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INTEGRATED CIRCUITS
XA-G37 XA 16-bit microcontroller family
32K OTP, 512 B RAM, watchdog, 2 UARTs
Product data Replaces datasheet XA-G3 of 2001 Jun 25 2002 Mar 25
Philips Semiconductors
Philips Semiconductors
Product data
XA 16-bit microcontroller family
32K OTP, 512 B RAM, watchdog, 2 UARTs
XA-G37
FAMILY DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SPECIFIC FEATURES OF THE XA-G37 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ORDERING INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PIN CONFIGURATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44-Pin PLCC Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44-Pin LQFP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . LOGIC SYMBOL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PIN DESCRIPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SPECIAL FUNCTION REGISTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . XA-G37 TIMER/COUNTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Timer 0 and Timer 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . New Enhanced Mode 0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Mode 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Mode 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Mode 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . New Timer-Overflow Toggle Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Timer T2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Capture Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Auto-Reload Mode (Up or Down Counter) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Baud Rate Generator Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Programmable Clock-Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . WATCHDOG TIMER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Watchdog Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Watchdog Control Register (WDCON) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Watchdog Detailed Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . WDCON Register Bit Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . UARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Serial Port Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TI Flag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-bit Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bypassing Double Buffering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Note Regarding Older XA-G37 Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CLOCKING SCHEME/BAUD RATE GENERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Using Timer 2 to Generate Baud Rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Prescaler Select for Timer Clock (TCLK) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . UART INTERRUPT SCHEME . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Error Handling, Status Flags and Break Detect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Multiprocessor Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Automatic Address Recognition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I/O PORT OUTPUT CONFIGURATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . EXTERNAL BUS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RESET OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . POWER REDUCTION MODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . INTERRUPTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ABSOLUTE MAXIMUM RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DC ELECTRICAL CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AC ELECTRICAL CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AC ELECTRICAL CHARACTERISTICS (VDD = 4.5 V TO 5.5 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AC ELECTRICAL CHARACTERISTICS (VDD = 2.7 V TO 4.5 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . EPROM CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Security Bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . REVISION HISTORY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 1 1 2 2 2 2 3 4 5 8 8 9 9 9 9 10 10 10 10 11 11 13 13 13 13 14 14 15 15 15 15 15 16 16 16 17 17 17 17 19 19 19 19 19 20 21 21 22 22 23 31 31 34
2002 Mar 25
i
Philips Semiconductors
Product data
XA 16-bit microcontroller family
32K OTP, 512 B RAM, watchdog, 2 UARTs
XA-G37
FAMILY DESCRIPTION
The Philips Semiconductors XA (eXtended Architecture) family of 16-bit single-chip microcontrollers is powerful enough to easily handle the requirements of high performance embedded applications, yet inexpensive enough to compete in the market for high-volume, low-cost applications. The XA family provides an upward compatibility path for 80C51 users who need higher performance and 64k or more of program memory. Existing 80C51 code can also easily be translated to run on XA microcontrollers. The performance of the XA architecture supports the comprehensive bit-oriented operations of the 80C51 while incorporating support for multi-tasking operating systems and high-level languages such as C. The speed of the XA architecture, at 10 to 100 times that of the 80C51, gives designers an easy path to truly high performance embedded control. The XA architecture supports:
* Instruction set tailored for high level language support * Multi-tasking and real-time executives that include up to 32
vectored interrupts, 16 software traps, segmented data memory, and banked registers to support context switching
* Low power operation, which is intrinsic to the XA architecture,
includes power-down and idle modes. More detailed information on the core is available in the XA User Guide.
SPECIFIC FEATURES OF THE XA-G37
* 20-bit address range, 1 megabyte each program and data space.
(Note that the XA architecture supports up to 24 bit addresses.)
* Upward compatibility with the 80C51 architecture * 16-bit fully static CPU with a 24-bit program and data address
range
* 2.7 V to 5.5 V operation * 32K bytes on-chip EPROM program memory * 512 bytes of on-chip data RAM * Three counter/timers with enhanced features
(equivalent to 80C51 T0, T1, and T2)
* Eight 16-bit CPU registers each capable of performing all
arithmetic and logic operations as well as acting as memory pointers. Operations may also be performed directly to memory.
