conditions
SDAx and SCLx 100 kHz mode Rise Time 400 kHz mode 1 MHz mode(1) SDAx and SCLx 100 kHz mode Fall Time 400 kHz mode 1 MHz mode(1) Start Condition Setup Time 100 kHz mode 400 kHz mode 1 MHz mode(1) 100 kHz mode 400 kHz mode 1 MHz mode(1) 100 kHz mode 400 kHz mode 1 MHz mode(1) 100 kHz mode 400 kHz mode 1 MHz mode(1) 100 kHz mode 400 kHz mode 1 MHz mode(1) 100 kHz mode 400 kHz mode 1 MHz mode
(1)
CB is specified to be from 10 to 400 pF
103
TF
CB is specified to be from 10 to 400 pF
90
TSU:STA
Only relevant for Repeated Start condition After this period, the first clock pulse is generated
91
THD:STA Start Condition Hold Time
106
THD:DAT Data Input Hold Time
107
TSU:DAT
Data Input Setup Time
(Note 2)
92
TSU:STO Stop Condition Setup Time
109
TAA
Output Valid from Clock
110
TBUF
Bus Free Time
100 kHz mode 400 kHz mode 1 MHz mode(1)
Time the bus must be free before a new transmission can start
D102
CB
Bus Capacitive Loading
Legend: TBD = To Be Determined Note 1: Maximum pin capacitance = 10 pF for all I2CTM pins. 2: A Fast mode I2C bus device can be used in a Standard mode I2C bus system, but parameter #107 250 ns must then be met. This will automatically be the case if the device does not stretch the LOW period of the SCLx signal. If such a device does stretch the LOW period of the SCLx signal, it must output the next data bit to the SDAx line, parameter #102 + parameter #107 = 1000 + 250 = 1250 ns (for 100 kHz mode), before the SCLx line is released.
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FIGURE 26-19:
TXx/CKx pin RXx/DTx pin 120 Note: Refer to Figure 26-2 for load conditions.
EUSART SYNCHRONOUS TRANSMISSION (MASTER/SLAVE) TIMING
121
121
122
TABLE 26-24: EUSART SYNCHRONOUS TRANSMISSION REQUIREMENTS
Param No. 120 121 122 Symbol Characteristic Min Max Units Conditions
TCKH2DTV SYNC XMIT (MASTER and SLAVE) Clock High to Data Out Valid TCKRF TDTRF Clock Out Rise Time and Fall Time (Master mode) Data Out Rise Time and Fall Time
-- -- --
40 20 20
ns ns ns
FIGURE 26-20:
TXx/CKx pin RXx/DTx pin
EUSART SYNCHRONOUS RECEIVE (MASTER/SLAVE) TIMING
125
126
Note:
Refer to Figure 26-2 for load conditions.
TABLE 26-25: EUSART SYNCHRONOUS RECEIVE REQUIREMENTS
Param. No. 125 126 Symbol Characteristic Min Max Units Conditions
TDTV2CKL SYNC RCV (MASTER and SLAVE) Data Hold before CKx (DTx hold time) TCKL2DTL Data Hold after CKx (DTx hold time)
10 15
-- --
ns ns
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TABLE 26-26: A/D CONVERTER CHARACTERISTICS: PIC18F87J10 FAMILY (INDUSTRIAL)
Param Symbol No. A01 A03 A04 A06 A07 A10 A20 A21 A22 A25 A30 A50 NR EIL EDL EOFF EGN -- VREF VREFH VREFL VAIN ZAIN IREF Characteristic Resolution Integral Linearity Error Differential Linearity Error Offset Error Gain Error Monotonicity Reference Voltage Range (VREFH - VREFL) Reference Voltage High Reference Voltage Low Analog Input Voltage Recommended Impedance of Analog Voltage Source VREF Input Current(2) 1.8 3 VSS VSS - 0.3V VREFL -- -- -- Min -- -- -- -- -- Typ -- -- -- -- -- Guaranteed(1) -- -- -- -- -- -- -- -- -- -- VREFH VDD - 3.0V VREFH 2.5 5 150 Max 10 <1 <1 <1.5 <1 Units bit Conditions VREF 3.0V
LSb VREF 3.0V LSb VREF 3.0V LSb VREF 3.0V LSb VREF 3.0V -- V V V V V k A A During VAIN acquisition. During A/D conversion cycle. VDD < 3.0V VDD 3.0V VSS VAIN VREF
Note 1: 2:
The A/D conversion result never decreases with an increase in the input voltage and has no missing codes. VREFH current is from RA3/AN3/VREF+ pin or VDD, whichever is selected as the VREFH source. VREFL current is from RA2/AN2/VREF- pin or VSS, whichever is selected as the VREFL source.
FIGURE 26-21:
A/D CONVERSION TIMING
BSF ADCON0, GO (Note 2) Q4 130 A/D CLK 132 131
A/D DATA
9
8
7
...
...
2
1
0
ADRES
OLD_DATA
NEW_DATA
ADIF GO SAMPLING STOPPED DONE
TCY
SAMPLE
Note
1: 2:
If the A/D clock source is selected as RC, a time of TCY is added before the A/D clock starts. This allows the SLEEP instruction to be executed. This is a minimal RC delay (typically 100 ns), which also disconnects the holding capacitor from the analog input.
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TABLE 26-27: A/D CONVERSION REQUIREMENTS
Param Symbol No. 130 131 132 135 TBD TAD TCNV TACQ TSWC TDIS Characteristic A/D Clock Period Conversion Time (not including acquisition time) (Note 2) Acquisition Time (Note 3) Switching Time from Convert Sample Discharge Time Min 0.7 TBD 11 1.4 TBD -- 0.2 Max 25.0(1) 1 12 -- -- (Note 4) -- s Units s s TAD s s -40C to +85C 0C to +85C Conditions TOSC based, VREF 3.0V A/D RC mode
Legend: Note 1: 2: 3: 4:
TBD = To Be Determined The time of the A/D clock period is dependent on the device frequency and the TAD clock divider. ADRES registers may be read on the following TCY cycle. The time for the holding capacitor to acquire the "New" input voltage when the voltage changes full scale after the conversion (VDD to VSS or VSS to VDD). The source impedance (RS) on the input channels is 50. On the following cycle of the device clock.
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NOTES:
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27.0
27.1
PACKAGING INFORMATION
Package Marking Information
64-Lead TQFP
Example
XXXXXXXXXX XXXXXXXXXX XXXXXXXXXX YYWWNNN
18F67J10 -I/PT e3 0510017
80-Lead TQFP
Example
XXXXXXXXXXXX XXXXXXXXXXXX YYWWNNN
PIC18F87J10 -I/PT e3 0510017
Legend: XX...X Y YY WW NNN
e3
*
Customer-specific information Year code (last digit of calendar year) Year code (last 2 digits of calendar year) Week code (week of January 1 is week `01') Alphanumeric traceability code Pb-free JEDEC designator for Matte Tin (Sn) This package is Pb-free. The Pb-free JEDEC designator ( e3 ) can be found on the outer packaging for this package.
Note:
In the event the full Microchip part number cannot be marked on one line, it will be carried over to the next line, thus limiting the number of available characters for customer-specific information.
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27.2 Package Details
The following sections give the technical details of the packages.
