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Datasheet File OCR Text:

ST92185B
16K/24K/32K ROM HCMOS MCU WITH ON-SCREEN-DISPLAY
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Register File based 8/16 bit Core Architecture with RUN, WFI, SLOW and HALT modes 0C to +70C operating temperature range Up to 24 MHz. operation @ 5V10% Min. instruction cycle time: 165ns at 24 MHz. 16, 24 or 32 Kbytes ROM 256 bytes RAM of Register file (accumulators or index registers) 256 bytes of on-chip static RAM 2 Kbytes of TDSRAM (Display Storage RAM) 28 fully programmable I/O pins Serial Peripheral Interface Flexible Clock controller for OSD, Data Slicer and Core clocks running from a single low frequency external crystal. Enhanced display controller with: - 26 rows of 40 characters or 24 rows of 80 characters - Serial and Parallel attributes - 10x10 dot matrix, 512 ROM characters, definable by user - 4/3 and 16/9 supported in 50/60Hz and 100/ 120 Hz mode - Rounding, fringe, double width, double height, scrolling, cursor, full background color, halfintensity color, translucency and half-tone modes Integrated Sync Extractor and Sync Controller 14-bit Voltage Synthesis for tuning reference voltage Up to 6 external interrupts plus one NonMaskable Interrupt 8 x 8-bit programmable PWM outputs with 5V open-drain or push-pull capability 16-bit watchdog timer with 8-bit prescaler One 16-bit standard timer with 8-bit prescaler 4-channel A/D converter; 5-bit guaranteed
PSDIP56
PSDIP42
TQFP64
See end of Datasheet for ordering information
Rich instruction set and 14 addressing modes Versatile development tools, including Assembler, Linker, C-compiler, Archiver, Source Level Debugger and hardware emulators with Real-Time Operating System available from third parties s Pin-compatible EPROM and OTP devices available (ST92E195D7D1, ST92T195D7B1) s Pin-compatible with the ST92195 family with embedded teletext decoder Device Summary
s s
Device ST92185B1 ST92185B2 ST92185B3
Program Memory 16K ROM 24K ROM 32K ROM
TDSRAM 2K 2K 2K
VPS/ WSS No No No
October 2003
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Table of Contents
..................................................... ST92185B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1 GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1.1.1 ST9+ Core . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1.2 Power Saving Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1.3 I/O Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1.4 TV Peripherals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1.5 On Screen Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1.6 Voltage Synthesis Tuning Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1.7 PWM Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1.8 Serial Peripheral Interface (SPI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1.9 Standard Timer (STIM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1.10 Analog/Digital Converter (ADC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 PIN DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 6 6 6 6 7 7 7 7 7 9
1.2.1 I/O Port Alternate Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 1.2.2 I/O Port Styles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 1.3 MEMORY MAP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 1.4 REGISTER MAP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 2 DEVICE ARCHITECTURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 2.1 CORE ARCHITECTURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 2.2 MEMORY SPACES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 2.2.1 Register File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 2.2.2 Register Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 2.3 SYSTEM REGISTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 2.3.1 Central Interrupt Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.3.2 Flag Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.3.3 Register Pointing Techniques . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.3.4 Paged Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.3.5 Mode Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.3.6 Stack Pointers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.4 MEMORY ORGANIZATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 26 27 30 30 32 34
2.5 MEMORY MANAGEMENT UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 2.6 ADDRESS SPACE EXTENSION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 2.6.1 Addressing 16-Kbyte Pages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 2.6.2 Addressing 64-Kbyte Segments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 2.7 MMU REGISTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 2.7.1 DPR[3:0]: Data Page Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.7.2 CSR: Code Segment Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.7.3 ISR: Interrupt Segment Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.7.4 DMASR: DMA Segment Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.8 MMU USAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.8.1 Normal Program Execution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.8.2 Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178 . ... 2.8.3 DMA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 INTERRUPTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 39 39 39 41 41 41 41 42
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3.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 3.2 INTERRUPT VECTORING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 3.2.1 Divide by Zero trap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 3.2.2 Segment Paging During Interrupt Routines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 3.3 INTERRUPT PRIORITY LEVELS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 3.4 PRIORITY LEVEL ARBITRATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 3.4.1 Priority level 7 (Lowest) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.4.2 Maximum depth of nesting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.4.3 Simultaneous Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.4.4 Dynamic Priority Level Modification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5 ARBITRATION MODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 43 44 44 44
3.5.1 Concurrent Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 3.5.2 Nested Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 3.6 EXTERNAL INTERRUPTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 3.7 TOP LEVEL INTERRUPT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 3.8 ON-CHIP PERIPHERAL INTERRUPTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 3.9 INTERRUPT RESPONSE TIME . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 3.10 INTERRUPT REGISTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 4 RESET AND CLOCK CONTROL UNIT (RCCU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 4.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 4.2 RESET / STOP MANAGER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 4.3 OSCILLATOR CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 4.4 CLOCK CONTROL REGISTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 4.5 RESET CONTROL UNIT REGISTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 5 TIMING AND CLOCK CONTROLLER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 5.1 FREQUENCY MULTIPLIERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 5.2 REGISTER DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 5.2.1 Register Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 6 I/O PORTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 6.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 6.2 SPECIFIC PORT CONFIGURATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 6.3 PORT CONTROL REGISTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 6.4 INPUT/OUTPUT BIT CONFIGURATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 6.5 ALTERNATE FUNCTION ARCHITECTURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 6.5.1 Pin Declared as I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.5.2 Pin Declared as an Alternate Function Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.5.3 Pin Declared as an Alternate Function Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.6 I/O STATUS AFTER WFI, HALT AND RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 72 72 72
7 ON-CHIP PERIPHERALS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 7.1 TIMER/WATCHDOG (WDT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 7.1.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
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7.1.2 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.1.3 Watchdog Timer Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.1.4 WDT Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.1.5 Register Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.2 STANDARD TIMER (STIM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.2.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.2.2 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.2.3 Interrupt Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.2.4 Register Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.2.5 Register Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.3 DISPLAY STORAGE RAM INTERFACE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.3.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.3.2 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.3.3 Initialisation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.3.4 Register Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.4 ON SCREEN DISPLAY (OSD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.4.1 7.4.2 7.4.3 7.4.4 7.4.5 7.4.6 7.4.7 7.4.8 7.4.9 7.4.10 7.5 SYNC 74 75 77 78 80 80 81 82 82 83 84 84 85 86 87 88
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 General Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91 Programming the Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94 Vertical Scrolling Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110 Display Memory Mapping Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111 Font Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117 Font Mapping Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117 Register Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121 Application Software Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133 CONTROLLER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136 137 137 137 137 140 142 142 142 143 144 145 145 148 149 150 152
7.5.1 H/V Polarity Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.5.2 Field Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.5.3 Interrupt Generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.5.4 Sync Controller Working Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.5.5 Register Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.6 SERIAL PERIPHERAL INTERFACE (SPI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.6.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.6.2 Device-Specific Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.6.3 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.6.4 Interrupt Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.6.5 Working With Other Protocols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.6.6 I2C-bus Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.6.7 S-Bus Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.6.8 IM-bus Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.6.9 Register Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.7 A/D CONVERTER (A/D) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.7.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152 7.7.2 Main Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152 178
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7.7.3 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152 7.7.4 Register Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154 7.8 VOLTAGE SYNTHESIS TUNING CONVERTER (VS) . . . . . . . . . . . . . . . . . . . . . . . . . . 156 7.8.1 7.8.2 7.8.3 7.9 PWM Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Output Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Register Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GENERATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156 156 160 161 161 162 166 172 172
7.9.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.9.2 Register Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 ELECTRICAL CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.1 PACKAGE MECHANICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.2 ORDERING INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175 9.2.1 Transfer Of Customer Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175 10 REVISION HISTORY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177
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ST92185B - GENERAL DESCRIPTION
1 GENERAL DESCRIPTION
1.1 INTRODUCTION The ST92185B microcontroller is developed and manufactured by STMicroelectronics using a proprietary n-well HCMOS process. Its performance derives from the use of a flexible 256-register programming model for ultra-fast context switching and real-time event response. The intelligent onchip peripherals offload the ST9 core from I/O and data management processing tasks allowing critical application tasks to get the maximum use of core resources. The ST92185B MCU supports low power consumption and low voltage operation for power-efficient and low-cost embedded systems. 1.1.1 ST9+ Core The advanced Core consists of the Central Processing Unit (CPU), the Register File and the Interrupt controller. The general-purpose registers can be used as accumulators, index registers, or address pointers. Adjacent register pairs make up 16-bit registers for addressing or 16-bit processing. Although the ST9 has an 8-bit ALU, the chip handles 16-bit operations, including arithmetic, loads/stores, and memory/register and memory/memory exchanges. Two basic addressable spaces are available: the Memory space and the Register File, which includes the control and status registers of the onchip peripherals. 1.1.2 Power Saving Modes To optimize performance versus power consumption, a range of operating modes can be dynamically selected. Run Mode. This is the full speed execution mode with CPU and peripherals running at the maximum clock speed delivered by the Phase Locked Loop (PLL) of the Clock Control Unit (CCU). Wait For Interrupt Mode. The Wait For Interrupt (WFI) instruction suspends program execution until an interrupt request is acknowledged. During WFI, the CPU clock is halted while the peripheral and interrupt controller keep running at a frequency programmable via the CCU. In this mode, the power consumption of the device can be reduced by more than 95% (Low power WFI). Halt Mode. When executing the HALT instruction, and if the Watchdog is not enabled, the CPU and its peripherals stop operating and the status of the machine remains frozen (the clock is also stopped). A reset is necessary to exit from Halt mode. 1.1.3 I/O Ports Up to 28 I/O lines are dedicated to digital Input/ Output. These lines are grouped into up to five I/O Ports and can be configured on a bit basis under software control to provide timing, status signals, timer and output, analog inputs, external interrupts and serial or parallel I/O. 1.1.4 TV Peripherals A set of on-chip peripherals form a complete system for TV set and VCR applications: - Voltage Synthesis - Display RAM - OSD 1.1.5 On Screen Display The human interface is provided by the On Screen Display module, this can produce up to 26 lines of up to 80 characters from a ROM defined 512 character set. The character resolution is 10x10 dot. Four character sizes are supported. Serial attributes allow the user to select foreground and background colors, character size and fringe background. Parallel attributes can be used to select additional foreground and background colors and underline on a character by character basis. Note: The OSD cell is common to all ST92x195 family devices. However, its capabilities are limited by a TDSRAM memory size of 2Kbytes on the ST92185 family. Certain display modes using more than 2Kbytes of memory are not available.
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ST92185B - GENERAL DESCRIPTION
INTRODUCTION (Cont'd) 1.1.6 Voltage Synthesis Tuning Control 14-bit Voltage Synthesis using the PWM (Pulse Width Modulation)/BRM (Bit Rate Modulation) technique can be used to generate tuning voltages for TV set applications. The tuning voltage is output on one of two separate output pins. 1.1.7 PWM Output Control of TV settings can be made with up to eight 8-bit PWM outputs, with a maximum frequency of 23,437Hz at 8-bit resolution (INTCLK = 12 MHz). Low resolutions with higher frequency operation can be programmed. 1.1.8 Serial Peripheral Interface (SPI) The SPI bus is used to communicate with external devices via the SPI, or IC bus communication standards. The SPI uses a single data line for data input and output. A second line is used for a synchronous clock signal. 1.1.9 Standard Timer (STIM) The ST92185B has one Standard Timer (STIM0) that includes a programmable 16-bit down counter and an associated 8-bit prescaler with Single and Continuous counting modes. 1.1.10 Analog/Digital Converter (ADC) In addition there is a 4-channel Analog to Digital Converter with integral sample and hold, fast 5.75s conversion time and 6-bit guaranteed resolution.
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ST92185B - GENERAL DESCRIPTION
INTRODUCTION (Cont'd) Figure 1. ST92185B Block Diagram
24/32 Kbytes ROM 256 bytes RAM 2 Kbytes TDSRAM TRI I/O PORT 0
8
P0[7:0]
I/O PORT 2
6
P2[5:0]
I/O PORT 3 MEMORY BUS
4
P3[7:4]
256 bytes Register File 8/16-bit CPU
I/O PORT 4
8
P4[7:0]
NMI INT[7:4] INT2 INT0
MMU Interrupt Management ST9+ CORE
I/O PORT 5
2
P5[1:0]
ADC
OSCIN OSCOUT RESET RESETO
AIN[4:1] EXTRG
RCCU 16-BIT TIMER/ WATCHDOG SYNC CONTROL ON SCREEN DISPLAY VSYNC HSYNC/CSYNC CSO FREQ. PXFM MULTIP. R/G/B/FB TSLU HT
SDO/SDI SCK
SPI
MCFM
TIMING AND CLOCK CTRL STANDARD TIMER VOLTAGE SYNTHESIS
REGISTER BUS
PWM D/A CONVERTER
PWM[7:0]
STOUT
VSO[2:1]
All alternate functions (Italic characters) are mapped on Ports 0, 2, 3, 4 and 5
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ST92185B - GENERAL DESCRIPTION
1.2 PIN DESCRIPTION RESET Reset (input, active low). The ST9+ is initialised by the Reset signal. With the deactivation of RESET, program execution begins from the Program memory location pointed to by the vector contained in program memory locations 00h and 01h. R/G/B Red/Green/Blue. Video color analog DAC outputs. FB Fast Blanking. Video analog DAC output. VDD Main power supply voltage (5V10%, digital) VPP: On EPROM/OTP devices, V PP is the programming voltage pin. VPP should be tied to GND in user mode. MCFM Analog pin for the display pixel frequency multiplier. OSCIN, OSCOUT Oscillator (input and output). These pins connect a parallel-resonant crystal (24MHz maximum), or an external source to the on-chip clock oscillator and buffer. OSCIN is the input of the oscillator inverter and internal clock generator; OSCOUT is the output of the oscillator inverter. Figure 2. 56-Pin Package Pin-Out
INT7/P2.0 RESET P0.7 P0.6 P0.5 P0.4 P0.3 AIN4/P0.2 P0.1 P0.0 CSO/RESET0/P3.7 P3.6 P3.5 P3.4 B G R FB SDI/SDO/P5.1 SCK/INT2/P5.0 VDD JTDO N.C VPP AVDD3 TEST0 MCFM JTCK 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 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 P2.1/INT5/AIN1 P2.2/INT0/AIN2 P2.3/INT6/VS01 P2.4/NMI P2.5/AIN3/INT4/VS02 OSCIN OSCOUT P4.7/PWM7/EXTRG/STOUT P4.6/PWM6 P4.5/PWM5 P4.4/PWM4 P4.3/PWM3/TSLU/HT P4.2/PWM2 P4.1/PWM1 P4.0/PWM0 VSYNC HSYNC/CSYNC AVDD1 PXFM JTRSTO GND AGND N.C N.C JTMS AVDD2 CVBSO N.C
VSYNC Vertical Sync. Vertical video synchronisation input to OSD. Positive or negative polarity. HSYNC/CSYNC Horizontal/Composite sync. Horizontal or composite video synchronisation input to OSD. Positive or negative polarity. PXFM Analog pin for the Display Pixel Frequency Multiplier AVDD3 Analog V DD of PLL. This pin must be tied to VDD externally. GND Digital circuit ground. AGND Analog circuit ground (must be tied externally to digital GND). AVDD1, AVDD2 Analog power supplies (must be tied externally to VDD). CVBSO, JTDO, JTCK, JTMS Test pins: leave floating. TEST0 Test pin: must be tied to AVDD2. JTRST0 Test pin: must be tied to GND.
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U1 P20 Y1 4Mhz C3 39pF +5V L1 10uH P21 P22 P23 P24 P25 C1 39pF P07 P06 P05 P04 P03 P02 P01 P00 P37 P36 P35 P34 P47 P46 P45 P44 P43 P42 P41 P40 VSYNC HSYNC B G R FB P51 P50 C5 100nF 10F C7 C8 R2 5.6k 22pF 4.7nF C10 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 P2.0/INT7 RESETN P0.7 P0.6 P0.5 P0.4 P0.3 P0.2/AIN4 P0.1 P0.0 P3.7/RESET0/CSO P3.6 P3.5 P3.4 B G R FB P5.1/SDI/SDO P5.0/SCK/INT2 VDD JTDO N.C N.C AVDD3 TEST0 MCFM JTCK SDIP56 100nF C12 P2.1/INT5/AIN1 P2.2/INT0/AIN2 P2.3/INT6/VS01 P2.4/NMI P 2. 5 / A I N 3 / I NT 4 / V S0 2 OSCIN OSCOUT P4.7/PWM7/EXTRG/STOUT P4.6/PWM6 P4.5/PWM5 P4.4/PWM4 P4.3/PWM3/TSLU P4.2/PWM2 P4.1/PWM1 {92185} P4.0/PWM0 VSYNC HSYNC/CSYNC AVDD1 PXFM JTRSTO GND AGND N.C N.C JTMS AVDD2 CVBSO N.C 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29
+5V
L2
PIN DESCRIPTION (Cont'd)
10uH
1F C2
R1
10k
S1
D1
ST92185B - GENERAL DESCRIPTION
RST
1N4148
C4
10F
C6
100nF
C9
100nF
Figure 3. ST92185B Required External components (56-pin package)
C11
22pF
C13
4.7nF R3
5.6k
ST92185B - GENERAL DESCRIPTION
PIN DESCRIPTION (Cont'd) Figure 4.. 42-Pin Package Pin-Out
INT7/P2.0 RESET P0.7 P0.6 P0.5 P0.4 P0.3 AIN4/P0.2 P0.1 P0.0 CSO/RESET0/P3.7 P3.6 P3.5 P3.4 B G R FB SDI/SDO/P5.1 SCK/INT2/P5.0 VDD
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22
P2.1/INT5/AIN1 P2.2/INT0/AIN2 P2.3/INT6/VS01 P2.4/NMI P2.5/AIN3/INT4/VS02 OSCIN OSCOUT P4.7/PWM7/EXTRG/STOUT P4.6/PWM6 P4.5/PWM5 P4.4/PWM4 P4.3/PWM3/TSLU/HT P4.2/PWM2 P4.1/PWM1 P4.0/PWM0 VSYNC HSYNC/CSYNC TEST0 PXFM MCFM GND
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U1 P20 Y1 4Mhz C3 P47 P46 P45 P44 P43 P42 P41 P40 VSYNC HSYNC 39pF C1 39pF P21 P22 P23 P24 P25 P07 P06 P05 P04 P03 P02 P01 P00 P37 P36 P35 P34 B G R FB P51 P50 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 P2.0/INT7 RESETN P0.7 P0.6 P0.5 P0.4 P0.3 P0.2/AIN4 P0.1 P0.0 P3.7/RESET0/CSO P3.6 P3.5 P3.4 B G R FB P5.1/SDI/SDO/INT1 P5.0/SCK/INT2 VDD SDIP42 R3 5.6k C8 22pF C9 4.7nF C7 4.7nF R2 5.6k C5 22pF P2.1/INT5/AIN1 P2.2/INT0/AIN2 P2.3/INT6/VS01 P2.4/NMI P2.5/AIN3/INT4/VS02 OSCIN OSCOUT P4.7/PWM7/EXTRG/STOUT P4.6/PWM6 P4.5/PWM5 P4.4/PWM4 {92185} P4.3/PWM3/TSLU P4.2/PWM2 P4.1/PWM1 P4.0/PWM0 VSYNC HSYNC TEST0 PXFM MCFM GND 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22
+5V
L1
10uH
C2
1F
R1
10k
S1
D1
ST92185B - GENERAL DESCRIPTION
RST
1N4148
C4
10F
Figure 5. ST92185B Required External Components (42-pin package)
C6
100nF
ST92185B - GENERAL DESCRIPTION
Figure 6. 64-Pin Package Pin-Out
VDD P0.3 P0.4 P0.5 P0.6 P0.7 RESET P2.0/INT7 P2.1/INT5/AIN1 P2.2/INT0/AIN2 P2.3/INT6/VS01 P2.4/NMI P2.5/AIN3/INT4/VS02 OSCIN OSCOUT VDD GND AIN4/P0.2 P0.1 P0.0 CSO/RESET0/P3.7 P3.6 P3.5 P3.4 B G R FB SDO/SDI/P5.1 INT2/SCK/P5.0 VDD JTDO 1 64 48 16 N.C. N.C. N.C 32 AVDD3 TEST0 MCFM JTCK N.C CVBSO AVDD2 JTMS N.C N.C AGND N.C. VSS P4.7/PWM7/EXTRG/STOUT P4.6/PWM6 P4.5/PWM5 P4.4/PWM4 P4.3/PWM3/TSLU/HT P4.2/PWM2 P4.1/PWM1 P4.0/PWM0 VSYNC HSYNC/CSYNC AVDD1 PXFM JTRST0 GND N.C.
Note: N.C = Not connected
VPP
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ST92185B - GENERAL DESCRIPTION
PIN DESCRIPTION (Cont'd) P0[7:0], P2[5:0], P3[7:4], P4[7:0], P5[1:0] I/O Port Lines (Input/Output, TTL or CMOS compatible). 28 lines grouped into I/O ports, bit programmable as general purpose I/O or as Alternate functions (see I/O section).
Important: Note that open-drain outputs are for logic levels only and are not true open drain. 1.2.1 I/O Port Alternate Functions. Each pin of the I/O ports of the ST92185B may assume software programmable Alternate Functions (see Table 1).
Table 1. ST92185B I/O Port Alternate Function Summary
Port Name P0.0 P0.1 P0.2 P0.3 P0.4 P0.5 P0.6 P0.7 P2.0 P2.1 General Purpose I/O Pin No. SDIP42 10 9 8 7 6 5 4 3 1 42 SDIP56 10 9 8 7 6 5 4 3 1 56 INT7 AIN1 INT5 INT0 AIN2 INT6 VSO1 NMI AIN3 38 52 INT4 VSO2 P3.4 P3.5 P3.6 P3.7 P4.0 P4.1 P4.2 14 13 12 11 28 29 30 14 13 12 11 42 43 44 RESET0 CSO PWM0 PWM1 PWM2 PWM3 P4.3 31 45 TSLU HT P4.4 32 46 PWM4 AIN4 I/O I/O I I/O I/O I/O I/O I/O I I I I I I O I I I O I/O I/O I/O O O O O O O O O O Internal Reset Output Composite Sync output PWM Output 0 PWM Output 1 PWM Output 2 PWM Output 3 Translucency Digital Output Half-tone Output PWM Output 4 External Interrupt 7 A/D Analog Data Input 1 External Interrupt 5 External Interrupt 0 A/D Analog Data Input 2 External Interrupt 6 Voltage Synthesis Output 1 Non Maskable Interrupt Input A/D Analog Data Input 3 External Interrupt 4 Voltage Synthesis Output 2 A/D Analog Data Input 4 Alternate Functions
P2.2
41
55
P2.3 P2.4
All ports useable for general purpose I/O (input, output or bidirectional)
40 39
54 53
P2.5
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ST92185B - GENERAL DESCRIPTION
Port Name P4.5 P4.6 All ports useable for general purpose I/O (input, output or bidirectional) General Purpose I/O Pin No. SDIP42 33 34 SDIP56 47 48 PWM5 PWM6 EXTRG 35 49 PWM7 STOUT 20 20 INT2 SCK SDO SDI O O I O O I O O I Alternate Functions PWM Output 5 PWM Output 6 A/D Converter External Trigger Input PWM Output 7 Standard Timer Output External Interrupt 2 SPI Serial Clock SPI Serial Data Out SPI Serial Data In
P4.7
P5.0
P5.1
19
19
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ST92185B - GENERAL DESCRIPTION
PIN DESCRIPTION (Cont'd) 1.2.2 I/O Port Styles
Pins P0[7:0] P2[5,4,3,2] P2[1,0] P3.7 P3[6,5,4] P4[7:0] P5[1:0] Weak Pull-Up no no no yes no no no Port Style Standard I/O Standard I/O Schmitt trigger Standard I/O Standard I/O Standard I/O Standard I/O Reset Values BID / OD / TTL BID / OD / TTL BID / OD / TTL AF / PP / TTL BID / OD / TTL BID / OD / TTL BID / OD / TTL
Legend:
AF= Alternate Function, BID = Bidirectional, OD = Open Drain PP = Push-Pull, TTL = TTL Standard Input Levels
How to Read this Table To configure the I/O ports, use the information in this table and the Port Bit Configuration Table in the I/O Ports Chapter on page 69. Port Style= the hardware characteristics fixed for each port line. Inputs: - If port style = Standard I/O, either TTL or CMOS input level can be selected by software. - If port style = Schmitt trigger, selecting CMOS or TTL input by software has no effect, the input will always be Schmitt Trigger. Weak Pull-Up = This column indicates if a weak pull-up is present or not. - If WPU = yes, then the WPU can be enabled/disable by software - If WPU = no, then enabling the WPU by software has no effect Alternate Functions (AF) = More than one AF cannot be assigned to an external pin at the same time: An alternate function can be selected as follows. AF Inputs: - AF is selected implicitly by enabling the corresponding peripheral. Exception to this are ADC analog inputs which must be explicitly selected as AF by software. AF Outputs or Bidirectional Lines: - In the case of Outputs or I/Os, AF is selected explicitly by software.
Example 1: ADC trigger digital input AF: EXTRG, Port: P4.7, Port Style: Standard I/O. Write the port configuration bits (for TTL level): P4C2.7=1 P4C1.7=0 P4C0.7=1 Enable the ADC trigger by software as described in the ADC chapter. Example 2: PWM 0 output AF: PWM0, Port: P4.0 Write the port configuration bits (for output pushpull): P4C2.0=0 P4C1.0=1 P4C0.0=1 Example 3: ADC analog input AF: AIN1, Port : P2.1, Port style: does not apply to analog inputs Write the port configuration bits: P2C2.1=1 P2C1.1=1 P2C0.1=1
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ST92185B - GENERAL DESCRIPTION
1.3 MEMORY MAP Internal ROM The ROM memory is mapped in a single continuous area starting at address 0000h in MMU segment 00h.
Device ST92185B1 ST92185B2 ST92185B3 Size 16K 24K 32K Start Address 0000h 0000h 0000h End Address 3FFFh 5FFFh 7FFFh ST92185B1/B2/B3 2K
Internal RAM, 256 bytes The internal RAM is mapped in MMU segment 20h; from address FF00h to FFFFh. Internal TDSRAM The Internal TDSRAM is mapped starting at address 8000h in MMU segment 22h. It is a fully static memory.
Device Size Start Address 8000h End Address 87FFh
Figure 7. ST92185B Memory Map
2287FFh
2Kbytes TDSRAM
228000h
Reserved
22FFFFh 22C000h 22BFFFh 228000h 227FFFh
PAGE 91 - 16 Kbytes PAGE 90 - 16 Kbytes PAGE 89 - 16 Kbytes PAGE 88 - 16 Kbytes
SEGMENT 22h 64 Kbytes
Reserved
224000h 223FFFh
Reserved
220000h 21FFFFh
SEGMENT 21h 64 Kbytes
Reserved
Internal RAM 256 bytes
20FFFFh
210000h 20FFFFh
PAGE 83 - 16 Kbytes
20C000h 20BFFFh
20FF00h
SEGMENT 20h 64 Kbytes
Reserved Reserved
PAGE 82 - 16 Kbytes
208000h 207FFFh
PAGE 81 - 16 Kbytes
204000h 203FFFh
Reserved
200000h 00FFFFh 007FFFh 32 Kbytes 005FFFh 24 Kbytes 003FFFh SEGMENT 0 Internal ROM 64 Kbytes 24K bytesROM Internal 16K bytes 000000h
PAGE 80 - 16 Kbytes
PAGE 3 - 16 Kbytes
00C000h 00BFFFh
Internal ROM max. 64 Kbytes
PAGE 2 - 16 Kbytes
008000h 007FFFh
PAGE 1 - 16 Kbytes
004000h 003FFFh
PAGE 0 - 16 Kbytes
000000h
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ST92185B - GENERAL DESCRIPTION
1.4 REGISTER MAP The following pages contain a list of ST92185B registers, grouped by peripheral or function. Be very careful to correctly program both: - The set of registers dedicated to a particular function or peripheral. - Registers common to other functions. Group F Pages Register Map
Register Page 0 R255 R254 SPI R253 R252 R251 R250 WDT R249 R248 OSD R247 R246 Res. R245 R244 R243 R242 STIM R241 Res. R240 Port 0 Port 4 Res. A/D EXT INT Res. Port 5 Res Res. Res. Res. PWM Port 2 Res. Res. WCR TSU Res. Res. MMU Port 3 TCC TDSRAM Res. 2 Res. Res. Res RCCU (PLL) Res. 3 11 21 32 33 35 38 39 Res. VS 55 59 62
In particular, double-check that any registers with "undefined" reset values have been correctly initialised. Warning: Note that in the EIVR and each IVR register, all bits are significant. Take care when defining base vector addresses that entries in the Interrupt Vector table do not overlap.
Res.
MMU SYNC
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ST92185B - GENERAL DESCRIPTION
Table 2. Detailed Register Map
Group F Page Dec. Block Reg. No. R224 I/O Port 0:5 R226 R227 R228 R229 R230 R231 N/A R232 R233 Core R234 R235 R236 R237 R238 R239 R242 R243 INT R244 R245 R246 R247 0 WDT R248 R249 R250 R251 R252 SPI I/O Port 0 I/O 2 Port 2 I/O Port 3 R253 R254 R240 R241 R242 R248 R249 R250 R252 R253 R254 Register Name P0DR P2DR P3DR P4DR P5DR CICR FLAGR RP0 RP1 PPR MODER USPHR USPLR SSPHR SSPLR EITR EIPR EIMR EIPLR EIVR NICR WDTHR WDTLR WDTPR WDTCR WCR SPIDR SPICR P0C0 P0C1 P0C2 P2C0 P2C1 P2C2 P3C0 P3C1 P3C2 Description Port 0 Data Register Port 2 Data Register Port 3 Data Register Port 4 Data Register Port 5 Data Register Central Interrupt Control Register Flag Register Pointer 0 Register Pointer 1 Register Page Pointer Register Mode Register User Stack Pointer High Register User Stack Pointer Low Register System Stack Pointer High Reg. System Stack Pointer Low Reg. External Interrupt Trigger Register External Interrupt Pending Reg. External Interrupt Mask-bit Reg. External Interrupt Priority Level Reg. External Interrupt Vector Register Nested Interrupt Control Watchdog Timer High Register Watchdog Timer Low Register Watchdog Timer Prescaler Reg. Watchdog Timer Control Register Wait Control Register SPI Data Register SPI Control Register Port 0 Configuration Register 0 Port 0 Configuration Register 1 Port 0 Configuration Register 2 Port 2 Configuration Register 0 Port 2 Configuration Register 1 Port 2 Configuration Register 2 Port 3 Configuration Register 0 Port 3 Configuration Register 1 Port 3 Configuration Register 2 Reset Value Hex. FF FF FF FF FF 87 00 xx xx xx E0 xx xx xx xx 00 00 00 FF x6 00 FF FF FF 12 7F xx 00 00 00 00 00 00 00 00 00 00 66 53 26 28 28 30 30 33 33 33 33 53 54 54 54 55 55 78 78 78 78 79 150 150 66 Doc. Page
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ST92185B - GENERAL DESCRIPTION
Group F Page Dec. Block I/O Port 3 4 I/O Port 5 Reg. No. R240 R241 R242 R244 R245 R246 R240 11 STIM R241 R242 R243 R240 R241 R242 MMU 21 R243 R244 R248 R249 Ext.Mem. R246 R240 R241 R242 R243 R244 R245 R246 32 OSD R247 R248 R249 R250 R251 R252 R253 R254 R255 R240 33 R241 R246 R247 35 38 SYNC TDSRAM R242 R243 R252 Register Name P4C0 P4C1 P4C2 P5C0 P5C1 P5C2 STH STL STP STC DPR0 DPR1 DPR2 DPR3 CSR ISR DMASR EMR2 HBLANKR HPOSR VPOSR FSCCR HSCR NCSR CHPOSR CVPOSR SCLR SCHR DCM0R DCM1R TDPR DE0R DE1R DE2R DCR CAPVR TDPPR TDHSPR SCCS0R SCCS1R CONFIG Description Port 4 Configuration Register 0 Port 4 Configuration Register 1 Port 4 Configuration Register 2 Port 5 Configuration Register 0 Port 5 Configuration Register 1 Port 5 Configuration Register 2 Counter High Byte Register Counter Low Byte Register Standard Timer Prescaler Register Standard Timer Control Register Data Page Register 0 Data Page Register 1 Data Page Register 2 Data Page Register 3 Code Segment Register Interrupt Segment Register DMA Segment Register External Memory Register 2 Horizontal Blank Register Horizontal Position Register Vertical Position Register Full Screen Color Control Register Header & Status Control Register National Character Set Control Register Cursor Horizontal Position Register Cursor Vertical Position Register Scrolling Control Low Register Scrolling Control High Register Display Control Mode 0 Register Display Control Mode 1 Register TDSRAM Pointer Register Display Enable 0 Control Register Display Enable 1 Control Register Display Enable 2 Control Register Default Color Register Cursor Absolute Vertical Position Register TDSRAM Page Pointer Register TDSRAM Header/Status Pointer Register Sync Controller Control and Status Register 0 Sync Controller Control and Status Register 1 TDSRAM Interface Configuration Register Reset Value Hex. 00 00 00 00 00 00 FF FF FF 14 xx xx xx xx 00 xx xx 0F 03 03 00 00 2A 00 00 00 00 00 00 00 00 FF FF xF 70 00 x0 x0 00 00 02 83 83 83 83 38 38 38 38 39 39 39 56 121 121 121 122 123 124 125 125 126 127 129 130 130 131 131 131 132 132 132 132 140 141 87 66 Doc. Page
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Group F Page Dec. Block Reg. No. R251 39 TCC R252 R253 R254 R251 55 RCCU R254 R240 R241 R242 R243 R244 R245 PWM 59 R246 R247 R248 R249 R250 R251 R252 VS R254 R255 R240 62 ADC R241 R242 Register Name PXCCR SLCCR MCCR SKCCR PCONF SDRATH CM0 CM1 CM2 CM3 CM4 CM5 CM6 CM7 ACR CCR PCTL OCPL OER VSDR1 VSDR2 ADDTR ADCLR ADINT Description PLL Clock Control Register Slicer Clock Control Register Main Clock Control Register Skew Clock Control Register PLL Configuration Register Clock Slow Down Unit Ratio Register Compare Register 0 Compare Register 1 Compare Register 2 Compare Register 3 Compare Register 4 Compare Register 5 Compare Register 6 Compare Register 7 Autoclear Register Counter Register Prescaler and Control Register Output Complement Register Output Enable Register Data and Control Register 1 Data Register 2 Channel i Data Register Control Logic Register AD Interrupt Register Reset Value Hex. 00 00 00 00 07 2x,4x or 00 00 00 00 00 00 00 00 00 FF 00 0C 00 00 00 00 xx 00 01 Doc. Page 66 66 65 65 61 61 163 163 163 163 163 163 163 163 164 164 164 165 165 160 160 155 154 155
Note: xx denotes a byte with an undefined value, however some of the bits may have defined values. Refer to register description for details.
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2 DEVICE ARCHITECTURE
2.1 CORE ARCHITECTURE which hold data and control bits for the on-chip peripherals and I/Os. - A single linear memory space accommodating both program and data. All of the physically separate memory areas, including the internal ROM, internal RAM and external memory are mapped in this common address space. The total addressable memory space of 4 Mbytes (limited by the size of on-chip memory and the number of external address pins) is arranged as 64 segments of 64 Kbytes. Each segment is further subdivided into four pages of 16 Kbytes, as illustrated in Figure 1. A Memory Management Unit uses a set of pointer registers to address a 22-bit memory field using 16-bit address-based instructions. 2.2.1 Register File The Register File consists of (see Figure 2): 2.2 MEMORY SPACES - 224 general purpose registers (Group 0 to D, There are two separate memory spaces: registers R0 to R223) - The Register File, which comprises 240 8-bit - 6 system registers in the System Group (Group registers, arranged as 15 groups (Group 0 to E), E, registers R224 to R239) each containing sixteen 8-bit registers plus up to - Up to 64 pages, depending on device configura64 pages of 16 registers mapped in Group F, tion, each containing up to 16 registers, mapped to Group F (R240 to R255), see Figure 3. Figure 8. Single Program and Data Memory Address Space
Address
3FFFFFh 3F0000h 3EFFFFh 3E0000h
The ST9 Core or Central Processing Unit (CPU) features a highly optimised instruction set, capable of handling bit, byte (8-bit) and word (16-bit) data, as well as BCD and Boolean formats; 14 addressing modes are available. Four independent buses are controlled by the Core: a 16-bit Memory bus, an 8-bit Register data bus, an 8-bit Register address bus and a 6-bit Interrupt/DMA bus which connects the interrupt and DMA controllers in the on-chip peripherals with the Core. This multiple bus architecture affords a high degree of pipelining and parallel operation, thus making the ST9 family devices highly efficient, both for numerical calculation, data handling and with regard to communication with on-chip peripheral resources.
Data 16K Pages
255 254 253 252 251 250 249 248 247
Code 64K Segments
63
62
up to 4 Mbytes
135 134 133 132
21FFFFh 210000h 20FFFFh
Reserved
33
02FFFFh 020000h 01FFFFh 010000h 00FFFFh 000000h
11 10 9 8 7 6 5 4 3 2 1 0
2
1
0
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MEMORY SPACES (Cont'd) Figure 9. Register Groups
UP TO 64 PAGES PAGE 5 R255 PAGE 0
Figure 10. Page Pointer for Group F mapping
PAGE 63
255 240 F PAGED REGISTERS 239 E SYSTEM REGISTERS 224 223 D C B A 9 8 7 6 5 4 3 2 1 0 0 15 0
R240 R234 224 GENERAL PURPOSE REGISTERS R224 PAGE POINTER
VA00432
R0
VA00433
Figure 11. Addressing the Register File
REGISTER FILE 255 240 F PAGED REGISTERS 239 E SYSTEM REGISTERS 224 223 D C B A 9 8 7 6 5 4 3 2 1 0 0 15 0
VR000118
GROUP D R195 (R0C3h) R207
(1100) (0011) GROUP C
R195 R192 GROUP B
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MEMORY SPACES (Cont'd) 2.2.2 Register Addressing Register File registers, including Group F paged registers (but excluding Group D), may be addressed explicitly by means of a decimal, hexadecimal or binary address; thus R231, RE7h and R11100111b represent the same register (see Figure 4). Group D registers can only be addressed in Working Register mode. Note that an upper case "R" is used to denote this direct addressing mode. Working Registers Certain types of instruction require that registers be specified in the form "rx", where x is in the range 0 to 15: these are known as Working Registers. Note that a lower case "r" is used to denote this indirect addressing mode. Two addressing schemes are available: a single group of 16 working registers, or two separately mapped groups, each consisting of 8 working registers. These groups may be mapped starting at any 8 or 16 byte boundary in the register file by means of dedicated pointer registers. This technique is described in more detail in Section 1.3.3, and illustrated in Figure 5 and in Figure 6. System Registers The 16 registers in Group E (R224 to R239) are System registers and may be addressed using any of the register addressing modes. These registers are described in greater detail in Section 1.3. Paged Registers Up to 64 pages, each containing 16 registers, may be mapped to Group F. These are addressed using any register addressing mode, in conjunction with the Page Pointer register, R234, which is one of the System registers. This register selects the page to be mapped to Group F and, once set, does not need to be changed if two or more registers on the same page are to be addressed in succession. Therefore if the Page Pointer, R234, is set to 5, the instructions: spp #5 ld R242, r4 will load the contents of working register r4 into the third register of page 5 (R242). These paged registers hold data and control information relating to the on-chip peripherals, each peripheral always being associated with the same pages and registers to ensure code compatibility between ST9 devices. The number of these registers therefore depends on the peripherals which are present in the specific ST9 family device. In other words, pages only exist if the relevant peripheral is present. Table 3. Register File Organization
Hex. Address F0-FF E0-EF D0-DF C0-CF B0-BF A0-AF 90-9F 80-8F 70-7F 60-6F 50-5F 40-4F 30-3F 20-2F 10-1F 00-0F Decimal Address 240-255 224-239 208-223 192-207 176-191 160-175 144-159 128-143 112-127 96-111 80-95 64-79 48-63 32-47 16-31 00-15 General Purpose Registers Function Paged Registers System Registers Register File Group Group F Group E Group D Group C Group B Group A Group 9 Group 8 Group 7 Group 6 Group 5 Group 4 Group 3 Group 2 Group 1 Group 0
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2.3 SYSTEM REGISTERS The System registers are listed in Table 2 System Registers (Group E). They are used to perform all the important system settings. Their purpose is described in the following pages. Refer to the chapter dealing with I/O for a description of the PORT[5:0] Data registers. Table 4. System Registers (Group E)
R239 (EFh) R238 (EEh) R237 (EDh) R236 (ECh) R235 (EBh) R234 (EAh) R233 (E9h) R232 (E8h) R231 (E7h) R230 (E6h) R229 (E5h) R228 (E4h) R227 (E3h) R226 (E2h) R225 (E1h) R224 (E0h) SSPLR SSPHR USPLR USPHR MODE REGISTER PAGE POINTER REGISTER REGISTER POINTER 1 REGISTER POINTER 0 FLAG REGISTER CENTRAL INT. CNTL REG PORT5 DATA REG. PORT4 DATA REG. PORT3 DATA REG. PORT2 DATA REG. PORT1 DATA REG. PORT0 DATA REG.