* Both 8-bit and 16-bit CPU registers, each capable of performing
all arithmetic and logic operations.
* An enhanced instruction set that includes bit intensive logic
* Watchdog timer * Two enhanced UARTs * Four 8-bit I/O ports with 4 programmable output configurations * 44-pin PLCC and 44-pin LQFP packages
operations and fast signed or unsigned 16 x 16 multiply and 32 / 16 divide
ORDERING INFORMATION
Package Type number PXAG37KBBD PXAG37KBA PXAG37KFBD PXAG37KFA OTP1 OTP1 Name LQFP44 LQFP44 Description plastic low profile quad flat package; 44 leads; body 10 x 10 x 1.4 mm plastic leaded chip carrier; 44 leads plastic low profile quad flat package; 44 leads; body 10 x 10 x 1.4 mm plastic leaded chip carrier; 44 leads Temperature Range (C) 0 to +70 0 to +70 -40 to +85 -40 to +85 Version SOT389-1 SOT187-2 SOT389-1 SOT187-2
OTP1 PLCC44 OTP1 PLCC44
NOTE: 1. OTP = One Time Programmable EPROM.
2002 Mar 25
1
853-2325 27917
Philips Semiconductors
Product data
XA 16-bit microcontroller family
32K OTP, 512 B RAM, watchdog, 2 UARTs
XA-G37
PIN CONFIGURATIONS 44-Pin PLCC Package
6 1 40
44-Pin LQFP Package
44 34
7
39 1 PLCC 33
LQFP
17
29
11
23
18 Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 Function VSS P1.0/A0/WRH P1.1/A1 P1.2/A2 P1.3/A3 P1.4/RxD1 P1.5/TxD1 P1.6/T2 P1.7/T2EX RST P3.0/RxD0 NC P3.1/TxD0 P3.2/INT0 P3.3/INT1 P3.4/T0 P3.5/T1/BUSW P3.6/WRL P3.7/RD XTAL2 XTAL1 VSS Pin 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44
28 Function VDD P2.0/A12D8 P2.1/A13D9 P2.2/A14D10 P2.3/A15D11 P2.4/A16D12 P2.5/A17D13 P2.6/A18D14 P2.7/A19D15 PSEN ALE/PROG NC EA/VPP/WAIT P0.7/A11D7 P0.6/A10D6 P0.5/A9D5 P0.4/A8D4 P0.3/A7D3 P0.2/A6D2 P0.1/A5D1 P0.0/A4D0 VDD SU00525 12 Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 Function P1.5/TxD1 P1.6/T2 P1.7/T2EX RST P3.0/RxD0 NC P3.1/TxD0 P3.2/INT0 P3.3/INT1 P3.4/T0 P3.5/T1/BUSW P3.6/WRL P3.7/RD XTAL2 XTAL1 VSS VDD P2.0/A12D8 P2.1/A13D9 P2.2/A14D10 P2.3/A15D11 P2.4/A16/D12 Pin 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 22 Function P2.5/A17D13 P2.6/A18D14 P2.7/A19D15 PSEN ALE/PROG NC EA/VPP/WAIT P0.7/A11D7 P0.6/A10D6 P0.5/A9D5 P0.4/A8D4 P0.3/A7D3 P0.2/A6D2 P0.1/A5D1 P0.0/A4D0 VDD VSS P1.0/A0/WRH P1.1/A1 P1.2/A2 P1.3/A3 P1.4/RxD1 SU00580
LOGIC SYMBOL
VDD VSS
XTAL1 T2EX* T2* TXD1 RXD1 A3 A2 A1 A0/WRH ADDRESS BUS
XTAL2
RST EA/WAIT PSEN ADDRESS AND DATA BUS ALE PORT 2 PORT 0
ALTERNATE FUNCTIONS
RxD0 TxD0 INT0 INT1 T0 T1/BUSW WRL RD
*
NOT AVAILABLE ON 40-PIN DIP PACKAGE
PORT 3
PORT 1
SU00526
2002 Mar 25
2
Philips Semiconductors
Product data
XA 16-bit microcontroller family
32K OTP, 512 B RAM, watchdog, 2 UARTs
XA-G37
BLOCK DIAGRAM
XA CPU Core
Program Memory Bus 32 KBYTES EPROM
SFR BUS
UART0 512 BYTES STATIC RAM Data Bus
UART1 PORT 0
TIMER 0 & TIMER 1 PORT 1
TIMER 2 PORT 2
WATCHDOG TIMER PORT 3
SU01632
2002 Mar 25
3
Philips Semiconductors
Product data
XA 16-bit microcontroller family
32K OTP, 512 B RAM, watchdog, 2 UARTs
XA-G37
PIN DESCRIPTIONS