64-Lead Plastic Thin Quad Flatpack (PT) 10x10x1 mm Body, 1.0/0.10 mm Lead Form (TQFP)
E E1 #leads=n1 p
D1
D
2 1
B n CH x 45 A c
L
A2 A1 (F)
Number of Pins Pitch Pins per Side n1 Overall Height A .039 .047 Molded Package Thickness A2 .037 .041 Standoff A1 .002 .010 Foot Length L .018 .030 (F) Footprint (Reference) Foot Angle 0 7 Overall Width E .463 .482 Overall Length D .463 .482 Molded Package Width E1 .390 .398 Molded Package Length D1 .390 .398 c Lead Thickness .005 .009 Lead Width B .007 .011 Pin 1 Corner Chamfer CH .025 .045 Mold Draft Angle Top 5 15 Mold Draft Angle Bottom 5 15 *Controlling Parameter Notes: Dimensions D1 and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed .010" (0.254mm) per side. JEDEC Equivalent: MS-026
Drawing No. C04-085
Units Dimension Limits n p
MIN
INCHES NOM 64 .020 16 .043 .039 .006 .024 .039 3.5 .472 .472 .394 .394 .007 .009 .035 10 10
MAX
MIN
MILLIMETERS* NOM 64 0.50 16 1.00 1.10 0.95 1.00 0.05 0.15 0.45 0.60 1.00 0 3.5 11.75 12.00 11.75 12.00 9.90 10.00 9.90 10.00 0.13 0.18 0.17 0.22 0.64 0.89 5 10 5 10
MAX
1.20 1.05 0.25 0.75 7 12.25 12.25 10.10 10.10 0.23 0.27 1.14 15 15
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80-Lead Plastic Thin Quad Flatpack (PT) 12x12x1 mm Body, 1.0/0.10 mm Lead Form (TQFP)
E E1 #leads=n1 p
D1
D
B
2 1
n
CH x 45 A
c
L A1 (F) Units Dimension Limits n p INCHES NOM 80 .020 20 .043 .039 .004 .024 .039 3.5 .551 .551 .472 .472 .006 .009 .035 10 10 MILLIMETERS* NOM 80 0.50 20 1.00 1.10 0.95 1.00 0.05 0.10 0.45 0.60 1.00 0 3.5 13.75 14.00 13.75 14.00 11.75 12.00 11.75 12.00 0.09 0.15 0.17 0.22 0.64 0.89 5 10 5 10
A2
MIN
MAX
MIN
MAX
Number of Pins Pitch Pins per Side n1 Overall Height A .047 .039 Molded Package Thickness A2 .037 .041 Standoff A1 .002 .006 Foot Length L .018 .030 (F) Footprint (Reference) Foot Angle 0 7 Overall Width E .541 .561 Overall Length D .541 .561 Molded Package Width E1 .463 .482 Molded Package Length D1 .463 .482 c Lead Thickness .004 .008 Lead Width B .007 .011 Pin 1 Corner Chamfer CH .025 .045 Mold Draft Angle Top 5 15 Mold Draft Angle Bottom 5 15 *Controlling Parameter Notes: Dimensions D1 and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed .010" (0.254mm) per side. JEDEC Equivalent: MS-026
Drawing No. C04-092
1.20 1.05 0.15 0.75 7 14.25 14.25 12.25 12.25 0.20 0.27 1.14 15 15
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NOTES:
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APPENDIX A: MIGRATION BETWEEN HIGH-END DEVICE FAMILIES
Devices in the PIC18F87J10 and PIC18F8722 families are very similar in their functions and feature sets. However, there are some potentially important differences which should be considered when migrating an application across device families to achieve a new design goal. These are summarized in Table A-1. The areas of difference which could be a major impact on migration are discussed in greater detail later in this section.
TABLE A-1:
NOTABLE DIFFERENCES BETWEEN PIC18F8722 AND PIC18F87J10 FAMILIES
PIC18F87J10 Family 40 MHz @ 2.15V 2.0V-3.6V, dual voltage requirement Low 1,000 write/erase cycles (typical) PORTB and PORTC only 5.5V on digital only pins 66 (RA7, RA6, RE3 and RF0 not available) PORTB, PORTD, PORTE and PORTJ Limited options (EC, HS, PLL, fixed 32 kHz INTRC) 10 years (minimum) Not available 156 s/byte (10 ms/64-byte block) Low Voltage, Key Sequence Single block, all or nothing Stored in last 4 words of Program Memory space 200 s (typical) Always on Not available Simple BOR with Voltage Regulator Not available 15 Required Not available Address shifting available Not available PIC18F8722 Family 40 MHz @ 4.2V 2.0V-5.5V Lower 100,000 write/erase cycles (typical) All ports VDD on all I/O pins 70 PORTB More options (EC, HS, XT, LP, RC, PLL, flexible INTRC) 40 years (minimum) Available 15.6 s/byte (1 ms/64-byte block) VPP and LVP Multiple code protection blocks Stored in Configuration Space, starting at 300000h 10 s (typical) Configurable Available Programmable BOR Available 16 Not required Available Address shifting not available Available
Characteristic Operating Frequency Supply Voltage Operating Current Program Memory Endurance I/O Sink/Source at 25 mA Input Voltage Tolerance on I/O pins I/O Pull-ups Oscillator Options Program Memory Retention Self-Writes to Program Memory Programming Time (Normalized) Programming Entry Code Protection Configuration Words Start-up Time from Sleep Power-up Timer Data EEPROM BOR LVD A/D Channels A/D Calibration Microprocessor mode (EMB) External Memory Addressing In-Circuit Emulation
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A.1 Power Requirement Differences A.3 Oscillator Differences
The most significant difference between the PIC18F87J10 and PIC18F8722 device families is the power requirements. PIC18F87J10 devices are designed on a smaller process; this results in lower maximum voltage and higher leakage current. The operating voltage range for PIC18F87J10 devices is 2.0V to 3.6V. In addition, these devices have split power requirements: one for the core logic and one for the I/O. One of the VDD pins is separated for the core logic supply (VDDCORE). This pin has specific voltage and capacitor requirements as described in Section 26.0 "Electrical Characteristics". The current specifications for PIC18F87J10 devices are yet to be determined. PIC18F8722 devices have a greater range of oscillator options than PIC18F87J10 devices. The latter family is limited primarily to operating modes that support HS and EC oscillators. In addition, the PIC18F87J10 has an internal RC oscillator with only a fixed 32 kHz output. The higher frequency RC modes of the PIC18F8722 family are not available. Both device families have an internal PLL. For the PIC18F87J10 family, however, the PLL must be enabled in software. The clocking differences should be considered when making a conversion between the PIC18F8722 and PIC18F87J10 device families.
A.2
Pin Differences
A.4
Peripherals
There are several differences in the pinouts between the PIC18F87J10 and the PIC18F8722 families: * Input voltage tolerance * Output current capabilities * Available I/O Pins on the PIC18F87J10 that have digital only input capability will tolerate voltages up to 5.5V and are thus tolerant to voltages above VDD. Table 10-1 in Section 10.0 "I/O Ports" contains the complete list. In addition to input differences, there are output differences as well. PIC18F87J10 devices have three classes of pin output current capability: high, medium and low. Not all I/O pins can source or sink equal levels of current. Only PORTB and PORTC support the 25 mA source/sink capability that is supported by all output pins on the PIC18F8722. Table 10-2 in Section 10.0 "I/O Ports" contains the complete list of output capabilities. There are additional differences in how some pin functions are implemented on PIC18F87J10 devices. First, the OSC1/OSC2 oscillator pins are strictly dedicated to the external oscillator function; there is no option to re-allocate these pins to I/O (RA6 or RA7) as on PIC18F8722 devices. Second, the MCLR pin is dedicated only to MCLR and cannot be configured as an input (RG5). Finally, RF0 does not exist on PIC18F87J10 devices. All of these pin differences (including power pin differences) should be accounted for when making a conversion between PIC18F8722 and PIC18F87J10 devices.
Peripherals must also be considered when making a conversion between the PIC18F87J10 and the PIC18F8722 families: * External Memory Bus: The external memory bus on the PIC18F87J10 does not support Microcontroller mode; however, it does support external address offset. * A/D Converter: There are only 15 channels on PIC18F87J10 devices. The converters for these devices also require a calibration step prior to normal operation. * Data EEPROM: PIC18F87J10 devices do not have this module. * BOR: PIC18F87J10 devices do not have a programmable BOR. Simple brown-out capability is provided through the use of the internal voltage regulator. * LVD: PIC18F87J10 devices do not have this module.