Note: If an MFT is not included in the ST9 device, then this bit has no effect. Bit 6 = TLIP: Top Level Interrupt Pending. This bit is set by hardware when a Top Level Interrupt Request is recognized. This bit can also be set by software to simulate a Top Level Interrupt Request. 0: No Top Level Interrupt pending 1: Top Level Interrupt pending Bit 5 = TLI: Top Level Interrupt bit. 0: Top Level Interrupt is acknowledged depending on the TLNM bit in the NICR Register. 1: Top Level Interrupt is acknowledged depending on the IEN and TLNM bits in the NICR Register (described in the Interrupt chapter). Bit 4 = IEN: Interrupt Enable . This bit is cleared by interrupt acknowledgement, and set by interrupt return (iret). IEN is modified implicitly by iret, ei and di instructions or by an interrupt acknowledge cycle. It can also be explicitly written by the user, but only when no interrupt is pending. Therefore, the user should execute a di instruction (or guarantee by other means that no interrupt request can arrive) before any write operation to the CICR register. 0: Disable all interrupts except Top Level Interrupt. 1: Enable Interrupts Bit 3 = IAM: Interrupt Arbitration Mode. This bit is set and cleared by software to select the arbitration mode. 0: Concurrent Mode 1: Nested Mode. Bits 2:0 = CPL[2:0]: Current Priority Level. These three bits record the priority level of the routine currently running (i.e. the Current Priority Level, CPL). The highest priority level is represented by 000, and the lowest by 111. The CPL bits can be set by hardware or software and provide the reference according to which subsequent interrupts are either left pending or are allowed to interrupt the current interrupt service routine. When the current interrupt is replaced by one of a higher priority, the current priority value is automatically stored until required in the NICR register.
2.3.1 Central Interrupt Control Register Please refer to the "INTERRUPT" chapter for a detailed description of the ST9 interrupt philosophy. CENTRAL INTERRUPT CONTROL REGISTER (CICR) R230 - Read/Write Register Group: E (System) Reset Value: 1000 0111 (87h)
7 GCEN TLIP TLI IEN IAM 0 CPL2 CPL1 CPL0
Bit 7 = GCEN: Global Counter Enable. This bit is the Global Counter Enable of the Multifunction Timers. The GCEN bit is ANDed with the CE bit in the TCR Register (only in devices featuring the MFT Multifunction Timer) in order to enable the Timers when both bits are set. This bit is set after the Reset cycle.
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SYSTEM REGISTERS (Cont'd) 2.3.2 Flag Register The Flag Register contains 8 flags which indicate the CPU status. During an interrupt, the flag register is automatically stored in the system stack area and recalled at the end of the interrupt service routine, thus returning the CPU to its original status. This occurs for all interrupts and, when operating in nested mode, up to seven versions of the flag register may be stored. FLAG REGISTER (FLAGR) R231- Read/Write Register Group: E (System) Reset value: 0000 0000 (00h)
7 C Z S V DA H 0 DP
decw), Test (tm, tmw, tcm, tcmw, btset). In most cases, the Zero flag is set when the contents of the register being used as an accumulator become zero, following one of the above operations. Bit 5 = S: Sign Flag. The Sign flag is affected by the same instructions as the Zero flag. The Sign flag is set when bit 7 (for a byte operation) or bit 15 (for a word operation) of the register used as an accumulator is one. Bit 4 = V: Overflow Flag. The Overflow flag is affected by the same instructions as the Zero and Sign flags. When set, the Overflow flag indicates that a two'scomplement number, in a result register, is in error, since it has exceeded the largest (or is less than the smallest), number that can be represented in two's-complement notation. Bit 3 = DA: Decimal Adjust Flag. The DA flag is used for BCD arithmetic. Since the algorithm for correcting BCD operations is different for addition and subtraction, this flag is used to specify which type of instruction was executed last, so that the subsequent Decimal Adjust (da) operation can perform its function correctly. The DA flag cannot normally be used as a test condition by the programmer. Bit 2 = H: Half Carry Flag. The H flag indicates a carry out of (or a borrow into) bit 3, as the result of adding or subtracting two 8-bit bytes, each representing two BCD digits. The H flag is used by the Decimal Adjust (da) instruction to convert the binary result of a previous addition or subtraction into the correct BCD result. Like the DA flag, this flag is not normally accessed by the user. Bit 1 = Reserved bit (must be 0). Bit 0 = DP: Data/Program Memory Flag. This bit indicates the memory area addressed. Its value is affected by the Set Data Memory (sdm) and Set Program Memory (spm) instructions. Refer to the Memory Management Unit for further details.
Bit 7 = C: Carry Flag. The carry flag is affected by: Addition (add, addw, adc, adcw), Subtraction (sub, subw, sbc, sbcw), Compare (cp, cpw), Shift Right Arithmetic (sra, sraw), Shift Left Arithmetic (sla, slaw), Swap Nibbles (swap), Rotate (rrc, rrcw, rlc, rlcw, ror, rol), Decimal Adjust (da), Multiply and Divide (mul, div, divws). When set, it generally indicates a carry out of the most significant bit position of the register being used as an accumulator (bit 7 for byte operations and bit 15 for word operations). The carry flag can be set by the Set Carry Flag (scf) instruction, cleared by the Reset Carry Flag (rcf) instruction, and complemented by the Complement Carry Flag (ccf) instruction. Bit 6 = Z: Zero Flag. The Zero flag is affected by: Addition (add, addw, adc, adcw), Subtraction (sub, subw, sbc, sbcw), Compare (cp, cpw), Shift Right Arithmetic (sra, sraw), Shift Left Arithmetic (sla, slaw), Swap Nibbles (swap), Rotate (rrc, rrcw, rlc, rlcw, ror, rol), Decimal Adjust (da), Multiply and Divide (mul, div, divws), Logical (and, andw, or, orw, xor, xorw, cpl), Increment and Decrement (inc, incw, dec,
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SYSTEM REGISTERS (Cont'd) If the bit is set, data is accessed using the Data Pointers (DPRs registers), otherwise it is pointed to by the Code Pointer (CSR register); therefore, the user initialization routine must include a Sdm instruction. Note that code is always pointed to by the Code Pointer (CSR). Note: In the current ST9 devices, the DP flag is only for compatibility with software developed for the first generation of ST9 devices. With the single memory addressing space, its use is now redundant. It must be kept to 1 with a Sdm instruction at the beginning of the program to ensure a normal use of the different memory pointers. 2.3.3 Register Pointing Techniques Two registers within the System register group, are used as pointers to the working registers. Register Pointer 0 (R232) may be used on its own as a single pointer to a 16-register working space, or in conjunction with Register Pointer 1 (R233), to point to two separate 8-register spaces. For the purpose of register pointing, the 16 register groups of the register file are subdivided into 32 8register blocks. The values specified with the Set Register Pointer instructions refer to the blocks to be pointed to in twin 8-register mode, or to the lower 8-register block location in single 16-register mode. The Set Register Pointer instructions srp, srp0 and srp1 automatically inform the CPU whether the Register File is to operate in single 16-register mode or in twin 8-register mode. The srp instruction selects the single 16-register group mode and specifies the location of the lower 8-register block, while the srp0 and srp1 instructions automatically select the twin 8-register group mode and specify the locations of each 8-register block. There is no limitation on the order or position of these register groups, other than that they must start on an 8-register boundary in twin 8-register mode, or on a 16-register boundary in single 16register mode. The block number should always be an even number in single 16-register mode. The 16-register group will always start at the block whose number is the nearest even number equal to or lower than the block number specified in the srp instruction. Avoid using odd block numbers, since this can be confusing if twin mode is subsequently selected. Thus: srp #3 will be interpreted as srp #2 and will allow using R16 ..R31 as r0 .. r15. In single 16-register mode, the working registers are referred to as r0 to r15. In twin 8-register mode, registers r0 to r7 are in the block pointed to by RP0 (by means of the srp0 instruction), while registers r8 to r15 are in the block pointed to by RP1 (by means of the srp1 instruction). Caution: Group D registers can only be accessed as working registers using the Register Pointers, or by means of the Stack Pointers. They cannot be addressed explicitly in the form "Rxxx".
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SYSTEM REGISTERS (Cont'd) POINTER 0 REGISTER (RP0) R232 - Read/Write Register Group: E (System) Reset Value: xxxx xx00 (xxh)
7 RG4 RG3 RG2 RG1 RG0 RPS 0 0 0
POINTER 1 REGISTER (RP1) R233 - Read/Write Register Group: E (System) Reset Value: xxxx xx00 (xxh)
7 RG4 RG3 RG2 RG1 RG0 RPS 0 0 0
Bits 7:3 = RG[4:0]: Register Group number. These bits contain the number (in the range 0 to 31) of the register block specified in the srp0 or srp instructions. In single 16-register mode the number indicates the lower of the two 8-register blocks to which the 16 working registers are to be mapped, while in twin 8-register mode it indicates the 8-register block to which r0 to r7 are to be mapped. Bit 2 = RPS: Register Pointer Selector. This bit is set by the instructions srp0 and srp1 to indicate that the twin register pointing mode is selected. The bit is reset by the srp instruction to indicate that the single register pointing mode is selected. 0: Single register pointing mode 1: Twin register pointing mode Bits 1:0: Reserved. Forced by hardware to zero.
This register is only used in the twin register pointing mode. When using the single register pointing mode, or when using only one of the twin register groups, the RP1 register must be considered as RESERVED and may NOT be used as a general purpose register. Bits 7:3 = RG[4:0]: Register Group number. These bits contain the number (in the range 0 to 31) of the 8-register block specified in the srp1 instruction, to which r8 to r15 are to be mapped. Bit 2 = RPS: Register Pointer Selector. This bit is set by the srp0 and srp1 instructions to indicate that the twin register pointing mode is selected. The bit is reset by the srp instruction to indicate that the single register pointing mode is selected. 0: Single register pointing mode 1: Twin register pointing mode Bits 1:0: Reserved. Forced by hardware to zero.
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SYSTEM REGISTERS (Cont'd) Figure 12. Pointing to a single group of 16 registers
REGISTER GROUP REGISTER FILE 31 31 F 30 29 E 28 points to: 27 D 26 25 25 addressed by BLOCK 7 9 9 4 8 7 7 3 6 5 5 2 4 r15 3 1 2 r0 1 0 0 addressed by BLOCK 2 1 0 0 GROUP 1 2 r0 3 1 r7 GROUP 1 addressed by BLOCK 2 4 2 6 3 r8 8 r15 GROUP 3 4 26 27 D REGISTER POINTER 0 set by: 30 29 E 28 F REGISTER POINTER 0 & REGISTER POINTER 1 set by:
Figure 13. Pointing to two groups of 8 registers
REGISTER GROUP REGISTER FILE
BLOCK NUMBER
BLOCK NUMBER
srp #2
instruction
srp0 #2
&
srp1 #7
instructions point to:
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SYSTEM REGISTERS (Cont'd) 2.3.4 Paged Registers Up to 64 pages, each containing 16 registers, may be mapped to Group F. These paged registers hold data and control information relating to the on-chip peripherals, each peripheral always being associated with the same pages and registers to ensure code compatibility between ST9 devices. The number of these registers depends on the peripherals present in the specific ST9 device. In other words, pages only exist if the relevant peripheral is present. The paged registers are addressed using the normal register addressing modes, in conjunction with the Page Pointer register, R234, which is one of the System registers. This register selects the page to be mapped to Group F and, once set, does not need to be changed if two or more registers on the same page are to be addressed in succession. Thus the instructions: spp #5 ld R242, r4 will load the contents of working register r4 into the third register of page 5 (R242). Warning: During an interrupt, the PPR register is not saved automatically in the stack. If needed, it should be saved/restored by the user within the interrupt routine. PAGE POINTER REGISTER (PPR) R234 - Read/Write Register Group: E (System) Reset value: xxxx xx00 (xxh)
7 PP5 PP4 PP3 PP2 PP1 PP0 0 0 0
need to refresh it unless a different page is required. Bits 1:0: Reserved. Forced by hardware to 0. 2.3.5 Mode Register The Mode Register allows control of the following operating parameters: - Selection of internal or external System and User Stack areas, - Management of the clock frequency, - Enabling of Bus request and Wait signals when interfacing to external memory. MODE REGISTER (MODER) R235 - Read/Write Register Group: E (System) Reset value: 1110 0000 (E0h)
7
SSP USP DIV2 PRS2 PRS1
0
PRS0 BRQEN HIMP
Bit 7 = SSP: System Stack Pointer. This bit selects an internal or external System Stack area. 0: External system stack area, in memory space. 1: Internal system stack area, in the Register File (reset state). Bit 6 = USP: User Stack Pointer. This bit selects an internal or external User Stack area. 0: External user stack area, in memory space. 1: Internal user stack area, in the Register File (reset state). Bit 5 = DIV2: Crystal Oscillator Clock Divided by 2. This bit controls the divide-by-2 circuit operating on the crystal oscillator clock (CLOCK1). 0: Clock divided by 1 1: Clock divided by 2
Bits 7:2 = PP[5:0]: Page Pointer. These bits contain the number (in the range 0 to 63) of the page specified in the spp instruction. Once the page pointer has been set, there is no
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Bits 4:2 = PRS[2:0]: CPUCLK Prescaler. These bits load the prescaler division factor for the internal clock (INTCLK). The prescaler factor selects the internal clock frequency, which can be divided by a factor from 1 to 8. Refer to the Reset and Clock Control chapter for further information. Bit 1 = BRQEN: Bus Request Enable. 0: External Memory Bus Request disabled 1: External Memory Bus Request enabled on BREQ pin (where available). Note: Disregard this bit if BREQ pin is not available. Bit 0 = HIMP: High Impedance Enable. When any of Ports 0, 1, 2 or 6 depending on device configuration, are programmed as Address and Data lines to interface external Memory, these lines and the Memory interface control lines (AS, DS, R/W) can be forced into the High Impedance
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SYSTEM REGISTERS (Cont'd) state by setting the HIMP bit. When this bit is reset, it has no effect. Setting the HIMP bit is recommended for noise reduction when only internal Memory is used. If Port 1 and/or 2 are declared as an address AND as an I/O port (for example: P10... P14 = Address, and P15... P17 = I/O), the HIMP bit has no effect on the I/O lines. 2.3.6 Stack Pointers Two separate, double-register stack pointers are available: the System Stack Pointer and the User Stack Pointer, both of which can address registers or memory. The stack pointers point to the "bottom" of the stacks which are filled using the push commands and emptied using the pop commands. The stack pointer is automatically pre-decremented when data is "pushed" in and post-incremented when data is "popped" out. The push and pop commands used to manage the System Stack may be addressed to the User Stack by adding the suffix "u". To use a stack instruction for a word, the suffix "w" is added. These suffixes may be combined. When bytes (or words) are "popped" out from a stack, the contents of the stack locations are unchanged until fresh data is loaded. Thus, when data is "popped" from a stack area, the stack contents remain unchanged. Note: Instructions such as: pushuw RR236 or pushw RR238, as well as the corresponding pop instructions (where R236 & R237, and R238 & R239 are themselves the user and system stack pointers respectively), must not be used, since the pointer values are themselves automatically changed by the push or pop instruction, thus corrupting their value. System Stack The System Stack is used for the temporary storage of system and/or control data, such as the Flag register and the Program counter. The following automatically push data onto the System Stack: - Interrupts When entering an interrupt, the PC and the Flag Register are pushed onto the System Stack. If the ENCSR bit in the EMR2 register is set, then the Code Segment Register is also pushed onto the System Stack. - Subroutine Calls When a call instruction is executed, only the PC is pushed onto stack, whereas when a calls instruction (call segment) is executed, both the PC and the Code Segment Register are pushed onto the System Stack. - Link Instruction The link or linku instructions create a C language stack frame of user-defined length in the System or User Stack. All of the above conditions are associated with their counterparts, such as return instructions, which pop the stored data items off the stack. User Stack The User Stack provides a totally user-controlled stacking area. The User Stack Pointer consists of two registers, R236 and R237, which are both used for addressing a stack in memory. When stacking in the Register File, the User Stack Pointer High Register, R236, becomes redundant but must be considered as reserved. Stack Pointers Both System and User stacks are pointed to by double-byte stack pointers. Stacks may be set up in RAM or in the Register File. Only the lower byte will be required if the stack is in the Register File. The upper byte must then be considered as reserved and must not be used as a general purpose register. The stack pointer registers are located in the System Group of the Register File, this is illustrated in Table 2 System Registers (Group E). Stack Location Care is necessary when managing stacks as there is no limit to stack sizes apart from the bottom of any address space in which the stack is placed. Consequently programmers are advised to use a stack pointer value as high as possible, particularly when using the Register File as a stacking area. Group D is a good location for a stack in the Register File, since it is the highest available area. The stacks may be located anywhere in the first 14 groups of the Register File (internal stacks) or in RAM (external stacks). Note. Stacks must not be located in the Paged Register Group or in the System Register Group.
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SYSTEM REGISTERS (Cont'd) USER STACK POINTER HIGH REGISTER (USPHR) R236 - Read/Write Register Group: E (System) Reset value: undefined
7 USP15 USP14 USP13 USP12 USP11 USP10 USP9 0 USP8
SYSTEM STACK POINTER HIGH REGISTER (SSPHR) R238 - Read/Write Register Group: E (System) Reset value: undefined
7 SSP15 SSP14 SSP13 SSP12 SSP11 SSP10 SSP9 0 SSP8
USER STACK POINTER LOW REGISTER (USPLR) R237 - Read/Write Register Group: E (System) Reset value: undefined
7 USP7 USP6 USP5 USP4 USP3 USP2 USP1 0 USP0
SYSTEM STACK POINTER LOW REGISTER (SSPLR) R239 - Read/Write Register Group: E (System) Reset value: undefined
7 SSP7 SSP6 SSP5 SSP4 SSP3 SSP2 SSP1 0 SSP0
Figure 14. Internal Stack Mode
Figure 15. External Stack Mode
REGISTER FILE STACK POINTER (LOW) F points to: F
REGISTER FILE
STACK POINTER (LOW) & STACK POINTER (HIGH) point to: MEMORY
E STACK D
E
D
STACK 4 4
3
3
2
2
1
1
0
0
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2.4 MEMORY ORGANIZATION Code and data are accessed within the same linear address space. All of the physically separate memory areas, including the internal ROM, internal RAM and external memory are mapped in a common address space. The ST9 provides a total addressable memory space of 4 Mbytes. This address space is arranged as 64 segments of 64 Kbytes; each segment is again subdivided into four 16 Kbyte pages. The mapping of the various memory areas (internal RAM or ROM, external memory) differs from device to device. Each 64-Kbyte physical memory segment is mapped either internally or externally; if the memory is internal and smaller than 64 Kbytes, the remaining locations in the 64-Kbyte segment are not used (reserved). Refer to the Register and Memory Map Chapter for more details on the memory map.
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2.5 MEMORY MANAGEMENT UNIT The CPU Core includes a Memory Management Unit (MMU) which must be programmed to perform memory accesses (even if external memory is not used). The MMU is controlled by 7 registers and 2 bits (ENCSR and DPRREM) present in EMR2, which may be written and read by the user program. These registers are mapped within group F, Page 21 of the Register File. The 7 registers may be Figure 16. Page 21 Registers sub-divided into 2 main groups: a first group of four 8-bit registers (DPR[3:0]), and a second group of three 6-bit registers (CSR, ISR, and DMASR). The first group is used to extend the address during Data Memory access (DPR[3:0]). The second is used to manage Program and Data Memory accesses during Code execution (CSR), Interrupts Service Routines (ISR or CSR), and DMA transfers (DMASR or ISR).
Page 21 FFh FEh FDh FCh FBh FAh F9h F8h F7h F6h F5h F4h F3h F2h F1h F0h EMR2 EMR1 CSR DPR3 DPR2 DPR1 DPR0 DMASR ISR R255 R254 R253 R252 R251 R250 R249 R248 R247 R246 R245 R244 R243 R242 R241 R240 MMU EM MMU MMU SSPLR SSPHR USPLR USPHR MODER PPR RP1 RP0 FLAGR CICR P5DR P4DR P3DR P2DR P1DR P0DR SSPLR SSPHR USPLR USPHR MODER PPR RP1 RP0 FLAGR CICR P5DR P4DR DPR3 DPR2 DPR1 DPR0
Relocation of P[3:0] and DPR[3:0] Registers
DMASR ISR EMR2 EMR1 CSR DPR3 DPR2 1 DPR0
DMASR ISR EMR2 EMR1 CSR P3DR P2DR P1DR P0DR
Bit DPRREM=0 (default setting)
Bit DPRREM=1
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2.6 ADDRESS SPACE EXTENSION To manage 4 Mbytes of addressing space, it is necessary to have 22 address bits. The MMU adds 6 bits to the usual 16-bit address, thus translating a 16-bit virtual address into a 22-bit physical address. There are 2 different ways to do this depending on the memory involved and on the operation being performed. 2.6.1 Addressing 16-Kbyte Pages This extension mode is implicitly used to address Data memory space if no DMA is being performed. The Data memory space is divided into 4 pages of 16 Kbytes. Each one of the four 8-bit registers (DPR[3:0], Data Page Registers) selects a different 16-Kbyte page. The DPR registers allow access to the entire memory space which contains 256 pages of 16 Kbytes. Data paging is performed by extending the 14 LSB of the 16-bit address with the contents of a DPR register. The two MSBs of the 16-bit address are interpreted as the identification number of the DPR register to be used. Therefore, the DPR registers Figure 17. Addressing via DPR[3:0] are involved in the following virtual address ranges: DPR0: from 0000h to 3FFFh; DPR1: from 4000h to 7FFFh; DPR2: from 8000h to BFFFh; DPR3: from C000h to FFFFh. The contents of the selected DPR register specify one of the 256 possible data memory pages. This 8-bit data page number, in addition to the remaining 14-bit page offset address forms the physical 22-bit address (see Figure 10). A DPR register cannot be modified via an addressing mode that uses the same DPR register. For instance, the instruction "POPW DPR0" is legal only if the stack is kept either in the register file or in a memory location above 8000h, where DPR2 and DPR3 are used. Otherwise, since DPR0 and DPR1 are modified by the instruction, unpredictable behaviour could result.
MMU registers DPR0 DPR1 DPR2 DPR3
16-bit virtual address
00
01
10
11
2M
SB
8 bits
14 LSB
22-bit physical address
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ADDRESS SPACE EXTENSION (Cont'd) 2.6.2 Addressing 64-Kbyte Segments This extension mode is used to address Data memory space during a DMA and Program memory space during any code execution (normal code and interrupt routines). Three registers are used: CSR, ISR, and DMASR. The 6-bit contents of one of the registers CSR, ISR, or DMASR define one out of 64 Memory segments of 64 Kbytes within the 4 Mbytes address space. The register contents represent the 6 MSBs of the memory address, whereas the 16 LSBs of the address (intra-segment address) are given by the virtual 16-bit address (see Figure 11). 2.7 MMU REGISTERS The MMU uses 7 registers mapped into Group F, Page 21 of the Register File and 2 bits of the EMR2 register. Most of these registers do not have a default value after reset. 2.7.1 DPR[3:0]: Data Page Registers The DPR[3:0] registers allow access to the entire 4 Mbyte memory space composed of 256 pages of 16 Kbytes. 2.7.1.1 Data Page Register Relocation If these registers are to be used frequently, they may be relocated in register group E, by programming bit 5 of the EMR2-R246 register in page 21. If this bit is set, the DPR[3:0] registers are located at R224-227 in place of the Port 0-3 Data Registers, which are re-mapped to the default DPR's locations: R240-243 page 21. Data Page Register relocation is illustrated in Figure 9.
Figure 18. Addressing via CSR, ISR, and DMASR
MMU registers CSR DMASR ISR
16-bit virtual address
1 1 2 Fetching program instruction Data Memory accessed in DMA Fetching interrupt instruction or DMA access to Program Memory
2
3
6 bits
3
22-bit physical address
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MMU REGISTERS (Cont'd) DATA PAGE REGISTER 0 (DPR0) R240 - Read/Write Register Page: 21 Reset value: undefined This register is relocated to R224 if EMR2.5 is set.
7 0
DATA PAGE REGISTER 2 (DPR2) R242 - Read/Write Register Page: 21 Reset value: undefined This register is relocated to R226 if EMR2.5 is set.
7 0
DPR0_7 DPR0_6 DPR0_5 DPR0_4 DPR0_3 DPR0_2 DPR0_1 DPR0_0
DPR2_7 DPR2_6 DPR2_5 DPR2_4 DPR2_3 DPR2_2 DPR2_1 DPR2_0
Bits 7:0 = DPR0_[7:0]: These bits define the 16Kbyte Data Memory page number. They are used as the most significant address bits (A21-14) to extend the address during a Data Memory access. The DPR0 register is used when addressing the virtual address range 0000h-3FFFh. DATA PAGE REGISTER 1 (DPR1) R241 - Read/Write Register Page: 21 Reset value: undefined This register is relocated to R225 if EMR2.5 is set.
7 0
Bits 7:0 = DPR2_[7:0]: These bits define the 16Kbyte Data memory page. They are used as the most significant address bits (A21-14) to extend the address during a Data memory access. The DPR2 register is involved when the virtual address is in the range 8000h-BFFFh. DATA PAGE REGISTER 3 (DPR3) R243 - Read/Write Register Page: 21 Reset value: undefined This register is relocated to R227 if EMR2.5 is set.
7 0
DPR1_7 DPR1_6 DPR1_5 DPR1_4 DPR1_3 DPR1_2 DPR1_1 DPR1_0
DPR3_7 DPR3_6 DPR3_5 DPR3_4 DPR3_3 DPR3_2 DPR3_1 DPR3_0
Bits 7:0 = DPR1_[7:0]: These bits define the 16Kbyte Data Memory page number. They are used as the most significant address bits (A21-14) to extend the address during a Data Memory access. The DPR1 register is used when addressing the virtual address range 4000h-7FFFh.
Bits 7:0 = DPR3_[7:0]: These bits define the 16Kbyte Data memory page. They are used as the most significant address bits (A21-14) to extend the address during a Data memory access. The DPR3 register is involved when the virtual address is in the range C000h-FFFFh.
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MMU REGISTERS (Cont'd) 2.7.2 CSR: Code Segment Register This register selects the 64-Kbyte code segment being used at run-time to access instructions. It can also be used to access data if the spm instruction has been executed (or ldpp, ldpd, lddp). Only the 6 LSBs of the CSR register are implemented, and bits 6 and 7 are reserved. The CSR register allows access to the entire memory space, divided into 64 segments of 64 Kbytes. To generate the 22-bit Program memory address, the contents of the CSR register is directly used as the 6 MSBs, and the 16-bit virtual address as the 16 LSBs. Note: The CSR register should only be read and not written for data operations (there are some exceptions which are documented in the following paragraph). It is, however, modified either directly by means of the jps and calls instructions, or indirectly via the stack, by means of the rets instruction. CODE SEGMENT REGISTER (CSR) R244 - Read/Write Register Page: 21 Reset value: 0000 0000 (00h)
7 0 0 CSR_5 CSR_4 CSR_3 CSR_2 CSR_1 0 CSR_0
ISR and ENCSR bit (EMR2 register) are also described in the chapter relating to Interrupts, please refer to this description for further details. Bits 7:6 = Reserved, keep in reset state. Bits 5:0 = ISR_[5:0]: These bits define the 64Kbyte memory segment (among 64) which contains the interrupt vector table and the code for interrupt service routines and DMA transfers (when the PS bit of the DAPR register is reset). These bits are used as the most significant address bits (A21-16). The ISR is used to extend the address space in two cases: - Whenever an interrupt occurs: ISR points to the 64-Kbyte memory segment containing the interrupt vector table and the interrupt service routine code. See also the Interrupts chapter. - During DMA transactions between the peripheral and memory when the PS bit of the DAPR register is reset : ISR points to the 64 K-byte Memory segment that will be involved in the DMA transaction. 2.7.4 DMASR: DMA Segment Register DMA SEGMENT REGISTER (DMASR) R249 - Read/Write Register Page: 21 Reset value: undefined
7 DMA SR_5 DMA SR_4 DMA SR_3 DMA SR_2 DMA SR_1 0 DMA SR_0
Bits 7:6 = Reserved, keep in reset state. Bits 5:0 = CSR_[5:0]: These bits define the 64Kbyte memory segment (among 64) which contains the code being executed. These bits are used as the most significant address bits (A21-16). 2.7.3 ISR: Interrupt Segment Register INTERRUPT SEGMENT REGISTER (ISR) R248 - Read/Write Register Page: 21 Reset value: undefined
7 0 0 0 ISR_5 ISR_4 ISR_3 ISR_2 ISR_1 ISR_0
0
0
Bits 7:6 = Reserved, keep in reset state. Bits 5:0 = DMASR_[5:0]: These bits define the 64Kbyte Memory segment (among 64) used when a DMA transaction is performed between the peripheral's data register and Memory, with the PS bit of the DAPR register set. These bits are used as the most significant address bits (A21-16). If the PS bit is reset, the ISR register is used to extend the address.
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MMU REGISTERS (Cont'd) Figure 19. Memory Addressing Scheme (example)
4M bytes
3FFFFFh
16K
294000h
DPR3 DPR2 DPR1 DPR0 16K 16K 20C000h 200000h 1FFFFFh 240000h 23FFFFh
64K DMASR
040000h 03FFFFh 030000h 020000h
ISR CSR
64K 16K 64K
010000h 00C000h 000000h
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2.8 MMU USAGE 2.8.1 Normal Program Execution Program memory is organized as a set of 64Kbyte segments. The program can span as many segments as needed, but a procedure cannot stretch across segment boundaries. jps, calls and rets instructions, which automatically modify the CSR, must be used to jump across segment boundaries. Writing to the CSR is forbidden during normal program execution because it is not synchronized with the opcode fetch. This could result in fetching the first byte of an instruction from one memory segment and the second byte from another. Writing to the CSR is allowed when it is not being used, i.e during an interrupt service routine if ENCSR is reset. Note that a routine must always be called in the same way, i.e. either always with call or always with calls, depending on whether the routine ends with ret or rets. This means that if the routine is written without prior knowledge of the location of other routines which call it, and all the program code does not fit into a single 64-Kbyte segment, then calls/rets should be used. In typical microcontroller applications, less than 64 Kbytes of RAM are used, so the four Data space pages are normally sufficient, and no change of DPR[3:0] is needed during Program execution. It may be useful however to map part of the ROM into the data space if it contains strings, tables, bit maps, etc. If there is to be frequent use of paging, the user can set bit 5 (DPRREM) in register R246 (EMR2) of Page 21. This swaps the location of registers DPR[3:0] with that of the data registers of Ports 03. In this way, DPR registers can be accessed without the need to save/set/restore the Page Pointer Register. Port registers are therefore moved to page 21. Applications that require a lot of paging typically use more than 64 Kbytes of external memory, and as ports 0, 1 and 2 are required to address it, their data registers are unused. 2.8.2 Interrupts The ISR register has been created so that the interrupt routines may be found by means of the same vector table even after a segment jump/call. When an interrupt occurs, the CPU behaves in one of 2 ways, depending on the value of the ENCSR bit in the EMR2 register (R246 on Page 21). If this bit is reset (default condition), the CPU works in original ST9 compatibility mode. For the duration of the interrupt service routine, the ISR is used instead of the CSR, and the interrupt stack frame is kept exactly as in the original ST9 (only the PC and flags are pushed). This avoids the need to save the CSR on the stack in the case of an interrupt, ensuring a fast interrupt response time. The drawback is that it is not possible for an interrupt service routine to perform segment calls/jps: these instructions would update the CSR, which, in this case, is not used (ISR is used instead). The code size of all interrupt service routines is thus limited to 64 Kbytes. If, instead, bit 6 of the EMR2 register is set, the ISR is used only to point to the interrupt vector table and to initialize the CSR at the beginning of the interrupt service routine: the old CSR is pushed onto the stack together with the PC and the flags, and then the CSR is loaded with the ISR. In this case, an iret will also restore the CSR from the stack. This approach lets interrupt service routines access the whole 4-Mbyte address space. The drawback is that the interrupt response time is slightly increased, because of the need to also save the CSR on the stack. Compatibility with the original ST9 is also lost in this case, because the interrupt stack frame is different; this difference, however, would not be noticeable for a vast majority of programs. Data memory mapping is independent of the value of bit 6 of the EMR2 register, and remains the same as for normal code execution: the stack is the same as that used by the main program, as in the ST9. If the interrupt service routine needs to access additional Data memory, it must save one (or more) of the DPRs, load it with the needed memory page and restore it before completion. 2.8.3 DMA Depending on the PS bit in the DAPR register (see DMA chapter) DMA uses either the ISR or the DMASR for memory accesses: this guarantees that a DMA will always find its memory segment(s), no matter what segment changes the application has performed. Unlike interrupts, DMA transactions cannot save/restore paging registers, so a dedicated segment register (DMASR) has been created. Having only one register of this kind means that all DMA accesses should be programmed in one of the two following segments: the one pointed to by the ISR (when the PS bit of the DAPR register is reset), and the one referenced by the DMASR (when the PS bit is set).
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3 INTERRUPTS
3.1 INTRODUCTION The ST9 responds to peripheral and external events through its interrupt channels. Current program execution can be suspended to allow the ST9 to execute a specific response routine when such an event occurs, providing that interrupts have been enabled, and according to a priority mechanism. If an event generates a valid interrupt request, the current program status is saved and control passes to the appropriate Interrupt Service Routine. The ST9 CPU can receive requests from the following sources: - On-chip peripherals - External pins - Top-Level Pseudo-non-maskable interrupt According to the on-chip peripheral features, an event occurrence can generate an Interrupt request which depends on the selected mode. Up to eight external interrupt channels, with programmable input trigger edge, are available. In addition, a dedicated interrupt channel, set to the Top-level priority, can be devoted either to the external NMI pin (where available) to provide a NonMaskable Interrupt, or to the Timer/Watchdog. Interrupt service routines are addressed through a vector table mapped in Memory. Figure 20. Interrupt Response
n
3.2 INTERRUPT VECTORING The ST9 implements an interrupt vectoring structure which allows the on-chip peripheral to identify the location of the first instruction of the Interrupt Service Routine automatically. When an interrupt request is acknowledged, the peripheral interrupt module provides, through its Interrupt Vector Register (IVR), a vector to point into the vector table of locations containing the start addresses of the Interrupt Service Routines (defined by the programmer). Each peripheral has a specific IVR mapped within its Register File pages. The Interrupt Vector table, containing the addresses of the Interrupt Service Routines, is located in the first 256 locations of Memory pointed to by the ISR register, thus allowing 8-bit vector addressing. For a description of the ISR register refer to the chapter describing the MMU. The user Power on Reset vector is stored in the first two physical bytes in memory, 000000h and 000001h. The Top Level Interrupt vector is located at addresses 0004h and 0005h in the segment pointed to by the Interrupt Segment Register (ISR). With one Interrupt Vector register, it is possible to address several interrupt service routines; in fact, peripherals can share the same interrupt vector register among several interrupt channels. The most significant bits of the vector are user programmable to define the base vector address within the vector table, the least significant bits are controlled by the interrupt module, in hardware, to select the appropriate vector. Note: The first 256 locations of the memory segment pointed to by ISR can contain program code. 3.2.1 Divide by Zero trap The Divide by Zero trap vector is located at addresses 0002h and 0003h of each code segment; it should be noted that for each code segment a Divide by Zero service routine is required. Warning. Although the Divide by Zero Trap operates as an interrupt, the FLAG Register is not pushed onto the system Stack automatically. As a result it must be regarded as a subroutine, and the service routine must end with the RET instruction (not IRET ).
NORMAL PROGRAM FLOW
INTERRUPT SERVICE ROUTINE
INTERRUPT
CLEAR PENDING BIT
IRET INSTRUCTION
VR001833
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INTERRUPT VECTORING (Cont'd) 3.2.2 Segment Paging During Interrupt Routines The ENCSR bit in the EMR2 register can be used to select between original ST9 backward compatibility mode and ST9+ interrupt management mode. ST9 backward compatibility mode (ENCSR = 0) If ENCSR is reset, the CPU works in original ST9 compatibility mode. For the duration of the interrupt service routine, ISR is used instead of CSR, and the interrupt stack frame is identical to that of the original ST9: only the PC and Flags are pushed. This avoids saving the CSR on the stack in the event of an interrupt, thus ensuring a faster interrupt response time. It is not possible for an interrupt service routine to perform inter-segment calls or jumps: these instructions would update the CSR, which, in this case, is not used (ISR is used instead). The code segment size for all interrupt service routines is thus limited to 64K bytes. ST9+ mode (ENCSR = 1) If ENCSR is set, ISR is only used to point to the interrupt vector table and to initialize the CSR at the beginning of the interrupt service routine: the old CSR is pushed onto the stack together with the PC and flags, and CSR is then loaded with the contents of ISR. In this case, iret will also restore CSR from the stack. This approach allows interrupt service routines to access the entire 4 Mbytes of address space. The drawback is that the interrupt response time is slightly increased, because of the need to also save CSR on the stack. Full compatibility with the original ST9 is lost in this case, because the interrupt stack frame is different.