PIN. NO. MNEMONIC PLCC VSS VDD P0.0 - P0.7 1, 22 23, 44 43-36 LQFP 16 17 37-30 I I I/O Ground: 0 V reference. Power Supply: This is the power supply voltage for normal, idle, and power down operation. Port 0: Port 0 is an 8-bit I/O port with a user-configurable output type. Port 0 latches have 1s written to them and are configured in the quasi-bidirectional mode during reset. The operation of port 0 pins as inputs and outputs depends upon the port configuration selected. Each port pin is configured independently. Refer to the section on I/O port configuration and the DC Electrical Characteristics for details. When the external program/data bus is used, Port 0 becomes the multiplexed low data/instruction byte and address lines 4 through 11. P1.0 - P1.7 2-9 40-44, 1-3 I/O Port 1: Port 1 is an 8-bit I/O port with a user-configurable output type. Port 1 latches have 1s written to them and are configured in the quasi-bidirectional mode during reset. The operation of port 1 pins as inputs and outputs depends upon the port configuration selected. Each port pin is configured independently. Refer to the section on I/O port configuration and the DC Electrical Characteristics for details. Port 1 also provides special functions as described below. A0/WRH: Address bit 0 of the external address bus when the external data bus is configured for an 8 bit width. When the external data bus is configured for a 16 bit width, this pin becomes the high byte write strobe. A1: Address bit 1 of the external address bus. A2: Address bit 2 of the external address bus. A3: Address bit 3 of the external address bus. RxD1 (P1.4): Receiver input for serial port 1. TxD1 (P1.5): Transmitter output for serial port 1. T2 (P1.6): Timer/counter 2 external count input/clockout. T2EX (P1.7): Timer/counter 2 reload/capture/direction control Port 2: Port 2 is an 8-bit I/O port with a user-configurable output type. Port 2 latches have 1s written to them and are configured in the quasi-bidirectional mode during reset. The operation of port 2 pins as inputs and outputs depends upon the port configuration selected. Each port pin is configured independently. Refer to the section on I/O port configuration and the DC Electrical Characteristics for details. When the external program/data bus is used in 16-bit mode, Port 2 becomes the multiplexed high data/instruction byte and address lines 12 through 19. When the external program/data bus is used in 8-bit mode, the number of address lines that appear on port 2 is user programmable. P3.0 - P3.7 11, 13-19 5, 7-13 I/O Port 3: Port 3 is an 8-bit I/O port with a user configurable output type. Port 3 latches have 1s written to them and are configured in the quasi-bidirectional mode during reset. the operation of port 3 pins as inputs and outputs depends upon the port configuration selected. Each port pin is configured independently. Refer to the section on I/O port configuration and the DC Electrical Characteristics for details. Port 3 also provides various special functions as described below. RxD0 (P3.0): Receiver input for serial port 0. TxD0 (P3.1): Transmitter output for serial port 0. INT0 (P3.2): External interrupt 0 input. INT1 (P3.3): External interrupt 1 input. T0 (P3.4): Timer 0 external input, or timer 0 overflow output. T1/BUSW (P3.5): Timer 1 external input, or timer 1 overflow output. The value on this pin is latched as the external reset input is released and defines the default external data bus width (BUSW). 0 = 8-bit bus and 1 = 16-bit bus. WRL (P3.6): External data memory low byte write strobe. RD (P3.7): External data memory read strobe. Reset: A low on this pin resets the microcontroller, causing I/O ports and peripherals to take on their default states, and the processor to begin execution at the address contained in the reset vector. Refer to the section on Reset for details. Address Latch Enable/Program Pulse: A high output on the ALE pin signals external circuitry to latch the address portion of the multiplexed address/data bus. A pulse on ALE occurs only when it is needed in order to process a bus cycle. TYPE NAME AND FUNCTION