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INDEX
A
A/D ................................................................................... 247 A/D Converter Interrupt, Configuring ....................... 251 Acquisition Requirements ........................................ 252 ADCAL Bit ................................................................ 255 ADCON0 Register .................................................... 247 ADCON1 Register .................................................... 247 ADCON2 Register .................................................... 247 ADRESH Register ............................................ 247, 250 ADRESL Register .................................................... 247 Analog Port Pins ...................................................... 138 Analog Port Pins, Configuring .................................. 253 Associated Registers ............................................... 255 Automatic Acquisition Time ...................................... 253 Calculating the Minimum Required Acquisition Time .............................................. 252 Calibration ................................................................ 255 Configuring the Module ............................................ 251 Conversion Clock (TAD) ........................................... 253 Conversion Status (GO/DONE Bit) .......................... 250 Conversions ............................................................. 254 Converter Characteristics ........................................ 368 Operation in Power-Managed Modes ...................... 255 Special Event Trigger (ECCP) ......................... 170, 254 Use of the ECCP2 Trigger ....................................... 254 Absolute Maximum Ratings ............................................. 335 AC (Timing) Characteristics ............................................. 349 Load Conditions for Device Timing Specifications ................................................... 350 Parameter Symbology ............................................. 349 Temperature and Voltage Specifications ................................................... 350 Timing Conditions .................................................... 350 Access Bank ...................................................................... 67 Mapping with Indexed Literal Offset Mode ....................................................... 79 ACKSTAT ........................................................................ 214 ACKSTAT Status Flag ..................................................... 214 ADCAL Bit ........................................................................ 255 ADCON0 Register ............................................................ 247 GO/DONE Bit ........................................................... 250 ADCON1 Register ............................................................ 247 ADCON2 Register ............................................................ 247 ADDFSR .......................................................................... 322 ADDLW ............................................................................ 285 ADDULNK ........................................................................ 322 ADDWF ............................................................................ 285 ADDWFC ......................................................................... 286 ADRESH Register ............................................................ 247 ADRESL Register .................................................... 247, 250 Analog-to-Digital Converter. See A/D. ANDLW ............................................................................ 286 ANDWF ............................................................................ 287 Assembler MPASM Assembler .................................................. 329 Auto-Wake-up on Sync Break Character ......................... 238
B
Bank Select Register (BSR) .............................................. 64 Baud Rate Generator ...................................................... 210 BC .................................................................................... 287 BCF ................................................................................. 288 BF .................................................................................... 214 BF Status Flag ................................................................. 214 Block Diagrams 16-Bit Byte Select Mode ............................................ 91 16-Bit Byte Write Mode .............................................. 89 16-Bit Word Write Mode ............................................ 90 A/D ........................................................................... 250 Analog Input Model .................................................. 251 Baud Rate Generator .............................................. 210 Capture Mode Operation ......................................... 161 Comparator Analog Input Model .............................. 261 Comparator I/O Operating Modes ........................... 258 Comparator Output .................................................. 260 Comparator Voltage Reference ............................... 264 Comparator Voltage Reference Output Buffer Example ................................................ 265 Compare Mode Operation ....................................... 162 Connections for On-Chip Voltage Regulator ........... 274 Device Clock .............................................................. 30 Enhanced PWM ....................................................... 171 EUSART Receive .................................................... 237 EUSART Transmit ................................................... 235 External Power-on Reset Circuit (Slow VDD Power-up) ........................................ 45 Fail-Safe Clock Monitor ........................................... 276 Generic I/O Port Operation ...................................... 115 Interrupt Logic .......................................................... 100 MSSP (I2C Master Mode) ........................................ 208 MSSP (I2C Mode) .................................................... 193 MSSP (SPI Mode) ................................................... 183 On-Chip Reset Circuit ................................................ 43 PIC18F6XJ10/6XJ15 ................................................... 8 PIC18F8XJ10/8XJ15 ................................................... 9 PLL ............................................................................ 29 PORTD and PORTE (Parallel Slave Port) ......................................... 138 PWM Operation (Simplified) .................................... 164 Reads from Program Memory ................................... 82 Single Comparator ................................................... 259 Table Read and Table Write Operations ................... 81 Timer0 in 16-Bit Mode ............................................. 142 Timer0 in 8-Bit Mode ............................................... 142 Timer1 ..................................................................... 146 Timer1 (16-Bit Read/Write Mode) ............................ 146 Timer2 ..................................................................... 152 Timer3 ..................................................................... 154 Timer3 (16-Bit Read/Write Mode) ............................ 154 Timer4 ..................................................................... 158 Watchdog Timer ...................................................... 273 BN .................................................................................... 288 BNC ................................................................................. 289 BNN ................................................................................. 289 BNOV .............................................................................. 290 BNZ ................................................................................. 290 BOR. See Brown-out Reset.
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BOV .................................................................................. 293 BRA .................................................................................. 291 Break Character (12-Bit) Transmit and Receive ............................................................. 240 BRG. See Baud Rate Generator. Brown-out Reset (BOR) ..................................................... 45 and On-Chip Voltage Regulator ............................... 274 Disabling in Sleep Mode ............................................ 45 BSF .................................................................................. 291 BSR .................................................................................... 79 BTFSC ............................................................................. 292 BTFSS .............................................................................. 292 BTG .................................................................................. 293 BZ ..................................................................................... 294 Loading the SSP1BUF (SSP1SR) Register .......................................... 186 Reading a Flash Program Memory Word .................. 83 Saving STATUS, WREG and BSR Registers in RAM .................................... 114 Code Protection ............................................................... 267 COMF .............................................................................. 296 Comparator ...................................................................... 257 Analog Input Connection Considerations ................ 261 Associated Registers ............................................... 261 Configuration ........................................................... 258 Effects of a Reset .................................................... 260 Interrupts ................................................................. 260 Operation ................................................................. 259 Operation During Sleep ........................................... 260 Outputs .................................................................... 259 Reference ................................................................ 259 External Signal ................................................ 259 Internal Signal .................................................. 259 Response Time ........................................................ 259 Comparator Specifications ............................................... 348 Comparator Voltage Reference ....................................... 263 Accuracy and Error .................................................. 264 Associated Registers ............................................... 265 Configuring .............................................................. 263 Connection Considerations ...................................... 264 Effects of a Reset .................................................... 264 Operation During Sleep ........................................... 264 Compare (CCP Module) .................................................. 162 Associated Registers ............................................... 163 CCPRx Register ...................................................... 162 Pin Configuration ..................................................... 162 Software Interrupt .................................................... 162 Timer1/Timer3 Mode Selection ................................ 162 Compare (ECCP Module) ................................................ 170 Special Event Trigger .............................. 155, 170, 254 Computed GOTO ............................................................... 61 Configuration Bits ............................................................ 267 Configuration Register Protection .................................... 278 Context Saving During Interrupts ..................................... 114 CPFSEQ .......................................................................... 296 CPFSGT .......................................................................... 297 CPFSLT ........................................................................... 297 Crystal Oscillator/Ceramic Resonator ................................ 27 Customer Change Notification Service ............................ 387 Customer Notification Service ......................................... 387 Customer Support ............................................................ 387
C
C Compilers MPLAB C17 ............................................................. 330 MPLAB C18 ............................................................. 330 MPLAB C30 ............................................................. 330 Calibration (A/D Converter) .............................................. 255 CALL ................................................................................ 294 CALLW ............................................................................. 323 Capture (CCP Module) ..................................................... 161 Associated Registers ............................................... 163 CCP Pin Configuration ............................................. 161 CCPRxH:CCPRxL Registers ................................... 161 Prescaler .................................................................. 161 Software Interrupt .................................................... 161 Timer1/Timer3 Mode Selection ................................ 161 Capture (ECCP Module) .................................................. 170 Capture/Compare/PWM (CCP) ........................................ 159 Capture Mode. See Capture. CCP Mode and Timer Resources ............................ 160 CCPRxH Register .................................................... 160 CCPRxL Register ..................................................... 160 Compare Mode. See Compare. Interconnect Configurations ..................................... 160 Module Configuration ............................................... 160 Clock Sources .................................................................... 30 Default System Clock on Reset ................................. 31 Selection Using OSCCON Register ........................... 31 Clocking Scheme/Instruction Cycle .................................... 62 CLRF ................................................................................ 295 CLRWDT .......................................................................... 295 Code Examples 16 x 16 Signed Multiply Routine ................................ 98 16 x 16 Unsigned Multiply Routine ............................ 98 8 x 8 Signed Multiply Routine .................................... 97 8 x 8 Unsigned Multiply Routine ................................ 97 Changing Between Capture Prescalers ................... 161 Computed GOTO Using an Offset Value ................... 61 Fast Register Stack .................................................... 61 How to Clear RAM (Bank 1) Using Indirect Addressing ............................................ 74 Implementing a Real-Time Clock Using a Timer1 Interrupt Service ..................... 149 Initializing PORTA .................................................... 116 Initializing PORTB .................................................... 118 Initializing PORTC .................................................... 121 Initializing PORTD .................................................... 124 Initializing PORTE .................................................... 127 Initializing PORTF .................................................... 130 Initializing PORTG ................................................... 132 Initializing PORTH .................................................... 134 Initializing PORTJ .................................................... 136