ENCSR Bit 0 1 Mode ST9 Compatible ST9+ Pushed/Popped PC, FLAGR, PC, FLAGR Registers CSR Max. Code Size 64KB No limit for interrupt Within 1 segment Across segments service routine
3.3 INTERRUPT PRIORITY LEVELS The ST9 supports a fully programmable interrupt priority structure. Nine priority levels are available to define the channel priority relationships: - The on-chip peripheral channels and the eight external interrupt sources can be programmed within eight priority levels. Each channel has a 3bit field, PRL (Priority Level), that defines its priority level in the range from 0 (highest priority) to 7 (lowest priority). - The 9th level (Top Level Priority) is reserved for the Timer/Watchdog or the External Pseudo Non-Maskable Interrupt. An Interrupt service routine at this level cannot be interrupted in any arbitration mode. Its mask can be both maskable (TLI) or non-maskable (TLNM). 3.4 PRIORITY LEVEL ARBITRATION The 3 bits of CPL (Current Priority Level) in the Central Interrupt Control Register contain the priority of the currently running program (CPU priority). CPL is set to 7 (lowest priority) upon reset and can be modified during program execution either by software or automatically by hardware according to the selected Arbitration Mode. During every instruction, an arbitration phase takes place, during which, for every channel capable of generating an Interrupt, each priority level is compared to all the other requests (interrupts or DMA). If the highest priority request is an interrupt, its PRL value must be strictly lower (that is, higher priority) than the CPL value stored in the CICR register (R230) in order to be acknowledged. The Top Level Interrupt overrides every other priority. 3.4.1 Priority level 7 (Lowest) Interrupt requests at PRL level 7 cannot be acknowledged, as this PRL value (the lowest possible priority) cannot be strictly lower than the CPL value. This can be of use in a fully polled interrupt environment. 3.4.2 Maximum depth of nesting No more than 8 routines can be nested. If an interrupt routine at level N is being serviced, no other Interrupts located at level N can interrupt it. This guarantees a maximum number of 8 nested levels including the Top Level Interrupt request.
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PRIORITY LEVEL ARBITRATION (Cont'd) 3.4.3 Simultaneous Interrupts If two or more requests occur at the same time and at the same priority level, an on-chip daisy chain, specific to every ST9 version, selects the channel with the highest position in the chain, as shown in Table 5. Table 5. Daisy Chain Priority for the ST92185B
Highest Position INTA0 INTA1 INTB0 INTB1 INTC0 INTC1 INTD0 INTD1 INT0/WDT INT1/Standard Timer INT2/SPI INT3/AD Converter INT4/SYNC (EOFVBI) INT5/SYNC (FLDST) INT6 INT7
Lowest Position
3.4.4 Dynamic Priority Level Modification The main program and routines can be specifically prioritized. Since the CPL is represented by 3 bits in a read/write register, it is possible to modify dynamically the current priority value during program execution. This means that a critical section can have a higher priority with respect to other interrupt requests. Furthermore it is possible to prioritize even the Main Program execution by modifying the CPL during its execution. See Figure 21 Figure 21. Example of Dynamic priority level modification in Nested Mode
INTERRUPT 6 HAS PRIORITY LEVEL 6 Priority Level CPL is set to 7 4 by MAIN program ei INT6 MAIN CPL is set to 5 CPL6 > CPL5: 6 INT6 pending 7 5
INT 6 CPL=6 MAIN CPL=7
3.5 ARBITRATION MODES The ST9 provides two interrupt arbitration modes: Concurrent mode and Nested mode. Concurrent mode is the standard interrupt arbitration mode. Nested mode improves the effective interrupt response time when service routine nesting is required, depending on the request priority levels.
The IAM control bit in the CICR Register selects Concurrent Arbitration mode or Nested Arbitration Mode. 3.5.1 Concurrent Mode This mode is selected when the IAM bit is cleared (reset condition). The arbitration phase, performed during every instruction, selects the request with the highest priority level. The CPL value is not modified in this mode. Start of Interrupt Routine The interrupt cycle performs the following steps: - All maskable interrupt requests are disabled by clearing CICR.IEN. - The PC low byte is pushed onto system stack. - The PC high byte is pushed onto system stack. - If ENCSR is set, CSR is pushed onto system stack. - The Flag register is pushed onto system stack. - The PC is loaded with the 16-bit vector stored in the Vector Table, pointed to by the IVR. - If ENCSR is set, CSR is loaded with ISR contents; otherwise ISR is used in place of CSR until iret instruction. End of Interrupt Routine The Interrupt Service Routine must be ended with the iret instruction. The iret instruction executes the following operations: - The Flag register is popped from system stack. - If ENCSR is set, CSR is popped from system stack. - The PC high byte is popped from system stack. - The PC low byte is popped from system stack. - All unmasked Interrupts are enabled by setting the CICR.IEN bit. - If ENCSR is reset, CSR is used instead of ISR. Normal program execution thus resumes at the interrupted instruction. All pending interrupts remain pending until the next ei instruction (even if it is executed during the interrupt service routine). Note: In Concurrent mode, the source priority level is only useful during the arbitration phase, where it is compared with all other priority levels and with the CPL. No trace is kept of its value during the ISR. If other requests are issued during the interrupt service routine, once the global CICR.IEN is re-enabled, they will be acknowledged regardless of the interrupt service routine's priority. This may cause undesirable interrupt response sequences.
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ARBITRATION MODES (Cont'd) Examples In the following two examples, three interrupt requests with different priority levels (2, 3 & 4) occur simultaneously during the interrupt 5 service routine. Example 1 In the first example, (simplest case, Figure 22) the ei instruction is not used within the interrupt service routines. This means that no new interrupt can be serviced in the middle of the current one. The interrupt routines will thus be serviced one after another, in the order of their priority, until the main program eventually resumes.
Figure 22. Simple Example of a Sequence of Interrupt Requests with: - Concurrent mode selected and - IEN unchanged by the interrupt routines
0 Priority Level of Interrupt Request
INTERRUPT 2 HAS PRIORITY LEVEL 2 INTERRUPT 3 HAS PRIORITY LEVEL 3 INTERRUPT 4 HAS PRIORITY LEVEL 4 INTERRUPT 5 HAS PRIORITY LEVEL 5
1
2
INT 2 CPL = 7 INT 3 CPL = 7 INT 2 INT 3 INT 4 INT 5 ei CPL = 7 INT 4 CPL = 7
3
4
5
6 INT 5 7 MAIN CPL is set to 7 MAIN CPL = 7
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ARBITRATION MODES (Cont'd) Example 2 In the second example, (more complex, Figure 23), each interrupt service routine sets Interrupt Enable with the ei instruction at the beginning of the routine. Placed here, it minimizes response time for requests with a higher priority than the one being serviced. The level 2 interrupt routine (with the highest priority) will be acknowledged first, then, when the ei instruction is executed, it will be interrupted by the level 3 interrupt routine, which itself will be interrupted by the level 4 interrupt routine. When the level 4 interrupt routine is completed, the level 3 interrupt routine resumes and finally the level 2 interrupt routine. This results in the three interrupt serv-
ice routines being executed in the opposite order of their priority. It is therefore recommended to avoid inserting the ei instruction in the interrupt service routine in Concurrent mode. Use the ei instruction only in nested mode. WARNING: If, in Concurrent Mode, interrupts are nested (by executing ei in an interrupt service routine), make sure that either ENCSR is set or CSR=ISR, otherwise the iret of the innermost interrupt will make the CPU use CSR instead of ISR before the outermost interrupt service routine is terminated, thus making the outermost routine fail.
Figure 23. Complex Example of a Sequence of Interrupt Requests with: - Concurrent mode selected - IEN set to 1 during interrupt service routine execution
0 Priority Level of Interrupt Request
INTERRUPT 2 HAS PRIORITY LEVEL 2 INTERRUPT 3 HAS PRIORITY LEVEL 3 INTERRUPT 4 HAS PRIORITY LEVEL 4 INTERRUPT 5 HAS PRIORITY LEVEL 5
1
2
INT 2 CPL = 7
INT 2 CPL = 7 INT 3 CPL = 7 ei INT 4 CPL = 7 INT 5 CPL = 7 INT 3 CPL = 7
3 INT 2 INT 3 INT 4 INT 5 ei 6 INT 5 7 MAIN CPL is set to 7 CPL = 7 ei
ei
4
5
ei
MAIN CPL = 7
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ARBITRATION MODES (Cont'd) 3.5.2 Nested Mode The difference between Nested mode and Concurrent mode, lies in the modification of the Current Priority Level (CPL) during interrupt processing. The arbitration phase is basically identical to Concurrent mode, however, once the request is acknowledged, the CPL is saved in the Nested Interrupt Control Register (NICR) by setting the NICR bit corresponding to the CPL value (i.e. if the CPL is 3, the bit 3 will be set). The CPL is then loaded with the priority of the request just acknowledged; the next arbitration cycle is thus performed with reference to the priority of the interrupt service routine currently being executed. Start of Interrupt Routine The interrupt cycle performs the following steps: - All maskable interrupt requests are disabled by clearing CICR.IEN. - CPL is saved in the special NICR stack to hold the priority level of the suspended routine. - Priority level of the acknowledged routine is stored in CPL, so that the next request priority will be compared with the one of the routine currently being serviced. - The PC low byte is pushed onto system stack. - The PC high byte is pushed onto system stack. - If ENCSR is set, CSR is pushed onto system stack. - The Flag register is pushed onto system stack. - The PC is loaded with the 16-bit vector stored in the Vector Table, pointed to by the IVR. - If ENCSR is set, CSR is loaded with ISR contents; otherwise ISR is used in place of CSR until iret instruction.
Figure 24. Simple Example of a Sequence of Interrupt Requests with: - Nested mode - IEN unchanged by the interrupt routines
Priority Level of Interrupt Request 0 INT 0 CPL=0 CPL6 > CPL3: INT6 pending
INTERRUPT 0 HAS PRIORITY LEVEL 0 INTERRUPT 2 HAS PRIORITY LEVEL 2 INTERRUPT 3 HAS PRIORITY LEVEL 3 INTERRUPT 4 HAS PRIORITY LEVEL 4 INTERRUPT 5 HAS PRIORITY LEVEL 5 INTERRUPT 6 HAS PRIORITY LEVEL 6
1 INT0 2 INT 2 CPL=2
INT6 INT 3 CPL=3
INT 2 CPL=2
3 INT2 INT3 INT4 INT 5 CPL=5
INT2 INT 4 CPL=4
4
5 ei 6 INT5 7
CPL2 < CPL4: Serviced next
INT 6 CPL=6 MAIN CPL=7
MAIN CPL is set to 7
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ARBITRATION MODES (Cont'd) End of Interrupt Routine The iret Interrupt Return instruction executes the following steps: - The Flag register is popped from system stack. - If ENCSR is set, CSR is popped from system stack. - The PC high byte is popped from system stack. - The PC low byte is popped from system stack. - All unmasked Interrupts are enabled by setting the CICR.IEN bit. - The priority level of the interrupted routine is popped from the special register (NICR) and copied into CPL. - If ENCSR is reset, CSR is used instead of ISR, unless the program returns to another nested routine. The suspended routine thus resumes at the interrupted instruction. Figure 24 contains a simple example, showing that if the ei instruction is not used in the interrupt service routines, nested and concurrent modes are equivalent. Figure 25 contains a more complex example showing how nested mode allows nested interrupt processing (enabled inside the interrupt service routinesi using the ei instruction) according to their priority level.
Figure 25. Complex Example of a Sequence of Interrupt Requests with: - Nested mode - IEN set to 1 during the interrupt routine execution
Priority Level of Interrupt Request 0
INTERRUPT 0 HAS PRIORITY LEVEL 0 INTERRUPT 2 HAS PRIORITY LEVEL 2
INT 0 CPL=0 CPL6 > CPL3: INT6 pending INT 2 CPL=2 INT 2 CPL=2
INTERRUPT 3 HAS PRIORITY LEVEL 3 INTERRUPT 4 HAS PRIORITY LEVEL 4 INTERRUPT 5 HAS PRIORITY LEVEL 5 INTERRUPT 6 HAS PRIORITY LEVEL 6
1 INT0 2 INT 2 CPL=2 ei INT2 INT3 INT4 INT 5 CPL=5 ei ei INT5 7 MAIN CPL is set to 7
INT6 INT 3 CPL=3 INT2
3
4
ei CPL2 < CPL4: Serviced just after ei INT 4 CPL=4 ei INT 4 CPL=4 INT 5 CPL=5 INT 6 CPL=6 MAIN CPL=7
5
6
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3.6 EXTERNAL INTERRUPTS The standard ST9 core contains 8 external interrupts sources grouped into four pairs. Table 6. External Interrupt Channel Grouping
External Interrupt INT7 INT6 INT5 INT4 INT3 INT2 INT1 INT0 Channel INTD1 INTD0 INTC1 INTC0 INTB1 INTB0 INTA1 INTA0
Each source has a trigger control bit TEA0,..TED1 (R242,EITR.0,..,7 Page 0) to select triggering on the rising or falling edge of the external pin. If the Trigger control bit is set to "1", the corresponding pending bit IPA0,..,IPD1 (R243,EIPR.0,..,7 Page 0) is set on the input pin rising edge, if it is cleared, the pending bit is set on the falling edge of the input pin. Each source can be individually masked through the corresponding control bit IMA0,..,IMD1 (EIMR.7,..,0). See Figure 27. The priority level of the external interrupt sources can be programmed among the eight priority levels with the control register EIPLR (R245). The priority level of each pair is software defined using the bits PRL2, PRL1. For each pair, the even channel (A0,B0,C0,D0) of the group has the even priority level and the odd channel (A1,B1,C1,D1) has the odd (lower) priority level. Figure 26. Priority Level Examples
PL2D PL1D PL2C PL1C PL2B PL1B PL2A PL1A
Figure 26 shows an example of priority levels. Figure 27 gives an overview of the External interrupt control bits and vectors. - The source of the interrupt channel INTA0 can be selected between the external pin INT0 (when IA0S = "1", the reset value) or the On-chip Timer/ Watchdog peripheral (when IA0S = "0"). - INTA1: by selecting INTS equal to 0, the standard Timer is chosen as the interrupt. - The source of the interrupt channel INTB0 can be selected between the external pin INT2 (when (SPEN,BMS)=(0,0)) or the SPI peripheral. - INTB1: setting AD-INT.0 to 1 selects the ADC as the interrupt source for channel INTB1. - Setting bit 2 of the CSYCT to 1 selects EOFVBI interrupt as the source for INTC0. Setting this bit to 0 selects external interrupt on INT4. - Setting FSTEN (bit 3 of the CSYCT register) to 1 selects FLDST interrupt for channel INTC1. Setting this bit to 0 selects external interrupt INT5. Interrupt channels INTD0 and INTD1 have an input pin as source. However, the input line may be multiplexed with an on-chip peripheral I/O or connected to an input pin that performs also another function. Warning: When using channels shared by both external interrupts and peripherals, special care must be taken to configure their control registers for both peripherals and interrupts. Table 7. Internal/External Interrupt Source
Channel Internal Interrupt Source Timer/Watchdog Standard Timer SPI Interrupt A/D Converter EOFVBI (SYNC inter) FLDST (SYNC inter) none none External Interrupt Source INT0 None INT2 None INT4 INT5 INT6 INT7
1
SOURCE PRIORITY
0
0
0
1
0
0
1
EIPLR
INTA0 INTA1 INTB0 INTB1 INTC0 INTC1 INTD0 INTD1
SOURCE PRIORITY
INT.D0: 100=4 INT.D1: 101=5 INT.C0: 000=0 INT.C1: 001=1
INT.A0: 010=2 INT.A1: 011=3 INT.B0: 100=4 INT.B1: 101=5 VR000151
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ST92185B - INTERRUPTS
EXTERNAL INTERRUPTS (Cont'd) Figure 27. External Interrupts Control Bits and Vectors
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Watchdog/Timer IA0S End of count TEA0 "0" INT 0 pin "1" INTS Std. Timer Not connected "0" "1" SPEN,BMS TEB0 SPI Interrupt "1,x" INT 2 pin "0,0"
V7 V6 V5 V4 0 0 VECTOR Priority level PL2A PL1A 0 Mask bit IMA0
00 INT A0 request
Pending bit IPA0
*
V7 V6 V5 V4 0 0 VECTOR Priority level PL2A PL1A 1 Mask bit IMA1
10 INT A1 request
Pending bit IPA1
V7 V6 V5 V4 0 1 VECTOR Priority level PL2B PL1B 0 Mask bit IMB0
00 INT B0 request
Pending bit IPB0
*
ADINT ADC Not connected EOFVBI (SYNC inter) "0" "1" VBEN "1" INT 4 pin "0" TEC1 FSTEN FLDST (SYNC inter) "1" INT 5 pin "0" TED0 V7 V6 V5 V4 1 1 VECTOR PL2D PL1D 0 Priority level Mask bit IMD0 TED1 V7 V6 V5 V4 1 1 VECTOR Priority level PL2D PL1D 1 Mask bit IMD1 * 10 INT D1 request 00 INT D0 request V7 V6 V5 V4 1 0 VECTOR Priority level PL2C PL1C 1 Mask bit IMC1 10 INT C1 request Mask bit IMC0 Pending bit IPC0 V7 V6 V5 V4 1 0 VECTOR Priority level PL2C PL1C 0 00 INT C0 request V7 V6 V5 V4 0 1 VECTOR Priority level PL2B PL1B 1 Mask bit IMB1 10 INT B1 request
Pending bit IPB1
TEC0
Pending bit IPC1
INT 6 pin
Pending bit IPD0
INT 7 pin
Pending bit IPD1
Shared channels, see warning
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ST92185B - INTERRUPTS
3.7 TOP LEVEL INTERRUPT The Top Level Interrupt channel can be assigned either to the external pin NMI or to the Timer/ Watchdog according to the status of the control bit EIVR.TLIS (R246.2, Page 0). If this bit is high (the reset condition) the source is the external pin NMI. If it is low, the source is the Timer/ Watchdog End Of Count. When the source is the NMI external pin, the control bit EIVR.TLTEV (R246.3; Page 0) selects between the rising (if set) or falling (if reset) edge generating the interrupt request. When the selected event occurs, the CICR.TLIP bit (R230.6) is set. Depending on the mask situation, a Top Level Interrupt request may be generated. Two kinds of masks are available, a Maskable mask and a Non-Maskable mask. The first mask is the CICR.TLI bit (R230.5): it can be set or cleared to enable or disable respectively the Top Level Interrupt request. If it is enabled, the global Enable Interrupt bit, CICR.IEN (R230.4) must also be enabled in order to allow a Top Level Request. The second mask NICR.TLNM (R247.7) is a setonly mask. Once set, it enables the Top Level Interrupt request independently of the value of CICR.IEN and it cannot be cleared by the program. Only the processor RESET cycle can clear this bit. This does not prevent the user from ignoring some sources due to a change in TLIS. The Top Level Interrupt Service Routine cannot be interrupted by any other interrupt or DMA request, in any arbitration mode, not even by a subsequent Top Level Interrupt request. Figure 28. Top Level Interrupt Structure
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Warning. The interrupt machine cycle of the Top Level Interrupt does not clear the CICR.IEN bit, and the corresponding iret does not set it. Furthermore the TLI never modifies the CPL bits and the NICR register. 3.8 ON-CHIP PERIPHERAL INTERRUPTS The general structure of the peripheral interrupt unit is described here, however each on-chip peripheral has its own specific interrupt unit containing one or more interrupt channels, or DMA channels. Please refer to the specific peripheral chapter for the description of its interrupt features and control registers. The on-chip peripheral interrupt channels provide the following control bits: - Interrupt Pending bit (IP). Set by hardware when the Trigger Event occurs. Can be set/ cleared by software to generate/cancel pending interrupts and give the status for Interrupt polling. - Interrupt Mask bit (IM). If IM = "0", no interrupt request is generated. If IM ="1" an interrupt request is generated whenever IP = "1" and CICR.IEN = "1". - Priority Level (PRL, 3 bits). These bits define the current priority level, PRL=0: the highest priority, PRL=7: the lowest priority (the interrupt cannot be acknowledged) - Interrupt Vector Register (IVR, up to 7 bits). The IVR points to the vector table which itself contains the interrupt routine start address.
WATCHDOG ENABLE WDEN
CORE RESET TLIP PENDING MUX MASK TOP LEVEL INTERRUPT REQUEST
WATCHDOG TIMER END OF COUNT
NMI
OR TLIS
TLTEV TLNM TLI IEN
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ST92185B - INTERRUPTS
3.9 INTERRUPT RESPONSE TIME The interrupt arbitration protocol functions completely asynchronously from instruction flow and requires 5 clock cycles. One more CPUCLK cycle is required when an interrupt is acknowledged. Requests are sampled every 5 CPUCLK cycles. If the interrupt request comes from an external pin, the trigger event must occur a minimum of one INTCLK cycle before the sampling time. When an arbitration results in an interrupt request being generated, the interrupt logic checks if the current instruction (which could be at any stage of execution) can be safely aborted; if this is the case, instruction execution is terminated immediately and the interrupt request is serviced; if not, the CPU waits until the current instruction is terminated and then services the request. Instruction execution can normally be aborted provided no write operation has been performed. For an interrupt deriving from an external interrupt channel, the response time between a user event and the start of the interrupt service routine can range from a minimum of 26 clock cycles to a maximum of 55 clock cycles (DIV instruction), 53 clock cycles (DIVWS and MUL instructions) or 49 for other instructions. For a non-maskable Top Level interrupt, the response time between a user event and the start of the interrupt service routine can range from a minimum of 22 clock cycles to a maximum of 51 clock cycles (DIV instruction), 49 clock cycles (DIVWS and MUL instructions) or 45 for other instructions. In order to guarantee edge detection, input signals must be kept low/high for a minimum of one INTCLK cycle. An interrupt machine cycle requires a basic 18 internal clock cycles (CPUCLK), to which must be added a further 2 clock cycles if the stack is in the Register File. 2 more clock cycles must further be added if the CSR is pushed (ENCSR =1). The interrupt machine cycle duration forms part of the two examples of interrupt response time previously quoted; it includes the time required to push values on the stack, as well as interrupt vector handling. In Wait for Interrupt mode, a further cycle is required as wake-up delay.
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ST92185B - INTERRUPTS
3.10 INTERRUPT REGISTERS CENTRAL INTERRUPT CONTROL REGISTER (CICR) R230 - Read/Write Register Group: System Reset value: 1000 0111 (87h)
7 GCEN TLIP TLI IEN IAM 0 CPL2 CPL1 CPL0
the IEN bit when interrupts are disabled or when no peripheral can generate interrupts. For example, if the state of IEN is not known in advance, and its value must be restored from a previous push of CICR on the stack, use the sequence DI; POP CICR to make sure that no interrupts are being arbitrated when CICR is modified. Bit 3 = IAM: Interrupt Arbitration Mode. This bit is set and cleared by software. 0: Concurrent Mode 1: Nested Mode Bit 2:0 = CPL[2:0]: Current Priority Level. These bits define the Current Priority Level. CPL=0 is the highest priority. CPL=7 is the lowest priority. These bits may be modified directly by the interrupt hardware when Nested Interrupt Mode is used. EXTERNAL INTERRUPT TRIGGER REGISTER (EITR) R242 - Read/Write Register Page: 0 Reset value: 0000 0000 (00h)
7 0
Bit 7 = GCEN: Global Counter Enable. This bit enables the 16-bit Multifunction Timer peripheral. 0: MFT disabled 1: MFT enabled Bit 6 = TLIP: Top Level Interrupt Pending. This bit is set by hardware when Top Level Interrupt (TLI) trigger event occurs. It is cleared by hardware when a TLI is acknowledged. It can also be set by software to implement a software TLI. 0: No TLI pending 1: TLI pending Bit 5 = TLI: Top Level Interrupt. This bit is set and cleared by software. 0: A Top Level Interrupt is generared when TLIP is set, only if TLNM=1 in the NICR register (independently of the value of the IEN bit). 1: A Top Level Interrupt request is generated when IEN=1 and the TLIP bit are set. Bit 4 = IEN: Interrupt Enable. This bit is cleared by the interrupt machine cycle (except for a TLI). It is set by the iret instruction (except for a return from TLI). It is set by the EI instruction. It is cleared by the DI instruction. 0: Maskable interrupts disabled 1: Maskable Interrupts enabled Note: The IEN bit can also be changed by software using any instruction that operates on register CICR, however in this case, take care to avoid spurious interrupts, since IEN cannot be cleared in the middle of an interrupt arbitration. Only modify
TED1 TED0 TEC1 TEC0 TEB1 TEB0 TEA1 TEA0
Bit 7 = TED1: INTD1 Trigger Event Bit 6 = TED0: INTD0 Trigger Event Bit 5 = TEC1: INTC1 Trigger Event Bit 4 = TEC0: INTC0 Trigger Event Bit 3 = TEB1: INTB1 Trigger Event Bit 2 = TEB0: INTB0 Trigger Event Bit 1 = TEA1: INTA1 Trigger Event Bit 0 = TEA0: INTA0 Trigger Event These bits are set and cleared by software. 0: Select falling edge as interrupt trigger event 1: Select rising edge as interrupt trigger event
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ST92185B - INTERRUPTS
INTERRUPT REGISTERS (Cont'd) EXTERNAL INTERRUPT PENDING REGISTER (EIPR) R243 - Read/Write Register Page: 0 Reset value: 0000 0000 (00h)
7 IPD1 IPD0 IPC1 IPC0 IPB1 IPB0 0 IPA1 IPA0
Bit 3 = IMB1: INTB1 Interrupt Mask Bit 2 = IMB0: INTB0 Interrupt Mask Bit 1 = IMA1: INTA1 Interrupt Mask Bit 0 = IMA0: INTA0 Interrupt Mask These bits are set and cleared by software. 0: Interrupt masked 1: Interrupt not masked (an interrupt is generated if the IPxx and IEN bits = 1) EXTERNAL INTERRUPT PRIORITY REGISTER (EIPLR) R245 - Read/Write Register Page: 0 Reset value: 1111 1111 (FFh)
7
Bit 7 = IPD1: INTD1 Interrupt Pending bit Bit 6 = IPD0: INTD0 Interrupt Pending bit Bit 5 = IPC1: INTC1 Interrupt Pending bit Bit 4 = IPC0: INTC0 Interrupt Pending bit Bit 3 = IPB1: INTB1 Interrupt Pending bit Bit 2 = IPB0: INTB0 Interrupt Pending bit Bit 1 = IPA1: INTA1 Interrupt Pending bit Bit 0 = IPA0: INTA0 Interrupt Pending bit These bits are set by hardware on occurrence of a trigger event (as specified in the EITR register) and are cleared by hardware on interrupt acknowledge. They can also be set by software to implement a software interrupt. 0: No interrupt pending 1: Interrupt pending EXTERNAL INTERRUPT MASK-BIT REGISTER (EIMR) R244 - Read/Write Register Page: 0 Reset value: 0000 0000 (00h)
7 0
LEVEL
0
PL2D PL1D PL2C PL1C PL2B PL1B PL2A PL1A
Bit 7:6 = PL2D, PL1D: INTD0, D1 Priority Level. Bit 5:4 = PL2C, PL1C: INTC0, C1 Priority Level. Bit 3:2 = PL2B, PL1B: INTB0, B1 Priority Level. Bit 1:0 = PL2A, PL1A: INTA0, A1 Priority Level. These bits are set and cleared by software. The priority is a three-bit value. The LSB is fixed by hardware at 0 for Channels A0, B0, C0 and D0 and at 1 for Channels A1, B1, C1 and D1.
PL2x 0 0 PL1x 0 1 0 1 Hardware bit 0 1 0 1 0 1 0 1 Priority 0 (Highest) 1 2 3 4 5 6 7 (Lowest)
IMD1 IMD0 IMC1 IMC0 IMB1 IMB0 IMA1 IMA0 1
Bit 7 = IMD1: INTD1 Bit 6 = IMD0: INTD0 Bit 5 = IMC1: INTC1 Bit 4 = IMC0: INTC0
Interrupt Mask Interrupt Mask Interrupt Mask Interrupt Mask
1
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ST92185B - INTERRUPTS
INTERRUPT REGISTERS (Cont'd) EXTERNAL INTERRUPT VECTOR REGISTER (EIVR) R246 - Read/Write Register Page: 0 Reset value: xxxx 0110b (x6h)
7 V7 V6 V5 V4 0 TLTEV TLIS IAOS EWEN
0: WAITN pin disabled 1: WAITN pin enabled (to stretch the external memory access cycle). Note: For more details on Wait mode refer to the section describing the WAITN pin in the External Memory Chapter. NESTED INTERRUPT CONTROL (NICR) R247 - Read/Write Register Page: 0 Reset value: 0000 0000 (00h)
7 TLNM HL6 HL5 HL4 HL3 HL2 HL1 0 HL0
Bit 7:4 = V[7:4]: Most significant nibble of External Interrupt Vector. These bits are not initialized by reset. For a representation of how the full vector is generated from V[7:4] and the selected external interrupt channel, refer to Figure 27. Bit 3 = TLTEV: Top Level Trigger Event bit. This bit is set and cleared by software. 0: Select falling edge as NMI trigger event 1: Select rising edge as NMI trigger event Bit 2 = TLIS: Top Level Input Selection. This bit is set and cleared by software. 0: Watchdog End of Count is TL interrupt source 1: NMI is TL interrupt source Bit 1 = IA0S: Interrupt Channel A0 Selection. This bit is set and cleared by software. 0: Watchdog End of Count is INTA0 source 1: External Interrupt pin is INTA0 source Bit 0 = EWEN: External Wait Enable. This bit is set and cleared by software.
Bit 7 = TLNM: Top Level Not Maskable. This bit is set by software and cleared only by a hardware reset. 0: Top Level Interrupt Maskable. A top level request is generated if the IEN, TLI and TLIP bits =1 1: Top Level Interrupt Not Maskable. A top level request is generated if the TLIP bit =1 Bit 6:0 = HL[6:0]: Hold Level x These bits are set by hardware when, in Nested Mode, an interrupt service routine at level x is interrupted from a request with higher priority (other than the Top Level interrupt request). They are cleared by hardware at the iret execution when the routine at level x is recovered.
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ST92185B - INTERRUPTS
INTERRUPT REGISTERS (Cont'd) EXTERNAL MEMORY REGISTER 2 (EMR2) R246 - Read/Write Register Page: 21 Reset value: 0000 1111 (0Fh)
7 0 ENCSR 0 0 1 1 1 0 1
Bit 7, 5:0 = Reserved, keep in reset state. Refer to the external Memory Interface Chapter. Bit 6 = ENCSR: Enable Code Segment Register. This bit is set and cleared by software. It affects the ST9 CPU behaviour whenever an interrupt request is issued. 0: The CPU works in original ST9 compatibility mode. For the duration of the interrupt service routine, ISR is used instead of CSR, and the interrupt stack frame is identical to that of the original ST9: only the PC and Flags are pushed. This avoids saving the CSR on the stack in the event of an interrupt, thus ensuring a faster in-
terrupt response time. The drawback is that it is not possible for an interrupt service routine to perform inter-segment calls or jumps: these instructions would update the CSR, which, in this case, is not used (ISR is used instead). The code segment size for all interrupt service routines is thus limited to 64K bytes. 1: ISR is only used to point to the interrupt vector table and to initialize the CSR at the beginning of the interrupt service routine: the old CSR is pushed onto the stack together with the PC and flags, and CSR is then loaded with the contents of ISR. In this case, iret will also restore CSR from the stack. This approach allows interrupt service routines to access the entire 4 Mbytes of address space; the drawback is that the interrupt response time is slightly increased, because of the need to also save CSR on the stack. Full compatibility with the original ST9 is lost in this case, because the interrupt stack frame is different; this difference, however, should not affect the vast majority of programs.
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ST92185B - RESET AND CLOCK CONTROL UNIT (RCCU)
4 RESET AND CLOCK CONTROL UNIT (RCCU)
4.1 INTRODUCTION The Reset Control Unit comprises two distinct sections: - An oscillator that uses an external quartz crystal. - The Reset/Stop Manager, which detects and flags Hardware, Software and Watchdog generated resets. 4.2 RESET / STOP MANAGER The RESET/STOP Manager resets the device when one of the three following triggering events occurs: - A hardware reset, consequence of a low level on the RESET pin. - A software reset, consequence of an HALT instruction when enabled. Figure 29. Reset Overview
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- A Watchdog end of count. The RESET input is schmitt triggered. Note: The memorized Internal Reset (called RESETO) will be maintained active for a duration of 32768 Oscin periods (about 8 ms for a 4 MHz crystal) after the external input is released (set high). This RESETO internal Reset signal is output on the I/O port bit P3.7 (active low) during the whole reset phase until the P3.7 configuration is changed by software. The true internal reset (to all macrocells) will only be released 511 Reference clock periods after the Memorized Internal reset is released. It is possible to know which was the last RESET triggering event, by reading bits 5 and 6 of register SDRATH.
RESET
Build-up Counter RCCU Memorized Reset
True Internal Reset
RESETO
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ST92185B - RESET AND CLOCK CONTROL UNIT (RCCU)
4.3 OSCILLATOR CHARACTERISTICS The on-chip oscillator circuit uses an inverting gate circuit with tri-state output. Notes: Owing to the Q factor required, Ceramic Resonators may not provide a reliable oscillator source. The oscillator can not support quartz crystal or ceramic working at the third harmonic without external tank circuits. OSCOUT must not be used to drive external circuits. Halt mode is set by means of the HALT instruction. In this mode the parallel resistor, R, is disconnected and the oscillator is disabled. This forces the internal clock to a high level and OSCOUT to a high impedance state. To exit the HALT condition and restart the oscillator, an external RESET pulse is required. It should be noted that, if the Watchdog function is enabled, a HALT instruction will not disable the oscillator. This to avoid stopping the Watchdog if a HALT code is executed in error. When this occurs, the CPU will be reset when the Watchdog times out or when an external reset is applied. When an HALT instruction is executed, the main crystal oscillator is stoped and any spurious clock are ignored. Other analog systems such as the onchip line PLL or the whole Video chain (Sync Extraction) must be stopped separately by the software as they will induce static consumption. Figure 30. Crystal Oscillator
CRYSTAL CLOCK
ST9
OSCIN
OSCOUT
CL1
CL2
VR02116A
Note: Depending on the application it may be better not to implement CL1 Figure 31. Internal Oscillator Schematic
HALT
R RIN ROUT
Table 8. Oscillator Transconductance
gm mA/V Min 0.77 Typ 1.5 Max 2.4
OSCIN
OSCOUT
VR02086A
Figure 32. External Clock
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EXTERNAL CLOCK
OSCIN
OSCOUT NC
CLOCK INPUT
VR02116B
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ST92185B - RESET AND CLOCK CONTROL UNIT (RCCU)
OSCILLATOR CHARACTERISTICS (Cont'd) The following table is relative to the fundamental quartz crystal only; assuming: - Rs: parasitic series resistance of the quartz crystal (upper limit) - C0: parasitic capacitance of the crystal (upper limit, 7 pF) - C1,C2: maximum total capacitance on pins OSCIN/OSCOUT (value including external capacitance tied to the pin plus the parasitic capacitance of the board and device). Table 9. Crystal Specification (C0 7 pF)
Freq. MHz. 8 4 CL1=CL2= 39 pF Rs Max 65 260
Legend: Rs: Parasitic Series Resistance of the quartz crystal (upper limit) C0: Parasitic capacitance of the quartz crystal (upper limit, < 7 pF) CL1, CL2: Maximum Total Capacitance on pins OSCIN and OSCOUT (the value includes the external capacitance tied to the pin plus the parasitic capacitance of the board and of the device) gm: Transconductance of the oscillator Note.The tables are relative to the fundamental quartz crystal only (not ceramic resonator).
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ST92185B - RESET AND CLOCK CONTROL UNIT (RCCU)
4.4 CLOCK CONTROL REGISTERS MODE REGISTER (MODER) R235 - Read/Write Register Group: E (System) Reset Value: 1110 0000 (E0h)
7 0
WAIT CONTROL REGISTER (WCR) R252 - Read/Write Register Page: 0 Reset Value: 0111 1111 (7Fh)
7
0
0
WDGEN WDM2 WDM1 WDM0 WPM2 WPM1 WPM0
1
1
DIV2
PRS2
PRS1
PRS0
0
0
Bit 7:6 = Bits described in Device Architecture chapter. Bit 5 = DIV2: OSCIN Divided by 2. This bit controls the divide by 2 circuit which operates on the OSCIN Clock. 0: No division of OSCIN Clock 1: OSCIN clock is internally divided by 2 Bit 4:2 = PRS[2:0]: Clock Prescaling. These bits define the prescaler value used to prescale CPUCLK from INTCLK. When they are reset, the CPUCLK is not prescaled, and is equal to INTCLK; in all other cases, the internal clock is prescaled by the value of these three bits plus one. Bit 1:0 = Bits described in Device Architecture chapter.
Bit 7 = Reserved, read as "0". Bit 6 = WDGEN: refer to Timer/Watchdog chapter. WARNING. Resetting this bit to zero has the effect of setting the Timer/Watchdog to the Watchdog mode. Unless this is desired, this must be set to "1". Bit 5:3 = WDM[2:0]: Data Memory Wait Cycles. These bits contain the number of INTCLK cycles to be added automatically to external Data memory accesses. WDM = 0 gives no additional wait cycles. WDM = 7 provides the maximum 7 INTCLK cycles (reset condition). Bit 2:0 = WPM[2:0]: Program Memory Wait Cycles. These bits contain the number of INTCLK cycles to be added automatically to external Program memory accesses. WPM = 0 gives no additional wait cycles, WPM = 7 provides the maximum 7 INTCLK cycles (reset condition). Note: The number of clock cycles added refers to INTCLK and NOT to CPUCLK. WARNING. The reset value of the Wait Control Register gives the maximum number of Wait cycles for external memory. To get optimum performance from the ST9 when used in single-chip mode (no external memory) the user should write the WDM2,1,0 and WPM2,1,0 bits to "0".
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ST92185B - RESET AND CLOCK CONTROL UNIT (RCCU)
4.5 RESET CONTROL UNIT REGISTERS The RCCU consists of two registers. They are PCONF and SDRATH. Unless otherwise stated, unused register bits must be kept in their reset value in order to avoid problems with the device behaviour. PLL CONFIGURATION REGISTER (PCONF) R251 - Read/Write Register Page: 55 Reset value: 0000 0111 (07h)
7 SRESEN 0 0 0 0 1 1 0 1
CLOCK SLOW DOWN UNIT RATIO REGISTER (SDRATH) R254 - Read/Write Register Page: 55 Reset value: 0010 0xxx (2xh) after software reset 0100 0xxx (4xh) after watchdog reset 0000 0000 (00h) after external reset
7 0 WDGRES SFTRES 0 0 x x 0 x
Bit 7 = Reserved bit. Leave in its reset state. Bit 6 = WDGRES. Watchdog Reset. WDGRES is automatically set if the last reset was a watchdog Reset. This is a read only bit. Bit 5 = SFTRES. Software Reset. SFTRES is automatically set if the last reset was a software Reset. This is a read only bit. Bit 4:0 = Reserved bits. Please leave in their reset state.
Bit 7= SRESEN. Software Reset Enable. 0: RCCU PLL and CSDU are turned off when a HALT instruction is performed. 1: RCCU will reset the microcontroller when a HALT instruction is performed. Bit 6:0= Reserved bits. Leave in their reset state.