2
40
O
3 4 5 6 7 8 9 P2.0 - P2.7 24-31
41 42 43 44 1 2 3 18-25
O O O I O I/O I I/O
11 13 14 15 16 17
5 7 8 9 10 11
I O I I I/O I/O
18 19 RST 10
12 13 4
O O I
ALE/PROG
33
27
I/O
2002 Mar 25
4
Philips Semiconductors
Product data
XA 16-bit microcontroller family
32K OTP, 512 B RAM, watchdog, 2 UARTs
XA-G37
PIN. NO. MNEMONIC PLCC PSEN 32 LQFP 26 O Program Store Enable: The read strobe for external program memory. When the microcontroller accesses external program memory, PSEN is driven low in order to enable memory devices. PSEN is only active when external code accesses are performed. External Access/Wait: The EA input determines whether the internal program memory of the microcontroller is used for code execution. The value on the EA pin is latched as the external reset input is released and applies during later execution. When latched as a 0, external program memory is used exclusively, when latched as a 1, internal program memory will be used up to its limit, and external program memory used above that point. After reset is released, this pin takes on the function of bus Wait input. If Wait is asserted high during any external bus access, that cycle will be extended until Wait is released. During EPROM programming, this pin is also the programming supply voltage input. Crystal 1: Input to the inverting amplifier used in the oscillator circuit and input to the internal clock generator circuits. Crystal 2: Output from the oscillator amplifier. TYPE NAME AND FUNCTION
EA/WAIT/ VPP
35
29
I
XTAL1 XTAL2
21 20
15 14
I O
SPECIAL FUNCTION REGISTERS
NAME DESCRIPTION SFR ADDRESS BIT FUNCTIONS AND ADDRESSES MSB -- DW1 WM1 -- DW0 WM0 -- DWA1 ALEW WAITD DWA0 -- BUSD DR1 CR1 BC2 DR0 CR0 BC1 DRA1 CRA1 LSB BC0 DRA0 CRA0 RESET VALUE
BCR BTRH BTRL CS DS ES IEH*
Bus configuration register Bus timing register high byte Bus timing register low byte Code segment Data segment Extra segment Interrupt enable high byte
46A 469 468 443 441 442
Note 1 FF EF 00 00 00
33F 427 -- 337 IEL* IPA0 IPA1 IPA2 IPA4 IPA5 Interrupt enable low byte Interrupt priority 0 Interrupt priority 1 Interrupt priority 2 Interrupt priority 4 Interrupt priority 5 426 4A0 4A1 4A2 4A4 4A5 EA -- -- -- -- -- 387 P0* Port 0 430 AD7 38F P1* Port 1 431 T2EX 397 P2* Port 2 432 P2.7
33E -- 336 --
33D -- 335 -- PT0 PT1 -- PTI0 PTI1
33C -- 334 ET2
33B ETI1 333 ET1 -- -- -- -- --
33A ERI1 332 EX1
339 ETI0 331 ET0 PX0 PX1 PT2 PRI0 PRI1
338 ERI0 330 EX0 00 00 00 00 00 00 380 AD0 388 WRH 390 P2.0 FF FF FF 00
386 AD6 38E T2 396 P2.6
385 AD5 38D TxD1 395 P2.5
384 AD4 38C RxD1 394 P2.4
383 AD3 38B A3 393 P2.3
382 AD2 38A A2 392 P2.2
381 AD1 389 A1 391 P2.1
2002 Mar 25
5
Philips Semiconductors
Product data
XA 16-bit microcontroller family
32K OTP, 512 B RAM, watchdog, 2 UARTs
XA-G37
NAME
DESCRIPTION
SFR ADDRESS
BIT FUNCTIONS AND ADDRESSES MSB 39F 39E WR 39D T1 39C T0 39B INT1 39A INT0 399 TxD0 LSB 398 RxD0
RESET VALUE
P3* P0CFGA P1CFGA P2CFGA P3CFGA P0CFGB P1CFGB P2CFGB P3CFGB