D
Data Addressing Modes .................................................... 74 Comparing Addressing Modes with the Extended Instruction Set Enabled ..................... 78 Direct ......................................................................... 74 Indexed Literal Offset ................................................ 77 Indirect ....................................................................... 74 Inherent and Literal .................................................... 74 Data Memory ..................................................................... 64 Access Bank .............................................................. 67 and the Extended Instruction Set .............................. 77 Bank Select Register (BSR) ...................................... 64 General Purpose Registers ....................................... 67 Map for PIC18FX5J10/X5J15/X6J10 Devices ........... 65 Map for PIC18FX6J15/X7J10 Devices ...................... 66 Special Function Registers ........................................ 68 DAW ................................................................................ 298
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DC Characteristics ........................................................... 345 Power-Down and Supply Current ............................ 338 Supply Voltage ......................................................... 337 DCFSNZ .......................................................................... 299 DECF ............................................................................... 298 DECFSZ ........................................................................... 299 Default System Clock ......................................................... 31 Demonstration Boards PICDEM 1 ................................................................ 332 PICDEM 17 .............................................................. 333 PICDEM 18R ........................................................... 333 PICDEM 2 Plus ........................................................ 332 PICDEM 3 ................................................................ 332 PICDEM 4 ................................................................ 332 PICDEM LIN ............................................................ 333 PICDEM USB ........................................................... 333 PICDEM.net Internet/Ethernet ................................. 332 Development Support ...................................................... 329 Device Overview .................................................................. 5 Details on Individual Family Members ......................... 6 Features (64-Pin Devices) ........................................... 7 Features (80-Pin Devices) ........................................... 7 Direct Addressing ............................................................... 75 Baud Rate Generator (BRG) ................................... 229 Associated Registers ....................................... 230 Auto-Baud Rate Detect .................................... 233 Baud Rate Error, Calculating ........................... 230 Baud Rates, Asynchronous Modes ................. 231 High Baud Rate Select (BRGH Bit) ................. 229 Sampling ......................................................... 229 Synchronous Master Mode ...................................... 241 Associated Registers, Receive ........................ 244 Associated Registers, Transmit ....................... 242 Reception ........................................................ 243 Transmission ................................................... 241 Synchronous Slave Mode ........................................ 244 Associated Registers, Receive ........................ 246 Associated Registers, Transmit ....................... 245 Reception ........................................................ 245 Transmission ................................................... 244 Evaluation and Programming Tools ................................. 333 Extended Instruction Set ADDFSR .................................................................. 322 ADDULNK ............................................................... 322 CALLW .................................................................... 323 MOVSF .................................................................... 323 MOVSS .................................................................... 324 PUSHL ..................................................................... 324 SUBFSR .................................................................. 325 SUBULNK ................................................................ 325 Extended Microcontroller Mode ......................................... 88 External Clock Input (EC Modes) ...................................... 28 External Memory Bus ........................................................ 85 16-Bit Byte Select Mode ............................................ 91 16-Bit Byte Write Mode .............................................. 89 16-Bit Data Width Modes ........................................... 88 16-Bit Mode Timing ................................................... 92 16-Bit Word Write Mode ............................................ 90 8-Bit Mode ................................................................. 93 8-Bit Mode Timing ..................................................... 94 Address and Data Line Usage (table) ....................... 87 Address and Data Width ............................................ 87 Address Shifting ........................................................ 87 and Program Memory Modes ............................ 88 Control ....................................................................... 86 I/O Port Functions ...................................................... 85 Operation in Power-Managed Modes ........................ 95 Wait States ................................................................ 88 Weak Pull-ups on Port Pins ....................................... 88
E
ECCP Capture and Compare Modes .................................. 170 Standard PWM Mode ............................................... 170 Effect on Standard PIC Instructions ........................... 77, 326 Effects of Power-Managed Modes on Various Clock Sources ............................................... 32 Electrical Characteristics .................................................. 335 Enhanced Capture/Compare/PWM (ECCP) .................... 167 Capture Mode. See Capture (ECCP Module). ECCP1/ECCP3 Outputs and Program Memory Mode ................................... 168 ECCP2 Outputs and Program Memory Modes ................................................ 168 Outputs and Configuration ....................................... 168 Pin Configurations for ECCP1 ................................. 169 Pin Configurations for ECCP2 ................................. 169 Pin Configurations for ECCP3 ................................. 170 PWM Mode. See PWM (ECCP Module). Timer Resources ...................................................... 168 Enhanced PWM Mode ..................................................... 171 Enhanced Universal Synchronous Asynchronous Receiver Transmitter (EUSART). See EUSART. ENVREG Pin .................................................................... 274 Equations A/D Acquisition Time ................................................ 252 A/D Minimum Charging Time ................................... 252 Errata ................................................................................... 4 EUSART Asynchronous Mode ................................................ 235 12-bit Break Transmit and Receive ................. 240 Associated Registers, Receive ........................ 238 Associated Registers, Transmit ....................... 236 Auto-Wake-up on Sync Break ......................... 238 Receiver ........................................................... 237 Setting up 9-Bit Mode with Address Detect ........................................ 237 Transmitter ....................................................... 235 Baud Rate Generator Operation in Power-Managed Mode ................ 229
F
Fail-Safe Clock Monitor ........................................... 267, 276 Interrupts in Power-Managed Modes ...................... 277 POR or Wake-up from Sleep ................................... 277 WDT During Oscillator Failure ................................. 276 Fast Register Stack ........................................................... 61 Firmware Instructions ...................................................... 279 Flash Configuration Words ........................................ 56, 267 Flash Program Memory Associated Registers ................................................. 84 Operation During Code-Protect ................................. 84 Reading ..................................................................... 82 FSCM. See Fail-Safe Clock Monitor.
G
GOTO .............................................................................. 300
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H
Hardware Multiplier ............................................................ 97 Introduction ................................................................ 97 Operation ................................................................... 97 Performance Comparison .......................................... 97 ANDWF .................................................................... 287 BC ............................................................................ 287 BCF ......................................................................... 288 BN ............................................................................ 288 BNC ......................................................................... 289 BNN ......................................................................... 289 BNOV ...................................................................... 290 BNZ ......................................................................... 290 BOV ......................................................................... 293 BRA ......................................................................... 291 BSF .......................................................................... 291 BSF (Indexed Literal Offset Mode) .......................... 327 BTFSC ..................................................................... 292 BTFSS ..................................................................... 292 BTG ......................................................................... 293 BZ ............................................................................ 294 CALL ........................................................................ 294 CLRF ....................................................................... 295 CLRWDT ................................................................. 295 COMF ...................................................................... 296 CPFSEQ .................................................................. 296 CPFSGT .................................................................. 297 CPFSLT ................................................................... 297 DAW ........................................................................ 298 DCFSNZ .................................................................. 299 DECF ....................................................................... 298 DECFSZ .................................................................. 299 Extended Instructions .............................................. 321 Considerations when Enabling ........................ 326 Syntax .............................................................. 321 Use with MPLAB IDE Tools ............................. 328 General Format ........................................................ 281 GOTO ...................................................................... 300 INCF ........................................................................ 300 INCFSZ .................................................................... 301 INFSNZ .................................................................... 301 IORLW ..................................................................... 302 IORWF ..................................................................... 302 LFSR ....................................................................... 303 MOVF ...................................................................... 303 MOVFF .................................................................... 304 MOVLB .................................................................... 304 MOVLW ................................................................... 305 MOVWF ................................................................... 305 MULLW .................................................................... 306 MULWF .................................................................... 306 NEGF ....................................................................... 307 NOP ......................................................................... 307 POP ......................................................................... 308 PUSH ....................................................................... 308 RCALL ..................................................................... 309 RESET ..................................................................... 309 RETFIE .................................................................... 310 RETLW .................................................................... 310 RETURN .................................................................. 311 RLCF ....................................................................... 311 RLNCF ..................................................................... 312 RRCF ....................................................................... 312 RRNCF .................................................................... 313 SETF ....................................................................... 313 SETF (Indexed Literal Offset Mode) ........................ 327 SLEEP ..................................................................... 314 Standard Instructions ............................................... 279 SUBFWB ................................................................. 314 SUBLW .................................................................... 315