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ST92185B - TIMING AND CLOCK CONTROLLER
5 TIMING AND CLOCK CONTROLLER
5.1 FREQUENCY MULTIPLIERS Three on-chip frequency multipliers generate the proper frequencies for: the Core/Real time Peripherals, the Display related time base. For both the Core and the Display frequency multipliers, a 4 bit programmable feed-back counter allows the adjustment of the multiplying factor to the application need (a 4 MHz or 8 MHz crystal is assumed).
Figure 33. Timing and Clock Controller Block Diagram
Hsync
SKHPLS SKDIV2 Divide by 2 Synchronized DOTCK / 2 to Display (2X Pixel clock for 1X width characters)
PXFM Frequency Multiplier Skew Corrector
Async. Handler
SKWEN MCFM SLDIV2 Divide by 2
SKWL(3:0) 4 MHz real time Frequency Multiplier
(Synchronized DOTCK) SKDIV2 Divide by 2
to Display Storage RAM (TRI)
FMEN
FML(3:0)
Divide by 2 OSCIN Xtal Oscillator OSCOUT FMEN FMSL Asynch. Handler Main Clock Controller Fimf Div-2 Prescaler 1 to 8
Memory Wait BREQ WFI
Clock Control
CPUCLK INTCLK
MODER.5 ST9 Clock Control Unit (RCCU)
VR02095A
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ST92185B - TIMING AND CLOCK CONTROLLER
FREQUENCY MULTIPLIERS (Cont'd) For the Off-chip filter components please refer to the Required External Components figure provided in the first section of the data sheet. The frequency multipliers are off during and upon exiting from the reset phase. The user must program the desired multiplying factor, start the multiplier and then wait for its stability. Once the Core/Peripherals multiplier is stabilized, the Main Clock controller can be re-programmed (through the FMSL bit, MCCR.6) to provide the final frequency (INTCLK) to the CPU. The frequency multipliers are automatically switched off when the P enters in HALT mode (the HALT mode forces the control register to its reset status). Table 10. Examples of CPU speed choice
Crystal Frequency 4 MHz FML (3:0) 4 Internal Frequency (Fimf) 10 MHz 4 MHz 4 MHz 4 MHz 4 MHz 4 MHz 5 6 7 8 11 12 MHz 14 MHz 16 MHz 18 MHz 24 MHz
Note: 24 MHz is the max. CPU authorized frequency.
Table 11. DOTCK/2 frequency choices
SKW (3:0) 8 9 10 11 (*) Preferred values for 4/3. (**) 16/9 screen formats. Note: 18 MHz is the min. DOTCK/2 authorized frequency. DOTCK/2 18 MHz 20 MHz(*) 22 MHz 24 MHz (**)
Table 12. External PLL Filter Stabilisation time
Clock Pin Name MCFM PXFM Clock Name Main Clock PLL Filter Input Pin Pixel Clock PLL Filter Input Pin Control Register MCCR PXCCR Stabilization Period 35 ms. 35 ms
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ST92185B - TIMING AND CLOCK CONTROLLER
Figure 34. Programming the MCCR
Set the PLL frequency FML (3:0)
Example: spp #27h ;Set the page
Start the PLL by setting FMEN = 1
ld MCCR, #04h ;Set FML bits to the value needed e.g. 10 MHz or MCCR, #80h ;Starts the PLL
Wait for Clock Stabilization
Wait for stabilization time or MCCR, #40h ;Validate the PLL as the main CPU Clock
Validate PLL as Main CPU Clock
Figure 35. Programming the SKCCR, PXCCR
Set the PLL frequency SKW (3:0)
Example: spp #27h ;Set the page
Start the PLL by setting SKWEN = 1
ld SKCCR, #04h ;Set SKW bits to the value needed or SKCCR, #80h ;Starts the PLL
Wait for Clock Stabilization
Wait for stabilization time or PXCCR, #80h ;PLL is fed as DOTCK to the TDSRAM & OSDPLL
Validate PLL is fed to TDSRAM and OSD
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ST92185B - TIMING AND CLOCK CONTROLLER
5.2 REGISTER DESCRIPTION MAIN CLOCK CONTROL REGISTER (MCCR) R253 - Read/ Write Register Page: 39 Reset value: 0000 0000 (00h)
7 6 5 0 4 0 3 2 1 0
SKEW CLOCK CONTROL REGISTER (SKCCR) R254 - Read/ Write Register Page: 39 Reset value: 0000 0000 (00h)
7 6 5 0 4 0 3 2 1 0
FMEN FMSL
FML3 FML2 FML1 FML0
SKW SKDIV2 EN
SKW3 SKW2 SKW1 SKW0
The HALT mode forces the register to its initialization state. Bit 7 = FMEN. Frequency Multiplier Enable bit. 0: FM disabled (reset state), low-power consumption mode. 1: FM is enabled, providing clock to the CPU. The FMEN bit must be set only after programming the FML(3:0) bits. Bit 6= FMSL. Frequency Multiplier Select bit. This bit controls the choice of the ST9+ core internal frequency between the external crystal frequency and the Main Clock issued by the frequency multiplier. In order to secure the application, the ST9+ core internal frequency is automatically switched back to the external crystal frequency if the frequency multiplier is switched off (FMEN =0) regardless of the value of the FMSL bit. Care must be taken to reset the FMSL bit before any frequency multiplier can restart (FMEN set back to 1). After reset, the external crystal frequency is always sent to the ST9+ Core. Bit 5:4 = These bits are reserved. Bit 3:0 = FML[3:0] Frequency bits. These 4 bits program the down-counter inserted in the feed-back loop of the Frequency Multiplier which generates the internal multiplied frequency Fimf. The Fimf value is calculated as follows : Fimf = Crystal frequency * [ (FML(3:0) + 1) ] /2
The HALT mode forces the register to its initialization state. Bit 7= SKWEN. Frequency Multiplier Enable bit. 0: FM disabled (reset state), low-power consumption mode. 1: FM is enabled, supplying the clock to the Skew corrector. The SKWEN bit must be set only after programming the SKW(3-0) bits. Bit 6= SKDIV2. Divide-by-2 enable This bit determines whether a divide-by-2 downscaling factor is applied to the output of the Skew Corrector. 0 = Divide-by-2 enabled 1 = Divide-by-2 disabled Bit 5:4 = These bits are reserved. Bit 3:0 = SKW[3:0]. Frequency bits These 4 bits program the down-counter inserted in the feedback loop of the Frequency Multiplier which generates the internal multiplied frequency DOTCK. The DOTCK value is calculated as follows : F(DOTCK) = Crystal frequency * [ (SKW(3:0) + 1) ]
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ST92185B - TIMING AND CLOCK CONTROLLER
REGISTER DESCRIPTION (Cont'd) PLL CLOCK CONTROL REGISTER (PXCCR) R251 - Read/Write Register Page: 39 Reset value: 0000 0000 (00h)
7 PXCE 6 0 5 0 4 0 3 0 2 0 1 0 0 0
Bit 7:5 = These bits are reserved. Bit 4= VMOD: Video mode selection. This bit is used to select either 50Hz or 60Hz video mode. It is set and cleared by software. 0: 50 Hz. 1: 60 Hz. Bit 3:0= These bits are reserved. 5.2.1 Register Mapping The Timing Controller has 4 dedicated registers, mapped in a ST9+ register file page (the page address is 39 (27h)), as follows :
FEh FDh FCh FBh Page 39 (27h) Skew Corrector Control Register Main Clock Control Register SLicer Clock Control Register Pixel Clock Control Register SKCCR MCCR SLCCR PXCCR
Bit 7= PXCE. Pixel Clock Enable bit. 0: Pixel and TDSRAM interface clocks are blocked 1: Pixel clock is sent to the display controller and TDSRAM interface. Bit 6:0= These bits are reserved. SLICER CLOCK CONTROL (SLCCR) R252 - Read/ Write Register Page: 39 Reset value: 0000 0000 (00h)
7 0 6 0 5 0 4 VMOD 3 0 2 0
REGISTER
1 0
0 0
The HALT mode forces the register to its initialization state.
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ST92185B - I/O PORTS
6 I/O PORTS
6.1 INTRODUCTION ST9 devices feature flexible individually programmable multifunctional input/output lines. Refer to the Pin Description Chapter for specific pin allocations. These lines, which are logically grouped as 8-bit ports, can be individually programmed to provide digital input/output and analog input, or to connect input/output signals to the on-chip peripherals as alternate pin functions. All ports can be individually configured as an input, bi-directional, output or alternate function. In addition, pull-ups can be turned off for open-drain operation, and weak pull-ups can be turned on in their place, to avoid the need for off-chip resistive pull-ups. Ports configured as open drain must never have voltage on the port pin exceeding VDD (refer to the Electrical Characteristics section). Depending on the specific port, input buffers are software selectable to be TTL or CMOS compatible, however on Schmitt trigger ports, no selection is possible. Figure 36. I/O Register Map
GROUP E FFh FEh FDh FCh FBh FAh F9h F8h F7h F6h F5h F4h F3h F2h F1h F0h GROUP F PAGE 2 Reserved P3C2 P3C1 P3C0 Reserved P2C2 P2C1 P2C0 Reserved P1C2 P1C1 P1C0 Reserved P0C2 P0C1 P0C0 GROUP F PAGE 3 P7DR P7C2 P7C1 P7C0 P6DR P6C2 P6C1 P6C0 Reserved P5C2 P5C1 P5C0 Reserved P4C2 P4C1 P4C0 GROUP F PAGE 43 P9DR P9C2 P9C1 P9C0 P8DR P8C2 P8C1 P8C0
6.2 SPECIFIC PORT CONFIGURATIONS Refer to the Pin Description chapter for a list of the specific port styles and reset values. 6.3 PORT CONTROL REGISTERS Each port is associated with a Data register (PxDR) and three Control registers (PxC0, PxC1, PxC2). These define the port configuration and allow dynamic configuration changes during program execution. Port Data and Control registers are mapped into the Register File as shown in Figure 1. Port Data and Control registers are treated just like any other general purpose register. There are no special instructions for port manipulation: any instruction that can address a register, can address the ports. Data can be directly accessed in the port register, without passing through other memory or "accumulator" locations.
System Registers
E5h E4h E3h E2h E1h E0h
P5DR P4DR P3DR P2DR P1DR P0DR
R229 R228 R227 R226 R225 R224
Reserved
R255 R254 R253 R252 R251 R250 R249 R248 R247 R246 R245 R244 R243 R242 R241 R240
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ST92185B - I/O PORTS
PORT CONTROL REGISTERS (Cont'd) During Reset, ports with weak pull-ups are set in bidirectional/weak pull-up mode and the output Data Register is set to FFh. This condition is also held after Reset, except for Ports 0 and 1 in ROMless devices, and can be redefined under software control. Bidirectional ports without weak pull-ups are set in high impedance during reset. To ensure proper levels during reset, these ports must be externally connected to either V DD or VSS through external pull-up or pull-down resistors. Other reset conditions may apply in specific ST9 devices. 6.4 INPUT/OUTPUT BIT CONFIGURATION By programming the control bits PxC0.n and PxC1.n (see Figure 2) it is possible to configure bit Px.n as Input, Output, Bidirectional or Alternate Function Output, where X is the number of the I/O port, and n the bit within the port (n = 0 to 7). When programmed as input, it is possible to select the input level as TTL or CMOS compatible by programming the relevant PxC2.n control bit. This option is not available on Schmitt trigger ports. The output buffer can be programmed as pushpull or open-drain. A weak pull-up configuration can be used to avoid external pull-ups when programmed as bidirectional (except where the weak pull-up option has been permanently disabled in the pin hardware assignment). Each pin of an I/O port may assume software programmable Alternate Functions (refer to the device Pin Description and to Section 1.5). To output signals from the ST9 peripherals, the port must be configured as AF OUT. On ST9 devices with A/D Converter(s), configure the ports used for analog inputs as AF IN. The basic structure of the bit Px.n of a general purpose port Px is shown in Figure 3. Independently of the chosen configuration, when the user addresses the port as the destination register of an instruction, the port is written to and the data is transferred from the internal Data Bus to the Output Master Latches. When the port is addressed as the source register of an instruction, the port is read and the data (stored in the Input Latch) is transferred to the internal Data Bus. When Px.n is programmed as an Input: (See Figure 4). - The Output Buffer is forced tristate. - The data present on the I/O pin is sampled into the Input Latch at the beginning of each instruction execution. - The data stored in the Output Master Latch is copied into the Output Slave Latch at the end of the execution of each instruction. Thus, if bit Px.n is reconfigured as an Output or Bidirectional, the data stored in the Output Slave Latch will be reflected on the I/O pin.
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ST92185B - I/O PORTS
INPUT/OUTPUT BIT CONFIGURATION (Cont'd) Figure 37. Control Bits
Bit 7 PxC2 PxC27 Bit n PxC2n Bit 0 PxC20
PxC1
PxC17
PxC1n
PxC10
PxC0
n
PxC07
PxC0n
PxC00
Table 13. Port Bit Configuration Table (n = 0, 1... 7; X = port number)
General Purpose I/O Pins PXC2n PXC1n PXC0n PXn Configuration PXn Output Type PXn Input Type 0 0 0 BID WP OD TTL
(or Schmitt Trigger)
A/D Pins 1 0 1 IN HI-Z TTL 0 1 1 AF OUT PP TTL
(or Schmitt Trigger)
1 0 0 BID OD TTL
(or Schmitt Trigger)
0 1 0 OUT PP TTL
(or Schmitt Trigger)
1 1 0 OUT OD TTL
(or Schmitt Trigger)
0 0 1 IN HI-Z CMOS
(or Schmitt Trigger)
1 1 1 AF OUT OD TTL
(or Schmitt Trigger)
1 1 1 AF IN HI-Z(1) Analog Input
(or Schmitt Trigger)
(1)
For A/D Converter inputs. Port Bit Alternate Function Bidirectional CMOS Standard Input Levels High Impedance Input Open Drain Output Push-Pull TTL Standard Input Levels Weak Pull-up
Legend:
X = n = AF = BID = CMOS= HI-Z = IN = OD = OUT = PP = TTL = WP =
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ST92185B - I/O PORTS
INPUT/OUTPUT BIT CONFIGURATION (Cont'd) Figure 38. Basic Structure of an I/O Port Pin
I/O PIN
PUSH-PULL TRISTATE OPEN DRAIN WEAK PULL-UP
TTL / CMOS (or Schmitt Trigger)
OUTPUT SLAVE LATCH FROM PERIPHERAL OUTPUT ALTERNATE FUNCTION INPUT OUTPUT BIDIRECTIONAL OUTPUT
TO PERIPHERAL INPUTS AND INTERRUPTS INPUT BIDIRECTIONAL ALTERNATE FUNCTION INPUT LATCH
OUTPUT MASTER LATCH
INTERNAL DATA BUS
Figure 39. Input Configuration
I/O PIN
Figure 40. Output Configuration
I/O PIN
TRISTATE
TTL / CMOS (or Schmitt Trigger) TO PERIPHERAL INPUTS AND INTERRUPTS
OPEN DRAIN PUSH-PULL
TTL (or Schmitt Trigger) TO PERIPHERAL INPUTS AND INTERRUPTS
OUTPUT SLAVE LATCH
OUTPUT SLAVE LATCH
OUTPUT MASTER LATCH
INPUT LATCH
OUTPUT MASTER LATCH
INPUT LATCH
INTERNAL DATA BUS
n n n
INTERNAL DATA BUS
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ST92185B - I/O PORTS
INPUT/OUTPUT BIT CONFIGURATION (Cont'd) When Px.n is programmed as an Output: (Figure 5) - The Output Buffer is turned on in an Open-drain or Push-pull configuration. - The data stored in the Output Master Latch is copied both into the Input Latch and into the Output Slave Latch, driving the I/O pin, at the end of the execution of the instruction. When Px.n is programmed as Bidirectional: (Figure 6) - The Output Buffer is turned on in an Open-Drain or Weak Pull-up configuration (except when disabled in hardware). - The data present on the I/O pin is sampled into the Input Latch at the beginning of the execution of the instruction. - The data stored in the Output Master Latch is copied into the Output Slave Latch, driving the I/ O pin, at the end of the execution of the instruction. WARNING: Due to the fact that in bidirectional mode the external pin is read instead of the output latch, particular care must be taken with arithmetic/logic and Boolean instructions performed on a bidirectional port pin. These instructions use a read-modify-write sequence, and the result written in the port register depends on the logical level present on the external pin. This may bring unwanted modifications to the port output register content. For example: Port register content, 0Fh external port value, 03h (Bits 3 and 2 are externally forced to 0) A bset instruction on bit 7 will return: Port register content, 83h external port value, 83h (Bits 3 and 2 have been cleared). To avoid this situation, it is suggested that all operations on a port, using at least one bit in bidirectional mode, are performed on a copy of the port register, then transferring the result with a load instruction to the I/O port. When Px.n is programmed as a digital Alternate Function Output: (Figure 7) - The Output Buffer is turned on in an Open-Drain or Push-Pull configuration. - The data present on the I/O pin is sampled into the Input Latch at the beginning of the execution of the instruction. - The signal from an on-chip function is allowed to load the Output Slave Latch driving the I/O pin. Signal timing is under control of the alternate function. If no alternate function is connected to Px.n, the I/O pin is driven to a high level when in Push-Pull configuration, and to a high impedance state when in open drain configuration. Figure 41. Bidirectional Configuration
I/O PIN
WEAK PULL-UP OPEN DRAIN
TTL (or Schmitt Trigger) TO PERIPHERAL INPUTS AND INTERRUPTS
OUTPUT SLAVE LATCH
OUTPUT MASTER LATCH
INPUT LATCH
INTERNAL DATA BUS
n n
Figure 42. Alternate Function Configuration
I/O PIN
OPEN DRAIN PUSH-PULL
TTL (or Schmitt Trigger) TO PERIPHERAL INPUTS AND INTERRUPTS
OUTPUT SLAVE LATCH
FROM PERIPHERAL OUTPUT INPUT LATCH
INTERNAL DATA BUS
n n n n n n
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ST92185B - I/O PORTS
6.5 ALTERNATE FUNCTION ARCHITECTURE Each I/O pin may be connected to three different types of internal signal: - Data bus Input/Output - Alternate Function Input - Alternate Function Output 6.5.1 Pin Declared as I/O A pin declared as I/O, is connected to the I/O buffer. This pin may be an Input, an Output, or a bidirectional I/O, depending on the value stored in (PxC2, PxC1 and PxC0). 6.5.2 Pin Declared as an Alternate Function Input A single pin may be directly connected to several Alternate Function inputs. In this case, the user must select the required input mode (with the PxC2, PxC1, PxC0 bits) and enable the selected Alternate Function in the Control Register of the peripheral. No specific port configuration is required to enable an Alternate Function input, since the input buffer is directly connected to each alternate function module on the shared pin. As more than one module can use the same input, it is up to the user software to enable the required module as necessary. Parallel I/Os remain operational even when using an Alternate Function input. The exception to this is when an I/O port bit is permanently assigned by hardware as an A/D bit. In this case , after software programming of the bit in AFOD-TTL, the Alternate function output is forced to logic level 1. The analog voltage level on the corresponding pin is directly input to the A/D (See Figure 8). Figure 43. A/D Input Configuration
I/O PIN TOWARDS A/D CONVERTER GND
6.5.3 Pin Declared as an Alternate Function Output The user must select the AF OUT configuration using the PxC2, PxC1, PxC0 bits. Several Alternate Function outputs may drive a common pin. In such case, the Alternate Function output signals are logically ANDed before driving the common pin. The user must therefore enable the required Alternate Function Output by software.
WARNING: When a pin is connected both to an alternate function output and to an alternate function input, it should be noted that the output signal will always be present on the alternate function input.
6.6 I/O STATUS AFTER WFI, HALT AND RESET The status of the I/O ports during the Wait For Interrupt, Halt and Reset operational modes is shown in the following table. The External Memory Interface ports are shown separately. If only the internal memory is being used and the ports are acting as I/O, the status is the same as shown for the other I/O ports.
Mode Ext. Mem - I/O Ports P1, P2, P0 P6, P9 High Impedance or next address (depending on Next the last Address memory operation performed on Port) High ImpedNext ance Address I/O Ports
WFI
Not Affected (clock outputs running)
HALT
TRISTATE
RESET
OUTPUT SLAVE LATCH INPUT BUFFER
Not Affected (clock outputs stopped) Bidirectional Weak Alternate function push- Pull-up (High impedance when disapull (ROMless device) bled in hardware).
OUTPUT MASTER LATCH
INPUT LATCH
INTERNAL DATA BUS
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ST92185B - TIMER/WATCHDOG (WDT)
7 ON-CHIP PERIPHERALS
7.1 TIMER/WATCHDOG (WDT) Important Note: This chapter is a generic description of the WDT peripheral. However depending on the ST9 device, some or all of WDT interface signals described may not be connected to external pins. For the list of WDT pins present on the ST9 device, refer to the device pinout description in the first section of the data sheet. 7.1.1 Introduction The Timer/Watchdog (WDT) peripheral consists of a programmable 16-bit timer and an 8-bit prescaler. It can be used, for example, to: - Generate periodic interrupts - Measure input signal pulse widths - Request an interrupt after a set number of events - Generate an output signal waveform - Act as a Watchdog timer to monitor system integrity Figure 44. Timer/Watchdog Block Diagram
INEN INMD1 INMD2 INPUT & CLOCK CONTROL LOGIC INTCLK/4 OUTMD WROUT OUTEN MUX WDT CLOCK
The main WDT registers are: - Control register for the input, output and interrupt logic blocks (WDTCR) - 16-bit counter register pair (WDTHR, WDTLR) - Prescaler register (WDTPR) The hardware interface consists of up to five signals: - WDIN External clock input - WDOUT Square wave or PWM signal output - INT0 External interrupt input - NMI Non-Maskable Interrupt input - HW0SW1 Hardware/Software Watchdog enable.
WDIN1
WDTPR 8-BIT PRESCALER
WDTRH, WDTRL 16-BIT DOWNCOUNTER
END OF COUNT
NMI 1 INT01 HW0SW11 MUX WDGEN INTERRUPT IAOS TLIS CONTROL LOGIC
OUTPUT CONTROL LOGIC
WDOUT1
RESET TOP LEVEL INTERRUPT REQUEST
1
Pin not present on some ST9 devices.
INTA0 REQUEST
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ST92185B - TIMER/WATCHDOG (WDT)
TIMER/WATCHDOG (Cont'd) 7.1.2 Functional Description 7.1.2.1 External Signals The HW0SW1 pin can be used to permanently enable Watchdog mode. Refer to Section 0.1.3.1. The WDIN Input pin can be used in one of four modes: - Event Counter Mode - Gated External Input Mode - Triggerable Input Mode - Retriggerable Input Mode The WDOUT output pin can be used to generate a square wave or a Pulse Width Modulated signal. An interrupt, generated when the WDT is running as the 16-bit Timer/Counter, can be used as a Top Level Interrupt or as an interrupt source connected to channel A0 of the external interrupt structure (replacing the INT0 interrupt input). The counter can be driven either by an external clock, or internally by INTCLK divided by 4. 7.1.2.2 Initialisation The prescaler (WDTPR) and counter (WDTRL, WDTRH) registers must be loaded with initial values before starting the Timer/Counter. If this is not done, counting will start with reset values. 7.1.2.3 Start/Stop The ST_SP bit enables downcounting. When this bit is set, the Timer will start at the beginning of the following instruction. Resetting this bit stops the counter. If the counter is stopped and restarted, counting will resume from the last value unless a new constant has been entered in the Timer registers (WDTRL, WDTRH). A new constant can be written in the WDTRH, WDTRL, WDTPR registers while the counter is running. The new value of the WDTRH, WDTRL registers will be loaded at the next End of Count (EOC) condition while the new value of the WDTPR register will be effective immediately. End of Count is when the counter is 0. When Watchdog mode is enabled the state of the ST_SP bit is irrelevant.
7.1.2.4 Single/Continuous Mode The S_C bit allows selection of single or continuous mode.This Mode bit can be written with the Timer stopped or running. It is possible to toggle the S_C bit and start the counter with the same instruction. Single Mode On reaching the End Of Count condition, the Timer stops, reloads the constant, and resets the Start/ Stop bit. Software can check the current status by reading this bit. To restart the Timer, set the Start/ Stop bit. Note: If the Timer constant has been modified during the stop period, it is reloaded at start time. Continuous Mode On reaching the End Of Count condition, the counter automatically reloads the constant and restarts. It is stopped only if the Start/Stop bit is reset. 7.1.2.5 Input Section If the Timer/Counter input is enabled (INEN bit) it can count pulses input on the WDIN pin. Otherwise it counts the internal clock/4. For instance, when INTCLK = 24MHz, the End Of Count rate is: 2.79 seconds for Maximum Count (Timer Const. = FFFFh, Prescaler Const. = FFh) 166 ns for Minimum Count (Timer Const. = 0000h, Prescaler Const. = 00h) The Input pin can be used in one of four modes: - Event Counter Mode - Gated External Input Mode - Triggerable Input Mode - Retriggerable Input Mode The mode is configurable in the WDTCR. 7.1.2.6 Event Counter Mode In this mode the Timer is driven by the external clock applied to the input pin, thus operating as an event counter. The event is defined as a high to low transition of the input signal. Spacing between trailing edges should be at least 8 INTCLK periods (or 333ns with INTCLK = 24MHz). Counting starts at the next input event after the ST_SP bit is set and stops when the ST_SP bit is reset.
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ST92185B - TIMER/WATCHDOG (WDT)
TIMER/WATCHDOG (Cont'd) 7.1.2.7 Gated Input Mode This mode can be used for pulse width measurement. The Timer is clocked by INTCLK/4, and is started and stopped by means of the input pin and the ST_SP bit. When the input pin is high, the Timer counts. When it is low, counting stops. The maximum input pin frequency is equivalent to INTCLK/8. 7.1.2.8 Triggerable Input Mode The Timer (clocked internally by INTCLK/4) is started by the following sequence: - setting the Start-Stop bit, followed by - a High to Low transition on the input pin. To stop the Timer, reset the ST_SP bit. 7.1.2.9 Retriggerable Input Mode In this mode, the Timer (clocked internally by INTCLK/4) is started by setting the ST_SP bit. A High to Low transition on the input pin causes counting to restart from the initial value. When the Timer is stopped (ST_SP bit reset), a High to Low transition of the input pin has no effect. 7.1.2.10 Timer/Counter Output Modes Output modes are selected by means of the OUTEN (Output Enable) and OUTMD (Output Mode) bits of the WDTCR register. No Output Mode (OUTEN = "0") The output is disabled and the corresponding pin is set high, in order to allow other alternate functions to use the I/O pin. Square Wave Output Mode (OUTEN = "1", OUTMD = "0") The Timer outputs a signal with a frequency equal to half the End of Count repetition rate on the WDOUT pin. With an INTCLK frequency of 20MHz, this allows a square wave signal to be generated whose period can range from 400ns to 6.7 seconds. Pulse Width Modulated Output Mode (OUTEN = "1", OUTMD = "1") The state of the WROUT bit is transferred to the output pin (WDOUT) at the End of Count, and is held until the next End of Count condition. The user can thus generate PWM signals by modifying the status of the WROUT pin between End of Count events, based on software counters decremented by the Timer Watchdog interrupt.
7.1.3 Watchdog Timer Operation This mode is used to detect the occurrence of a software fault, usually generated by external interference or by unforeseen logical conditions, which causes the application program to abandon its normal sequence of operation. The Watchdog, when enabled, resets the MCU, unless the program executes the correct write sequence before expiry of the programmed time period. The application program must be designed so as to correctly write to the WDTLR Watchdog register at regular intervals during all phases of normal operation. 7.1.3.1 Hardware Watchdog/Software Watchdog The HW0SW1 pin (when available) selects Hardware Watchdog or Software Watchdog. If HW0SW1 is held low: - The Watchdog is enabled by hardware immediately after an external reset. (Note: Software reset or Watchdog reset have no effect on the Watchdog enable status). - The initial counter value (FFFFh) cannot be modified, however software can change the prescaler value on the fly. - The WDGEN bit has no effect. (Note: it is not forced low). If HW0SW1 is held high, or is not present: - The Watchdog can be enabled by resetting the WDGEN bit. 7.1.3.2 Starting the Watchdog In Watchdog mode the Timer is clocked by INTCLK/4. If the Watchdog is software enabled, the time base must be written in the timer registers before entering Watchdog mode by resetting the WDGEN bit. Once reset, this bit cannot be changed by software. If the Watchdog is hardware enabled, the time base is fixed by the reset value of the registers. Resetting WDGEN causes the counter to start, regardless of the value of the Start-Stop bit. In Watchdog mode, only the Prescaler Constant may be modified. If the End of Count condition is reached a System Reset is generated.
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ST92185B - TIMER/WATCHDOG (WDT)
TIMER/WATCHDOG (Cont'd) 7.1.3.3 Preventing Watchdog System Reset In order to prevent a system reset, the sequence AAh, 55h must be written to WDTLR (Watchdog Timer Low Register). Once 55h has been written, the Timer reloads the constant and counting restarts from the preset value. To reload the counter, the two writing operations must be performed sequentially without inserting other instructions that modify the value of the WDTLR register between the writing operations. The maximum allowed time between two reloads of the counter depends on the Watchdog timeout period. Figure 45. Watchdog Timer Mode
COUNT VALUE
7.1.3.4 Non-Stop Operation In Watchdog Mode, a Halt instruction is regarded as illegal. Execution of the Halt instruction stops further execution by the CPU and interrupt acknowledgment, but does not stop INTCLK, CPUCLK or the Watchdog Timer, which will cause a System Reset when the End of Count condition is reached. Furthermore, ST_SP, S_C and the Input Mode selection bits are ignored. Hence, regardless of their status, the counter always runs in Continuous Mode, driven by the internal clock. The Output mode should not be enabled, since in this context it is meaningless.
TIMER START COUNTING
RESET
WRITE WDTRH,WDTRL WDGEN=0 WRITE AAh,55h INTO WDTRL PRODUCE COUNT RELOAD SOFTWARE FAIL (E.G. INFINITE LOOP) OR PERIPHERAL FAIL
VA00220
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ST92185B - TIMER/WATCHDOG (WDT)
TIMER/WATCHDOG (Cont'd) 7.1.4 WDT Interrupts The Timer/Watchdog issues an interrupt request at every End of Count, when this feature is enabled. A pair of control bits, IA0S (EIVR.1, Interrupt A0 selection bit) and TLIS (EIVR.2, Top Level Input Selection bit) allow the selection of 2 interrupt sources (Timer/Watchdog End of Count, or External Pin) handled in two different ways, as a Top Level Non Maskable Interrupt (Software Reset), or as a source for channel A0 of the external interrupt logic. A block diagram of the interrupt logic is given in Figure 3. Note: Software traps can be generated by setting the appropriate interrupt pending bit. Table 1 below, shows all the possible configurations of interrupt/reset sources which relate to the Timer/Watchdog. A reset caused by the watchdog will set bit 6, WDGRES of R242 - Page 55 (Clock Flag Register). See section CLOCK CONTROL REGISTERS.
Figure 46. Interrupt Sources
TIMER WATCHDOG
RESET
WDGEN (WCR.6)
0 MUX INT0 1 IA0S (EIVR.1) INTA0 REQUEST
0 MUX NMI 1 TLIS (EIVR.2) VA00293 TOP LEVEL INTERRUPT REQUEST
Table 14. Interrupt Configuration
Control Bits WDGEN 0 0 0 0 1 1 1 1 IA0S 0 0 1 1 0 0 1 1 TLIS 0 1 0 1 0 1 0 1 Reset WDG/Ext Reset WDG/Ext Reset WDG/Ext Reset WDG/Ext Reset Ext Ext Ext Ext Reset Reset Reset Reset Enabled Sources INTA0 SW TRAP SW TRAP Ext Pin Ext Pin Timer Timer Ext Pin Ext Pin Top Level SW TRAP Ext Pin SW TRAP Ext Pin Timer Ext Pin Timer Ext Pin Operating Mode Watchdog Watchdog Watchdog Watchdog Timer Timer Timer Timer
Legend: WDG = Watchdog function SW TRAP = Software Trap Note: If IA0S and TLIS = 0 (enabling the Watchdog EOC as interrupt source for both Top Level and INTA0 interrupts), only the INTA0 interrupt is taken into account.
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ST92185B - TIMER/WATCHDOG (WDT)
TIMER/WATCHDOG (Cont'd) 7.1.5 Register Description The Timer/Watchdog is associated with 4 registers mapped into Group F, Page 0 of the Register File. WDTHR: Timer/Watchdog High Register WDTLR: Timer/Watchdog Low Register WDTPR: Timer/Watchdog Prescaler Register WDTCR: Timer/Watchdog Control Register Three additional control bits are mapped in the following registers on Page 0: Watchdog Mode Enable, (WCR.6) Top Level Interrupt Selection, (EIVR.2) Interrupt A0 Channel Selection, (EIVR.1) Note: The registers containing these bits also contain other functions. Only the bits relevant to the operation of the Timer/Watchdog are shown here. Counter Register This 16-bit register (WDTLR, WDTHR) is used to load the 16-bit counter value. The registers can be read or written "on the fly". TIMER/WATCHDOG HIGH REGISTER (WDTHR) R248 - Read/Write Register Page: 0 Reset value: 1111 1111 (FFh)
7 R15 R14 R13 R12 R11 R10 R9 0 R8
TIMER/WATCHDOG PRESCALER REGISTER (WDTPR) R250 - Read/Write Register Page: 0 Reset value: 1111 1111 (FFh)
7 PR7 PR6 PR5 PR4 PR3 PR2 PR1 0 PR0
Bits 7:0 = PR[7:0] Prescaler value. A programmable value from 1 (00h) to 256 (FFh).
Warning: In order to prevent incorrect operation of the Timer/Watchdog, the prescaler (WDTPR) and counter (WDTRL, WDTRH) registers must be initialised before starting the Timer/Watchdog. If this is not done, counting will start with the reset (un-initialised) values.
WATCHDOG TIMER CONTROL REGISTER (WDTCR) R251- Read/Write Register Page: 0 Reset value: 0001 0010 (12h)
7
ST_SP S_C INMD1 INMD2 INEN OUTMD WROUT
0
OUTEN
Bits 7:0 = R[15:8] Counter Most Significant Bits.
Bit 7 = ST_SP: Start/Stop Bit. This bit is set and cleared by software. 0: Stop counting 1: Start counting (see Warning above) Bit 6 = S_C: Single/Continuous. This bit is set and cleared by software. 0: Continuous Mode 1: Single Mode Bits 5:4 = INMD[1:2]: Input mode selection bits. These bits select the input mode:
INMD1 0 0 1 1 INMD2 0 1 0 1 INPUT MODE Event Counter Gated Input (Reset value) Triggerable Input Retriggerable Input
TIMER/WATCHDOG LOW REGISTER (WDTLR) R249 - Read/Write Register Page: 0 Reset value: 1111 1111b (FFh)
7 R7 R6 R5 R4 R3 R2 R1 0 R0
Bits 7:0 = R[7:0] Counter Least Significant Bits.
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ST92185B - TIMER/WATCHDOG (WDT)
TIMER/WATCHDOG (Cont'd) Bit 3 = INEN: Input Enable. This bit is set and cleared by software. 0: Disable input section 1: Enable input section Bit 2 = OUTMD: Output Mode. This bit is set and cleared by software. 0: The output is toggled at every End of Count 1: The value of the WROUT bit is transferred to the output pin on every End Of Count if OUTEN=1. Bit 1 = WROUT: Write Out. The status of this bit is transferred to the Output pin when OUTMD is set; it is user definable to allow PWM output (on Reset WROUT is set). Bit 0 = OUTEN: Output Enable bit. This bit is set and cleared by software. 0: Disable output 1: Enable output by the user program. At System Reset, the Watchdog mode is disabled. Note: This bit is ignored if the Hardware Watchdog option is enabled by pin HW0SW1 (if available). EXTERNAL INTERRUPT VECTOR REGISTER (EIVR) R246 - Read/Write Register Page: 0 Reset value: xxxx 0110 (x6h)
7 x x x x x TLIS IA0S 0 x
Bit 2 = TLIS: Top Level Input Selection. This bit is set and cleared by software. 0: Watchdog End of Count is TL interrupt source 1: NMI is TL interrupt source Bit 1 = IA0S: Interrupt Channel A0 Selection. This bit is set and cleared by software. 0: Watchdog End of Count is INTA0 source 1: External Interrupt pin is INTA0 source Warning: To avoid spurious interrupt requests, the IA0S bit should be accessed only when the interrupt logic is disabled (i.e. after the DI instruction). It is also necessary to clear any possible interrupt pending requests on channel A0 before enabling this interrupt channel. A delay instruction (e.g. a NOP instruction) must be inserted between the reset of the interrupt pending bit and the IA0S write instruction. Other bits are described in the Interrupt section.
WAIT CONTROL REGISTER (WCR) R252 - Read/Write Register Page: 0 Reset value: 0111 1111 (7Fh)
7 x WDGEN x x x x x 0 x
Bit 6 = WDGEN: Watchdog Enable (active low). Resetting this bit via software enters the Watchdog mode. Once reset, it cannot be set anymore
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ST92185B - STANDARD TIMER (STIM)
7.2 STANDARD TIMER (STIM) Important Note: This chapter is a generic description of the STIM peripheral. Depending on the ST9 device, some or all of the interface signals described may not be connected to external pins. For the list of STIM pins present on the particular ST9 device, refer to the pinout description in the first section of the data sheet. 7.2.1 Introduction The Standard Timer includes a programmable 16bit down counter and an associated 8-bit prescaler with Single and Continuous counting modes capability. The Standard Timer uses an input pin (STIN) and an output (STOUT) pin. These pins, when available, may be independent pins or connected as Alternate Functions of an I/O port bit. STIN can be used in one of four programmable input modes: - event counter, - gated external input mode, Figure 47. Standard Timer Block Diagram
n
- triggerable input mode, - retriggerable input mode. STOUT can be used to generate a Square Wave or Pulse Width Modulated signal. The Standard Timer is composed of a 16-bit down counter with an 8-bit prescaler. The input clock to the prescaler can be driven either by an internal clock equal to INTCLK divided by 4, or by CLOCK2 derived directly from the external oscillator, divided by device dependent prescaler value, thus providing a stable time reference independent from the PLL programming or by an external clock connected to the STIN pin. The Standard Timer End Of Count condition is able to generate an interrupt which is connected to one of the external interrupt channels. The End of Count condition is defined as the Counter Underflow, whenever 00h is reached.
INEN INMD1 INMD2 INPUT & (See Note 2) CLOCK CONTROL LOGIC INTCLK/4 CLOCK2/x OUTMD1 OUTMD2 STOUT1 OUTPUT CONTROL LOGIC EXTERNAL INTERRUPT 1 INTERRUPT CONTROL LOGIC INTS MUX STANDARD TIMER CLOCK STP 8-BIT PRESCALER STH,STL 16-BIT DOWNCOUNTER
STIN1
END OF COUNT
INTERRUPT REQUEST Note 1: Pin not present on all ST9 devices. Note 2: Depending on device, the source of the INPUT & CLOCK CONTROL LOGIC block may be permanently connected either to STIN or the RCCU signal CLOCK2/x. In devices without STIN and CLOCK2, the INEN bit must be held at 0.