Port 3 Port 0 configuration A Port 1 configuration A Port 2 configuration A Port 3 configuration A Port 0 configuration B Port 1 configuration B Port 2 configuration B Port 3 configuration B
433 470 471 472 473 4F0 4F1 4F2 4F3
RD
FF Note 5 Note 5 Note 5 Note 5 Note 5 Note 5 Note 5 Note 5
227 PCON* Power control register 404 -- 20F PSWH* Program status word (high byte) 401 SM 207 PSWL* Program status word (low byte) 400 C 217 PSW51* RTH0 RTH1 RTL0 RTL1 80C51 compatible PSW Timer 0 extended reload, high byte Timer 1 extended reload, high byte Timer 0 extended reload, low byte Timer 1 extended reload, low byte 402 455 457 454 456 307 S0CON* Serial port 0 control register 420 SM0_0 30F S0STAT* S0BUF S0ADDR S0ADEN Serial port 0 extended status Serial port 0 buffer register Serial port 0 address register Serial port 0 address enable register 421 460 461 462 327 S1CON* Serial port 1 control register 424 SM0_1 32F S1STAT* S1BUF S1ADDR S1ADEN Serial port 1 extended status Serial port 1 buffer register Serial port 1 address register Serial port 1 address enable register System configuration register 425 464 465 466 -- -- C
226 -- 20E TM 206 AC 216 AC
225 -- 20D RS1 205 -- 215 F0
224 -- 20C RS0 204 -- 214 RS1
223 -- 20B IM3 203 -- 213 RS0
222 -- 20A IM2 202 V 212 V
221 PD 209 IM1 201 N 211 F1
220 IDL 208 IM0 200 Z 210 P Note 3 00 00 00 00 Note 2 Note 2 00
306 SM1_0 30E --
305 SM2_0 30D --
304 REN_0 30C --
303 TB8_0 30B FE0
302 RB8_0 30A BR0
301 TI_0 309 OE0
300 RI_0 308
STINT0
00
00 x 00 00
326 SM1_1 32E --
325 SM2_1 32D --
324 REN_1 32C --
323 TB8_1 32B FE1
322 RB8_1 32A BR1
321 TI_1 329 OE1
320 RI_1 328
STINT1
00
00 x 00 00
SCR
440
-- 21F
-- 21E
R6SEG
-- 21D
R5SEG
-- 21C
R4SEG
PT1 21B
R3SEG
PT0 21A
R2SEG
CM 219
R1SEG
PZ 218
R0SEG
00
SSEL* SWE
Segment selection register Software Interrupt Enable
403 47A
ESWEN
00 00
--
SWE7
SWE6
SWE5
SWE4
SWE3
SWE2
SWE1
2002 Mar 25
6
Philips Semiconductors
Product data
XA 16-bit microcontroller family
32K OTP, 512 B RAM, watchdog, 2 UARTs
XA-G37
NAME
DESCRIPTION
SFR ADDRESS
BIT FUNCTIONS AND ADDRESSES MSB 357 356 SWR7 2C6 EXF2 2CE -- 355 SWR6 2C5 RCLK0 2CD RCLK1 354 SWR5 2C4 TCLK0 2CC TCLK1 353 SWR4 2C3
EXEN2
LSB 352 SWR3 2C2 TR2 2CA -- 351 SWR2 2C1 C/T2 2C9 T2OE 350 SWR1 2C0
CP/RL2
RESET VALUE
SWR*
Software Interrupt Request
42A
-- 2C7
00
T2CON*
Timer 2 control register
418
TF2 2CF
00
2CB --
2C8 DCEN 00 00 00 00 00
T2MOD* TH2 TL2 T2CAPH T2CAPL
Timer 2 mode control Timer 2 high byte Timer 2 low byte Timer 2 capture register, high byte Timer 2 capture register, low byte
419 459 458 45B 45A
--
287 TCON* TH0 TH1 TL0 TL1 TMOD Timer 0 and 1 control register Timer 0 high byte Timer 1 high byte Timer 0 low byte Timer 1 low byte Timer 0 and 1 mode control 410 451 453 450 452 45C GATE 28F TSTAT* Timer 0 and 1 extended status 411 -- 2FF
WDCON*
286 TR1
285 TF0
284 TR0
283 IE1
282 IT1
281 IE0
280 IT0 00 00 00 00 00
TF1
C/T 28E -- 2FE PRE1
M1 28D -- 2FD PRE0
M0 28C -- 2FC --
GATE 28B -- 2FB --
C/T 28A T1OE 2FA
WDRUN
M1 289 -- 2F9
WDTOF
M0 288 T0OE 2F8
--
00
00
Watchdog control register Watchdog timer reload Watchdog feed 1 Watchdog feed 2
41F 45F 45D 45E
PRE2
Note 6 00 x x
WDL
WFEED1 WFEED2