I
I/O Ports ........................................................................... 115 I2C Mode (MSSP) Acknowledge Sequence Timing ............................... 217 Associated Registers ............................................... 223 Baud Rate Generator ............................................... 210 Bus Collision During a Repeated Start Condition .................. 221 During a Stop Condition ................................... 222 Clock Arbitration ....................................................... 211 Clock Stretching ....................................................... 203 10-Bit Slave Receive Mode (SEN = 1) ................................................. 203 10-Bit Slave Transmit Mode ............................. 203 7-Bit Slave Receive Mode (SEN = 1) ................................................. 203 7-Bit Slave Transmit Mode ............................... 203 Clock Synchronization and the CKP Bit ................... 204 Effects of a Reset ..................................................... 218 General Call Address Support ................................. 207 I2C Clock Rate w/BRG ............................................. 210 Master Mode ............................................................ 208 Baud Rate Generator ....................................... 210 Operation ......................................................... 209 Reception ......................................................... 214 Repeated Start Condition Timing ..................... 213 Start Condition Timing ..................................... 212 Transmission .................................................... 214 Multi-Master Communication, Bus Collision and Arbitration .................................................. 218 Multi-Master Mode ................................................... 218 Operation ................................................................. 197 Read/Write Bit Information (R/W Bit) ............... 197, 198 Registers .................................................................. 193 Serial Clock (SCKx/SCLx) ....................................... 198 Slave Mode .............................................................. 197 Addressing ....................................................... 197 Reception ......................................................... 198 Transmission .................................................... 198 Sleep Operation ....................................................... 218 Stop Condition Timing .............................................. 217 INCF ................................................................................. 300 INCFSZ ............................................................................ 301 In-Circuit Debugger .......................................................... 278 In-Circuit Serial Programming (ICSP) ...................... 267, 278 Indexed Literal Offset Addressing and Standard PIC18 Instructions ............................. 326 Indexed Literal Offset Mode ................................. 77, 79, 326 Indirect Addressing ............................................................ 75 INFSNZ ............................................................................ 301 Initialization Conditions for all Registers ...................... 49-53 Instruction Cycle ................................................................. 62 Instruction Flow/Pipelining ................................................. 62 Instruction Set .................................................................. 279 ADDLW .................................................................... 285 ADDWF .................................................................... 285 ADDWF (Indexed Literal Offset Mode) .................... 327 ADDWFC ................................................................. 286 ANDLW .................................................................... 286
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SUBWF .................................................................... 315 SUBWFB .................................................................. 316 SWAPF .................................................................... 316 TBLRD ..................................................................... 317 TBLWT ..................................................................... 318 TSTFSZ ................................................................... 319 XORLW .................................................................... 319 XORWF .................................................................... 320 INTCON Register RBIF Bit .................................................................... 118 INTCON Registers ........................................................... 101 Inter-Integrated Circuit. See I2C Mode. Internal Oscillator Block ..................................................... 30 Internal RC Oscillator Use with WDT .......................................................... 273 Internet Address ............................................................... 387 Interrupt Sources ............................................................. 267 A/D Conversion Complete ....................................... 251 Capture Complete (CCP) ......................................... 161 Compare Complete (CCP) ....................................... 162 Interrupt-on-Change (RB7:RB4) .............................. 118 INTn Pin ................................................................... 114 PORTB, Interrupt-on-Change .................................. 114 TMR0 ....................................................................... 114 TMR0 Overflow ........................................................ 143 TMR1 Overflow ........................................................ 145 TMR2 to PR2 Match (PWM) ............................ 164, 171 TMR3 Overflow ................................................ 153, 155 TMR4 to PR4 Match ................................................ 158 TMR4 to PR4 Match (PWM) .................................... 157 Interrupts ............................................................................ 99 Interrupts, Flag Bits Interrupt-on-Change (RB7:RB4) Flag (RBIF Bit) ................................................. 118 INTOSC, INTRC. See Internal Oscillator Block. IORLW ............................................................................. 302 IORWF ............................................................................. 302 IPR Registers ................................................................... 110 MOVSF ............................................................................ 323 MOVSS ............................................................................ 324 MOVWF ........................................................................... 305 MPLAB ASM30 Assembler, Linker, Librarian ....................................................... 330 MPLAB ICD 2 In-Circuit Debugger .................................. 331 MPLAB ICE 2000 High-Performance Universal In-Circuit Emulator ................................... 331 MPLAB ICE 4000 High-Performance Universal In-Circuit Emulator ................................... 331 MPLAB Integrated Development Environment Software ............................................. 329 MPLAB PM3 Device Programmer ................................... 331 MPLINK Object Linker/MPLIB Object Librarian ............... 330 MSSP ACK Pulse ....................................................... 197, 198 Control Registers (general) ..................................... 183 Module Overview ..................................................... 183 SPI Master/Slave Connection .................................. 187 SSPxBUF Register .................................................. 188 SSPxSR Register .................................................... 188 MULLW ............................................................................ 306 MULWF ............................................................................ 306
N
NEGF ............................................................................... 307 NOP ................................................................................. 307 Notable Differences Between PIC18F8722 and PIC18F87J10 Families ..................................... 375 Oscillator Options .................................................... 376 Peripherals .............................................................. 376 Pinouts ..................................................................... 376 Power Requirements ............................................... 376
O
Opcode Field Descriptions ............................................... 280 Oscillator Configuration ..................................................... 27 EC .............................................................................. 27 ECPLL ....................................................................... 27 HS .............................................................................. 27 HS Modes .................................................................. 27 HSPLL ....................................................................... 27 Internal Oscillator Block ............................................. 30 INTRC ........................................................................ 27 Oscillator Selection .......................................................... 267 Oscillator Start-up Timer (OST) ......................................... 33 Oscillator Switching ........................................................... 30 Oscillator Transitions ......................................................... 31 Oscillator, Timer1 ..................................................... 145, 155 Oscillator, Timer3 ............................................................. 153
K
Key Features Easy Migration ............................................................. 6 Expanded Memory ....................................................... 5 Extended Instruction Set .............................................. 5 External Memory Bus ................................................... 5
L
LFSR ................................................................................ 303
M
Master Clear (MCLR) ......................................................... 45 Master Synchronous Serial Port (MSSP). See MSSP. Memory Maps Data Memory PIC18FX5J10/X5J15/X6J10 .............................. 65 PIC18FX6J15/X7J10 ......................................... 66 Memory Organization ......................................................... 55 Data Memory ............................................................. 64 Program Memory ....................................................... 55 Memory Programming Requirements .............................. 347 Microchip Internet Web Site ............................................. 387 Microcontroller Mode ......................................................... 88 MOVF ............................................................................... 303 MOVFF ............................................................................ 304 MOVLB ............................................................................ 304 MOVLW ........................................................................... 305
P
Packaging ........................................................................ 371 Details ...................................................................... 372 Marking .................................................................... 371 Parallel Slave Port (PSP) ................................................. 138 Associated Registers ............................................... 140 RE0/RD Pin ............................................................. 138 RE1/WR Pin ............................................................ 138 RE2/CS Pin ............................................................. 138 Select (PSPMODE Bit) ............................................ 138 PICkit 1 Flash Starter Kit ................................................. 333 PICSTART Plus Development Programmer ............................................................. 332 PIE Registers ................................................................... 107
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Pin Functions AVDD .......................................................................... 25 AVDD .......................................................................... 16 AVSS .......................................................................... 25 AVSS .......................................................................... 16 ENVREG .............................................................. 16, 25 MCLR ................................................................... 10, 17 OSC1/CLKI .......................................................... 10, 17 OSC2/CLKO ........................................................ 10, 17 RA0/AN0 .............................................................. 10, 17 RA1/AN1 .............................................................. 10, 17 RA2/AN2/VREF- .................................................... 10, 17 RA3/AN3/VREF+ ................................................... 10, 17 RA4/T0CKI ........................................................... 10, 17 RA5/AN4 .............................................................. 10, 17 RB0/INT0/FLT0 .................................................... 11, 18 RB1/INT1 ............................................................. 11, 18 RB2/INT2 ............................................................. 11, 18 RB3/INT3 ................................................................... 11 RB3/INT3/ECCP2/P2A .............................................. 18 RB4/KBI0 ............................................................. 11, 18 RB5/KBI1 ............................................................. 11, 18 RB6/KBI2/PGC .................................................... 11, 18 RB7/KBI3/PGD .................................................... 11, 18 RC0/T1OSO/T13CKI ........................................... 12, 19 RC1/T1OSI/ECCP2/P2A ...................................... 12, 19 RC2/ECCP1/P1A ................................................. 12, 19 RC3/SCK1/SCL1 ................................................. 12, 19 RC4/SDI1/SDA1 .................................................. 12, 19 RC5/SDO1 ........................................................... 