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ST92185B - STANDARD TIMER (STIM)
STANDARD TIMER (Cont'd) 7.2.2 Functional Description 7.2.2.1 Timer/Counter control Start-stop Count. The ST-SP bit (STC.7) is used in order to start and stop counting. An instruction which sets this bit will cause the Standard Timer to start counting at the beginning of the next instruction. Resetting this bit will stop the counter. If the counter is stopped and restarted, counting will resume from the value held at the stop condition, unless a new constant has been entered in the Standard Timer registers during the stop period. In this case, the new constant will be loaded as soon as counting is restarted. A new constant can be written in STH, STL, STP registers while the counter is running. The new value of the STH and STL registers will be loaded at the next End of Count condition, while the new value of the STP register will be loaded immediately. WARNING: In order to prevent incorrect counting of the Standard Timer, the prescaler (STP) and counter (STL, STH) registers must be initialised before the starting of the timer. If this is not done, counting will start with the reset values (STH=FFh, STL=FFh, STP=FFh). Single/Continuous Mode. The S-C bit (STC.6) selects between the Single or Continuous mode. SINGLE MODE: at the End of Count, the Standard Timer stops, reloads the constant and resets the Start/Stop bit (the user programmer can inspect the timer current status by reading this bit). Setting the Start/Stop bit will restart the counter. CONTINUOUS MODE: At the End of the Count, the counter automatically reloads the constant and restarts. It is only stopped by resetting the Start/Stop bit. The S-C bit can be written either with the timer stopped or running. It is possible to toggle the S-C bit and start the Standard Timer with the same instruction. 7.2.2.2 Standard Timer Input Modes (ST9 devices with Standard Timer Input STIN) Bits INMD2, INMD1 and INEN are used to select the input modes. The Input Enable (INEN) bit ena-
bles the input mode selected by the INMD2 and INMD1 bits. If the input is disabled (INEN="0"), the values of INMD2 and INMD1 are not taken into account. In this case, this unit acts as a 16-bit timer (plus prescaler) directly driven by INTCLK/4 and transitions on the input pin have no effect. Event Counter Mode (INMD1 = "0", INMD2 = "0") The Standard Timer is driven by the signal applied to the input pin (STIN) which acts as an external clock. The unit works therefore as an event counter. The event is a high to low transition on STIN. Spacing between trailing edges should be at least the period of INTCLK multiplied by 8 (i.e. the maximum Standard Timer input frequency is 3 MHz with INTCLK = 24MHz). Gated Input Mode (INMD1 = "0", INMD2 = "1") The Timer uses the internal clock (INTCLK divided by 4) and starts and stops the Timer according to the state of STIN pin. When the status of the STIN is High the Standard Timer count operation proceeds, and when Low, counting is stopped. Triggerable Input Mode (INMD1 = "1", INMD2 = "0") The Standard Timer is started by: a) setting the Start-Stop bit, AND b) a High to Low (low trigger) transition on STIN. In order to stop the Standard Timer in this mode, it is only necessary to reset the Start-Stop bit. Retriggerable Input Mode (INMD1 = "1", INMD2 = "1") In this mode, when the Standard Timer is running (with internal clock), a High to Low transition on STIN causes the counting to start from the last constant loaded into the STL/STH and STP registers. When the Standard Timer is stopped (ST-SP bit equal to zero), a High to Low transition on STIN has no effect. 7.2.2.3 Time Base Generator (ST9 devices without Standard Timer Input STIN) For devices where STIN is replaced by a connection to CLOCK2, the condition (INMD1 = "0", INMD2 = "0") will allow the Standard Timer to generate a stable time base independent from the PLL programming.
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ST92185B - STANDARD TIMER (STIM)
STANDARD TIMER (Cont'd) 7.2.2.4 Standard Timer Output Modes OUTPUT modes are selected using 2 bits of the STC register: OUTMD1 and OUTMD2. No Output Mode (OUTMD1 = "0", OUTMD2 = "0") The output is disabled and the corresponding pin is set high, in order to allow other alternate functions to use the I/O pin. Square Wave Output Mode (OUTMD1 = "0", OUTMD2 = "1") The Standard Timer toggles the state of the STOUT pin on every End Of Count condition. With INTCLK = 24MHz, this allows generation of a square wave with a period ranging from 333ns to 5.59 seconds. PWM Output Mode (OUTMD1 = "1") The value of the OUTMD2 bit is transferred to the STOUT output pin at the End Of Count. This allows the user to generate PWM signals, by modifying the status of OUTMD2 between End of Count events, based on software counters decremented on the Standard Timer interrupt. 7.2.3 Interrupt Selection The Standard Timer may generate an interrupt request at every End of Count. Bit 2 of the STC register (INTS) selects the interrupt source between the Standard Timer interrupt and the external interrupt pin. Thus the Standard Timer Interrupt uses the interrupt channel and takes the priority and vector of the external interrupt channel. If INTS is set to "1", the Standard Timer interrupt is disabled; otherwise, an interrupt request is generated at every End of Count. Note: When enabling or disabling the Standard Timer Interrupt (writing INTS in the STC register) an edge may be generated on the interrupt channel, causing an unwanted interrupt. To avoid this spurious interrupt request, the INTS bit should be accessed only when the interrupt log-
ic is disabled (i.e. after the DI instruction). It is also necessary to clear any possible interrupt pending requests on the corresponding external interrupt channel before enabling it. A delay instruction (i.e. a NOP instruction) must be inserted between the reset of the interrupt pending bit and the INTS write instruction. 7.2.4 Register Mapping Depending on the ST9 device there may be up to 4 Standard Timers (refer to the block diagram in the first section of the data sheet). Each Standard Timer has 4 registers mapped into Page 11 in Group F of the Register File In the register description on the following page, register addresses refer to STIM0 only.
STD Timer Register STIM0 STH0 R240 STL0 R241 STP0 R242 STC0 R243 STIM1 STH1 R244 STL1 R245 STP1 R246 STC1 R247 STIM2 STH2 R248 STL2 R249 STP2 R250 STC2 R251 STIM3 STH3 R252 STL3 R253 STP3 R254 STC3 R255 Register Address (F0h) (F1h) (F2h) (F3h) (F4h) (F5h) (F6h) (F7h) (F8h) (F9h) (FAh) (FBh) (FCh) (FDh) (FEh) (FFh)
Note: The four standard timers are not implemented on all ST9 devices. Refer to the block diagram of the device for the number of timers.
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ST92185B - STANDARD TIMER (STIM)
STANDARD TIMER (Cont'd) 7.2.5 Register Description COUNTER HIGH BYTE REGISTER (STH) R240 - Read/Write Register Page: 11 Reset value: 1111 1111 (FFh)
7 ST.15 ST.14 ST.13 ST.12 ST.11 ST.10 ST.9 0 ST.8
STANDARD TIMER CONTROL (STC) R243 - Read/Write Register Page: 11 Reset value: 0001 0100 (14h)
7 ST-SP S-C INMD1 INMD2 INEN
REGISTER
0 INTS OUTMD1 OUTMD2
Bits 7:0 = ST.[15:8]: Counter High-Byte. COUNTER LOW BYTE REGISTER (STL) R241 - Read/Write Register Page: 11 Reset value: 1111 1111 (FFh)
7 ST.7 ST.6 ST.5 ST.4 ST.3 ST.2 ST.1 0 ST.0
Bit 7 = ST-SP: Start-Stop Bit. This bit is set and cleared by software. 0: Stop counting 1: Start counting Bit 6 = S-C: Single-Continuous Mode Select. This bit is set and cleared by software. 0: Continuous Mode 1: Single Mode Bits 5:4 = INMD[1:2]: Input Mode Selection. These bits select the Input functions as shown in Section 0.1.2.2, when enabled by INEN.
INMD1 0 0 1 1 INMD2 0 1 0 1 Mode Event Counter mode Gated input mode Triggerable mode Retriggerable mode
Bits 7:0 = ST.[7:0]: Counter Low Byte. Writing to the STH and STL registers allows the user to enter the Standard Timer constant, while reading it provides the counter's current value. Thus it is possible to read the counter on-the-fly. STANDARD TIMER PRESCALER REGISTER (STP) R242 - Read/Write Register Page: 11 Reset value: 1111 1111 (FFh)
7 0
STP.7 STP.6 STP.5 STP.4 STP.3 STP.2 STP.1 STP.0
Bit 3 = INEN: Input Enable. This bit is set and cleared by software. If neither the STIN pin nor the CLOCK2 line are present, INEN must be 0. 0: Input section disabled 1: Input section enabled Bit 2 = INTS: Interrupt Selection. 0: Standard Timer interrupt enabled 1: Standard Timer interrupt is disabled and the external interrupt pin is enabled. Bits 1:0 = OUTMD[1:2]: Output Mode Selection. These bits select the output functions as described in Section 0.1.2.4.
OUTMD1 0 0 1 OUTMD2 0 1 x Mode No output mode Square wave output mode PWM output mode
Bits 7:0 = STP.[7:0]: Prescaler. The Prescaler value for the Standard Timer is programmed into this register. When reading the STP register, the returned value corresponds to the programmed data instead of the current data. 00h: No prescaler 01h: Divide by 2 FFh: Divide by 256
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ST92185B - DISPLAY STORAGE RAM INTERFACE
7.3 DISPLAY STORAGE RAM INTERFACE 7.3.1 Introduction The Display RAM (TDSRAM) is used to hold the OSD data for display. It can be shared by the following units: - Display Unit (DIS). This OSD generator is described in a separate chapter. - CPU accesses for control. Figure 48. General Block Diagram The necessary time slots are provided to each unit for realtime response. FEATURES: s Memory mapped in CPU Memory Space s Direct CPU access without significant slowdown
VR02094B
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ST92185B - DISPLAY STORAGE RAM INTERFACE
TDSRAM (Cont'd) 7.3.2 Functional Description The Data Storage RAM Interface (TRI) manages the data flows between the different sub-units (display and CPU interface) and the internal RAM. A specific set of buses (8 bit data TRIDbus, 13 bit address TRIAbus) is dedicated to these data flows. As this TDSRAM interface has to manage TV oriented real time signals (On-Screen-Display): - Its timing generator uses the same frequency generator as for the Display (Pixel frequency multiplier), - Its controller is hardware synchronized to the basic horizontal and vertical sync signals got through the CSYNC Controller, - Its architecture gives priority to the TV real time constraints: whenever there is any access contention between the CPU (only in case of direct CPU access) and one of the hardware units, the CPU automatically enters a "wait" configuration until its request is serviced.
7.3.2.1 TV Line Timesharing During a TV line, to maintain maximum performance, a continuous cycle is run repetitively. This cycle is divided in 8 sub-cycles called "slots". This 8-slot cycle is repeated continuously until the next TV line-start occurs (horizontal sync pulse detected). When a horizontal sync pulse is detected, the running slot is completed and the current cycle is broken. The following naming convention is used: "CPU" stands for direct CPU access slot, "DIS" stands for Display reading slot. Each slot represents a single byte exchange (read or write) between the TDSRAM memory and the other units: Display Reading (DIS). 1 byte is read from the TDSRAM and sent to the display unit, the address being defined by the display address generator. CPU Access (CPU). 1 byte is exchanged (read or written) between the TDSRAM and the CPU, the address being defined by the CPU address bus.
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ST92185B - DISPLAY STORAGE RAM INTERFACE
TDSRAM (Cont'd) 7.3.3 Initialisation 7.3.3.1 Clock Initialisation Before initialising the TRI, first initialise the pixel clock. Refer to the Application Examples in the OSD chapter and to the RCCU chapter for a description of the clock control registers. 7.3.3.2 TRI Initialisation It is recommended to wait for a stable clock issued from the Pixel frequency multiplier before enabling the TDSRAM interface.
Use the CONFIG register to initialise and start the TRI. Note: The DON bit can only be changed while GEN=0 Example: spp #0x26 ld config, #0x02 ; DON,GEN=0 or config, #0x01 ; set GEN=1 During and after a reset, the TDSRAM interface is forced into its "disable" mode where the sequencer is forced into its idle state.
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ST92185B - DISPLAY STORAGE RAM INTERFACE
TDSRAM (Cont'd) 7.3.4 Register Description RAM INTERFACE CONFIGURATION REGISTER (CONFIG ) R252 - Read/Write Register Page: 38 Reset Value: 0000 0010 (02h)
7 0 0 0 0 0 0 0 DON GEN
Bit 7:2 = Reserved, keep in reset state.
Bit 1 = DON: Display ON/OFF. 0: No display reading allowed (display slot completely used for CPU access). 1: Display reading enabled during the respective access slot. Note: DON can be changed only when the TRI is off (GEN = 0). < Bit 0 = GEN: RAM Interface General Enable. 0: TRI off. Display reading and CPU accesses are not allowed. When GEN=0, the Automatic Wait Cycle insertion, while trying to access the TDSRAM, is disabled. 1: TRI on.
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ST92185B - ON SCREEN DISPLAY (OSD)
7.4 ON SCREEN DISPLAY (OSD) 7.4.1 Introduction The OSD displays Teletext or other character data and menus on a TV screen. In serial mode, characters are coded on one byte. The display is fully compliant with the WST Teletext level 1.5. In parallel mode, characters are coded on two bytes, one byte being the font address (character code), the second byte being used for attribute control, which can be combined with the serial attribute capabilities. In this mode, the display meets a significant part of the WST Teletext level 2 specification. In order to save memory resources (reduce system cost), two display modes are provided with either a page mode display mode (teletext standard, 26 rows) or a line mode (up to 12 rows) for non teletext specific menus. The OSD is seen by the ST9 as a peripheral which has registers mapped in the Paged Register space. The character codes to be displayed are taken from the TDSRAM memory. They are addressed by the display with the real time sequencer through the TDSRAM interface character by character. The font ROM contains 512 characters. The standard European font contains all characters required to support Eastern and Western European languages. Each character can be defined by the user with the OSD Screen/Font Editor. All fonts (except the G1 mosaic font) are fully definable by masking the pixel ROM content. Display is done under control of the ST9 CPU and the vertical and horizontal TV synchro lines. The OSD provides the Red, Green, Blue signals and the Fast Blanking switching signal through four analog outputs. The three Color outputs use a 3-level DAC which can generate half-intensity colors in addition to the standard saturated colors. The Display block diagram is shown on Figure 1. A smart pixel processing unit provides enhanced features such as rounding or fringe for a better picture quality. Other smart functions such as true Scrolling and cursor modes allow designing a high quality display application. 7.4.2 General Features s Serial Character Mode supporting Teletext level 1.5 s Parallel Character Mode for TV character displays (for example channel selection or volume control menus) s 40 or 80 characters/row s Full Page Mode: 23 rows plus 1 Header and 2 Status Rows s Line Mode: Up to 12 rows plus 1 Header and 2 Status Rows. s 4/3 or 16/9 screen format s Synchronization to TV deflection, by Hsync and Vsync or Csync. s Box Mode: Display text inside and outside box solid, transparant or blank s Rounding and Fringing s Cursor Control s Concealing s Scrolling s Semi-transparent mode (text windowing inside video picture) s Half-Tone mode (reduces video intensity inside a box) s Normal character size 10 x 10 dots. s Other character sizes available as follows:
(SH: Single Height, SW: Single Width, DH: Double Height, DW: Double Width, DS: Double Size) Both Serial and Parallel Mode SH x SW = 10 * 10 dots DH x SW = 20 * 10 dots Parallel Display Mode only SH x DW = 10 * 20 dots DS=DH x DW = 20 * 20 dots
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ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont'd) s Serial character attributes: - Foreground Color (8 possibilities in Serial Full page display mode) - Background Color (8 possibilities) - Flash / Steady - Start Box / End Box - Double height - Conceal / display - Fringe - Contiguous Mosaic / Separated Mosaic - Hold / Release Mosaic - G0 font switch (in triple G0 mode) s Parallel character attributes (in parallel display mode): - Underline - Double height & Double width - Upper Half-Character - Smooth Rounding - Box mode - Font Selection G0/Extended menu - Selection of 15 background Colors - Selection of 8 foreground Colors s Global Screen attributes: - Fine and coarse Horizontal Adjustment (for the whole 26 rows) - Vertical Adjustment (for the whole page) - Blanking Adjustment - Default Background Color (up 15 colors with use of half-intensity attribute) - Default Foreground Color (up 15 colors with use of half-intensity attribute) - Semi transparent display (active only on background) - Translucency: OSD background color mixed with video picture. - Full screen Color (15)
s
s
s
- National Character set selection - National Character mode selection - Global Double Height display (Zooming Function) - Global Fringe Enable - Global Rounding Enable Cursor Control: - Horizontal position (by character) - Vertical position (by row) - Flash, Steady or Underline Cursor Modes - Color Cursor with inverted foreground / inverted background Scrolling Control: - Vertical scrolling available: Programmable rolling window if Normal Height and 40 char/row - Top-Down or Bottom-Up shift - Freeze Display Character fonts: 576 different characters available: - 128 mosaic matrix characters (G1), hardware defined (64 contiguous, 64 separated). - 512 character ROM fonts, all user defined: - 96-character basic character set (G0) - 128 characters shared between G2 X/26 and Menu characters - 96 Extended Menu Characters - Two national character set modes (mutually exclusive ROM options): Single G0 mode A font combining 83 characters from the G0 basic set (latin) and 13 characters selected from 15 National character subsets Triple G0 mode allowing different alphabets Three 96-character fonts (e.g. latin, arabic, cyrillic ...)
G2 (X26+ Menu) 128 128 Extended Menu 96 96 G1 (mosaic) 64 64
Mode Triple G0 Single G0
G0 3*96 1*83
National Set N/A 15*13
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ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont'd) Figure 49. Display Block Diagram
RAM INTERFACE Gen RAM Add Row Counter Comp 10/20 Comp VPOS Char Counter Comp HPOS Comp 10/20 RAM @
Line Counter Scroll N Row Scroll 1 Row SCROLLING CONTROL CURSOR CONTROL
Pixel Counter HPOS VPOS Char Cursor
Gen PLA Cmd MOSAIC PLA
Gen ROM Add
Row Cursor Mode Ctrl
ROM
PIXEL CONTROL Serial/Parallel Attributes
Shift Register (10b)
TSLU Full Screen R Def. Backg Def. Foreg Cur. Backg Pixel Control L1/L1+ mux mux Cur. Foreg L1/L1+ Fast Blanking TRB FB G B
Char Decoding
Attributes Decoding ST9 Access
Character Code
Parallel Attributes
On Hsync On Ckpix
RAM INTERFACE
VR02112E
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ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont'd) 7.4.3 Functional Description 7.4.3.1 Screen Display Area The screen is divided in 26 rows of basically 40 characters. From row 1 to row 23, it is possible to display 80 characters per row with the following restrictions: - Serial mode only - No rounding or fringe Figure 50. Definition of Displayed Areas
The three special rows, a Header and two Status rows have specific meanings and behaviour. They are always displayed the same way (40 characters) and at the same place. In these rows, size attributes, scrolling and 80-character modes are not allowed. All row content, including the Header and Status rows, is fully user-definable.
ROW 0 "HEADER"
26 LINES (TEXT PAGE)
"FULL SCREEN" AREA
ROW 24 "STATUS ROW 0" ROW 25 "STATUS ROW 1"
40/80 CHARACTERS
Figure 51. Screen Display Area.
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ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont'd) 7.4.3.2 Color Processing The color of any pixel on screen is the result of a priority processing among several layers which are (going from the lowest priority to the highest one): s Full Screen Color where nothing is processed s Default Background Color (it assumes pixel is off) s Serial Background Color (pixel off, but background color serial attributes activated) s Parallel Background Color (pixel off, but background color parallel attribute activated) s Default Foreground Color (pixel on, but no foreground attribute activated) s Serial Foreground Color (pixel on and foreground serial attribute activated) s Parallel Foreground Color (pixel on and foreground parallel attribute activated) Color processing is also the result of register control bits (for global color attributes) and color oriented attribute bits (from serial or parallel attributes), refer to the Figure 0.1.4.3 7.4.3.3 Pixel Clock Control The pixel clock is generated outside of the display macrocell by the on-chip Pixel Frequency multiplier which provides great frequency flexibility controlled by software (refer to the RCCU chapter). For example, reconfiguring the application from a 4/3 screen format to a 16/9 format is just a matter of increasing the pixel frequency (i.e. reprogramming the pixel frequency multiplier to its new value). The output signal of the pixel frequency multiplier is rephased by the Skew Corrector to be perfectly in phase with the horizontal sync signal which drives the display. 7.4.3.4 Display Character Each character is made up of a 10 x 10 dots matrix. All character matrix contents are fully user definable and are stored in the pixel ROM (except the G1 mosaic set which is hardware defined).
A set of colors defines the final color of the current pixel. In general, the character matrix content is displayed as it is, the pixel processing adding the shape and the color information received from the current attributes. Only three kinds of attributes alter the displayed pixel. They are the following: 7.4.3.5 Rounding Rounding can be enabled for the whole display using the GRE global attribute bit (See Figure 1) In this effect one half-dot is added in order to smooth the diagonal lines. This processing is built into the hardware. The half-dot is painted as foreground. This half-dot is field-sensitive for minimum vertical size (Figure 4). An extra `smooth rounding' capability is also builtin (see Figure 5). In smooth rounding, a pixel is added even if dots make an `L'. This capability is activated using a parallel attribute (See Table 4) 7.4.3.6 Underline In this effect the last TV line of the character is displayed as foreground (Figure 4). 7.4.3.7 Fringe The fringe is a half-dot black border surrounding completely the character foreground. This half-dot is field sensitive for minimum vertical size (Figure 4). 7.4.3.8 Translucency Certain video processors are able to mix the RGB and video signals. This function of the chroma processor is then driven by the TSLU output pin of the ST9 device. See Figure 7. 7.4.3.9 Half-Tone If the HT signal is activated, for example, while a text box is displayed and a transparant background selected for all the display (MM bit =1 in the FSCCR register), the HT signal performs a contrast reduction to the background inside the box. See Figure 8.
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ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont'd) Figure 52. Display Character scheme
NORMAL MODE
ROUNDING MODE
FRINGE MODE Background Foreground Fringe
Background Foreground Smooth Rounding Underline
VR02112B
Figure 53. Rounding and Fringe Effects
Dot (four pixels) Added pixel Added pixel
Added pixel
Smooth Rounding Effect
Global Rounding Effect
Fringe Effect
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ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont'd) 7.4.4 Programming the Display All the characteristics of the display are managed by programmable attributes: s Global Attributes s Serial Attributes s Parallel Attributes (active until a superseding serial or parallel attribute). Table 15. Global Attributes
Global Attributes Display Enable (DE) 0= Display Off (Default) 1= Display On 0= 4/3 Screen Format (Default)
Cursor Control Scrolling Control 7.4.4.1 Global Attributes These global attributes are defined through their corresponding registers (see the Register Description).
s s
Description
Control Register DCM0R R250 (FAh) Page 32 DCM0R DCM0R
4/3 or 16/9 Format (SF) Conceal Enable (CE)
1= 16/9 Screen Format 0= Reveal any text defined as concealed by serial attributes (Default) 1= Conceal any text defined as concealed by serial attributes 0= Fringe Disabled (Default) 1= If SWE in NCSR register is reset, it acts as Fringe enable (toggle with serial attribute 1Bh). Active on the whole page but not in 80-character mode. 0= Global fringe mode off 1= Display all text in page in fringe mode 0= Disabled (Default) 1= Rounding active on the whole page but not in 80-character mode. 0=Disabled (default) 1=Enabled
Fringe Enable (FRE)
DCM0R
Global Fringe Enable (GFR) Global Rounding Enable (GRE)
DCM0R DCM0R
Semi-transparent Mode (STE)
The Fast Blanking signal is toggled with the double pixel clock rate on Back- DCM0R ground and full screen area in 40 character mode. Note: Semi-transparent mode shows a visible grid on screen.
NCSR R245 The TSLU signal is active when the OSD displays the background and full (F5h) Page Translucency (HTC and screen area and is inactive during foreground or if no display. This output 32 and FSCTSLE) pin is used with a Chroma processor to mix the video input with the RGB to CR R243 get full translucency. Page 32 NCSR R245 (F5h) Page The HT signal is active when the OSD displays the background and full Half-Tone (HTC and TSLE) screen area and is inactive during foreground or if no display. The HT signal 32 and FSCCR R243 is used with a video processor to perform a contrast reduction. Page 32 0=Single page (40 Characters per row) (default) 40/80 Chars/Row (S/D) 1= Two pages are displayed contiguously (80 Characters per row). In this DCM0R mode, only serial mode is available. DCM1R 0=Display when Fast Blanking output is low (default) Fast Blanking Active Level R251 (FBh) 1=Display when Fast Blanking output is high Page 32 0= Serial Mode (Default) Serial/Parallel Mode (SPM) DCM1R 1= Parallel Mode Page or Line Display Mode 0 = Full Page Mode (Default) 23 lines plus 1 header and two status lines. DCM1R (PM) 1= Line Mode
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ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont'd) Table 16. Global Attributes (Cont'd)
Global Attributes Box Control ModeText In/ Out Control Register FSCCR Text In/ Text Out Box configurable with 3 bits. Refer to FSCCR register deR243 (F3h) scription for details. Page 32 Refer to the register description for bit settings. Active on the whole page, VPOSR this setting adjusts the vertical delay between the rising edge of Vsync and R242 (F2h) the beginning of the display area. The display color in this delay adjustment Page 32 area is defined by the Full Screen color. Refer to the register description for bit settings. Active on the whole page, this adjustment is the horizontal delay between the rising edge of Hsync and the beginning of the display area. The display in this delay area is the HPOSR full row color. R241 (F1h) Two kinds of horizontal adjustment are available. When the tube is in a 4/3 Page 32 format, only a horizontal delay is necessary before starting the active display area. When the tube is in 16/9 format, an additional horizontal adjustment is necessary to keep the display area centered on the screen. NCSR R245 Refer to the register description for bit settings. Chooses which national font (F5h) Page sub-set is to be used with the G0 character set. 32 0 = Single G0 character set mode (default) Description
Vertical Adjustment
Horizontal Adjustment
National Character Subset Selection
Single G0 or Triple G0 mode 1 = Triple G0 character set mode NCSR selection In applications with multiple alphabets in the same display, it is possible to switch from one character set to another on the fly (see serial attributes). SCLR R248 (F8h) Active on the whole page with header, but not on the status rows. When Global Double Height Global Double Height is active, either the top half or the bottom half of the and SCHR R249 (F9h) screen is visible. Page 32 DCR R240 This color is displayed as background color if no serial or parallel attributes (F0h) Page Background default color are defined for the displayed row. 33 This color is displayed as foreground color if no serial or parallel attributes Foreground default color are defined for the displayed row. These default colors are selected at each DCR beginning of a line and are defined by means of the corresponding register. FSCCR Full screen color Color displayed outside of the vertical display area. R243 (F3h) Page 32
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ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont'd) Figure 54. Semi-Transparent Display Scheme and Fast Blanking Behaviour
NORMAL DISPLAY SEMI TRANSPARENT DISPLAY
line 3 Field odd line 4 Field even
Fringe Solid Background Solid Foreground + Rounding Video
LINE 3 NORMAL DISPLAY
CKPIX R, G, B FB R, G, B
LINE 3 SEMI TRANSPARANT DISPLAY
CKPIX FB VIDEO
RGB
LINE 4 NORMAL DISPLAY
CKPIX R, G, B FB R, G, B
LINE 4 SEMI TRANSPARANT DISPLAY
CKPIX
FB
VR02112C
Figure 55. Translucent Display Scheme
line 3
Fringe Solid Background Solid Foreground + Rounding Video
NORMAL DISPLAY LINE 3 CKPIX R, G, B(40c) FB TSLU VR02112J
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ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont'd) Figure 56. Half-Tone Display Scheme
VIDEO PROCESSOR RGB Switch Internal Red Internal Green Internal Blue Contrast Reduction Rout Gout Bout
HT
R G B FB
ST9 MCU
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ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont'd) 7.4.4.2 Row Attributes The header and status row attributes are set using the HSCR R244 (F4h) Page 32 register. The row enable bits as set in registers DE0R .. 2 R253 ..255 Page 32. Header Enable When the display is in line mode, row 0, called the header, is also usable. It no longer acts as a header but simply as an additional row. Status Row Enable The display of the two status rows can be enabled individually.
Row Enable Bits 1 bit per row, for rows from 1 to 23, in page mode. Serial Attributes Serial Mode is selected by resetting the SPM bit in register DCM1R R251 (FBh) Page 32. Serial attributes are active until the end of the line or a superseding serial attribute. In this display mode, the attribute code and the character code are in the same memory area (Figure 9). The attribute takes the place of an alpha character, and the OSD displays a space character defined on 1 byte in Serial Mode:
Figure 57. Example of a Row in Serial Mode
FLASHING
Display
AA
Z A RDOZ
Propagation
AAA
can be half intensity global Default background Default foreground
Memory location
Length of row = 40 Characters
AA
Fh Sc Bb
Z A RDOZ
Sty
AAA
Characters Steady attribute Black background attribute Foreground color attribute Flashing attribute VR02115A
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ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont'd) Table 17. Serial Attribute Codes
b[7:3] b[2:0] Foreground Color 000 001 010 011 100 101 110 111 (Alpha Chars) Black Red Green Yellow Blue Magenta Cyan White (1) Flash Steady (1, 2) Box OFF (1) Box ON Normal Height (1,2) Double Height Foreground Color (Mosaic Chars) Black (3) Red Green Yellow Blue Magenta Cyan White Conceal (2) Contiguous Mosaic (1, 2) Separated Mosaic (2) Fringe or 2nd G0 font (3, 4) Black Background (1, 2) New Background (2) Hold Mosaic (2) Release Mosaic (1) 00000 00001 00010 00011
Notes: (1) Presumed at the start of each display row or can be defined in global register (2) Action "set at" (on current character) others are "set after" (on next character) (3) ALWAYS active (even in Full Page Serial Mode, i.e. for Text Level 1) (4) Toggles action if the Fringe Enable is set (bit 5 in register DCM0R R250 (FAh) Page 32. Selects a second G0 if the Switch Enable bit is set (bit 5 in register NCSR R245 (F5h) Page 32) Flash: (/= Steady) The next characters are displayed with the foreground color alternatively equal to background and foreground on a period based on Vsync (32 Vsync: foreground, 16 Vsync: background) until a Steady serial attribute. Fringe: If the Fringe Enable bit is set in the global attribute register DCM0R R250 (FAh) Page 32, the next characters are displayed with a black fringe (half dot) until the decoding of another fringe attribute coded 1Bh (toggle effect). Conceal: (/= Reveal) The next characters are displayed as space characters (Background color) until a foreground color character is encountered. Conceal mode is set by the conceal enable control bit in the register DCM0R R250 (FAh) Page 32. Boxing: A part of the page (where this bit is active) is inserted in a specific window depending on 3 control bits defined in the FSCCR register. (see Figure 11)
To respect the Teletext Norm, the box in serial mode, starts when two Box-on attributes are encountered, and stops when two Box-offs are encountered. Double Height: The upper halves of the characters are displayed in the current row, the corresponding lower halves of characters are displayed (with same display attributes) in the next row (information received for this row must be ignored). Note: When a serial double height attribute is decoded in Row 23, the characters of the first status row are not displayed. To avoid this effect, remove the serial double height attribute from Row 23. Figure 58. Mosaic Characters
Contiguous Mosaic
Separated Mosaic
Note: Hold Mosaic: (/= Release) The last mosaic character is repeated once instead of the current space character.
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ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont'd) Figure 59. Example of Boxing Attribute in Serial Mode
TEXT outside box not displayed* Display TEXT inside box is visible*
Propagation
Default background
>
Memory location
Length of row = 40 Characters
AA
Bb BO BO
>
BF BF SC Nb
A
BOX-ON attribute BOX-OFF attribute
Default foreground *Depending on FSCCR
VR02115B
Figure 60. Example of Double Height Attribute in Serial Mode
3 contiguous Rows displayed in serial mode
Display
ABC AA
Z A R D OZ
Z A RDOZ
FLASHING
DEF AAA
on screen, the 2nd line is overlapped
Memory Location
ABC 123 A A Fh
.
DH
Sc Bb
Z A R D O Z NS D E F HI DDEN 4 5 6 Z A R D O Z Sty A A A
VR02115C
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ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont'd) 7.4.4.3 Parallel Attributes Figure 61. Example of Row in Parallel Mode
Display
A A A * * Z A RDOZ * A A A
Default foreground Default background
global
Propagation
Foreground (full intensity) Background (half intensity)
Attributes Location
Characters Location
A A A * * Z A RDOZ * A A A
VR02115D
Each character is defined on 2 bytes in Parallel Mode (see Figure 13.) Parallel Mode is selected by setting the SPM bit in the DCM1R register R251 (FBh) Page 32. It requires 2 bytes per character. Display characters are coded through a second byte processed in parallel with the character code. It does not handle Teletext and is used mainly for TV menus (e.g. for channel searching or volume control). The attribute can be one of two types defined by most significant bit (PS): - Color attribute - Shape attribute US: Underline / Separate Mosaic graphics (see above). DH: Double Height: The half character is displayed in the current row depending on the Upper Height
control bit. The Double Height action is not propagated in the row. Note: When a parallel double height attribute is decoded in Row 23, the characters of the first status row are not affected and are still displayed. UH: Upper Half. This bit is active when the currently displayed row writes the upper half-character in case of double height or double size attribute. DW: Double Width (see above). BX: Boxing window. SR: Smooth Rounding. FR, FG, FB: Foreground color. BR, BG, BB: Background color. HI: Half Intensity (background only). CSS: Character extended menu code selection. PS: Parallel attribute selection
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ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont'd) Table 18. Parallel Color and Shape Attributes.
BIT 0 1 2 3 4 5 6 7 NAME BR BG BB HI FR FG FB PS= 0 FUNCTION Background Red Background Green Background Blue Half-Intensity Foreground Red Foreground Green Foreground Blue Parallel Attribute Selection REMARKS
Only for Background.
Color mode of parallel attributes G2-Menu characters or G1/Extended menu characters selection Dual function depending on character code The character is 20 pixels high . The character is 20 pixels wide. Available in Parallel mode or in Line mode. Characters are stretched horizontally, to occupy in addition, the next character space. It is possible to mix it with double height. To display a double width character the attribute must be "double width" on the character and "simple width" on the next which can be a serial attribute. In this case the first character is memorised. If two "double width" attributes are on two adjacent characters, the first half of the second is displayed instead of the second half of the first one. Active only if Double Height or Size requested Boxing window created (if 1) Special rounding effect (See Figure 5) Shape mode of parallel attributes
0 1 2
CSS US DH
Character set selection Underline/Seperated mosaic Double height
3
DW
Double width
4 5 6 7
UH BX SR PS= 1
Upper half character (if 1) Box mode Smooth rounding Parallel Attribute Selection
Double Size: (available in Parallel mode or in Line mode) by setting Double Width plus Double Height attributes. Figure 62. Parallel Color and Shape Attributes
Attribute location Character location
DW SS 31 4F 31 88 80
AB
AB
AB
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A
B
VR02115E
ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont'd) 7.4.4.4 Font Selection using Parallel Attributes Parallel attributes have an immediate effect. They are applied to the associated character. These attributes can also have a "serial" effect, the defined attribute being still defined on the following characters: this is known as attribute propagation. Shape attributes (US,DH,BX,SR) are propagated when PS is toggled to 0. In the same way, color attributes are propagated when PS is toggled to 1. Table 19. Font Selection using Parallel Attributes
Parallel Attribute PS= 0 Character Code 00..1F 20..7F 80..FF 00..1F 20..7F 80..FF
CSS has two kinds of behaviour: - If PS is set once, the CSS attribute is applied on the current character only. - If PS is set twice, the CSS of the first character with PS=1 is propagated. Note: The value stored as a preceding CSS value is forced when alpha or mosaic color serial attributes are used. Alpha serial attributes reset the memorized CSS: Mosaic serial attributes set the memorized CSS.
Character
PS= 1 CSS used for character set selection
Definition 32 Control Characters (serial attributes function table) 96 Basic Characters chosen from G0 or G1 font 128 extended characters G2-based X/26 and Menu Characters 32 Control Characters (serial attributes function table) CSS= 0: G0 or G1 selection depending on color serial attribute CSS= 1: G1 selection CSS= 0: Select G2-based X/26 + Menu CSS= 1: Select extended Menu + 32 reserved characters
In the example in Table 6,, a string of six characters is displayed. In the line "Display with" we can see that, starting from Char(n) and ending with Char n+2, the CSS setting made at Char (n-2) is propagated. Table 20. Example of Character Set Selection
PS= CSS= Display with Stored CSS Char(n-2) 1 CSSn-2 CSSn-2 CSSn-2 Char(n-1) 1 CSSn-1 CSSn-1 CSSn-2 Char(n) 0 none CSSn-2 CSSn-2 Char(n+1) 0 none CSSn-2 CSSn-2 Char(n+2) 1 CSSn+2 CSSn+2 CSSn-2 Char(n+3) 1 CSSn+3 CSSn+3 CSSn+2
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ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont'd) Figure 63. Parallel Mode Display Example 1 Showing Character and Attribute Byte Pairs:
RAM content in Parallel Mode Characters A A A A A NF X SA A I NF A A A B NF B NF I I A A
NC DW NC SS DW SS
Parallel Attribute
DS DH DH
SS NC SS NC
UH=1 DS UH=0
NC NC
UH=1 UH=1 DH DH UH =0 UH=0
NC NC
SS DW
NF : New Foreground (Serial Attribute) SA : Serial Attribute
SS : Simple Size b7 = 0
NC : New Colour b7 = 0 DS : Double Size b7 = 1
Display A A
DW : Double Width b7 = 1
AA A
A A
AB
A
VR02112F
Parallel Mode Display Example 2:
Me n u B a s s 1 T r eb l e
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ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont'd) 7.4.4.5 Rules When Using Size Attributes Secondary effects can be generated when the shape format is not respected. The 3 figures below describe the combination of parallel size attributes to obtain the different character sizes: * Double Width * Double Height * Double Size
7.4.4.6 Example of using Double Width Attribute In parallel mode, double width on character can be obtained using the following rule (Figure 16): It is important to set Double Width (bit 3 of the shape attribute) on the current character attribute and Single Size on the following one. The second character location can be either a serial attribute or another character. On the contrary, if a new color or a Double Width attribute is set in the second attribute location, the second part of the character is overlapped.
Figure 64. Double Width Examples
Double width
A
Double width
AB
first half of the second character is displayed
Attributes location Characters location
Double width
Simple size
Double width
New color
DW SS
DW NC
A
NF
New foreground (serial attribute)
AB
New foreground (parallel attribute)
1 ROW
1 ROW
VR02115G
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ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont'd) 7.4.4.7 Example of using Double Height Attribute In parallel mode, Double Height characters can be obtained as follows. The Double Height attribute concerns two consecutive rows. Repeat the charFigure 65. Double Height Example
acter to magnify in the two rows. Set Bit 2 DH of the shape attribute in the two locations and set or reset bit 4 UH to define if it is the top or bottom half-character.
Double height
Display
Previous/default color Double height upper half DH UH=1 DH UH=0 Double height lower half
AB
Shape Propagation with color
Attributs location Characters location
AB AB
2 ROWS
New color
VR02115H
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ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont'd) 7.4.4.8 Example of using Double Size Attribute In parallel mode, Double Size characters can be obtained as follows. This attribute concerns two consecutive rows. The character to magnify must Figure 66. Double Size Examples
Display
be repeated on the two rows. Bits 2 and 3 of the shape attribute must be set on the two locations. In addition bit 4 must be set or reset to define the top or bottom half-character.