NOTES: * SFRs are bit addressable. 1. At reset, the BCR register is loaded with the binary value 0000 0a11, where "a" is the value on the BUSW pin. This defaults the address bus size to 20 bits since the XA-G37 has only 20 address lines. 2. SFR is loaded from the reset vector. 3. All bits except F1, F0, and P are loaded from the reset vector. Those bits are all 0. 4. Unimplemented bits in SFRs are X (unknown) at all times. Ones should not be written to these bits since they may be used for other purposes in future XA derivatives. The reset value shown for these bits is 0. 5. Port configurations default to quasi-bidirectional when the XA begins execution from internal code memory after reset, based on the condition found on the EA pin. Thus all PnCFGA registers will contain FF and PnCFGB registers will contain 00. When the XA begins execution using external code memory, the default configuration for pins that are associated with the external bus will be push-pull. The PnCFGA and PnCFGB register contents will reflect this difference. 6. The WDCON reset value is E6 for a Watchdog reset, E4 for all other reset causes. 7. The XA-G37 implements an 8-bit SFR bus, as stated in Chapter 8 of the XA User Guide. All SFR accesses must be 8-bit operations. Attempts to write 16 bits to an SFR will actually write only the lower 8 bits. Sixteen bit SFR reads will return undefined data in the upper byte.
2002 Mar 25
7
Philips Semiconductors
Product data
XA 16-bit microcontroller family
32K OTP, 512 B RAM, watchdog, 2 UARTs
XA-G37
XA-G37 TIMER/COUNTERS
The XA has two standard 16-bit enhanced Timer/Counters: Timer 0 and Timer 1. Additionally, it has a third 16-bit Up/Down timer/counter, T2. A central timing generator in the XA core provides the time-base for all XA Timers and Counters. The timer/event counters can perform the following functions: - Measure time intervals and pulse duration - Count external events - Generate interrupt requests - Generate PWM or timed output waveforms All of the timer/counters (Timer 0, Timer 1 and Timer 2) can be independently programmed to operate either as timers or event counters via the C/T bit in the TnCON register. All timers count up unless otherwise stated. These timers may be dynamically read during program execution. The base clock rate of all of the timers is user programmable. This applies to timers T0, T1, and T2 when running in timer mode (as opposed to counter mode), and the watchdog timer. The clock driving the timers is called TCLK and is determined by the setting of two bits (PT1, PT0) in the System Configuration Register (SCR). The frequency of TCLK may be selected to be the oscillator input divided by 4 (Osc/4), the oscillator input divided by 16 (Osc/16), or the oscillator input divided by 64 (Osc/64). This gives a range of possibilities for the XA timer functions, including baud rate
generation, Timer 2 capture. Note that this single rate setting applies to all of the timers. When timers T0, T1, or T2 are used in the counter mode, the register will increment whenever a falling edge (high to low transition) is detected on the external input pin corresponding to the timer clock. These inputs are sampled once every 2 oscillator cycles, so it can take as many as 4 oscillator cycles to detect a transition. Thus the maximum count rate that can be supported is Osc/4. The duty cycle of the timer clock inputs is not important, but any high or low state on the timer clock input pins must be present for 2 oscillator cycles before it is guaranteed to be "seen" by the timer logic.