12, 19 RC6/TX1/CK1 ...................................................... 12, 19 RC7/RX1/DT1 ...................................................... 12, 19 RD0/AD0/PSP0 .......................................................... 20 RD0/PSP0 .................................................................. 13 RD1/AD1/PSP1 .......................................................... 20 RD1/PSP1 .................................................................. 13 RD2/AD2/PSP2 .......................................................... 20 RD2/PSP2 .................................................................. 13 RD3/AD3/PSP3 .......................................................... 20 RD3/PSP3 .................................................................. 13 RD4/AD4/PSP4/SDO2 ............................................... 20 RD4/PSP4/SDO2 ....................................................... 13 RD5/AD5/PSP5/SDI2/SDA2 ...................................... 20 RD5/PSP5/SDI2/SDA2 .............................................. 13 RD6/AD6/PSP6/SCK2/SCL2 ..................................... 20 RD6/PSP6/SCK2/SCL2 ............................................. 13 RD7/AD7/PSP7/SS2 .................................................. 20 RD7/PSP7/SS2 .......................................................... 13 RE0/AD8/RD/P2D ...................................................... 21 RE0/RD/P2D .............................................................. 14 RE1/AD9/WR/P2C ..................................................... 21 RE1/WR/P2C ............................................................. 14 RE2/AD10/CS/P2B .................................................... 21 RE2/CS/P2D .............................................................. 14 RE3/AD11/P3C .......................................................... 21 RE3/P3C .................................................................... 14 RE4/AD12/P3B .......................................................... 21 RE4/P3B .................................................................... 14 RE5/AD13/P1C .......................................................... 21 RE5/P1C .................................................................... 14 RE6/AD14/P1B .......................................................... 21 RE6/P1B .................................................................... 14 RE7/AD15/ECCP2/P2A ............................................. 21 RE7/ECCP2/P2A ....................................................... 14 RF1/AN6/C2OUT ................................................. 15, 22 RF2/AN7/C1OUT ................................................. 15, 22 RF3/AN8 .............................................................. 15, 22 RF4/AN9 .............................................................. 15, 22 RF5/AN10/CVREF ................................................ 15, 22 RF6/AN11 ............................................................ 15, 22 RF7/SS1 .............................................................. 15, 22 RG0/ECCP3/P3A ................................................. 16, 23 RG1/TX2/CK2 ...................................................... 16, 23 RG2/RX2/DT2 ...................................................... 16, 23 RG3/CCP4/P3D ................................................... 16, 23 RG4/CCP5/P1D ................................................... 16, 23 RH0/A16 .................................................................... 24 RH1/A17 .................................................................... 24 RH2/A18 .................................................................... 24 RH3/A19 .................................................................... 24 RH4/AN12/P3C .......................................................... 24 RH5/AN13/P3B .......................................................... 24 RH6/AN14/P1C .......................................................... 24 RH7/AN15/P1B .......................................................... 24 RJ0/ALE .................................................................... 25 RJ1/OE ...................................................................... 25 RJ2/WRL ................................................................... 25 RJ3/WRH ................................................................... 25 RJ4/BA0 .................................................................... 25 RJ5/CE ...................................................................... 25 RJ6/LB ....................................................................... 25 RJ7/UB ...................................................................... 25 VDD ............................................................................ 25 VDD ............................................................................ 16 VDDCORE/VCAP ..................................................... 16, 25 VSS ............................................................................ 25 VSS ............................................................................ 16 Pinout I/O Descriptions PIC18F6XJ10/6XJ15 ................................................. 10 PIC18F8XJ10/8XJ15 ................................................. 17 PIR Registers ................................................................... 104 PLL .................................................................................... 29 ECPLL Oscillator Mode ............................................. 29 HSPLL Oscillator Mode ............................................. 29 POP ................................................................................. 308 POR. See Power-on Reset. PORTA Associated Registers ............................................... 117 LATA Register ......................................................... 116 PORTA Register ...................................................... 116 TRISA Register ........................................................ 116 PORTB Associated Registers ............................................... 120 LATB Register ......................................................... 118 PORTB Register ...................................................... 118 RB7:RB4 Interrupt-on-Change Flag (RBIF Bit) ......................................................... 118 TRISB Register ........................................................ 118 PORTC Associated Registers ............................................... 123 LATC Register ......................................................... 121 PORTC Register ...................................................... 121 RC3/SCK1/SCL1 Pin ............................................... 198 TRISC Register ........................................................ 121 PORTD ............................................................................ 138 Associated Registers ............................................... 126 LATD Register ......................................................... 124 PORTD Register ...................................................... 124 TRISD Register ........................................................ 124
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PORTE Analog Port Pins ...................................................... 138 Associated Registers ............................................... 129 LATE Register .......................................................... 127 PORTE Register ...................................................... 127 PSP Mode Select (PSPMODE Bit) .......................... 138 RE0/RD Pin .............................................................. 138 RE1/WR Pin ............................................................. 138 RE2/CS Pin .............................................................. 138 TRISE Register ........................................................ 127 PORTF Associated Registers ............................................... 131 LATF Register .......................................................... 130 PORTF Register ...................................................... 130 TRISF Register ........................................................ 130 PORTG Associated Registers ............................................... 133 LATG Register ......................................................... 132 PORTG Register ...................................................... 132 TRISG Register ........................................................ 132 PORTH Associated Registers ............................................... 135 LATH Register ......................................................... 134 PORTH Register ...................................................... 134 TRISH Register ........................................................ 134 PORTJ Associated Registers ............................................... 137 LATJ Register .......................................................... 136 PORTJ Register ....................................................... 136 TRISJ Register ......................................................... 136 Power-Managed Modes ..................................................... 35 and EUSART Operation ........................................... 229 and Multiple Sleep Commands .................................. 36 and SPI Operation ................................................... 191 Clock Transitions and Status Indicators ................................................ 36 Entering ...................................................................... 35 Exiting Idle and Sleep Modes .................................... 41 by Reset ............................................................. 41 by WDT Time-out ............................................... 41 Without an Oscillator Start-up Delay ............................................ 41 Idle Modes ................................................................. 39 PRI_IDLE ........................................................... 40 RC_IDLE ............................................................ 41 SEC_IDLE ......................................................... 40 Run Modes ................................................................. 36 PRI_RUN ........................................................... 36 RC_RUN ............................................................ 38 SEC_RUN .......................................................... 36 Selecting .................................................................... 35 Sleep Mode ................................................................ 39 Summary (table) ........................................................ 35 Power-on Reset (POR) ...................................................... 45 Power-up Timer (PWRT) ........................................... 46 Time-out Sequence .................................................... 46 Power-up Delays ................................................................ 33 Power-up Timer (PWRT) ............................................. 33, 46 Prescaler Timer2 ...................................................................... 172 Prescaler, Timer0 ............................................................. 143 Prescaler, Timer2 ............................................................. 165 PRI_IDLE Mode ................................................................. 40 PRI_RUN Mode ................................................................. 36 PRO MATE II Universal Device Programmer ................................................. 331 Program Counter ............................................................... 59 PCL, PCH and PCU Registers .................................. 59 PCLATH and PCLATU Registers .............................. 59 Program Memory ............................................................... 81 and the Extended Instruction Set .............................. 77 Control Registers ....................................................... 82 TABLAT (Table Latch) Register ........................ 82 TBLPTR (Table Pointer) Register ...................... 82 Erasing External Memory (PIC18F8XJ10/8XJ15) ....................................... 83 Instructions ................................................................ 63 Two-Word .......................................................... 63 Interrupt Vector .......................................................... 56 Look-up Tables .......................................................... 61 Maps Program Memory Modes ................................... 58 Memory Maps ............................................................ 55 Hard Vectors and Configuration Words ............. 56 Modes ........................................................................ 57 Address Shifting (Extended Microcontroller) ........................ 58 Extended Microcontroller ................................... 57 Memory Access (table) ...................................... 58 Microcontroller ................................................... 57 Reset Vector .............................................................. 56 Table Reads and Table Writes .................................. 81 Writing and Erasing (ICSP) ....................................... 84 Writing To Unexpected Termination ................................... 83 Writing to Program Memory Space (PIC18F8XJ10/8XJ15) .............................. 83 Write Verify ........................................................ 83 Program Memory Modes Operation of the External Memory Bus ..................... 88 Program Verification and Code Protection ...................... 278 Programming, Device Instructions ................................... 279 PSP.See Parallel Slave Port. Pulse-Width Modulation. See PWM (CCP Module) and PWM (ECCP Module). PUSH ............................................................................... 308 PUSH and POP Instructions .............................................. 60 PUSHL ............................................................................. 324 PWM (CCP Module) Associated Registers ............................................... 166 Duty Cycle ............................................................... 164 Example Frequencies/Resolutions .......................... 165 Operation Setup ...................................................... 165 Period ...................................................................... 164 TMR2 to PR2 Match ........................................ 164, 171 TMR4 to PR4 Match ................................................ 157 PWM (ECCP Module) ...................................................... 171 Associated Registers ............................................... 182 CCPR1H:CCPR1L Registers .................................. 171 Direction Change in Full-Bridge Output Mode .................................................... 176 Duty Cycle ............................................................... 172 Effects of a Reset .................................................... 181 Enhanced PWM Auto-Shutdown ............................. 178 Example Frequencies/Resolutions .......................... 172 Full-Bridge Application Example .............................. 176 Full-Bridge Mode ..................................................... 175 Half-Bridge Mode ..................................................... 174