Double size
A
Double size lower half Double Height DS UH=1 DS UH=0
Double size upper half
Attribute location
DH DH
Double Height
Character location
A A
NF NF
VR02115J
2 ROWS
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ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont'd) 7.4.4.9 Example of using Underline Attribute In parallel mode, the Underline mode on character can be obtained simply by setting the bit 1 `US' of the shape attribute. To underline double height Figure 67. Underline Example
characters, set the US bit on the attribute associated with the lower part of the character. The underline attribute is ignored in the upper halfcharacter.
Display
Double height
UL
DH DH UH=1 UH=1 DH DH UH=0 UH=0
Attribute location Underline (US=1) Character location
UL UL
2 ROWS
Underline (US=1)
VR02115K
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ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont'd) 7.4.4.10 Attribute Rules The default colors for foreground and background are defined through the register DCR R240 (F0h) Page 33. A display defined in parallel mode can accept a serial color attribute, and propagation is available until a new color attribute (serial or parallel) is encountered. s Rule for Shape Attributes: - In parallel mode, shape attributes are not propagated on the following characters of the row except if this character has a colour attribute. The propagation lasts as long as a colour attribute is applied to a character. - In parallel mode, the double height (bit 2 of the shape attribute) is active only on its own character. Setting one double height attribute does
not cover the following characters of the row (different from double height in serial mode). Figure 68. Rule for Serial and Parallel Color Combination
Highest priority
PARALLEL COLOR SERIAL COLOR DEFAULT COLOR
defined in TDSRAM defined in TDSRAM defined in page register
Lowest priority
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ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont'd) 7.4.4.11 Cursor Control s Horizontal position (by character) s Vertical position (by row) s Color or Underline Cursor Modes s Color Cursor with inverted foreground / inverted background s Flash or Steady mode Color Cursor Cursor display is controlled using two registers: - Cursor Horizontal Position R246 (F6h) Page 32 - Cursor Vertical Position R247 (F7h) Page 32. Notes: 1. Cursor operation in "Underline" mode: any screen location where the foreground color is identical to the background color behaves as a "lost cursor" (i.e. cursor not visible). Assuming a serial mode display, the screen location placed on the lower row after a double height character will lead to a "lost cursor". 2. Ghost fringing: assuming a cursor operation in color inversion mode, assuming a serial mode display, assuming the fringe is activated, the screen location placed on the lower row after a double height character may show a "ghost fringing" effect (the ghost color being an inverted background one). 3. Static or flash cursor Mode: the horizontal cursor value indicates the character position (i.e. first character pointed with a "1" value); in Underline Mode, the horizontal cursor value gives the position minus "1". 7.4.5 Vertical Scrolling Control s Top-Down or Bottom-Up shift s Freeze Display function s Shift speed control s Double Height Display scrolling Scrolling is performed in a programmable rolling window if the characters are in normal height.
In Line mode, the scrolling window must be entirely filled by programmed rows (each scrolled location is defined by one of the 11 available rows). Notes: 1. 80-characters combined with scrolling can only be used in Line mode 2. In Parallel (Level 1+) mode, scrolling is possible without serial attributes DS and DH. Use these two registers to control scrolling: - Scrolling Control Low R248 (F8h) Page 32 - Scrolling Control High R249 (F9h) Page 32 7.4.5.1 RGB & FB DAC and TSLU Outputs The R, G, B and FB pins of the ST92195/ ST92R195 are analog outputs controlled by true Digital to Analog Converters. These outputs are specially designed to directly drive the Video Processor. The R, G and B outputs are referred to Ground and they can drive up to 1.0V; they are loaded onchip by a 0.5K ohms typical load. The effective DAC output level is controlled by a 3 bit digital code issued by the display control logic with respect to the real time value of R, G or B and the Half-Intensity control bit, as follows:
R/G/B DAC code 0 0 0 0 1 1 1 1 1 Display aspect during FB No Color Half-Intensity Color Full-Intensity Color
The FB (fast switch) output is also referred to Ground and can drive up to 3.0V with an on-chip 0.5K ohm load. This analog FB output provides the best phase matching with the R, G, B signals. An example of the Fast Blanking Signal is shown in Figure 6. The TLSU pin is a digital output (0-5V).
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ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont'd) 7.4.6 Display Memory Mapping Examples The display content is stored in TDSRAM, (2 to 8K bytes starting at address 8000h). Use register TDPR R252 (FCh) Page 32 to address the memory blocks containing the display data. Two 4-bit address pointers (bits PG and HS) must be given that point to separate blocks containing the display page and the header/status rows. Alternatively, the PG and HS pointers can be written to the TDPPR R246 Page 33 and TDHSPR R247 Page 33 registers.
7.4.6.1 Building a Serial Mode Full Page 40Char Display Page Location: The 1 Kbyte block of page content is stored in the TDSRAM location pointed to by the PG3..PG0 bits. Header & Status Rows Location: The 0.5 Kbyte block containing the Header, Status Row 0 and Status Row 1 is pointed to by the HS3..HS0 bits. Row Scrolling Buffer Location: The scrolling buffer corresponds to the 40 bytes following the Row 23 when the scrolling feature is used.
Figure 69. Serial Mode (40 Characters) - Page Mapping
1K TDSRAM Row 1 Block Number(1K) 0 1 2 3 4 5 6 7 TDSRAM Address (hex) 8000 8400 8800 8C00 9000 9400 9800 9C00 TDPR Value (hex) PG3..PG0 0 2 4 6 8 A C E
2K 6K 8K
Row 23 Scrolling Buffer Free Space Resolution 1K bytes
Figure 70. Serial Mode (40 Characters) - Header and Status Mapping
Block Number (0.5K) 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 TDSRAM Address (hex.) 8000 8200 8400 8600 8800 8A00 8C00 8E00 9000 9200 9400 9600 9800 9A00 9C00 9E00 TDPR Value (Hex.) HS3..HS0 0 1 2 3 4 5 6 7 8 9 A B C D E F
0.5K TDSRAM Header Status Row 0 Status Row 1 Free Space
2K
6K 8K
Resolution 0.5K bytes
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ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont'd) 7.4.6.2 Building a Parallel Mode, 40-Char, Full Page Display Page Location: The pair of adjacent 1 Kbyte blocks of page content is stored in the TDSRAM location pointed to by the PG3..PG0 bits. The first block contains the characters, the second block contains the attribute bytes.
Header & Status Rows Location: The 0.5 Kbyte block containing the Header, Status Row 0 and Status Row 1 is pointed to by the HS3..HS0 bits. The Header/Status attributes are stored in this block at offset 80h. Row Scrolling Buffer Location: The scrolling buffer corresponds to the 40 bytes following Row 23 when the scrolling feature is used.
Figure 71. Parallel Mode (40 Characters) - Page Mapping
1K TDSRAM Row 1 Char. 1K TDSRAM Row 1 Attr. TDPR TDSRAM TDSRAM Block Number Address (hex) Address (hex) Value (hex) PG3..PG0 Attr. Char. (2K) 0 8000 8400 0 1 8800 8C00 4 2 9000 9400 8 3 9800 9C00 C
2K 6K 8K
Row 23 Char. Scrolling Buffer Free Space
Row 23 Attr. Scrolling Buffer Free Space
Resolution 2K bytes
Figure 72. Parallel Mode (40 Characters) - Header and Status Mapping
TDPR Value (hex) HS3..HS0 0 1 2 3 4 5 6 7 8 9 A B C D E F
0.5K TDSRAM Header Char. Status Row 0 Char. Status Row 1 Char. Free Space Header Attr. Status Row 0 Attr. Status Row 1 Attr. Free Space Resolution 0.5K bytes 80h
Block Number (0.5K) 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
TDSRAM Address (hex) 8000 8200 8400 8600 8800 8A00 8C00 8E00 9000 9200 9400 9600 9800 9A00 9C00 9E00
2K
6K 8K
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ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont'd) 7.4.6.3 Building a Serial Mode, 40-Char, Line Mode Display Half-Page Location: The 0.5 Kbyte block of half-page content is stored in the TDSRAM location pointed to by the PG3..PG0 bits.
Header & Status Rows Location: The 0.5 Kbyte block containing the Header, Status Row 0 and Status Row 1 is pointed to by the HS3..HS0 bits. The Row attribute (row count) is stored in this block at offset 100h and contains 12 bytes for line mode (see DCM1R register description). Row Scrolling Buffer Location: The scrolling buffer corresponds to Row 12 when the scrolling feature is used (in this case 11 rows are scrolled).
Figure 73. Serial (40 Characters) Line Mode Mapping
0.5K TDSRAM Block Number (0.5K) 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 TDSRAM Address (hex.) 8000 8200 8400 8600 8800 8A00 8C00 8E00 9000 9200 9400 9600 9800 9A00 9C00 9E00 TDPR Value (Hex.) PG3..PG0 0 1 2 3 4 5 6 7 8 9 A B C D E F Header Char. Status Row 0 Status Row 1 2K Free Space 100h Row Attr. 6K Free Space 8K Resolution 0.5K bytes
0.5K TDSRAM Row 1
Row 11 Row 12/ Scrolling Buffer Free Space Resolution 0.5K bytes
See Figure 22 for Address Values
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ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont'd) 7.4.6.4 Building a Parallel Mode, 40 Char, Line mode Display Half-Page Location: The pair of adjacent 0.5 Kbyte blocks of half page content is stored in the TDSRAM location pointed to by the PG3..PG0 bits. One block contains the characters, the other block contains the attribute bytes.
Header & Status Rows Location: The 0.5 Kbyte block containing the Header, Status Row 0 and Status Row 1 is pointed to by the HS3..HS0 bits. The Header/Status attributes are stored in this block at offset 80h. The Row attribute (row count) is stored in this block at offset 100h and contains 12 bytes for line mode (see DCM1R register description). Row Scrolling Buffer Location: The scrolling buffer corresponds to the Row 12 when the scrolling feature is used (in this case 11 rows are scrolled).
Figure 74. Parallel (40 Characters) Line Mode Mapping
0.5K TDSRAM Row 1 Char. 0.5K TDSRAM Row 1 Attr.
0.5K TDSRAM Header Char. Status Row 0 Status Row 1 Free Space Header Attr. Status Row 0 Status Row 1 80h
Row 11 Char. Row 12/Scrolling Buffer Free Space
Row 11 Attr. Row 12/Scrolling Buffer Free Space
Free Space Row Attr. Free Space Resolution 0.5K bytes
100h
Resolution 1K bytes
See Figure 21 for Address Values
See Figure 22 for Address Values
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ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont'd) 7.4.6.5 Building a Serial Mode, 80 Char, Full Page Display Half-Page Location: The pair of adjacent 1 Kbyte blocks of page content is stored in the TDSRAM location pointed to by the PG3..PG0 bits. The first block contains the left side of the page, the second block contains the right side of the page.
Header & Status Rows Location: The 0.5 Kbyte block containing the Header, Status Row 0 and Status Row 1 is pointed to by the HS3..HS0 bits. Row Scrolling Buffer Location: The scrolling buffer corresponds to the 40 bytes following the Row 23 when the scrolling feature is used.
Figure 75. Serial Mode (80 Characters) - Page Mapping
1K TDSRAM Row 1 Left 1K TDSRAM Row 1 Right
0.5K TDSRAM Header Status Row 0 Status Row 1
Row 23 Scrolling Buffer Free Space
Row 23 Scrolling Buffer Free Space Resolution 2K bytes
Free Space
Resolution 0.5K bytes
See Figure 23 for Address Values
See Figure 22 for Address Values
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ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont'd) 7.4.6.6 Building a Serial Mode, 80 Char, Line Mode Display Half-Page Location: The pair of 0.5 Kbyte blocks of half page content is stored in the TDSRAM location pointed to by the PG3..PG0 bits. The first block contains the left half rows, the other block contains the right half rows.
Header/Status Rows Location: The 0.5 Kbyte block containing the Header, Status Row 0 and Status Row 1 is pointed to by the HS3..HS0 bits. The Row attribute (row count) is stored in this block at offset 100h and contains 12 bytes for line mode (see DCM1R register description). Row Scrolling Buffer Location: The scrolling buffer corresponds to Row 12 when the scrolling feature is used (in this case 11 rows are scrolled).
Figure 76. Serial (80 Characters) Line Mode Mapping
0.5K TDSRAM Row 1 Left
0.5K TDSRAM TDSRAM TDSRAM TDPR Block Address Left Address Right Value (hex) Number(1K) (hex) (hex) PG3..PG0 0 8000 8200 0 1 8400 8600 2 2 8800 8A00 4 3 8C00 8E00 6 4 9000 9200 8 Row 11 5 9400 9600 A Row 12/Scroll Buffer 6 9800 9A00 C Free Space 7 9C00 9E00 E Row 1 Right
2K 6K 8K
Row 11 Row 12/Scroll Buffer Free Space
Resolution 1K bytes
Figure 77. Serial (80 Characters) Line Mode - Header and Status Mapping
0.5K TDSRAM Header Status Row 0 Status Row 1 Free Space 100h Row Attr. Free Space Resolution 0.5K bytes
See Figure 22 for Address Values
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ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont'd) 7.4.7 Font Mapping G0 is the basic character font. G1 is the mosaic font. It is not stored in ROM but is implemented in hardware. In serial mode it is addressed by a serial attribute (See Figure 3). In parallel mode it is accessed by bit 0 (CSS) of the parallel shape attribute and bit 1 (US) for separated mosaic (See Figure 4). G2 is a font of X/26 based + Menu shared characters. An Extended Menu character font available in parallel mode. It is accessed via bit 0 (CSS) in the parallel shape attribute (Character Set Selection). The Extended Menu font is not accessible in serial mode. 7.4.8 Font Mapping Modes There are two font mapping modes selected by the NCM bit in the NCSR register R245 (F5h) Page 32: Single G0 mode A set combining 83 characters from the G0 basic set plus 13 characters selected from 15 National character subsets. The National character subsets are selected by four bits (NC3:0) in the NCSR register R245 (F5h) Page 32. Triple G0 mode Three 96-character character sets (G0-0, G0-1 and G0-2) for multi alphabet applications. Character set selection is done by four bits (NC1:0 or NC3:2) in the NCSR register R245 (F5h) Page 32.
- In Serial Mode (Level 1), only 256 Character Codes are available using an 8-bit code. The character codes plus some serial attributes and some additional programmable options address 566 chars: 256 + 182 NS chars + 128 mosaics in single G0 mode. - In Parallel Mode (Enhanced Level 1), 512 Character Codes are available using a 9-bit code. The character codes plus some serial and parallel attributes, and some additional programmable options address 662 chars: 256 + 182 NS chars + 128 mosaic + 96 extended chars. in single G0 mode. Display ROM Font Entry: The user must define his own fonts for: - 278 characters: - 15 x 13 G0 National Character subsets + 83 G0 Character set or - 288 characters: 3 x 96-character character sets - 128 G2 based X/26 and Menu characters - 96 Extended Menu characters Table 21. Triple G0 Mode - Font Mapping
ROM Address 000h to 01Fh 020h to 07Fh 080h to 0FFh 100h to 15Fh 160h to 1BFh 1C0h to 1FFh Character CSS Font Usage Code 0E0h to 0FFh 1 Extended menu 020h to 07Fh G0 set 0 0 080h to 0FFh G2 + Menu (or serial 020h to 07Fh mode) G0 set 1 020h to 07Fh G0 set 2 0A0h to 0DFh 1 Extended menu
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ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont'd) Table 22. National Character Subset Mapping (Ordered by their G0 address)
1st 23h 8th 5Fh 2nd 24h 9th 60h 3rd 40h 10th 7Bh 4th 5Bh 11th 7Ch 5th 5Ch 12th 7Dh 6th 5Dh 13th 7Eh 7th 5Eh
Figure 78. Font Mapping Addresses SERIAL MODE Char. Codes 0 1F
SERIAL ATTRIBUTES G0 + OPTIONAL NATIONAL SET (96 CODES) G1* (32)
7F 80
G2 BASED + MENU (128 CODES)
FF
(32 CODES) G1* (32)
0
1F
3F
5F
7F 80
FF
*If Serial Attributes 19, 1A are used
Addresses
0
1F
SERIAL G0 + OPTIONAL NATIONAL SET (96 CODES)
7F 80
G2 BASED + MENU (128 CODES)
FF
PARALLEL MODE ATTRIBUTES (PS=x, CSS=0) (32 CODES) Char. Codes 0 1F
7F 80
FF
Addresses
100
11F
G0 (32)
17F 180
G1 (32)
19F
EXTENDED MENU CHARACTERS (96 CODES)
1FF
PARALLEL MODE (PS=1, CSS=1)
SERIAL ATTRIBUTES G1 (32) (32 CODES) RESERVED (32)
Char. Codes 0
1F
3F
5F
7F 80
9F
FF
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ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont'd) Table 23. Single G0 Mode - Font Mapping
ROM Address 000h to 01Fh 020h to 07Fh 080h to 0FFh 100h to 10Ch 10Dh to 119h 11Ah to 126h 127h to 133h 134h to 140h 141h to 14Dh 14Eh to 15Ah 15Bh to 167h 168h to 174h 175h to 181h 182h to 18Eh 18Fh to 19Bh 19Ch to 1A8h 1A9h to 1B5h 1C0h to 1FFh Character Code 0E0h to 0FFh 020h to 07Fh 080h to 0FFh (see table below) (see table below) (see table below) (see table below) (see table below) (see table below) (see table below) (see table below) (see table below) (see table below) (see table below) (see table below) (see table below) (see table below) 0A0h to 0DFh CSS 1 Font Usage Extended menu G0 + National Character Subset 0 (96 chars) G2 + Menu (128 chars) National Character Subset 1 (13 chars) National Character Subset 2 (13 chars) National Character Subset 3 (13 chars) National Character Subset 4 (13 chars) National Character Subset 5 (13 chars) National Character Subset 6 (13 chars) National Character Subset 7 (13 chars) National Character Subset 8 (13 chars) National Character Subset 9 (13 chars) National Character Subset 10 (13 chars) National Character Subset 11 (13 chars) National Character Subset 12 (13 chars) National Character Subset 13 (13 chars)(Free for user) National Character Subset 14 (13 chars) (Menu chars.) Extended menu NC(3:0) 0000b 0001b 0010b 0011b 0100b 0101b 0110b 0111b 1000b 1001b 1010b 1011b 1100b 1101b 1110b
0
1
Table 24. National Character Subsets
Subset Name Subset No. (Decimal) Character Code (Hex)
23 24 40 5B 5C 5D 5E 5F 60 7B 7C 7D 7E
Czech/Slovak English Estonian French German Italian Lettish/ Lithuanian Polish Portugese/ Spanish Rumanian Serbian/ Croatian/ Slovenian Swedish/ Finnish Turkish 3 0 9 1 4 6 10 8 5 7 12 2 11
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ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont'd) Figure 79. Pan-European Font (East/West) Character Codes (Hex.)
National Character Subset 0 Extended Menu
G0_0
G2-Menu
National Char. Subsets 1..14d
Extended Menu
Figure 80. OSD Picture in Parallel Mode
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ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY(Cont'd) 7.4.9 Register Description HORIZONTAL BLANK REGISTER (HBLANKR) R240 - Read/Write Register Page: 32 Reset Value: 0000 0011 (03h)
7 HB7 HB6 HB5 HB4 HB3 HB2 HB1 0 HB0
VERTICAL POSITION REGISTER (VPOSR) R242 - Read/Write Register Page: 32 Reset Value: 0000 0000 (00h)
7 0 0 VP5 VP4 VP3 VP2 VP1 0 VP0
Bit 7:6 = Reserved, keep in reset state. Bit 5:0 = VP[5:0]: The vertical start position is calculated with a line downcounter decremented on each Hsync by VP[5:0]. The Display of the first row begins when the counter turns to zero. Vert delay = (VP5*32 + VP4*16 + VP3*8 + VP2*4 + VP1*2 + VP0) * Tline (Tline= 64 s)
It controls the length of the Horizontal Blank which follows the horizontal sync pulse. Bit 7:0 = HB[7:0]: The horizontal blank period is calculated with a pixel down counter loaded on each Hsync by HB[7:0]. During this period, FB = 0 and (R, G, B) = black. Thblank = [(HB7*128 + HB6*64 + HB5*32 + HB4*16 + HB3*8 + HB2*4 + HB1*2 + HB0) * Tpix] HORIZONTAL POSITION REGISTER (HPOSR) R241 - Read/Write Register Page: 32 Reset Value: 0000 0011 (03h)
7 HP7 HP6 HP5 HP4 HP3 HP2 HP1 0 HP0
Bit 7:0 = HP[7:0]: The horizontal start position is calculated with a pixel down-counter loaded on each Hsync by HP[7:0]. The first character display starts when the counter turns to zero. Hori delay= [(HP7*128 + HP6*64 + HP5*32 + HP4*16 + HP3*8 + HP2*4 + HP1*2 + HP0) * Tpix] + Thblank
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ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont'd) FULL SCREEN COLOR CONTROL REGISTER (FSCCR) R243 - Read/Write Register Page: 32 Reset Value: 0000 0000 (00h)
7 BE TIO MM HTC FSC3 FSC2 FSC1 0 FSC0
Bit 4 = HTC: Half-Tone/Translucency Control Bit This bit allows the selection of TSLU or HT as alternate function output. 0: TSLU is selected as I/O pin alternate function 1: HT is selected as I/O pin alternate function Bit 3:0 = FSC[3:0]: Full Screen Color control bits: FSC[3:0]= (Half-intensity, R, G, B) Table of Color Values (hex)
0 Black 1 Blue 2 Green 3 Cyan 4 Red 5 Magenta 6 Yellow 7 White 8 Black 9 Dark blue A Dark green B Dark cyan C Dark red D Dark magenta E Dark yellow F Grey
Bit 7 = BE: Box Enable, see Table 11. Bit 6 = TIO: Text out/not in, see Table 11. Bit 5 = MM: Mixed Mode, see Table 11. Note: When Flash and Box attributes are decoded at the same time on the characters of a header (when BE=1, MM=1, TIO=1) the full screen over the characters is displayed as transparant.
Table 25. Box Mode/Translucency Configurations
BE 0 0 1 1 1 1 TIO x x 0 0 1 1 MM 0 1 0 1 0 1 If Translucency is used Translucent Background for all the display Transparent Background for all the display Text inside box translucent, Text outside box Text inside box solid, Text outside box blanked blanked Text inside box with solid background Text out- Text inside box with translucent background Text side box with transparent background outside box with transparent background Text inside box not displayed, transparent backText inside box not displayed, transparent background. Text outside box with translucent background. Text outside box with solid background ground Text inside box with transparent background. Text inside box with transparent background. Text Text outside box with solid background outside box with translucent background If Translucency is not used Solid Background for all the display Transparent Background for all the display
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ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont'd) HEADER & STATUS CONTROL REGISTER (HSCR) R244 - Read/Write Register Page: 32 Reset Value: 0010 1010 (2Ah)
7 0 0 ES1 NS1 ES0 NS0 EH 0 NH
Bit 4,2 = NS[1:0]: Serial/Parallel Mode Status Rows display control bits. If the corresponding bit is reset, the Status Row uses only serial attributes. If the corresponding bit is set, the Status Row uses parallel attributes (except size attributes). Bit 1 = EH: Enable Header display control bit. If set, the Header row is displayed; if reset, the Header row is filled with the full screen color. Bit 0 = NH: Serial/Parallel Mode Header display control bit. If the bit is reset, the Header uses only serial attributes. If the bit is set, the Header uses of parallel attributes.
Bit 7:6 = Reserved. Bit 5,3 = ES[1:0]: Enable Status Rows [1:0] display control bits. If the bit is reset, the corresponding Status Row is filled with the full screen color; if the bit is set, the corresponding Status Row is displayed (Status Row 1 is assumed to be the bottom one).
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ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont'd) NATIONAL CHARACTER SET REGISTER (NCSR) R245 - Read/Write Register Page: 32 Reset Value: 0000 0000 (00h)
7 TSLE 0 SWE NCM NC3 NC2 NC1 0 NC0
The register bit values are sampled and then activated only at each field start (on Vsync pulse). Bit 7 = TSLE: Translucency/Half-Tone Output Enable bit. 0: Translucency/Half-Tone signal disabled 1: Translucency/Half-Tone is enabled. Translucency or Half-Tone realtime control signal is routed in the TSLU/HT pin (depending on the HTC bit in the FSCCR register). Note: Translucent display depends also on the BE, TIO and MM bits, see Table 11. Bit 6 = Reserved. Bit 5 = SWE: G0 Switch Enable Control Bit. In case of a multiple G0 alphabet configuration (NCM=1), this bit allows to switch from a first to a second predefined G0 alphabet, using a single serial attribute (1Bh). In case of a single G0 alphabet configuration (NCM=0), the SWE bit will have no effect. If SWE is reset, the used G0 alphabet is pointed through NC[1:0]. If SWE is set, the used G0 alphabet is pointed through NC[3:2] and NC[1:0] toggled by 1Bh serial attribute. Bit 4 = NCM: National Character Mode control bit. This bit reconfigures a part of the font set as defining:
- either a single G0 alphabet with up to 15 national sub-sets, - or 3 different G0 alphabets. If NCM is reset, a single G0 alphabet configuration is activated and the 15 national sub-sets are selected through the NC[3:0] bits. If NCM is set, a triple G0 alphabet configuration is activated, the selection of the G0 set used for the display is done through either NC[3:2] or NC[1:0] bits, depending upon the SWE control bit and the serial attribute 1Bh values. Bit 3:0 = NC[3:0]: National Character Set Selection. If the NCM bit is reset, these bits define which national sub-set has to be used to complete the basic currently used G0 alphabet set. If the NCM is set, these bits define which G0 is used. Figure 81. National Characters Selection
0 NCM 1
NC[3:0]
0
SWE
1
NS0 NS1
NC[1:0]
SERIAL ATTR. 1Bh TOGGLE
G0-0 G0-1 G0-2 NS14
NC[1:0]
NC[3:2]
15 NATIONAL 3 G0 SETS CHAR. SETS
G0-0 G0-1 G0-2
G0-0 G0-1 G0-2
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ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont'd) CURSOR HORIZONTAL POSITION REGISTER (CHPOSR) R246 - Read/Write Register Page: 32 Reset Value: 0000 0000 (00h)
7 0 0 CHP6 CHP5 CHP4 CHP3 CHP2 CHP1 CHP0
TV fields followed by a "1" state during the 16 next TV fields. This flag provides a 1Hz time reference for an easy software control of all flashing effects (assuming a 50 Hz TV signal, the FON total period will be 0.96 seconds). This bit is READ ONLY. Trying to write any value will have no effect. Bit 6:5 = CM[1:0]: Cursor Mode control bits.
CM1 CM0 Cursor Mode 0 0 Cursor Disable Static Cursor (inverted foreground & invert0 1 ed background colours) Flash Cursor (flash from current to inverted 1 0 colours & vice versa) Cursor done with Underline (use of current 1 1 foreground color)
Bit 7 = Reserved. Bit 6:0 = CHP[6:0]: Cursor Horizontal Position. The cursor is positioned by character. CHP= 0 points to the first character CHP= 39d points to the end of the row (single page display) CHP= 79d points to the last character in the row (double page display) CURSOR VERTICAL POSITION REGISTER (CVPOSR) R247 - Read/Write Register Page: 32 Reset Value: 0000 0000 (00h)
7 FON CM1 CM0 CVP4 CVP3 CVP2 CVP1 0 CVP0
Bit 4:0 = CVP[4:0]: Cursor Vertical Position. The cursor is positioned by row. The cursor is always single size. CVP= 0 locates the cursor on the Header row CVP= 25d locates the cursor on the last Status row.
Bit 7 = FON: "Flash On" flag bit. The FON bit remains at "0" during 32 consecutive
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ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont'd) SCROLLING CONTROL LOW (SCLR) R248 - Read/Write Register Page: 32 Reset Value: 0000 0000 (00h)
7 SCE FSC SS FRS4 FRS3 FRS2 FRS1
REGISTER
Bit 6 = FSC: Freeze scrolling Note: The 2 control bits SCE and FSC must be set to "1" before enabling the Global double height (see the DH bit in the SCHR register). Bit 5 = SS: Scrolling Speed Control bit. 0: The display is shifted by 2 TV lines at each TV frame (i.e. after 2 Vertical sync pulses). 1: The display is shifted by 4 TV lines at each TV frame. Bit 4:0 = FRS[4:0]: These bits define the uppermost Row value to be scrolled (rows are numbered from 1 to 23). In case of global double height mode programming, FRS[4:0] must mandatorily be equal to 00000.
0 FRS0
Bit 7 = SCE: Scrolling Enable Before enabling scrolling, the scrolling area must be defined by the FRS[4:0] and LRS[4:0] bits. The scrolling direction is defined by the UP/D bit. 0: Disable scrolling 1: Enable scrolling Table 26. Scrolling Control Bits
DH 0 0 1 SCE 0 1 0 FSC x x x UP/D x 1 0 1 0
FRS[4:0] LRS[4:0] Meaning x x No Global Double Height, No Scrolling x x No Global Double Height, Scroll up x x No Global Double Height, Scroll down 0 x Global Double Height, No Scrolling, Display top half 0 x Global Double Height, No Scrolling, Display bottom half
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ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont'd) SCROLLING CONTROL HIGH (SCHR) R249 - Read/Write Register Page: 32 Reset Value: 0000 0000b (00h)
7 DH EER UP/D LRS4 LRS3 LRS2 LRS1
REGISTER
0 LRS0
Bit 6 = EER: End of Extra Row flag bit. This bit is forced to "1" by hardware when the last line of the extra row is displayed in case of scrolling in normal height. This bit is Read only. In Global double height, the EER bit is set to "1" each time the last line of a new displayed row appears. Bit 5 = UP/D: Scrolling Up/Down This bit has two functions: to control the scrolling direction and to select the half part of the page in Global Double Height display. Scrolling direction: 0: Top-Down shift 1: Bottom-up shift Half-page selection: When DH is set, if UP/D is set, the upper half of the page is displayed (i.e. Header and the page rows 1 to 11). When DH is set, if UP/D is reset, the lower half of the page is displayed (i.e. rows 12 to 23 and the Status rows). The UP/D control bit must be defined before setting the Global height (DH bit); changing UP/D after DH is set, will not change the already selected half page. Bit 4:0 = LRS[4:0]: Last row to be scrolled (1 to 23). In case of scrolling in global double height, the Last row must be equal to 0x 10111 to display the status row in the two half pages.
Bit 7 = DH: Global Double Height control bit. This bit must only be used in Page Mode. When DH is set, the display is turned in double height including the header, excluding the vertical offset before the display area. The status rows are not affected by the DH bit and they remain in normal height. Depending on the value of the UP/D control bit, when DH is set, the first or second half of the page is displayed in double height. This bit assumes a zooming function. Notes: - In global double height, when the top half page is displayed, if row 11 has a double height attribute, the first status row is corrupted. To avoid this effect, save row 11, remove the serial double height attribute from this row and display the upper part of the page. Then, before displaying the lower part of the page, restore the serial DH attribute in row 11. - When the bottom half page is displayed, if row 23 has a double height attribute, the first status row is not displayed. To avoid this effect remove the serial double height attribute from row 23.
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ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont'd) Figure 82. Memory Management for Scrolling Window
Normal Height T0 3 rows to be scrolled Freeze off after 5 Vsync Freeze on after 5 Vsync New TDSRAM address after EER=1
ROW A ROW B ROW C
ROW A ROW B ROW C
ROW A ROW B ROW C TDSRAM CONTENT DISPLAY AREA Row 24 ROW A ROW B ROW C ROW D
EER=0
ROW A
ROW A
ROW A
T + 5 VSYNC
ROW B ROW C
ROW D
ROW B ROW C
ROW D
ROW B ROW C
ROW D
EER=0
NEW TDSRAM CONTENT
ROW B ROW C ROW D
ROW B
ROW A
T + 10 VSYNC
ROW C ROW D
ROW B ROW C
ROW D
ROW B ROW C ROW D
Row 24
ROW E
EER=1
ROW A
ROW A
ROW B
ROW B
ROW B ROW C
ROW D
ROW C ROW D
ROW E
T + 15 VSYNC
ROW C
ROW D
EER=0 A = First row to scroll C= Last row to scroll E= Extra row
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ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont'd) DISPLAY CONTROL MODE (DCM0R) R250 - Read/Write Register Page: 32 Reset Value: 0000 0000 (00h)
7 DE STE FRE CE GFR GRE SF
0
REGISTER
1: Conceal any text defined as concealed by serial attributes Bit 3 = GFR: Global Fringe Enable control bit. If this bit is set, the whole display is in fringe mode (except if a Double page display mode is programmed). Bit 2 = GRE: Global Rounding Enable control bit. If this bit is set, the whole display is in rounding mode (except if a Double page display mode is programmed). Bit 1 = SF: Screen Format control bit. 0: Configures the Display for 4/3 TV screen format. 1: A fixed offset of 128 Pixel clock periods is added before any character is displayed; the Full Screen Color attribute is used while the offset is running. The SF bit intended for displaying on 16/9 TV screen format tubes, the display picture will be recentered. Bit 0 = S/D: Single or Double page control bit. 0: A single page is displayed on screen (i.e. 40character width). 1: A set of two pages is displayed contiguously (i.e. 80-character width). Note: In 80 characters per row and in full page mode, line 25 of each field is displayed as a transparant line (as this line is not in the visible part of the screen, this should not present a limitation). Programming a Double page display will automatically mask the Fringe, Rounding and Parallel Mode control bits. Their register values are not changed and they will automatically recover their initial effect if the display is switched back in a Single page mode.
0 S/D
Bit 7 = DE: Display Enable control bit. If DE is reset, no display will be performed. If DE is set, a display will be done as defined through the various control bits. Bit 6 = STE: Semi-Transparent Enable bit. This bit is active only in Single page display mode. While the Display is disabled, the horizontal and vertical sequencers are forced in their reset state and the RGB & FB DACs are not off (still presenting on-chip resistors to Ground). Note: This mode shows a visible grid on the screen. Bit 5 = FRE: Fringe Enable control bit. If this bit is set, and the SWE bit is reset (refer to the National Character Set Register description) the serial attribute 1Bh has a fringe toggle function.
FRE 0 0 1 1 SWE 0 1 0 1 1Bh Serial attribute acts as: No Action G0 Toggle Fringe Toggle G0 Toggle
Bit 4 = CE: Conceal Enable control bit. 0: Reveal any text defined as concealed by serial attributes (Default)
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ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont'd) DISPLAY CONTROL MODE (DCM1R) R251 - Read/Write Register Page: 32 Reset Value: 0000 0000 (00h)
7 0 0 0 0 EXTF FBL PM
1
REGISTER
mode, i.e. a character or attribute is coded with a single byte. If the SPM bit is set, the display is done in Parallel mode, i.e. a character or an attribute is coded on two bytes. TDSRAM POINTER REGISTER (TDPR) R252 - Read/Write Register Page: 32 Reset Value: 0000 0000 (00h)
7 HS3 HS2 HS1 HS0 PG3 PG2 PG1 0 PG0
0 SPM
Bit 7:4 = Reserved bits, keep in reset state. Bit 3 = EXTF: External Font. Only when the emulator is used, this bit selects the font memory containing a user-defined OSD font. In normal user application, this bit has no effect. 0: Internal font memory of the emulator chip. 1: External font RAM of the emulator board. Bit 2 = FBL: Fast Blanking Active Level control bit. The FBL bit must be reset if the on-screen display is done while the FB output is low. The FBL bit must be set if the on-screen display is done while the FB output is high. This bit also controls the TSLU AF output polarity with the same rule as for FB. Bit 1 = PM: Line Mode control bit. If PM is reset, the display is working in Full page mode, i.e. the screen is composed of one header, 23 text rows plus 2 status rows. If PM is set, the display works in Line mode. Line mode allows up to 12 rows to be displayed anywhere on the screen. The row attribute (see TDSRAM mapping) contains the row numbers on the screen. The byte position of the row attribute conrresponds to the row in the TDSRAM. For example, if the 3rd byte of the row attribute contains 6, the 3rd row in TDSRAM will be displayed as the 6th row on the screen. Bit 0 = SPM: Serial/Parallel Mode control bit. If the SPM bit is reset, the display is done in Serial
Bit 7:4 = HS[3:0]: Location of the current Header and Status Rows in the TDSRAM. Bit 3:0 = PG[3:0]: Location of the current Page content (rows 1 to 23) in the TDSRAM. For more details, refer to Section . The HS[3:0] and PG[3:0] bits described by the R246 and R247 registers in page 32. Display locations, Head/Stat location, Page location, are physically the same: these sets of address bits can be modified through two different programming accesses.
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ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont'd) DISPLAY ENABLE 0 CONTROL REGISTER (DE0R) R253 -Read/Write Register Page: 32 Reset Value: 1111 1111 (FFh)
7 R8 R7 R6 R5 R4 R3 R2 0 R1
DISPLAY ENABLE 2 CONTROL REGISTER (DE2R) R255 -Read/Write Register Page: 32 Reset Value: x111 1111 (xFh)
7 x R23 R22 R21 R20 R19 R18 0 R17
Bit 7:0 = R[8:1]: Row display enable control bit. When the "Ri" bit is set (Reset value), the corresponding row (with row in the page, numbered from 1 to 23) will be displayed. When the "Ri" bit is reset, the full screen color is displayed. DISPLAY ENABLE 1 CONTROL REGISTER (DE1R) R254 -Read/Write Register Page: 32 Reset Value: 1111 1111 (FFh)
7 R16 R15 R14 R13 R12 R11 R10 0 R9
Bit 7 = Reserved . Bit 6:0 = R[23:17]: Row display enable control bit. When the "Ri" bit is set (Reset value), the corresponding row (with row in the page, numbered from 1 to 23) will be displayed. When the "Ri" bit is reset, the full screen color is displayed.
Bit 7:0 = R[16:9]: Row display enable control bit. When the "Ri" bit is set (Reset value), the corresponding row (with row in the page, numbered from 1 to 23) will be displayed. When the "Ri" bit is reset, the full screen color is displayed.
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ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont'd) DEFAULT COLOR REGISTER (DCR) R240 - Read/Write Register Page: 33 Reset Value: 0111 0000 (70h)
7 0
TDSRAM PAGE POINTER REGISTER (TDPPR) R246 - Read/Write Register Page: 33 Reset Value: xxx0 0000 (x0h)
7 x x x 0 PG3 PG2 PG1 0 PG0
DFG3 DFG2 DFG1 DFG0 DBG3 DBG2 DBG1 DBG0
Bit 7:4 = DFG[3:0]: Default Foreground Color. DFG[3:0] = (Half-Intensity, R, G, B) Bit 3:0 = DBG[3:0]: Default Background Color DBG[3:0] = (Half-Intensity, R, G, B) Table of Color Values (hex)
0 Black 1 Blue 2 Green 3 Cyan 4 Red 5 Magenta 6 Yellow 7 White 8 Black 9 Dark blue A Dark green B Dark cyan C Dark red D Dark magenta E Dark yellow F Grey
Bit 7:4 = Reserved, keep in reset state. Bit 3:0 = PG[3:0]: Page Pointer Location of the current Page content (rows 1 to 23) in the TDSRAM. For more details, refer to the Display Memory Mapping Section . TDSRAM HEADER/STATUS POINTER REGISTER (TDHSPR) R247 - Read/Write Register Page: 33 Reset Value: xxx0 0000 (x0h)
7 x x x 0 HS3 HS2 HS1 0 HS0
CURSOR ABSOLUTE VERTICAL POSITION REGISTER (CAPVR) R241 - Read/Write Register Page: 33 Reset Value: 0000 0000 (00h)
7 0 0 0 ACP4 ACP3 ACP2 ACP1 0 ACP0
Bit 7:4 = Reserved, keep in reset state. Bit 3:0 = HS[3:0]: Header/Status Rows Pointer Location of the current Header and Status Rows in the TDSRAM. For more details, refer to the Display Memory Mapping paragraph Section .
Bit 7:5 = Reserved, keep in reset state. Bit 4:0 = ACP[4:0]: Absolute Vertical Position of the cursor in case of double height or scrolling.
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ST92185B - ON SCREEN DISPLAY (OSD)
7.4.10 Application Software Examples Before starting an OSD Display, it is very important to start all the internal clock/timings To understand the software routines given below, make a thorough study of the chapters on the Reset and Clock Control Unit (RCCU) and the TDSRAM Interface. Initialization of the Internal Clock ;========================================================================= ; MAIN CLOCK INIT ;========================================================================= CLOCKS:: ;--------- CPU MAIN CLOCK -----------; C K M A I N provided by the freq. multplier spp #TCCR_PG; Timings & clock Controller registers page ; page 39 or 27 ld MCCR,#0x05; program the frequency multiplier down ; counter in the feed-back loop (253 =FD) ; freq=(5+1)*2 =12Mhz ; freq=(7+1)*2 =16Mhz ; freq=(8+1)*2 =18Mhz ld MCCR,#0x85; enable the freq. multiplier srp #BK20 ldw rr0,#0x2FFF; time_stab1: ; for frequency multiplier stabilization decw rr0; change CPU source clock & wait clock stabilization cpw rr0,#0x00; jxnz time_stab1; ld MCCR,#0xC5 ; select the freq. multiplier as main clock pop ppr ;========================================================================= ; SYNCHRO START ;========================================================================= spp #SYCR_PG ; set page pointer to page 23h or 35 decimal ld CSYCTR,#000h; R243, Hsync and Vsync from deflection part (external) ld CSYSUR,#0C4h; R242 Sync Controller Set-up register ; Standard mode, Positive polarity of Hsync & Vsync ; delay on Hsync/Vsync HSF(3:0)=9 ;========================================================================= ; DISPLAY PIXEL CLOCK ;========================================================================= ; spp #TCCR_PG; Timings & clock Controller registers page ; set page pointer to page 39 decimal ld SKCCR, #0x09; FE, Skew clock control register ; program the frequency multiplier down ; counter in the feed-back loop
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ST92185B - ON SCREEN DISPLAY (OSD)
; dot_freq= 4Mhz(4+1)=20Mhz (4/3) ; dot_freq= 4Mhz(5+1)=24Mhz (16/9) ; divide by 2 ld SKCCR, #0x89; enable the freq. multiplier srp #BK20 ldw rr0,#0x0FFF; time_stab2: ; for frequency multiplier stabilization decw rr0; SKEW clock stabilization cpw rr0,#0x00 ; jxnz time_stab2; ld PXCCR,#0x80;(PXCCR) start Pixel Line PLL spp #TDSR_PG2; page 26h, TDSRAM Controller registers third page srp #000h ld CONFIG, #003h; FC, ram Interface Configuration register ; enable display and Dram access ;======================================================================= Initialization of the OSD in Serial Mode ;======================================================================= ; INIT DISPLAY ROUTINE ;======================================================================= INIT:: ;-----------Display Position & Black Reference spp #DMP1_PG; page 020h Display memory map registers page ld HBLANKR,#0x45; HBLANKR register [7: 0]; reset=03 ; important delay for black reference on RGB cathod ld HPOSR,#0x35; HPOSR register [7:0]; reset=03 ld VPOSR,#0x10; VPOSR register [5:0]; reset=00 ;----------------spp #DMP1_PG; page 020h Display memory map registers page ; F3, Full Screen Color register ld FSCCR, #0x01 ; no subtitle mode ; BE, Box enable ; TIO, Text in/out ; MM, Mixed Mode ; FSC[3:0]=half blue full screen ld HSCR, #03Fh; bit5, 4, 3, 2, 1, 0 ; ES1 , NS1, ES0, NS0, EH, NH ; 0x3F > set header and status in level 1+ ; (parallel) ; 0x2a > set header and status in level 1 ; F5, National Characters register ld NC, #010h; SWE, NCM, NC[3:0] ;------- Scrolling INIT ---------spp #DMP1_PG; page 020h Display memory map registers page
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ST92185B - ON SCREEN DISPLAY (OSD)
; F8, Scrolling Control Line register ld SCLR ,#000h ; SCE, FSC, SS, FIRSTROWSCRO[4:0] ; F9, Scrolling Control Horizontal register ld SCHR ,#02fh ; DH, ER, UP/D, LASTROWSCRO[4:0] ;------- Cursor position ; F8, Scrolling Control Line register ld SCLR ,#000h ; SCE, FSC, SS, FIRSTROWSCRO[4:0] ; F9, Scrolling Control Horizontal register ld SCHR ,#02fh ; DH, ER, UP/D, LASTROWSCRO[4:0] ; F6, Cursor Horizontal Position register ld CHPOSR , #005h; CURSOR HPOS [6:0] ; F7, Cursor Vertical Position register ld CVPOSR , #000h; FON, CM[1:0], CURSOR VPOS[4:0] ;------- Control ; FA, Control Mode 0 register ld DCM0R,#0a0h; DE, STE, FRE, CE, GFR, GRE, SF=4/3, S/D=40 ; display enable ; solid mode ; toggle fringe enable ld DCM1R,#0x04; register 251 (FBh) Control Mode 1 register ; DAT[6:4]/bits 7,6,5 & TDR/bit4 ; FNEX=0, on-chip font ; FBL=1 fastblanking active high ; PM =0 Full page mode ; SPM =0 serial mode ;--------Dram location: header/status rows, current display ; FC, Dram Location register ld TDPR, #080h; HS[3:0], AD[3:0] ; for header bit12=1 ;------- foreground/background spp #DMP2_PG; page 021h Display memory map registers page ld DC, #07Fh ; reg. F0h, DFG [3:0], DBG [3:0] ; FG full white ; BG grey (half white) ;----------------------------spp #DMP1_PG; page 020h Display memory map registers page ld DE0R, #0FFh; ROWEN [8:1] ld DE1R, #0FFh; ROWEN [16:9] ld DE2R, #0FFh; ROWEN [23:17] ret =======================================================================
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ST92185B - SYNC CONTROLLER
7.5 SYNC CONTROLLER The SYNC Controller receives Horizontal / Vertical sync information coming from the chassis. The VSYNC and HSYNC inputs use schmitt triggers to guarantee sufficient noise rejection. The SYNC Controller unit provides the H internal sync signal to the Display Skew Corrector, which rephases the Pixel clock. It provides also the H and V internal sync signals to the TDSRAM Controller to perform correct TV line counting, thus generating the necessary time windows for a proper TDSRAM access real time Figure 83. Sync Controller Block Diagram
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sharing by the Display Controller and the CPU (for more details refer to the TDSRAM Controller chapter). Field information is also available for the Display Controller. The SYNC Controller unit also generates two interrupt sources corresponding respectively the TV field start and to the end of VBI event ("VBI" stands for Vertical Blank Interval). The SYNC Controller implements also a "Composite Sync" signal generator which provides a composite sync output signal (called CSO) available through an I/O port alternate function.
VSYNC
VPOL VSEP Vertical Sync Extr. HPOL VDLY Vcso Vertical Pulse Generator 1 0 Internal H generator (64 s) MOD0 0 1 MOD1 Hpls Vertical Controller
Vout (to DISPLAY, etc.) FLDST interrupt Pulse shaper
HSYNC CSYNC
VPOL Field (from Sync Ext.) MOD1 MOD0 4 MHz
Equalization Pulse & Line Sequencer
CSO_AF
Composite Sync. Generator
(MOD0+MOD1)*VSEP
HSF(3:0) Hpls Skew Corrector Hint pgmble delay
Vout FLDEV
Field detect.
HPOL VDLY MOD1 FLDEV EOFVBI VBIEN VPOL MOD0 FLDST FSTEN VSEP HSF(3:0)
Pulse shaper line counter HFLG
Vout EOFVBI interrupt Hout (to DISPLAY, etc.)
SCCS0 Register
SCCS1R Register VR02092A
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ST92185B - SYNC CONTROLLER
SYNC CONTROLLER (Cont'd) 7.5.1 H/V Polarity Control Two control bits manage the H/V polarities. HPOL (SCCS0R.6) manages the HSYNC polarity (a positive polarity assumes the leading edge is the rising one). VPOL (SCCS0R.7) controls the VSYNC polarity. 7.5.2 Field Detection Field detection is necessary information for the Display controller for fringe and rounding features. To determine correctly the field in case of using separate H and V input signals, it is necessary to provide an internal compensation of the hardware delay generated on VSYNC (VSYNC is generally issued by integrating the equalization pulses). Therefore the VSYNC leading edge is compared to the leading edge of an internally delayed HSYNC. The delay applied to HSYNC is software programmable through the SCCS0R (3:0) bits (from 0 to 63 s). It must be calculated by the user as being the time constant (modulo 64 s) used to extract VSYNC by the other components of the chassis. 7.5.3 Interrupt Generation The SYNC Controller unit can provide two different interrupts to the ST9+ Core. The first interrupt appears at each beginning of field upon detection of the Vertical Sync pulse coming from the deflection circuitry (i.e. from VSYNC); it is called the "Field start" interrupt. A flag is associated to this interrupt, called "FLDST" (SCCS1R.6). This flag is set to "1" by hardware when the Vertical Sync pulse appears. It must be cleared by software. The second interrupt appears at the end of each Vertical Blank Interval. It is generated at the begin-
ning of the line 25 counted from the deflection circuitry (i.e. from VSYNC); and is called the "End OF VBI" interrupt. A flag is associated to this interrupt, called "EOFVBI" (SCCS1R.7). This flag is set to "1" by hardware when the line 25 starts. It must be cleared by software. These two interrupts EOFVBI and FLDST are respectively attached to the INT4 and INT5 external interrupt inputs of the ST9+ Core. The leading edges of the 2 interrupt requests are the falling ones. (For more details, refer to the Interrupts chapter). 7.5.4 Sync Controller Working Modes Different working modes are available fully controlled by software. The first two working modes assume that TV deflection sync signals are available and stable. The last two modes assume that no TV signal is available. The chip works in a free-running mode providing standard TV Sync signals based on the main internal 4 MHz clock. Switching from one mode to any other is done under full software control, through the programming of two control bits called as MOD1 and MOD0. These control bits are described in the SCCS1R register 7.5.4.1 Standard Sync Input Mode This mode is accessed when both MOD1 and MOD0 bits are reset. In this mode, the P receives the chassis synchro through two separate inputs. These are VSYNC and HSYNC. It also assumes the VSEP (SCCS0R.5) is reset.
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ST92185B - SYNC CONTROLLER
SYNC CONTROLLER (Cont'd) 7.5.4.2 Composite Sync Input Mode This mode is very similar to the "Standard Sync Input Mode" described above. It is also accessed when both MOD1 and MOD0 bits are reset. In Composite Sync mode, a single CSYNC/ HSYNC input pin is used to enter both the horizontal and vertical sync pulses (VSEP control bit is set to 1). In this mode, the VSYNC pin must be tied to VSS on the application board to prevent a floating CMOS input configuration.
The CSYNC signal characteristics are assumed to perfectly respect the STV2160 TXTOUT pin specification which is reviewed in Figure 84 & Figure 85. The vertical sync signal is extracted from the CSYNC signal by the mean of an Up/Down counter used as a digital integrator. The counter works in "Up" mode during the sync pulses. Two time constants can be programmed using the VDLY control bit (refer to the register description). The smallest one corresponds to 16s; the second one being 32s.
Figure 84. STV2160 TXTOUT Timings
n
1st TV Field
623
624
625
1
2
3
4
5
6
TXTOUT
8s
8s
58s
38s 8s
2nd TV Field
311
312
313
314
315 6s 8s
316
317
318
319
TXTOUT
8s
8s
58s
VR02092B
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ST92185B - SYNC CONTROLLER
SYNC CONTROLLER (Cont'd) 7.5.4.3 Free-Running Monitor Sync Mode This mode is accessed when the MOD1 bit is set. In this mode, the chassis HSYNC and VSYNC signals are not used. They are replaced by the sync signals which are fully Crystal based (use of the internal main 4 MHz Clock). Two free-running monitor modes are available: when the MOD0 bit is reset the Composite Sync output (CSO) is generated for a 60Hz format; when the MOD0 bit is set to "1" the Composite Figure 85. Even/Odd Field Timings
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Sync output (CSO) is generated for a 50Hz format. For both formats, the TV line period is 64s. The Composite Sync alternate function Output (CSO) can be activated or disabled under control of the VSEP bit. In Free-Running Monitor Sync mode, the VPOL control bit is used to control whether an interlaced or non-interlaced TV context must be generated. When the non-interlaced context is programmed, only the "1st TV Field" configuration is generated.
d1
1st TV Field d2 d1
622 522
623 523
624 524
625 525
1 1
2 2
3 3
4 4
5 5 d1 = 4.75 s
6 6
(50 Hz Mode) (60 Hz Mode)
d2 = 2.25 s
2nd TV Field d1
d2 319 (50 Hz Mode) 269 (60 Hz Mode)
VR02092C
310 260
311 261
312 262
313 263
314 264
315 265
316 266
317 267
318 268
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ST92185B - SYNC CONTROLLER
SYNC CONTROLLER (Cont'd) 7.5.5 Register Description SYNC CONTROLLER CONTROL AND STATUS REGISTER 0 (SCCS0R) R242 - Read/Write Register Page: 35 Reset value: 0000 0000 (00h)
0 VPOL HPOL VSEP VDLY HSF3 HSF2 HSF1 HSF0
For other cases:
MOD1 0 x x 1 1 MOD0 0 1 1 x x VSEP x 0 1 0 1 CSO alternate function disabled disabled enabled disabled enabled
Bit 7= VPOL. VSYNC Polarity When MOD[1:0] are reset, this bit configures the polarity of the VSYNC input. 0: Negative polarity (leading edge is falling edge) 1: Positive polarity (leading edge is rising edge) For other cases:
MOD1 0 x x 1 1 MOD0 VPOL 0 x VSYNC polarity control 1 0 interlaced 1 1 non-interlaced x 0 interlaced x 1 non-interlaced
Bit 4= VDLY. Vertical Delay control bit. This bit is active only if the Composite Sync mode is enabled. The selection of this bit can effect noise margin (longer delay is better) and the field detection. 0: Vertical is generated after detecting a pulse greater than 16s 1: Vertical is generated after detecting a pulse greater than 32s Bit 3:0= HSF. Horizontal Shift for Field detection. These 4 bits program the delay, in steps of 4s, applied to the HSYNC pulse in order to properly determine the field information by comparison with VSYNC. This value is a chassis constant depending upon the way the separate H/V signals are generated.
Bit 6= HPOL. HSYNC/CSYNC Polarity. 0: Negative polarity (leading edge is falling edge) 1: Positive polarity (leading edge is rising edge) Bit 5= VSEP. Separate Sync When MOD[1:0] are reset: 0: The standard mode using two inputs (VSYNC and HSYNC) is activated. 1: The Composite Sync mode is activated; the HSYNC/CSYNC input will be used to get both H and V signals.
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ST92185B - SYNC CONTROLLER
SYNC CONTROLLER (Cont'd) SYNC CONTROLLER CONTROL AND STATUS REGISTER 1 (SCCS1R) R243 - Read/Write Register Page: 35 Reset value: 0000 0000 (00h)
7 0
Bit 4= HFLG: Horizontal Sync Flag. This bit is read-only. It just copies the Horizontal sync transient information issued by the horizontal pulse shape unit. The bit is read at "1" at during each H sync pulse and lasts to "1" up to 4 s. Bit 3= FSTEN: Field Start Interrupt Enable. 0: The FLDST interrupt is disabled and the external interrupt pin becomes the interrupt input. 1: The FLDST interrupt is enabled and the interrupt from the external pin is disabled. Bit 2= VBIEN: VBI Interrupt Enable. 0: The EOFVBI interrupt is disabled and the external interrupt pin becomes the interrupt input. 1: The EOFVBI interrupt is enabled and the interrupt from the external pin is disabled. Bit 1:0= MOD[1:0]:
& V sync MOD1 MOD0 Hsources chassis 0 0 sync pulses 0 1 reserved from Xtal 1 0 (60 Hz) from Xtal 1 1 (50 Hz) CSO no reserved on-chip timing generator; free-running on-chip timing generator; free-running CSO generator
EOFVBI FLDST FLDEV HFLG FSTEN VBIEN MOD1 MOD0
Bit 7= EOFVBI: End Of VBI Flag. This bit is set to "1" by hardware at the beginning of the line 25 of the current field, when the End of VBI interrupt request is sent to the Core. The EOFVBI flag must be reset by software before the end of the current field. Bit 6= FLDST: Field Start Flag. This bit is set to "1" by hardware on the leading edge of the vertical sync pulse when the field start interrupt request is forwarded to the Core. The FLDST flag must be reset by software before the end of the current field. Bit 5= FLDEV: Field Even Flag. This bit is read-only. It indicates which field is currently running; 0: First field is running 1: Second field is running
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yes yes
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ST92185B - SERIAL PERIPHERAL INTERFACE (SPI)
7.6 SERIAL PERIPHERAL INTERFACE (SPI) 7.6.1 Introduction The Serial Peripheral Interface (SPI) is a general purpose on-chip shift register peripheral. It allows communication with external peripherals via an SPI protocol bus. In addition, special operating modes allow reduced software overhead when implementing I2Cbus and IM-bus communication standards. The SPI uses up to 3 pins: Serial Data In (SDI), Serial Data Out (SDO) and Synchronous Serial Clock (SCK). Additional I/O pins may act as device selects or IM-bus address identifier signals. The main features are: s Full duplex synchronous transfer if 3 I/O pins are used Figure 86. Block Diagram
SDO SDI SCK/INT2
Master operation only s 4 Programmable bit rates s Programmable clock polarity and phase s Busy Flag s End of transmission interrupt s Additional hardware to facilitate more complex protocols 7.6.2 Device-Specific Options Depending on the ST9 variant and package type, the SPI interface signals may not be connected to separate external pins. Refer to the Peripheral Configuration Chapter for the device pin-out.
s
READ BUFFER
SERIAL PERIPHERAL INTERFACE DATA REGISTER ( SPIDR )
*
R253 DATA BUS
END OF TRANSMISSION
INT2
INT2 POLARITY 1 0
MULTIPLEXER
PHASE
BAUD RATE
INTCLK
SPEN BMS ARB BUSY CPOL CPHA SPR1 SPR0
R254
INTERNAL SERIAL CLOCK TO MSPI CONTROL LOGIC
ST9 INTERRUPT INTB0
SERIAL PERIPHERAL CONTROL REGISTER ( SPICR )
* Common for Transmit and Receive
n
VR000347
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ST92185B - SERIAL PERIPHERAL INTERFACE (SPI)
SERIAL PERIPHERAL INTERFACE (Cont'd) 7.6.3 Functional Description The SPI, when enabled, receives input data from the internal data bus to the SPI Data Register (SPIDR). A Serial Clock (SCK) is generated by controlling through software two bits in the SPI Control Register (SPICR). The data is parallel loaded into the 8 bit shift register during a write cycle. This is shifted out serially via the SDO pin, MSB first, to the slave device, which responds by sending its data to the master device via the SDI pin. This implies full duplex transmission if 3 I/O pins are used with both the data-out and data-in synchronized with the same clock signal, SCK. Thus the transmitted byte is replaced by the received byte, eliminating the need for separate "Tx empty" and "Rx full" status bits. When the shift register is loaded, data is parallel transferred to the read buffer and becomes available to the CPU during a subsequent read cycle. The SPI requires three I/O port pins: SCK Serial Clock signal SDO Serial Data Out SDI Serial Data In An additional I/O port output bit may be used as a slave chip select signal. Data and Clock pins IC Bus protocol are open-drain to allow arbitration and multiplexing. Figure 2 below shows a typical SPI network.
Figure 87. A Typical SPI Network
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7.6.3.1 Input Signal Description Serial Data In (SDI) Data is transferred serially from a slave to a master on this line, most significant bit first. In an SBUS/I2C-bus configuration, the SDI line senses the value forced on the data line (by SDO or by another peripheral connected to the S-bus/I2C-bus). 7.6.3.2 Output Signal Description Serial Data Out (SDO) The SDO pin is configured as an output for the master device. This is obtained by programming the corresponding I/O pin as an output alternate function. Data is transferred serially from a master to a slave on SDO, most significant bit first. The master device always allows data to be applied on the SDO line one half cycle before the clock edge, in order to latch the data for the slave device. The SDO pin is forced to high impedance when the SPI is disabled. During an S-Bus or I2C-Bus protocol, when arbitration is lost, SDO is set to one (thus not driving the line, as SDO is configured as an open drain). Master Serial Clock (SCK) The master device uses SCK to latch the incoming data on the SDI line. This pin is forced to a high impedance state when SPI is disabled (SPEN, SPICR.7 = "0"), in order to avoid clock contention from different masters in a multi-master system. The master device generates the SCK clock from INTCLK. The SCK clock is used to synchronize data transfer, both in to and out of the device, through its SDI and SDO pins. The SCK clock type, and its relationship with data is controlled by the CPOL (Clock Polarity) and CPHA (Clock Phase) bits in the Serial Peripheral Control Register (SPICR). This input is provided with a digital filter which eliminates spikes lasting less than one INTCLK period. Two bits, SPR1 and SPR0, in the Serial Peripheral Control Register (SPICR), select the clock rate. Four frequencies can be selected, two in the high frequency range (mostly used with the SPI protocol) and two in the medium frequency range (mostly used with more complex protocols).
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ST92185B - SERIAL PERIPHERAL INTERFACE (SPI)
SERIAL PERIPHERAL INTERFACE (Cont'd)
Figure 88. SPI I/O Pins
n
SCK SDO SDI
SPI
PORT BIT DATA BUS LATCH
SDI
PORT BIT LATCH
SCK INT2
PORT BIT LATCH INT2
SDO
7.6.4 Interrupt Structure The SPI peripheral is associated with external interrupt channel B0 (pin INT2). Multiplexing between the external pin and the SPI internal source is controlled by the SPEN and BMS bits, as shown in Table 1 Interrupt Configuration. The two possible SPI interrupt sources are: - End of transmission (after each byte). - S-bus/I2C-bus start or stop condition. Care should be taken when toggling the SPEN and/or BMS bits from the "0,0" condition. Before changing the interrupt source from the external pin to the internal function, the B0 interrupt channel should be masked. EIMR.2 (External Interrupt Mask Register, bit 2, IMBO) and EIPR.2 (External Interrupt Pending Register bit 2, IMP0) should be "0" before changing the source. This sequence of events is to avoid the generating and reading of spurious interrupts. A delay instruction lasting at least 4 clock cycles (e.g. 2 NOPs) should be inserted between the SPEN toggle instruction and the Interrupt Pending bit reset instruction. The INT2 input Function is always mapped together with the SCK input Function, to allow Start/Stop bit detection when using S-bus/I2C-bus protocols. A start condition occurs when SDI goes from "1" to "0" and SCK is "1". The Stop condition occurs when SDI goes from "0" to "1" and SCK is "1". For both Stop and Start conditions, SPEN = "0" and BMS = "1".
Table 27. Interrupt Configuration
SPEN 0 0 1 BMS 0 1 X Interrupt Source External channel INT2 S-bus/I2C bus start or stop condition End of a byte transmission
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ST92185B - SERIAL PERIPHERAL INTERFACE (SPI)
SERIAL PERIPHERAL INTERFACE (Cont'd) 7.6.5 Working With Other Protocols The SPI peripheral offers the following facilities for operation with S-bus/I 2C-bus and IM-bus protocols: s Interrupt request on start/stop detection s Hardware clock synchronisation s Arbitration lost flag with an automatic set of data line Note that the I/O bit associated with the SPI should be returned to a defined state as a normal I/O pin before changing the SPI protocol. The following paragraphs provide information on how to manage these protocols. 7.6.6 I2C-bus Interface The I 2C-bus is a two-wire bidirectional data-bus, the two lines being SDA (Serial DAta) and SCL (Serial CLock). Both are open drain lines, to allow arbitration. As shown in Figure 5, data is toggled with clock low. An IC bus start condition is the transition on SDI from 1 to 0 with the SCK held high. In a stop condition, the SCK is also high and the transition on SDI is from 0 to 1. During both of these conditions, if SPEN = 0 and BMS = 1 then an interrupt request is performed.
Each transmission consists of nine clock pulses (SCL line). The first 8 pulses transmit the byte (MSB first), the ninth pulse is used by the receiver to acknowledge. Figure 89. S-Bus / I2C-bus Peripheral Compatibility without S-Bus Chip Select
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ST92185B - SERIAL PERIPHERAL INTERFACE (SPI)
SERIAL PERIPHERAL INTERFACE (Cont'd) Table 28. Typical I2C-bus Sequences
Phase Software SPICR.CPOL, CPHA = 0, 0 SPICR.SPEN = 0 SPICR.BMS = 1 SCK pin set as AF output SDI pin set as input Set SDO port bit to 1 SDO pin set as output Open Drain Set SDO port bit to 0 SPICR.SPEN = 1 SDO pin as Alternate Function output load data into SPIDR SPICR.SPEN = 0 Poll SDA line Set SDA line SPICR.SPEN = 1 SDO pin set as output Open Drain SPICR.SPEN = 0 Set SDO port bit to 1 Hardware Notes Set polarity and phase SPI disable START/STOP interrupt Enable START condition receiver START detection Managed by interrupt routine load FFh when receiving end of transmission detection SPI disable only if transmitting only if receiving only if transmitting STOP condition
INITIALIZE
SCK, SDO in HI-Z SCL, SDA = 1, 1
START
SDA = 0, SCL = 1 interrupt request SCL = 0 Start transmission Interrupt request at end of byte transmission SCK, SDO in HI-Z SCL, SDA = 1 SCL = 0 SDA = 1 interrupt request
TRANSMISSION
ACKNOWLEDGE
STOP
Figure 90. SPI Data and Clock Timing (for I2C protocol)
1st BYTE SDA
AcK
th n BYTE
AcK
SCL 1 2 8 9 1 2 8 9
START CONDITION
n
CLOCK PULSE FOR ACKNOWLEDGEMENT DRIVEN BY SOFTWARE
CLOCK PULSE FOR ACKNOWLEDGEMENT DRIVEN BY SW STOP CONDITION
VR000188
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ST92185B - SERIAL PERIPHERAL INTERFACE (SPI)
SERIAL PERIPHERAL INTERFACE (Cont'd) The data on the SDA line is sampled on the low to high transition of the SCL line. SPI working with an I2C-bus To use the SPI with the I 2C-bus protocol, the SCK line is used as SCL; the SDI and SDO lines, externally wire-ORed, are used as SDA. All output pins must be configured as open drain (see Figure 4). Table 2. illustrates the typical I2C-bus sequence, comprising 5 phases: Initialization, Start, Transmission, Acknowledge and Stop. It should be noted that only the first 8 bits are handled by the SPI peripheral; the ACKNOWLEDGE bit must be managed by software, by polling or forcing the SCL and SDO lines via the corresponding I/O port bits. During the transmission phase, the following I2Cbus features are also supported by hardware. Clock Synchronization In a multimaster I2C-bus system, when several masters generate their own clock, synchronization is required. The first master which releases the SCL line stops internal counting, restarting only when the SCL line goes high (released by all the other masters). In this manner, devices using difFigure 91. SPI Arbitration
ST9-1 INTERNAL SERIAL CLOCK SCK
ferent clock sources and different frequencies can be interfaced. Arbitration Lost When several masters are sending data on the SDA line, the following takes place: if the transmitter sends a "1" and the SDA line is forced low by another device, the ARB flag (SPICR.5) is set and the SDO buffer is disabled (ARB is reset and the SDO buffer is enabled when SPIDR is written to again). When BMS is set, the peripheral clock is supplied through the INT2 line by the external clock line (SCL). Due to potential noise spikes (which must last longer than one INTCLK period to be detected), RX or TX may gain a clock pulse. Referring to Figure 6, if device ST9-1 detects a noise spike and therefore gains a clock pulse, it will stop its transmission early and hold the clock line low, causing device ST9-2 to freeze on the 7th bit. To exit and recover from this condition, the BMS bit must be reset; this will cause the SPI logic to be reset, thus aborting the current transmission. An End of Transmission interrupt is generated following this reset sequence.
ST9-2 INTERNAL SERIAL CLOCK SCK
0 MSPI
CONTROL
0 MSPI
CONTROL
LOGIC 1 BHS INT 2 INT 2 1 BHS
LOGIC
ST9-2-SCK
1
2
3
4
5
6
7
SPIKE ST9-1-SCK 1 2 3 4 5 6 7 8
VR001410
n n
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ST92185B - SERIAL PERIPHERAL INTERFACE (SPI)
SERIAL PERIPHERAL INTERFACE (Cont'd) 7.6.7 S-Bus Interface The S-bus is a three-wire bidirectional data-bus, possessing functional features similar to the I2Cbus. As opposed to the I2C-bus, the Start/Stop conditions are determined by encoding the information on 3 wires rather than on 2, as shown in Figure 8. The additional line is referred as SEN. Figure 92. Mixed S-bus and I 2C-bus System
SCL SDA
SPI Working with S-bus The S-bus protocol uses the same pin configuration as the I2C-bus for generating the SCL and SDA lines. The additional SEN line is managed through a standard ST9 I/O port line, under software control (see Figure 4).
SEN 1 START
n
2
3
4
5
6 STOP
VA00440
Figure 93. S-bus Configuration
n
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ST92185B - SERIAL PERIPHERAL INTERFACE (SPI)
SERIAL PERIPHERAL INTERFACE (Cont'd) 7.6.8 IM-bus Interface The IM-bus features a bidirectional data line and a clock line; in addition, it requires an IDENT line to distinguish an address byte from a data byte (Figure 10). Unlike the I2C-bus protocol, the IM-bus protocol sends the least significant bit first; this requires a software routine which reverses the bit order before sending, and after receiving, a data byte. Figure 9 shows the connections between an IM-bus peripheral and an ST9 SPI. The SDO and SDI pins are connected to the bidirectional data pin of the peripheral device. The SDO alternate function is configured as Open-Drain (external 2.5K pull-up resistors are required). With this type of configuration, data is sent to the peripheral by writing the data byte to the SPIDR register. To receive data from the peripheral, the user should write FFh to the SPIDR register, in order to generate the shift clock pulses. As the SDO Figure 94. ST9 and IM-bus Peripheral
VDD 2x 2.5 K
line is set to the Open-Drain configuration, the incoming data bits that are set to "1" do not affect the SDO/SDI line status (which defaults to a high level due to the FFh value in the transmit register), while incoming bits that are set to "0" pull the input line low. In software it is necessary to initialise the ST9 SPI by setting both CPOL and CPHA to "1". By using a general purpose I/O as the IDENT line, and forcing it to a logical "0" when writing to the SPIDR register, an address is sent (or read). Then, by setting this bit to "1" and writing to SPIDR, data is sent to the peripheral. When all the address and data pairs are sent, it is necessary to drive the IDENT line low and high to create a short pulse. This will generate the stop condition.
SCK SDI SDO PORTX ST9 MCU IM-BUS PROTOCOL
n
CLOCK DATA IDENT IM-BUS SLAVE DEVICE
VR001427
Figure 95. IM bus Timing
IDENT
CLOCK LINE
DATA LINE
LSB
1
2
3
4
5
6
MSB
LSB
1
2
3
4
5
6 MSB
VR000172
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ST92185B - SERIAL PERIPHERAL INTERFACE (SPI)
SERIAL PERIPHERAL INTERFACE (Cont'd) 7.6.9 Register Description It is possible to have up to 3 independent SPIs in the same device (refer to the device block diagram). In this case they are named SPI0 thru SPI2. If the device has one SPI converter it uses the register adresses of SPI0. The register map is the following:
Register SPIDR R253 SPICR R254 SPIDR1 R253 SPICR1 R254 SPIDR2 R245 SPICR2 R246 SPIn SPI0 SPI0 SPI1 SPI1 SPI2 SPI2 Page 0 0 7 7 7 7
1: Both alternate functions SCK and SDO are enabled. Note: furthermore, SPEN (together with the BMS bit) affects the selection of the source for interrupt channel B0. Transmission starts when data is written to the SPIDR Register. Bit 6 = BMS: S-bus/I2C-bus Mode Selector. 0: Perform a re-initialisation of the SPI logic, thus allowing recovery procedures after a RX/TX failure. 1: Enable S-bus/I2C-bus arbitration, clock synchronization and Start/ Stop detection (SPI used in an S-bus/I2C-bus protocol). Note: when the BMS bit is reset, it affects (together with the SPEN bit) the selection of the source for interrupt channel B0. Bit 5 = ARB: Arbitration flag bit. This bit is set by hardware and can be reset by software. 0: S-bus/I2C-bus stop condition is detected. 1: Arbitration lost by the SPI in S-bus/I2C-bus mode. Note: when ARB is set automatically, the SDO pin is set to a high value until a write instruction on SPIDR is performed. Bit 4 = BUSY: SPI Busy Flag. This bit is set by hardware. It allows the user to monitor the SPI status by polling its value. 0: No transmission in progress. 1: Transmission in progress. Bit 3 = CPOL: Transmission Clock Polarity. CPOL controls the normal or steady state value of the clock when data is not being transferred. Please refer to the following table and to Figure 11 to see this bit action (together with the CPHA bit). Note: As the SCK line is held in a high impedance state when the SPI is disabled (SPEN = "0"), the SCK pin must be connected to VSS or to V CC through a resistor, depending on the CPOL state. Polarity should be set during the initialisation routine, in accordance with the setting of all peripherals, and should not be changed during program execution.
Note: In the register description on the following pages, register and page numbers are given using the example of SPI0. SPI DATA REGISTER (SPIDR) R253 - Read/Write Register Page: 0 Reset Value: undefined
7 D7 D6 D5 D4 D3 D2 D1 0 D0
Bit 7:0 = D[0:7]: SPI Data. This register contains the data transmitted and received by the SPI. Data is transmitted bit 7 first, and incoming data is received into bit 0. Transmission is started by writing to this register. Note: SPIDR state remains undefined until the end of transmission of the first byte. SPI CONTROL REGISTER (SPICR) R254 - Read/Write Register Page: 0 Reset Value: 0000 0000 (00h)
7
SPEN BMS ARB BUSY CPOL CPHA SPR1
0
SPR0
Bit 7 = SPEN: Serial Peripheral Enable. 0: SCK and SDO are kept tristate.
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ST92185B - SERIAL PERIPHERAL INTERFACE (SPI)
SERIAL PERIPHERAL INTERFACE (Cont'd) Bit 2 = CPHA: Transmission Clock Phase. CPHA controls the relationship between the data on the SDI and SDO pins, and the clock signal on the SCK pin. The CPHA bit selects the clock edge used to capture data. It has its greatest impact on the first bit transmitted (MSB), because it does (or does not) allow a clock transition before the first data capture edge. Figure 11 shows the relationship between CPHA, CPOL and SCK, and indicates active clock edges and strobe times.
CPOL 0 0 1 1 CPHA 0 1 0 1 SCK (in Figure 11) (a) (b) (c) (d)
Bit 1:0 = SPR[1:0]: SPI Rate. These two bits select one (of four) baud rates, to be used as SCK.
SPR1 SPR0 0 0 1 1 0 1 0 1 Clock Divider 8 16 128 256 SCK Frequency (@ INTCLK = 24MHz) 3000kHz 1500kHz 187.5kHz 93.75kHz (T = (T = (T = (T = 0.33s) 0.67s) 5.33s) 10.66s)
Figure 96. SPI Data and Clock Timing
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ST92185B - A/D CONVERTER (A/D)
7.7 A/D CONVERTER (A/D) 7.7.1 Introduction The 8 bit Analog to Digital Converter uses a fully differential analog configuration for the best noise immunity and precision performance. The analog voltage references of the converter are connected to the internal AVDD & AVSS analog supply pins of the chip if they are available, otherwise to the ordinary VDD and V SS supply pins of the chip. The guaranteed accuracy depends on the device (see Electrical Characteristics). A fast Sample/Hold allows quick signal sampling for minimum warping effect and conversion error. 7.7.2 Main Features s 8-bit resolution A/D Converter s Single Conversion Time (including Sampling Time): - 138 internal system clock periods in slow mode (~5.6 s @25Mhz internal system clock); - 78 INTCLK periods in fast mode (~6.5 s @ 12MHZ internal system clock) s Sample/Hold: Tsample= - 84 INTCLK periods in slow mode (~3.4 s @25Mhz internal system clock) - 48 INTCLK periods in fast mode (~4 s @12Mhz internal system clock) s Up to 4 Analog Inputs (the number of inputs is device dependent, see device pinout) Figure 97. A/D Converter Block Diagram
n
s s
s s s
Single/Continuous Conversion Mode External/Internal source Trigger (Alternate synchronization) Power Down mode (Zero Power Consumption) 1 Control Logic Register 1 Data Register
7.7.3 General Description Depending on the device, up to 8 analog inputs can be selected by software. Different conversion modes are provided: single, continuous, or triggered. The continuous mode performs a continuous conversion flow of the selected channel, while in the single mode the selected channel is converted once and then the logic waits for a new hardware or software restart. A data register (ADDTR) is available, mapped in page 62, allowing data storage (in single or continuous mode). The start conversion event can be managed by software, writing the START/STOP bit of the Control Logic Register or by hardware using either: - An external signal on the EXTRG triggered input (negative edge sensitive) connected as an Alternate Function to an I/O port bit - An On Chip Event generated by another peripheral, such as the MFT (Multifunction Timer).
SUCCESSIVE APPROXIMATION REGISTER
Ain0 ST9 BUS S/H DATA REGISTER ANALOG MUX Ain1
Ainx
CONTROL LOGIC
EXTRG
INTRG (On Chip Event)
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ST92185B - A/D CONVERTER (A/D)
A/D CONVERTER (Cont'd) The conversion technique used is successive approximation, with AC coupled analog fully differential comparators blocks plus a Sample and Hold logic and a reference generator. The internal reference (DAC) is based on the use of a binary-ratioed capacitor array. This technique allows the specified monotonicity (using the same ratioed capacitors as sampling capacitor). A Power Down programmable bit sets the A/D converter analog section to a zero consumption idle status. 7.7.3.1 Operating Modes The two main operating modes, single and continuous, can be selected by writing 0 (reset value) or 1 into the CONT bit of the Control Logic Register. Single Mode In single mode (CONT=0 in ADCLR) the STR bit is forced to '0' after the end of channel i-th conversion; then the A/D waits for a new start event. This mode is useful when a set of signals must be sampled at a fixed frequency imposed by a Timer unit or an external generator (through the alternate synchronization feature). A simple software routine monitoring the STR bit can be used to save the current value before a new conversion ends (so to create a signal samples table within the internal memory or the Register File). Furthermore, if the R242.0 bit (register AD-INT, bit 0) is set, at the end of conversion a negative edge on the connected external interrupt channel (see Interrupts Chapter) is generated to allow the reading of the converted data by means of an interrupt routine. Continuous Mode In continuous mode (CONT=1 in ADCLR) a continuous conversion flow is entered by a start event on the selected channel until the STR bit is reset by software. At the end of each conversion, the Data Register (ADCDR) content is updated with the last conversion result, while the former value is lost. When the conversion flow is stopped, an interrupt request is generated with the same modality previously described. 7.7.3.2 Alternate Synchronization This feature is available in both single/continuous modes. The negative edge of external EXTRG signal or the occurrence of an on-chip event generated by another peripheral can be used to synchronize the conversion start with a trigger pulse.