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Half-Bridge Output Mode Applications Example ....................................... 174 Output Configurations .............................................. 172 Output Relationships (Active-High) .......................... 173 Output Relationships (Active-Low) ........................... 173 Period ....................................................................... 171 Programmable Dead-Band Delay ............................ 178 Setup for PWM Operation ........................................ 181 Start-up Considerations ........................................... 179 RCSTAx (Receive Status and Control) .................... 227 SSPxCON1 (MSSPx Control 1, I2C Mode) ........................................................ 195 SSPxCON1 (MSSPx Control 1, SPI Mode) ........................................................ 185 SSPxCON2 (MSSPx Control 2, I2C Mode) ........................................................ 196 SSPxSTAT (MSSPx Status, I2C Mode) ........................................................ 194 SSPxSTAT (MSSPx Status, SPI Mode) ........................................................ 184 STATUS .................................................................... 73 STKPTR (Stack Pointer) ............................................ 60 T0CON (Timer0 Control) ......................................... 141 T1CON (Timer1 Control) ......................................... 145 T2CON (Timer2 Control) ......................................... 151 T3CON (Timer3 Control) ......................................... 153 T4CON (Timer 4 Control) ........................................ 157 TXSTAx (Transmit Status and Control) ................... 226 WDTCON (Watchdog Timer Control) ...................... 273 Reset ................................................................................. 43 MCLR Reset, During Power-Managed Modes .................................... 43 MCLR Reset, Normal Operation ................................ 43 Power-on Reset (POR) .............................................. 43 Programmable Brown-out Reset (BOR) .................... 43 Stack Full Reset ......................................................... 43 Stack Underflow Reset .............................................. 43 Watchdog Timer (WDT) Reset .................................. 43 Resets .............................................................................. 267 Brown-out Reset (BOR) ........................................... 267 Oscillator Start-up Timer (OST) ............................... 267 Power-on Reset (POR) ............................................ 267 Power-up Timer (PWRT) ......................................... 267 RETFIE ............................................................................ 310 RETLW ............................................................................ 310 RETURN .......................................................................... 311 Return Address Stack ........................................................ 59 Return Stack Pointer (STKPTR) ........................................ 60 RLCF ............................................................................... 311 RLNCF ............................................................................. 312 RRCF ............................................................................... 312 RRNCF ............................................................................ 313
Q
Q Clock .................................................................... 165, 172
R
RAM. See Data Memory. RC_IDLE Mode .................................................................. 41 RC_RUN Mode .................................................................. 38 RCALL .............................................................................. 309 RCON Register Bit Status During Initialization .................................... 48 Reader Response ............................................................ 388 Register File ....................................................................... 67 Registers ADCON0 (A/D Control 0) ......................................... 247 ADCON1 (A/D Control 1) ......................................... 248 ADCON2 (A/D Control 2) ......................................... 249 BAUDCONx (Baud Rate Control) ............................ 228 CCPxCON (CCP Control, CCP4 and CCP5) ............................................. 159 CCPxCON (Enhanced Capture/Compare/ PWM Control) .................................................. 167 CMCON (Comparator Control) ................................ 257 CONFIG1H (Configuration 1 High) .......................... 269 CONFIG1L (Configuration 1 Low) ............................ 269 CONFIG2H (Configuration 2 High) .......................... 270 CONFIG2L (Configuration 2 Low) ............................ 270 CONFIG3H (Configuration 3 High) .......................... 271 CONFIG3H (Configuration 3 Low) ........................... 271 CONFIG3L (Configuration 3 Low) .............................. 57 CVRCON (Comparator Voltage Reference Control) ........................................... 263 Device ID Register 1 ................................................ 272 Device ID Register 2 ................................................ 272 ECCPxAS (ECCP Auto-Shutdown Control) ............................................................ 179 ECCPxDEL (PWM Configuration) ............................ 178 INTCON (Interrupt Control) ...................................... 101 INTCON2 (Interrupt Control 2) ................................. 102 INTCON3 (Interrupt Control 3) ................................. 103 IPR1 (Peripheral Interrupt Priority 1) ........................ 110 IPR2 (Peripheral Interrupt Priority 2) ........................ 111 IPR3 (Peripheral Interrupt Priority 3) ........................ 112 MEMCON (External Memory Bus Control) ................ 86 OSCCON (Oscillator Control) .................................... 32 OSCTUNE (PLL Control) ........................................... 29 PIE1 (Peripheral Interrupt Enable 1) ........................ 107 PIE2 (Peripheral Interrupt Enable 2) ........................ 108 PIE3 (Peripheral Interrupt Enable 3) ........................ 109 PIR1 (Peripheral Interrupt Request (Flag) 1) ........................................................... 104 PIR2 (Peripheral Interrupt Request (Flag) 2) ........................................................... 105 PIR3 (Peripheral Interrupt Request (Flag) 3) ........................................................... 106 PSPCON (Parallel Slave Port Control) .................... 139 RCON (Reset Control) ....................................... 44, 113
S
SCKx ................................................................................ 183 SDIx ................................................................................. 183 SDOx ............................................................................... 183 SEC_IDLE Mode ............................................................... 40 SEC_RUN Mode ................................................................ 36 Serial Clock, SCKx .......................................................... 183 Serial Data In (SDIx) ........................................................ 183 Serial Data Out (SDOx) ................................................... 183 Serial Peripheral Interface. See SPI Mode. SETF ................................................................................ 313 Slave Select (SSx) ........................................................... 183 SLEEP ............................................................................. 314 Sleep OSC1 and OSC2 Pin States ...................................... 33 Sleep Mode ........................................................................ 39 Software Simulator (MPLAB SIM) ................................... 330 Software Simulator (MPLAB SIM30) ............................... 330 Special Event Trigger. See Compare (ECCP Module). Special Features of the CPU ........................................... 267
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Special Function Registers ................................................ 68 Map ............................................................................ 68 SPI Mode (MSSP) Associated Registers ............................................... 192 Bus Mode Compatibility ........................................... 191 Clock Speed and Module Interactions ..................... 191 Effects of a Reset ..................................................... 191 Enabling SPI I/O ...................................................... 187 Master Mode ............................................................ 188 Master/Slave Connection ......................................... 187 Operation ................................................................. 186 Operation in Power-Managed Modes ...................... 191 Serial Clock .............................................................. 183 Serial Data In ........................................................... 183 Serial Data Out ........................................................ 183 Slave Mode .............................................................. 189 Slave Select ............................................................. 183 Slave Select Synchronization .................................. 189 SPI Clock ................................................................. 188 Typical Connection .................................................. 187 SSP TMR4 Output for Clock Shift .................................... 158 SSPOV ............................................................................. 214 SSPOV Status Flag ......................................................... 214 SSPSTAT Register R/W Bit ..................................................................... 198 SSPxSTAT Register R/W Bit ..................................................................... 197 SSx .................................................................................. 183 Stack Full/Underflow Resets .............................................. 61 SUBFSR .......................................................................... 325 SUBFWB .......................................................................... 314 SUBLW ............................................................................ 315 SUBULNK ........................................................................ 325 SUBWF ............................................................................ 315 SUBWFB .......................................................................... 316 SWAPF ............................................................................ 316 Resetting, Using the CCP Special Event Trigger ...................................... 148 Special Event Trigger (ECCP) ................................. 170 TMR1H Register ...................................................... 145 TMR1L Register ...................................................... 145 Use as a Clock Source ............................................ 147 Use as a Real-Time Clock ....................................... 148 Timer2 ............................................................................. 151 Associated Registers ............................................... 152 Interrupt ................................................................... 152 Operation ................................................................. 151 Output ...................................................................... 152 PR2 Register ................................................... 164, 171 TMR2 to PR2 Match Interrupt .......................... 164, 171 Timer3 ............................................................................. 153 16-Bit Read/Write Mode .......................................... 155 Associated Registers ............................................... 155 Operation ................................................................. 154 Oscillator .......................................................... 153, 155 Overflow Interrupt ............................................ 153, 155 Special Event Trigger (ECCP) ................................. 155 TMR3H Register ...................................................... 153 TMR3L Register ...................................................... 153 Timer4 ............................................................................. 157 Associated Registers ............................................... 158 Operation ................................................................. 157 Postscaler. See Postscaler, Timer4. PR4 Register ........................................................... 157 Prescaler. See Prescaler, Timer4. SSP Clock Shift ....................................................... 158 TMR4 Register ........................................................ 157 TMR4 to PR4 Match Interrupt .......................... 157, 158 Timing Diagrams A/D Conversion ....................................................... 368 Acknowledge Sequence .......................................... 217 Asynchronous Reception ......................................... 238 Asynchronous Transmission ................................... 236 Asynchronous Transmission (Back to Back) ................................................. 236 Automatic Baud Rate Calculation ............................ 234 Auto-Wake-up Bit (WUE) During Normal Operation ............................................ 239 Auto-Wake-up Bit (WUE) During Sleep ................... 239 Baud Rate Generator with Clock Arbitration ............ 211 BRG Overflow Sequence ........................................ 234 BRG Reset Due to SDAx Arbitration During Start Condition ..................................... 220 Brown-out Reset (BOR) ........................................... 356 Bus Collision During a Repeated Start Condition (Case 1) .................................. 221 Bus Collision During a Repeated Start Condition (Case 2) .................................. 221 Bus Collision During a Start Condition (SCLx = 0) ....................................................... 220 Bus Collision During a Stop Condition (Case 1) ........................................................... 222 Bus Collision During a Stop Condition (Case 2) ........................................................... 222 Bus Collision During Start Condition (SDAx Only) ..................................................... 219 Bus Collision for Transmit and Acknowledge ................................................... 218 Capture/Compare/PWM (Including ECCP Modules) ............................................... 358 CLKO and I/O .......................................................... 353
T
Table Pointer Operations (table) ........................................ 82 Table Reads/Table Writes ................................................. 61 TBLRD ............................................................................. 317 TBLWT ............................................................................. 318 Timer0 .............................................................................. 141 Associated Registers ............................................... 143 Operation ................................................................. 142 Overflow Interrupt .................................................... 143 Prescaler .................................................................. 143 Prescaler Assignment (PSA Bit) .............................. 143 Prescaler Select (T0PS2:T0PS0 Bits) ..................... 143 Prescaler. See Prescaler, Timer0. Reads and Writes in 16-Bit Mode ............................ 142 Source Edge Select (T0SE Bit) ................................ 142 Source Select (T0CS Bit) ......................................... 142 Switching Prescaler Assignment .............................. 143 Timer1 .............................................................................. 145 16-Bit Read/Write Mode ........................................... 147 Associated Registers ............................................... 149 Interrupt .................................................................... 148 Low-Power Option ................................................... 147 Operation ................................................................. 146 Oscillator .......................................................... 145, 147 Layout Considerations ..................................... 148 Oscillator, as Secondary Clock .................................. 30 Overflow Interrupt .................................................... 145
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Clock Synchronization ............................................. 204 Clock/Instruction Cycle .............................................. 62 EUSART Synchronous Receive (Master/Slave) .................................................. 367 EUSART Synchronous Transmission (Master/Slave) .................................................. 367 Example SPI Master Mode (CKE = 0) ..................... 359 Example SPI Master Mode (CKE = 1) ..................... 360 Example SPI Slave Mode (CKE = 0) ....................... 361 Example SPI Slave Mode (CKE = 1) ....................... 362 External Clock (All Modes Except PLL) ................... 351 External Memory Bus for Sleep (Extended Microcontroller Mode) ................. 92, 94 External Memory Bus for TBLRD (Extended Microcontroller Mode) ................. 92, 94 Fail-Safe Clock Monitor ............................................ 277 First Start Bit Timing ................................................ 212 Full-Bridge PWM Output .......................................... 175 Half-Bridge Output ................................................... 174 I2C Bus Data ............................................................ 363 I2C Bus Start/Stop Bits ............................................. 363 I2C Master Mode (7 or 10-Bit Transmission) .................................................. 215 I2C Master Mode (7-Bit Reception) .......................... 216 I2C Slave Mode (10-Bit Reception, SEN = 0) .......................................................... 201 I2C Slave Mode (10-Bit Reception, SEN = 1) .......................................................... 206 I2C Slave Mode (10-Bit Transmission) ..................... 202 I2C Slave Mode (7-bit Reception, SEN = 0) ............. 199 I2C Slave Mode (7-Bit Reception, SEN = 1) ............ 205 I2C Slave Mode (7-Bit Transmission) ....................... 200 I2C Slave Mode General Call Address Sequence (7 or 10-Bit Address Mode) ............. 207 I2C Stop Condition Receive or Transmit Mode ................................................. 217 Master SSP I2C Bus Data ........................................ 365 Master SSP I2C Bus Start/Stop Bits ........................ 365 Parallel Slave Port (PSP) Read ............................... 140 Parallel Slave Port (PSP) Write ............................... 139 Program Memory Read ............................................ 354 Program Memory Write ............................................ 355 PWM Auto-Shutdown (P1RSEN = 0, Auto-Restart Disabled) ..................................... 180 PWM Auto-Shutdown (P1RSEN = 1, Auto-Restart Enabled) ..................................... 180 PWM Direction Change ........................................... 177 PWM Direction Change at Near 100% Duty Cycle ............................................. 177 PWM Output ............................................................ 164 Repeated Start Condition ......................................... 213 Reset, Watchdog Timer (WDT), Oscillator Start-up Timer (OST) and Power-up Timer (PWRT) .......................... 356 Send Break Character Sequence ............................ 240 Slave Synchronization ............................................. 189 Slow Rise Time (MCLR Tied to VDD, VDD Rise > TPWRT) ............................................ 47 SPI Mode (Master Mode) ......................................... 188 SPI Mode (Slave Mode, CKE = 0) ........................... 190 SPI Mode (Slave Mode, CKE = 1) ........................... 190 Synchronous Reception (Master Mode, SREN) ...................................... 243 Synchronous Transmission ...................................... 241 Synchronous Transmission (Through TXEN) ............................................... 242 Time-out Sequence on Power-up (MCLR Not Tied to VDD), Case 1 ...................... 46 Time-out Sequence on Power-up (MCLR Not Tied to VDD), Case 2 ...................... 47 Time-out Sequence on Power-up (MCLR Tied to VDD, VDD Rise < TPWRT) ........... 46 Timer0 and Timer1 External Clock .......................... 357 Transition for Entry to Idle Mode ................................ 40 Transition for Entry to SEC_RUN Mode .................... 37 Transition for Entry to Sleep Mode ............................ 39 Transition for Two-Speed Start-up (INTRC to HSPLL) ........................................... 275 Transition for Wake from Idle to Run Mode .......................................................... 40 Transition for Wake from Sleep (HSPLL) .................. 39 Transition from RC_RUN Mode to PRI_RUN Mode ................................................. 38 Transition from SEC_RUN Mode to PRI_RUN Mode (HSPLL) .................................. 37 Transition to RC_RUN Mode ..................................... 38 Timing Diagrams and Specifications A/D Conversion Requirements ................................ 369 AC Characteristics Internal RC Accuracy ....................................... 352 Capture/Compare/PWM Requirements (Including ECCP Modules) .............................. 358 CLKO and I/O Requirements ........................... 353, 354 EUSART Synchronous Receive Requirements .................................................. 367 EUSART Synchronous Transmission Requirements .................................................. 367 Example SPI Mode Requirements (Master Mode, CKE = 0) .................................. 359 Example SPI Mode Requirements (Master Mode, CKE = 1) .................................. 360 Example SPI Mode Requirements (Slave Mode, CKE = 0) .................................... 361 Example SPI Slave Mode Requirements (CKE = 1) ......................................................... 362 External Clock Requirements .................................. 351 I2C Bus Data Requirements (Slave Mode) ................................................... 364 I2C Bus Start/Stop Bits Requirements (Slave Mode) ................................................... 363 Master SSP I2C Bus Data Requirements ................ 366 Master SSP I2C Bus Start/Stop Bits Requirements .................................................. 365 Parallel Slave Port Requirements ............................ 358 PLL Clock ................................................................ 352 Program Memory Write Requirements .................... 355 Reset, Watchdog Timer, Oscillator Start-up Timer, Power-up Timer and Brown-out Reset Requirements ........................................ 356 Timer0 and Timer1 External Clock Requirements ........................................ 357 Top-of-Stack Access .......................................................... 59 TRISE Register PSPMODE Bit .......................................................... 138 TSTFSZ ........................................................................... 319 Two-Speed Start-up ................................................. 267, 275 Two-Word Instructions Example Cases .......................................................... 63 TXSTAx Register BRGH Bit ................................................................. 229
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V
VDDCORE/VCAP Pin ........................................................... 274 Voltage Reference Specifications .................................... 348 Voltage Regulator (On-Chip) ........................................... 274
W
Watchdog Timer (WDT) ........................................... 267, 273 Associated Registers ............................................... 273 Control Register ....................................................... 273 During Oscillator Failure .......................................... 276 Programming Considerations .................................. 273 WCOL ...................................................... 212, 213, 214, 217 WCOL Status Flag ................................... 212, 213, 214, 217 WWW Address ................................................................. 387 WWW, On-Line Support ...................................................... 4
X
XORLW ............................................................................ 319 XORWF ............................................................................ 320
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NOTES:
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THE MICROCHIP WEB SITE
Microchip provides online support via our WWW site at www.microchip.com. This web site is used as a means to make files and information easily available to customers. Accessible by using your favorite Internet browser, the web site contains the following information: * Product Support - Data sheets and errata, application notes and sample programs, design resources, user's guides and hardware support documents, latest software releases and archived software * General Technical Support - Frequently Asked Questions (FAQ), technical support requests, online discussion groups, Microchip consultant program member listing * Business of Microchip - Product selector and ordering guides, latest Microchip press releases, listing of seminars and events, listings of Microchip sales offices, distributors and factory representatives
CUSTOMER SUPPORT
Users of Microchip products can receive assistance through several channels: * * * * * Distributor or Representative Local Sales Office Field Application Engineer (FAE) Technical Support Development Systems Information Line
Customers should contact their distributor, representative or field application engineer (FAE) for support. Local sales offices are also available to help customers. A listing of sales offices and locations is included in the back of this document. Technical support is available through the web site at: http://support.microchip.com In addition, there is a Development Systems Information Line which lists the latest versions of Microchip's development systems software products. This line also provides information on how customers can receive currently available upgrade kits. The Development numbers are: Systems Information Line
CUSTOMER CHANGE NOTIFICATION SERVICE
Microchip's customer notification service helps keep customers current on Microchip products. Subscribers will receive e-mail notification whenever there are changes, updates, revisions or errata related to a specified product family or development tool of interest. To register, access the Microchip web site at www.microchip.com, click on Customer Change Notification and follow the registration instructions.
1-800-755-2345 - United States and most of Canada 1-480-792-7302 - Other International Locations
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PIC18F87J10
READER RESPONSE
It is our intention to provide you with the best documentation possible to ensure successful use of your Microchip product. If you wish to provide your comments on organization, clarity, subject matter, and ways in which our documentation can better serve you, please FAX your comments to the Technical Publications Manager at (480) 792-4150. Please list the following information, and use this outline to provide us with your comments about this document. To: RE: Technical Publications Manager Reader Response Total Pages Sent ________
From: Name Company Address City / State / ZIP / Country Telephone: (_______) _________ - _________ Application (optional): Would you like a reply? Device: PIC18F87J10 Questions: 1. What are the best features of this document? Y N Literature Number: DS39663A FAX: (______) _________ - _________
2. How does this document meet your hardware and software development needs?
3. Do you find the organization of this document easy to follow? If not, why?
4. What additions to the document do you think would enhance the structure and subject?
5. What deletions from the document could be made without affecting the overall usefulness?
6. Is there any incorrect or misleading information (what and where)?
7. How would you improve this document?
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PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office. PART NO. Device X Temperature Range /XX Package XXX Pattern Examples:
a) b) Device PIC18F65J10/65J15/66J10/66J15/67J10(1), PIC18F85J10/85J15/86J10/86J15/87J10(1), PIC18F65J10/65J15/66J10/66J15/67J10T(2), PIC18F85J10/85J15/86J10/86J15/87J10T(2); PIC18F86J10-I/PT 301 = Industrial temp., TQFP package, QTP pattern #301. PIC18F65J15T-I/PT = Tape and reel, Industrial temp., TQFP package.
Temperature Range
I
= -40C to +85C (Industrial)
Package
PT
=
TQFP (Thin Quad Flatpack)
Pattern
QTP, SQTP, Code or Special Requirements (blank otherwise)
Note 1: 2:
F T
= Standard Voltage Range = in tape and reel
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WORLDWIDE SALES AND SERVICE
AMERICAS
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EUROPE
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10/20/04
DS39663A-page 392
Advance Information
2005 Microchip Technology Inc.

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