These events can be enabled or masked by programming the TRG bit in the ADCLR Register. The effect of alternate synchronization is to set the STR bit, which is cleared by hardware at the end of each conversion in single mode. In continuous mode any trigger pulse following the first one will be ignored. The synchronization source must provide a pulse (1.5 internal system clock, 125ns @ 12 MHz internal clock) of minimum width, and a period greater (in single mode) than the conversion time (~6.5us @ 12 MHz internal clock). If a trigger occurs when the STR bit is still '1' (conversions still in progress), it is ignored (see Electrical Characteristics). WARNING: If the EXTRG or INTRG signals are already active when TRG bit is set, the conversion starts immediately. 7.7.3.3 Power-Up Operations Before enabling any A/D operation mode, set the POW bit of the ADCLR Register at least 60 s before the first conversion starts to enable the biasing circuits inside the analog section of the converter. Clearing the POW bit is useful when the A/D is not used so reducing the total chip power consumption. This state is also the reset configuration and it is forced by hardware when the core is in HALT state (after a HALT instruction execution). 7.7.3.4 Register Mapping It is possible to have two independent A/D converters in the same device. In this case they are named A/D 0 and A/D 1. If the device has one A/D converter it uses the register addresses of A/D 0. The register map is the following:
Register Address F0h F1h F2h F3-F7h F8h F9h FAh FB-FFh ADn A/D 0 A/D 0 A/D 0 A/D 0 A/D 1 A/D 1 A/D 1 A/D 1 Page 62 (3Eh) ADDTR0 ADCLR0 ADINT0 Reserved ADDTR1 ADCLR1 ADINT1 Reserved
If two A/D converters are present, the registers are renamed, adding the suffix 0 to the A/D 0 registers and 1 to the A/D 1 registers.
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ST92185B - A/D CONVERTER (A/D)
A/D CONVERTER (Cont'd) 7.7.4 Register Description A/D CONTROL LOGIC REGISTER (ADCLR) R241 - Read/Write Register Page: 62 Reset value: 0000 0000 (00h)
7 C2 C1 C0 FS 0 TRG POW CONT STR
This 8-bit register manages the A/D logic operations. Any write operation to it will cause the current conversion to be aborted and the logic to be re-initialized to the starting configuration. Bit 7:5 = C[2:0]: Channel Address. These bits are set and cleared by software. They select channel i conversion as follows:
C2 0 0 0 0 1 C1 0 0 1 1 0 C0 0 1 0 1 0 Channel Enabled Channel 0 Channel 1 Channel 2 Channel 4 Channel 3
0: External/Internal Trigger disabled. 1: Either a negative (falling) edge on the EXTRG pin or an On Chip Event writes a "1" into the STR bit, enabling start of conversion. Note: Triggering by on chip event is available on devices with the multifunction timer (MFT) peripheral. Bit 2 = POW: Power Enable. This bit is set and cleared by software. 0: Disables all power consuming logic. 1: Enables the A/D logic and analog circuitry. Bit 1 = CONT: Continuous/Single Mode Select. This bit it set and cleared by software. 0: Single mode: after the current conversion ends, the STR bit is reset by hardware and the converter logic is put in a wait status. To start another conversion, the STR bit has to be set by software or hardware. 1: Select Continuous Mode, a continuous flow of A/D conversions on the selected channel, starting when the STR bit is set. Bit 0 = STR: Start/Stop. This bit is set and cleared by software. It is also set by hardware when the A/D is synchronized with an external/internal trigger. 0: Stop conversion on channel i. An interrupt is generated if the STR was previously set and the AD-INT bit is set. 1: Start conversion on channel i WARNING: When accessing this register, it is recommended to keep the related A/D interrupt channel masked or disabled to avoid spurious interrupt requests.
Bit 4 = FS: Fast/Slow. This bit is set and cleared by software. 0: Fast mode. Single conversion time: 78 x INTCLK (5.75s at INTCLK = 12 MHz) 1: Slow mode. Single conversion time: 138 x INTCLK (11.5s at INTCLK = 12 MHz) Note: Fast conversion mode is only allowed for internal speeds which do not exceed 12 MHz. Bit 3 = TRG: External/Internal Trigger Enable. This bit is set and cleared by software.
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ST92185B - A/D CONVERTER (A/D)
A/D CONVERTER (Cont'd) A/D CHANNEL i DATA REGISTER (ADDTR) R240 - Read/Write Register Page: 62 Reset value: undefined
7 R.7 R.6 R.5 R.4 R.3 R.2 R.1 0 R.0
A/D INTERRUPT REGISTER (ADINT) Register Page: 62 R242 - Read/write Reset value: 0000 0001 (01h)
7 0 0 0 0 0 0 0 0 AD-INT
The result of the conversion of the selected channel is stored in the 8-bit ADDTR, which is reloaded with a new value every time a conversion ends. Bit 7:0 = R[7:0]: Channel i conversion result.
Bit 7:1 = Reserved. Bit 0 = AD-INT: AD Converter Interrupt Enable. This bit is set and cleared by software. It allows the interrupt source to be switched between the A/D Converter and an external interrupt pin (See Interrupts chapter). 0: A/D Interrupt disabled. External pin selected as interrupt source. 1: A/D Interrupt enabled
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ST92185B - VOLTAGE SYNTHESIS TUNING CONVERTER (VS)
7.8 VOLTAGE SYNTHESIS TUNING CONVERTER (VS) 7.8.1 Description The on-chip Voltage Synthesis (VS) converter allows the generation of a tuning reference voltage in a TV set application. The peripheral is composed of a 14-bit counter that allows the conversion of the digital content in a tuning voltage, available at the VS output pin, by using PWM (Pulse Width Modulation) and BRM (Bit Rate Modulation) techniques. The 14-bit counter gives 16384 steps which allow a resolution of approximately 2 mV over a tuning voltage of 32 V. This corresponds to a tuning resolution of about 40 KHz per step in UHF band (the actual value will depend on the characteristics of the tuner). The tuning word consists of a 14-bit word contained in the registers VSDR1 (R254) and VSDR2 (R255) both located in page 59. Coarse tuning (PWM) is performed using the seven most significant bits. Fine tuning (BRM) is performed using the the seven least significant bits. With all "0"s loaded, the output is 0. As the tuning voltage increases from all "0"s, the number of pulses in one period increases to 128 with all pulses being the same width. For values larger than 128, the PWM takes over and the number of pulses in one period remains constant at 128, but the width changes. At the other end of the scale, when almost all "1"s are loaded, the pulses will start to link together and the number of pulses will decrease. When all "1"s are loaded, the output will be almost 100% high but will have a low pulse (1/16384 of the high pulse). 7.8.2 Output Waveforms Included inside the VS are the register latches, a reference counter, PWM and BRM control circuitry. The clock for the 14-bit reference counter is derived from the main system clock (referred to as INTCLK) after a division by 4. For example, using an internal 12 MHz on-chip clock (see Timing & Clock Controller chapter) leads to a 3 MHz input for the VS counter. From the point of view of the circuit, the seven most significant bits control the coarse tuning, while the seven least significant bits control the fine tuning. From the application and software point of view, the 14 bits can be considered as one binary number. As already mentioned the coarse tuning consists of a PWM signal with 128 steps: we can consider the fine tuning to cover 128 coarse tuning cycles. The VS Tuning Converter is implemented with 2 separate outputs (VSO1 and VSO2) that can drive 2 separate Alternate Function outputs of 2 standard I/O port bits. A control bit allows you to choose which output is activated (only one output can be activated at a time). When a VS output is not selected because the VS is disabled or because the second output is selected, it stays at a logical "one" level, allowing you to use the corresponding I/O port bit either as a normal I/O port bit or for a possible second Alternate Function output. A second control bit allows the VS function to be started (or stopped) by software.
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ST92185B - VOLTAGE SYNTHESIS TUNING CONVERTER (VS)
VOLTAGE SYNTHESIS (Cont'd) PWM Generation The counter increments continuously, clocked at INTCLK divided by 4. Whenever the 7 least significant bits of the counter overflow, the VS output is set. The state of the PWM counter is continuously compared to the value programmed in the 7 most significant bits of the tuning word. When a match occurs, the output is reset thus generating the PWM output signal on the VS pin. This Pulse Width modulated signal must be filtered, using an external RC network placed as close as possible to the associated pin. This provides an analog voltage proportional to the average charge passed to the external capacitor. Thus for a higher mark/space ratio (High time much Figure 99. PWM Generation
greater than Low time) the average output voltage is higher. The external components of the RC network should be selected for the filtering level required for control of the system variable. Figure 98. Typical PWM Output Filter
1K PWM OUT
OUTPUT VOLTAGE
R ext
Cext
COUNTER 127 7-BIT PWM VALUE OVERFLOW OVERFLOW OVERFLOW
000
t
PWM OUTPUT
t
INTCLK/4 x 128
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ST92185B - VOLTAGE SYNTHESIS TUNING CONVERTER (VS)
VOLTAGE SYNTHESIS (Cont'd) Figure 100. PWM Simplified Voltage Output After Filtering (2 examples)
V DD PWMOUT 0V V DD OUTPUT VOLTAGE Vripple (mV) V OUTAVG
0V "CHARGE" "DISCHARGE" "CHARGE" "DISCHARGE"
V
DD
PWMOUT 0V V DD V ripple (mV) OUTPUT VOLTAGE 0V "CHARGE" "DISCHARGE" "CHARGE" "DISCHARGE"
VR01956
V OUTAVG
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ST92185B - VOLTAGE SYNTHESIS TUNING CONVERTER (VS)
VOLTAGE SYNTHESIS (Cont'd) BRM Generation The BRM bits allow the addition of a pulse to widen a standard PWM pulse for specific PWM cycles. This has the effect of "fine-tuning" the PWM Duty cycle (without modifying the base duty cycle), thus, with the external filtering, providing additional fine voltage steps. The incremental pulses (with duration of TINTCLK/ 4) are added to the beginning of the original PWM pulse and thus cause the PWM high time to be extended by this time with a corresponding reduction in the low time. The PWM intervals which are added to are specified in the lower 7 bits of the tuning word and are encoded as shown in the following table.
Table 29. 7-Bit BRM Pulse Addition Positions
Fine Tuning 0000001 0000010 0000100 0001000 0010000 0100000 1000000 No. of Pulses added at the following Cycles 64 32, 96 16, 48, 80, 112 8, 24,... 104, 120 4, 12,... 116, 124 2, 6,... 122, 126 1, 3,... 125, 127
The BRM values shown may be combined together to provide a summation of the incremental pulse intervals specified. The pulse increment corresponds to the PWM resolution.
Figure 101. Simplified Filtered Voltage Output Schematic with BRM added
= VDD PWMOUT 0V VDD BRM = 1
OUTPUT VOLTAGE
=
=
BRM = 0
0V
TINTCLK/4
BRM EXTENDED PULSE
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ST92185B - VOLTAGE SYNTHESIS TUNING CONVERTER (VS)
VOLTAGE SYNTHESIS (Cont'd) 7.8.3 Register Description VS DATA AND CONTROL REGISTER (VSDR1) R254 - Read/Write Register Page: 59 Reset Value: 0000 0000 (00h)
7 VSE 6 5 4 VD12 3 VD11 2 VD10 1 VD9 0 VD8
1
VS DATA AND CONTROL (VSDR2) R255 - Read/Write Register Page: 59 Reset Value: 0000 0000 (00h)
7 VD7 VD6 VD5 VD4 VD3
REGISTER
2
0 VD2 VD1 VD0
VSWP VD13
Bit 7 = VSE: VS enable bit. 0: VS Tuning Converter disabled (i.e. the clock is not forwarded to the VS counter and the 2 outputs are set to 1 (idle state) 1: VS Tuning Converter enabled. Bit 6 = VSWP: VS Output Select This bit controls which VS output is enabled to output the VS signal. 0: VSO1 output selected 1: VSO2 output selected Bit 5:0 = VD[13:8] Tuning word bits. These bits are the 6 most significant bits of the Tuning word forming the PWM selection. The VD13 bit is the MSB.
Bit 7:0 = VD[7:0] Tuning word bits. These bits are the 8 least significant data bits of the VS Tuning word. All bits are accessible. Bits VD6 - VD0 form the BRM pulse selection. VD7 is the LSB of the 7 bits forming the PWM selection.
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ST92185B - PWM GENERATOR
7.9 PWM GENERATOR 7.9.1 Introduction The PWM (Pulse Width Modulated) signal generator allows the digital generation of up to 8 analog outputs when used with an external filtering network. The unit is based around an 8-bit counter which is driven by a programmable 4-bit prescaler, with an input clock signal equal to the internal clock INTCLK divided by 2. For example, with a 12 MHz Internal clock, using the full 8-bit resolution, a freFigure 102. PWM Block Diagram.
INTCLK/2
quency range from 1465 Hz up to 23437 Hz can be achieved. Higher frequencies, with lower resolution, can be achieved by using the autoclear register. As an example, with a 12 MHz Internal clock, a maximum PWM repetition rate of 93750 Hz can be reached with 6-bit resolution. Note: The number of output pins is device dependant. Refer to the device pinout description.
Control Logic
Autoclear Compare 7 Compare 6 ST9 Register Bus Compare 5 Compare 4 Compare 3 Compare 2
8 Bit Counter
4 Bit Presc.
PWM7
Compare 1 Compare 0 PWM0
OUTPUT LOGIC
VR01765
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ST92185B - PWM GENERATOR
PWM GENERATOR (Cont'd) Up to 8 PWM outputs can be selected as Alternate Functions of an I/O port. Each output bit is independently controlled by a separate Compare Register. When the value programmed into the Compare Register and the counter value are equal, the corresponding output bit is set. The output bit is reset by a counter clear (by overflow or autoclear), generating the variable PWM signal. Each output bit can also be complemented or disabled under software control.
7.9.2 Register Mapping The ST9 can have one or two PWM Generators. Each has 13 registers mapped in page 59 (PWM0) or page 58 (PWM1). In the register description on the following pages, the register page refers to PWM0 only.
Register Address R240 R241 R242 R243 R244 R245 R246 R247 R248 R249 R250 R251 R252 R253- R255 Register CM0 CM1 CM2 CM3 CM4 CM5 CM6 CM7 ACR CRR PCTLR OCPLR OER -- Function Ch. 0 Compare Register Ch. 1 Compare Register Ch. 2 Compare Register Ch. 3 Compare Register Ch. 4 Compare Register Ch. 5 Compare Register Ch. 6 Compare Register Ch. 7 Compare Register Autoclear Register Counter Read Register Prescaler/ Reload Reg. Output Complement Reg. Output Enable Register Reserved
Figure 103. PWM Action When Compare Register = 0 (no complement)
PWM CLOCK Counter=Autoclear value Counter=0 Counter=1
PWM OUTPUT VR0A1814
Figure 104. PWM Action When Compare Register = 3 (no complement)
PWM CLOCK
Counter=Autoclear value
Counter=0
Counter=3
PWM OUTPUT VR001814
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ST92185B - PWM GENERATOR
PWM GENERATOR (Cont'd) 7.9.2.1 Register Description COMPARE REGISTER 0 (CM0) R240 - Read/Write Register Page: 59 Reset Value: 0000 0000 (00h)
7 0 CM0.7 CM0.6 CM0.5 CM0.4 CM0.3 CM0.2 CM0.1 CM0.0
COMPARE REGISTER 4 (CM4) R244 - Read/Write Register Page: 59 Reset Value: 0000 0000 (00h)
7 0 CM4.7 CM4.6 CM4.5 CM4.4 CM4.3 CM4.2 CM4.1 CM4.0
This is the compare register controlling PWM output 0. When the programmed content is equal to the counter content, a SET operation is performed on PWM output 0 (if the output has not been complemented or disabled). Bit 7:0 = CM0.[7:0]: PWM Compare value Channel 0. COMPARE REGISTER 1 (CM1) R241 - Read/Write Register Page: 59 Reset Value: 0000 0000 (00h)
7 0 CM1.7 CM1.6 CM1.5 CM1.4 CM1.3 CM1.2 CM1.1 CM1.0
This is the compare register controlling PWM output 4. COMPARE REGISTER 5 (CM5) R245 - Read/Write Register Page: 59 Reset Value: 0000 0000 (00h)
7 0 CM5.7 CM5.6 CM5.5 CM5.4 CM5.3 CM5.2 CM5.1 CM5.0
This is the compare register controlling PWM output 5. COMPARE REGISTER 6 (CM6) R246 - Read/Write Register Page: 59 Reset Value: 0000 0000 (00h)
7 0 CM6.7 CM6.6 CM6.5 CM6.4 CM6.3 CM6.2 CM6.1 CM6.0
This is the compare register controlling PWM output 1. COMPARE REGISTER 2 (CM2) R242 - Read/Write Register Page: 59 Reset Value: 0000 0000 (00h)
7 0 CM2.7 CM2.6 CM2.5 CM2.4 CM2.3 CM2.2 CM2.1 CM2.0
This is the compare register controlling PWM output 6.
This is the compare register controlling PWM output 2. COMPARE REGISTER 3 (CM3) R243 - Read/Write Register Page: 59 Reset Value: 0000 0000 (00h)
7 0 CM3.7 CM3.6 CM3.5 CM3.4 CM3.3 CM3.2 CM3.1 CM3.0
COMPARE REGISTER 7 (CM7) R247 - Read/Write Register Page: 59 Reset Value: 0000 0000 (00h)
7 0 CM7.7 CM7.6 CM7.5 CM7.4 CM7.3 CM7.2 CM7.1 CM7.0
This is the compare register controlling PWM output 7.
This is the compare register controlling PWM output 3.
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ST92185B - PWM GENERATOR
PWM GENERATOR (Cont'd) AUTOCLEAR REGISTER (ACR) R248 - Read/Write Register Page: 59 Reset Value: 1111 1111 (FFh)
7 AC7 AC6 AC5 AC4 AC3 AC2 AC1 0 AC0
PRESCALER AND CONTROL (PCTL) R250 - Read/Write Register Page: 59 Reset Value: 0000 1100 (0Ch)
7 PR3 PR2 PR1 PR0 1 1
REGISTER
0 CLR CE
This register behaves exactly as a 9th compare Register, but its effect is to clear the CRR counter register, so causing the desired PWM repetition rate. The reset condition generates the free running mode. So, FFh means count by 256. Bit 7:0 = AC[7:0]: Autoclear Count Value. When 00 is written to the Compare Register, if the ACR register = FFh, the PWM output bit is always set except for the last clock count (255 set and 1 reset; the converse when the output is complemented). If the ACR content is less than FFh, the PWM output bit is set for a number of clock counts equal to that content (see Figure 2). Writing the Compare register constant equal to the ACR register value causes the output bit to be always reset (or set if complemented). Example: If 03h is written to the Compare Register, the output bit is reset when the CRR counter reaches the ACR register value and set when it reaches the Compare register value (after 4 clock counts, see Figure 3). The action will be reversed if the output is complemented. The PWM mark/ space ratio will remain constant until changed by software writing a new value in the ACR register. COUNTER REGISTER (CRR) R249 - Read Only Register Page: 59 Reset Value: 0000 0000 (00h)
7 CR7 CR6 CR5 CR4 CR3 CR2 CR1 0 CR0
Bit 7:4 = PR[3:0] PWM Prescaler value. These bits hold the Prescaler preset value. This is reloaded into the 4-bit prescaler whenever the prescaler (DOWN Counter) reaches the value 0, so determining the 8-bit Counter count frequency. The value 0 corresponds to the maximum counter frequency which is INTCLK/2. The value Fh corresponds to the maximum frequency divided by 16 (INTCLK/32). The reset condition initializes the Prescaler to the Maximum Counter frequency.
PR[3:0] 0 1 2 .. Fh Divider Factor 1 2 3 .. 16 Frequency INTCLK/2 (Max.) INTCLK/4 INTCLK/6 .. INTCLK/32 (Min.)
Bit 3:2 = Reserved. Forced by hardware to "1" Bit 1 = CLR: Counter Clear. This bit when set, allows both to clear the counter, and to reload the prescaler. The effect is also to clear the PWM output. It returns "0" if read. Bit 0 = CE: Counter Enable. This bit enables the counter and the prescaler when set to "1". It stops both when reset without affecting their current value, allowing the count to be suspended and then restarted by software "on fly".
This read-only register returns the current counter value when read. The 8 bit Counter is initialized to 00h at reset, and is a free running UP counter. Bit 7:0 = CR[7:0]: Current Counter Value.
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ST92185B - PWM GENERATOR
PWM GENERATOR (Cont'd) OUTPUT COMPLEMENT REGISTER (OCPL) R251- Read/Write Register Page 59 Reset Value: 0000 0000 (00h)
7 0
OCPL.7 OCPL.6OCPL.5 OCPL.4OCPL.3 OCPL.2 OCPL.1OCPL.0
OUTPUT ENABLE REGISTER (OER) R252 - Read/Write Register Page: 59 Reset Value: 0000 0000 (00h)
7 0 OE.7 OE.6 OE.5 OE.4 OE.3 OE.2 OE.1 OE.0
This register allows the PWM output level to be complemented on an individual bit basis. In default mode (reset configuration), each comparison true between a Compare register and the counter has the effect of setting the corresponding output. At counter clear (either by autoclear comparison true, software clear or overflow when in free running mode), all the outputs are cleared. By setting each individual bit (OCPL.x) in this register, the logic value of the corresponding output will be inverted (i.e. reset on comparison true and set on counter clear). Example: When set to "1", the OCPL.1 bit complements the PWM output 1. Bit 7 = OCPL.7: Complement PWM Output 7. Bit 6 = OCPL.6: Complement PWM Output 6. Bit 5 = OCPL.5: Complement PWM Output 5. Bit 4 = OCPL.4: Complement PWM Output 4. Bit 3 = OCPL.3: Complement PWM Output 3. Bit 2 = OCPL.2: Complement PWM Output 2. Bit 1 = OCPL.1: Complement PWM Output 1. Bit 0 = OCPL.0: Complement PWM Output 0.
These bits are set and cleared by software. 0: Force the corresponding PWM output to logic level 1. This allows the port pins to be used for normal I/O functions or other alternate functions (if available). 1: Enable the corresponding PWM output. Example: Writing 03h into the OE Register will enable only PWM outputs 0 and 1, while outputs 2, 3, 4, 5, 6 and 7 will be forced to logic level "1". Bit 7 = OE.7: Output Enable PWM Output 7. Bit 6 = OE.6: Output Enable PWM Output 6. Bit 5 = OE.5: Output Enable PWM Output 5. Bit 4 = OE.4: Output Enable PWM Output 4. Bit 3 = OE.3: Output Enable PWM Output 3. Bit 2 = OE.2: Output Enable PWM Output 2. Bit 1 = OE.1: Output Enable PWM Output 1. Bit 0 = OE.0: Output Enable PWM Output 0.
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ST92185B - ELECTRICAL CHARACTERISTICS
8 ELECTRICAL CHARACTERISTICS
ABSOLUTE MAXIMUM RATINGS
Symbol VDD VSSA VDDA VI VAI VO TSTG IINJ Supply Voltage Analog Ground Analog Supply Voltage Input Voltage Analog Input Voltage (A/D Converter) Output Voltage Storage Temperature Pin Injected Current Maximum Accumulated Pin Injected Current In Device - 50 to +5 0 mA Parameter Value VSS - 0.3 to VSS + 6.5 VSS - 0.3 to VSS + 0.3 VDD -0.3 to VDD +0.3 VSS - 0.3 to VDD +0.3 VSS - 0.3 to VDD +0.3 VSSA - 0.3 to VDDA +0.3 VSS - 0.3 to VDD + 0.3 - 55 to + 150 - 5 to + 5 Unit V V V V V V C mA
Note: Stress above those listed as "Absolute maximum ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these conditions is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability.
RECOMMENDED OPERATING CONDITIONS
Symbol TA VDD VDDA fOSCE fOSCI Operating Temperature Supply Voltage Analog Supply Voltage (PLL) External Oscillator Frequency Internal Clock Frequency (INTCLK) Parameter Value Min. 0 4.5 4.5 3.3 Max. 70 5.5 5.5 8.7 24 Unit C V V MHz MHz
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ST92185B - ELECTRICAL CHARACTERISTICS
DC ELECTRICAL CHARACTERISTICS (VDD= 5V +/-10%; TA= 0 to 70C; unless otherwise specified)
Symbol VIHCK VILCK VIH VIL VIH VIL VIHRS VILRS VHYRS VIHY VIHVH VILVH VHYHV VOH VOL IWPU ILKIO ILKRS ILKAD ILKOS Parameter Clock In high level Clock in low level Input high level Input low level Input high level Input low level Reset in high level Reset in low level Reset in hysteresis P2.(1:0) input hysteresis HSYNC/VSYNC input high level HSYNC/VSYNC input low level HSYNC/VSYNC input hysteresis Output high level Output low level Weak pull-up current I/O pin input leakage current Reset pin input A/D pin input leakage current OSCIN pin input leakage current Push-pull Ild=-0.8mA Push-pull ld=+1.6mA bidir. state VOL= 3V VOL= 7V 0167/178
ST92185B - ELECTRICAL CHARACTERISTICS
AC ELECTRICAL CHARACTERISTICS PIN CAPACITANCE (VDD= 5V +/-10%; TA= 0 to 70C; unless otherwise specified))
Symbol CIO Parameter Pin Capacitance Digital Input/Output Conditions Value min max 10 Unit pF
CURRENT CONSUMPTION (VDD= 5V +/-10%; TA= 0 to 70C; unless otherwise specified) Symbol IDD1 IDDA1 IDD2 IDDA2 Parameter Run Mode Current Run Mode Analog Current (pin VDDA) HALT Mode Current HALT Mode Analog Current (pin VDDA) Conditions notes 1,2; all On Timing Controller On notes 1,4 notes 1,4 Value min typ. 70 35 10 40 max 100 50 100 100 Unit mA mA A A
Notes: 1. Port 0 is configured in push-pull output mode (output is high). Ports 2, 3, 4 and 5 are configured in bi-directional weak pull-up mode resistor. The external CLOCK pin (OSCIN) is driven by a square wave external clock at 8 MHz. The internal clock prescaler is in divide-by-1 mode. 2. The CPU is fed by a 24 MHz frequency issued by the Main Clock Controller. VSYNC is tied to VSS, HSYNC is driven by a 15625Hz clock. All peripherals working including Display. 3. The CPU is fed by a 24 MHz frequency issued by the Main Clock Controller. VSYNC is tied to VSS, HSYNC is driven by a 15625Hz clock. The TDSRAM interface and the Slicers are working; the Display controller is not working. 4. VSYNC and HSYNC tied to VSS. External CLOCK pin (OSCIN) is hold low. All peripherals are disabled.
EXTERNAL INTERRUPT TIMING TABLE (rising or falling edge mode) (VDD= 5V +/-10%; TA= 0 to 70C; unless otherwise specified))
Symbol TwLR TwHR Parameter low level pulse width high level pulse width Conditions INTCLK=24 MHz. TpC+12 TpC+12 Value min 95 95 max ns ns Unit
TpC is the INTCLK clock period.
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ST92185B - ELECTRICAL CHARACTERISTICS
AC ELECTRICAL CHARACTERISTICS (Cont'd) SPI TIMING TABLE (VDD= 5V +/-10%; TA= 0 to 70C; Cload= 50pF)
Symbol TsDI ThDI TdOV ThDO TwSKL TwSKH Parameter Input Data Set-up Time Input Data Hold Time SCK to Output Data Valid Output Data Hold Time SCK Low Pulse Width SCK High Pulse Width tbd tbd tbd (1) OSCIN/2 as internal Clock Condition Value min tbd 1INTCLK +100ns tbd max Unit ns ns ns ns ns ns
(1) TpC is the OSCIN clock period; TpMC is the "Main Clock Frequency" period.
SKEW CORRECTOR TIMING TABLE (VDD= 5V +/-10%, TA= 0 to 70C, unless otherwise specified)
Symbol Tjskw Parameter Jitter on RGB output Conditions 36 MHz Skew corrector clock frequency max Value 5* Unit ns
(*) The OSD jitter is measured from leading edge to leading edge of a single character row on consecutive TV lines. The value is an envelope of 100 fields
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ST92185B - ELECTRICAL CHARACTERISTICS
AC ELECTRICAL CHARACTERISTICS (Cont'd) OSD DAC CHARACTERISTICS (ROM DEVICES ONLY) (VDD= 5V +/-10%, TA= 0 to 70C, unless otherwise specified).
Symbol Parameter Output impedance: FB,R,G,B Output voltage: FB,R,G,B code= 111 code= 011 code= 000 FB= 1 FB= 0 Global voltage accuracy 2.4 0 Cload= 20pF RL = 100K 1.000 0.450 0.025 2.7 0.025 1.250 0.500 0.080 3.4 0.080 +/-5 V V V V V % Conditions Value min 300 typical 500 max 700 Unit Ohm
OSD DAC CHARACTERISTICS (EPROM AND OTP DEVICES ONLY) (VDD= 5V +/-10%, TA= 0 to 70C, unless otherwise specified).
Symbol Parameter Output impedance: FB,R,G,B Output voltage: FB,R,G,B code= 111 code= 011 code= 000 FB= 1 FB= 0 Global voltage accuracy VDD-0.8 0.400 +/-5 Cload= 20pF RL = 100K 1.100 0.600 0.200 1.400 0.800 0.350 V V V V V % Conditions Value min 300 typical 500 max 700 Unit Ohm
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ST92185B - ELECTRICAL CHARACTERISTICS
AC ELECTRICAL CHARACTERISTICS (Cont'd) A/D CONVERTER, EXTERNAL TRIGGER TIMING TABLE (VDD= 5V +/-10%; TA= 0 to 70C; unless otherwise specified
Symbol Tlow Thigh Text Tstr Tlow Thigh Text Tstr Parameter Pulse Width Pulse Distance Period/fast Mode Start Conversion Delay Core Clock issued by Timing Controller Pulse Width Pulse Distance Period/fast Mode Start Conversion Delay ns ns s ns 78+1 INTCLK 0.5 1.5 OSCIN divide by 2;min/max OSCIN divide by 1; min/max Value min 1.5 INTCLK max Unit ns ns s INTCLK
A/D CONVERTER. ANALOG PARAMETERS TABLE (VDD= 5V +/-10%; TA= 0 to 70C; unless otherwise specified))
Parameter Analog Input Range Conversion Time Fast/Slow Sample Time Fast/Slow Power-up Time Resolution Differential Non Linearity Integral Non Linearity Absolute Accuracy Input Resistance Hold Capacitance
Notes: (*) (**) (1) (2) (3) (4)
Value typ (*) min VSS 78/138 51.5/87.5 60 8 3 4 2 5 5 3 1.5 1.92 max VDD
Unit (**) V INTCLK INTCLK s bits LSBs LSBs LSBs Kohm pF
Note
(1,2) (1)
(4) (4) (4) (3)
The values are expected at 25 Celsius degrees with VDD= 5V 'LSBs' , as used here, as a value of VDD/256 @ 24 MHz external clock including Sample time it must be considered as the on-chip series resistance before the sampling capacitor DNL ERROR= max {[V(i) -V(i-1)] / LSB-1} INL ERROR= max {[V(i) -V(0)] / LSB-i} ABSOLUTE ACCURACY= overall max conversion error
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ST92185B - GENERAL INFORMATION
9 GENERAL INFORMATION
9.1 PACKAGE MECHANICAL DATA Figure 105. 56-Pin Shrink Plastic Dual In Line Package, 600-mil Width
Dim. A A1 A2 b b2 C D E E1 e eA eB L PDIP56S N
mm Min 0.38 3.18 0.41 0.89 0.20 50.29 15.01 12.32 1.78 15.24 17.78 2.92 5.08 0.115 14.73 0.485 0.38 0.008 53.21 1.980 Typ Max 6.35 0.015 4.95 0.125 Min
inches Typ Max 0.250 0.195 0.016 0.035 0.015 2.095 0.591 0.580 0.070 0.600 0.700 0.200
Number of Pins 56
Figure 106. 42-Pin Shrink Plastic Dual In-Line Package, 600-mil Width
Dim. A A1 A2 b b2 C D E E1 e eA eB eC PDIP42S L N
mm Min 0.51 3.05 0.46 0.56 1.02 1.14 0.23 15.24 1.78 15.24 18.54 0.00 2.54 1.52 0.000 Typ Max 5.08 0.020 Min
inches Typ Max 0.200
3.81 4.57 0.120 0.150 0.180 0.018 0.022 0.040 0.045
0.25 0.38 0.009 0.010 0.015 16.00 0.600 0.070 0.600 0.730 0.060 0.630
36.58 36.83 37.08 1.440 1.450 1.460 12.70 13.72 14.48 0.500 0.540 0.570
3.30 3.56 0.100 0.130 0.140 Number of Pins 42
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ST92185B - GENERAL INFORMATION
PACKAGE MECHANICAL DATA (Cont'd) Figure 107. 64-Pin Thin Quad Flat Package
mm Min 0.05 Typ Max 1.60 0.15 0.002 Min inches Typ Max 0.063 0.006
Dim A A1 A2 B C D D1 D3 E E1 E3 e K L L1 L1 L N K
1.35 1.40 1.45 0.053 0.055 0.057 0.30 0.37 0.45 0.012 0.015 0.018 0.09 16.00 14.00 12.00 16.00 14.00 12.00 0.80 0 3.5 1.00 64 ND 16 7 0.039 NE 16 0.20 0.004 0.630 0.551 0.472 0.630 0.551 0.472 0.031 0.008
0.45 0.60 0.75 0.018 0.024 0.030 Number of Pins
Figure 108. 56-Pin Shrink Ceramic Dual In Line Package, 600-mil Width
Dim. A A1 B B1 C D D1 E1 e G G1 G2 G3 G4 0.76 0.38 0.76 0.23 mm Min Typ Max 4.17 0.030 0.46 0.56 0.015 0.018 0.022 0.89 1.02 0.030 0.035 0.040 0.25 0.38 0.009 0.010 0.015 48.01 1.78 1.890 0.070 Min inches Typ Max 0.164
50.04 50.80 51.56 1.970 2.000 2.030 14.48 14.99 15.49 0.570 0.590 0.610 14.12 14.38 14.63 0.556 0.566 0.576 18.69 18.95 19.20 0.736 0.746 0.756 1.14 0.045 11.05 11.30 11.56 0.435 0.445 0.455 15.11 15.37 15.62 0.595 0.605 0.615 2.92 1.40 56 5.08 0.115 0.055 Number of Pins 0.200
CDIP56SW
L S N
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ST92185B - GENERAL INFORMATION
Figure 109. 42-Pin Shrink Ceramic Dual In-Line Package, 600-mil Width
Dim. A A1 B B1 C D D1 E1 e G G1 G2 G3 G4 0.76 0.38 0.76 0.23 mm Min Typ Max 4.01 0.030 0.46 0.56 0.015 0.018 0.022 0.89 1.02 0.030 0.035 0.040 0.25 0.38 0.009 0.010 0.015 35.56 1.78 1.400 0.070 Min inches Typ Max 0.158
36.68 37.34 38.00 1.444 1.470 1.496 14.48 14.99 15.49 0.570 0.590 0.610 14.12 14.38 14.63 0.556 0.566 0.576 18.69 18.95 19.20 0.736 0.746 0.756 1.14 0.045 11.05 11.30 11.56 0.435 0.445 0.455 15.11 15.37 15.62 0.595 0.605 0.615 2.92 0.89 42 5.08 0.115 0.035 Number of Pins 0.200
CDIP42SW
L S N
Figure 110. 64-Pin Ceramic Quad Flat Package
Dim A A1 B C D D3 e G G2 L 0 CQFP064W N
mm Min Typ 0.50 Max 3.27 Min
inches Typ 0.020 Max 0.129
0.30 0.35 0.45 0.012 0.014 0.018 0.13 0.15 0.23 0.005 0.006 0.009 16.65 17.20 17.75 0.656 0.677 0.699 12.00 0.80 12.70 0.96 0.35 0.80 8.31 64 0.472 0.031 0.500 0.038 0.014 0.031 0.327
D1 13.57 13.97 14.37 0.534 0.550 0.566
Number of Pins
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ST92185B - GENERAL INFORMATION
9.2 ORDERING INFORMATION Each device is available for production in a user programmable version (OTP) as well as in factory coded version (ROM). OTP devices are shipped to customer with a default blank content FFh, while ROM factory coded parts contain the code sent by customer. The common EPROM versions for debugging and prototyping features the maximum memory size and peripherals of the family. Care must be taken to only use resources available on the target device. Figure 111. ROM Factory Coded Device Types
TEMP. DEVICE PACKAGE RANGE / XXX Code name (defined by STMicroelectronics) 1= standard 0 to +70 C
9.2.1 Transfer Of Customer Code Customer code is made up of the ROM contents and the list of the selected options (if any). The ROM contents are to be sent on diskette, or by electronic means, with the hexadecimal file generated by the development tool. All unused bytes must be set to FFh.
BN= Plastic SDIP56 BJ= Plastic SDIP42 T= Plastic TQFP64 ST92185B1 ST92185B2 ST92185B3
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ST92185B - GENERAL INFORMATION
STMicroelectronics OPTION LIST
ST92185B
............................ ............................ ............................ Contact: ............................ Phone No: . . . . . . . . . . . . . . . . . . . . . . . . . . . . Reference/ROM Code* : . . . . . . . . . . . . . . . . . . *The ROM code name assigned by ST. STMicroelectronics reference: Device: [ ] ST92185B1B1 [ ] ST92185B2B1 [ ] ST92185B3B1 Package : [ ] SDIP42 [ ] SDIP56 [ ] TQFP64 Temperature Range : 0 to 70 C Software Development: [ ] STMicroelectronics [ ] Customer [ ] External laboratory Customer: Address:
Special Marking: [ ] No [ ] Yes "_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _" For marking, one line is possible with maximum 14 characters. Authorized characters are letters, digits, '.', '-', '/' and spaces only. Please consult your local ST Microelectronics sales office for other marking details if required. Notes :
OSD Code : [ ] OSD File Filename [........ .OSD] Quantity forecast : [..................] k units per year For a period of : [..................] years Preferred Production start dates : [../../..] (YY/MM/DD) Date Customer Signature :
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ST92185B - REVISION HISTORY
10 REVISION HISTORY
Rev. 1.0 1.1 Main Changes First release on DMS 16K ROM added / TQFP64 added p1, changed device summary; added one feature (pin-compatible with...) and changed one feature (Pin-compatible EPROM, etc.). Added Option List. Added Section 10 on page 177. Updated Figure 3 on page 10 and Figure 5 on page 12. Changed Non-linearity values in A/D Converter Analog Parameters Table. Modified Table 9 on page 59. Modified Section 4.2 on page 57. Modification of the absolute maximum rating of the Supply Voltage value in Section 8 on page 166. Date 01/11/00 03/15/00 11 Oct 2001 16 Jan 2002
1.2 1.3
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