Timer 0 and Timer 1
The "Timer" or "Counter" function is selected by control bits C/T in the special function register TMOD. These two Timer/Counters have four operating modes, which are selected by bit-pairs (M1, M0) in the TMOD register. Timer modes 1, 2, and 3 in XA are kept identical to the 80C51 timer modes for code compatibility. Only the mode 0 is replaced in the XA by a more powerful 16-bit auto-reload mode. This will give the XA timers a much larger range when used as time bases. The recommended M1, M0 settings for the different modes are shown in Figure 2.
SCR Address:440 Not Bit Addressable Reset Value: 00H PT1 0 0 1 1 CM PT0 0 1 0 1
MSB -- -- -- -- PT1 PT0 CM
LSB PZ
PZ
OPERATING Prescaler selection. Osc/4 Osc/16 Osc/64 Reserved Compatibility Mode allows the XA to execute most translated 80C51 code on the XA. The XA register file must copy the 80C51 mapping to data memory and mimic the 80C51 indirect addressing scheme. Page Zero mode forces all program and data addresses to 16-bits only. This saves stack space and speeds up execution but limits memory access to 64k.
SU00589
Figure 1. System Configuration Register (SCR)
TMOD Address:45C Not Bit Addressable Reset Value: 00H
MSB GATE C/T M1 M0 GATE C/T M1
LSB M0
TIMER 1 GATE C/T M1 0 0 1 1 M0 0 1 0 1
TIMER 0
Gating control when set. Timer/Counter "n" is enabled only while "INTn" pin is high and "TRn" control bit is set. When cleared Timer "n" is enabled whenever "TRn" control bit is set. Timer or Counter Selector cleared for Timer operation (input from internal system clock.) Set for Counter operation (input from "Tn" input pin). OPERATING 16-bit auto-reload timer/counter 16-bit non-auto-reload timer/counter 8-bit auto-reload timer/counter Dual 8-bit timer mode (timer 0 only) Figure 2. Timer/Counter Mode Control (TMOD) Register
SU00605
2002 Mar 25
8
Philips Semiconductors
Product data
XA 16-bit microcontroller family
32K OTP, 512 B RAM, watchdog, 2 UARTs
XA-G37
New Enhanced Mode 0
For timers T0 or T1 the 13-bit count mode on the 80C51 (current Mode 0) has been replaced in the XA with a 16-bit auto-reload mode. Four additional 8-bit data registers (two per timer: RTHn and RTLn) are created to hold the auto-reload values. In this mode, the TH overflow will set the TF flag in the TCON register and cause both the TL and TH counters to be loaded from the RTL and RTH registers respectively. These new SFRs will also be used to hold the TL reload data in the 8-bit auto-reload mode (Mode 2) instead of TH. The overflow rate for Timer 0 or Timer 1 in Mode 0 may be calculated as follows: Timer_Rate = Osc / (N * (65536 - Timer_Reload_Value)) where N = the TCLK prescaler value: 4 (default), 16, or 64.
Mode 2 operation is the same for Timer/Counter 0. The overflow rate for Timer 0 or Timer 1 in Mode 2 may be calculated as follows: Timer_Rate = Osc / (N * (256 - Timer_Reload_Value)) where N = the TCLK prescaler value: 4, 16, or 64.
Mode 3
Timer 1 in Mode 3 simply holds its count. The effect is the same as setting TR1 = 0. Timer 0 in Mode 3 establishes TL0 and TH0 as two separate counters. TL0 uses the Timer 0 control bits: C/T, GATE, TR0, INT0, and TF0. TH0 is locked into a timer function and takes over the use of TR1 and TF1 from Timer 1. Thus, TH0 now controls the "Timer 1" interrupt. Mode 3 is provided for applications requiring an extra 8-bit timer. When Timer 0 is in Mode 3, Timer 1 can be turned on and off by switching it out of and into its own Mode 3, or can still be used by the serial port as a baud rate generator, or in fact, in any application not requiring an interrupt.
Mode 1
Mode 1 is the 16-bit non-auto reload mode.
Mode 2
Mode 2 configures the Timer register as an 8-bit Counter (TLn) with automatic reload. Overflow from TLn not only sets TFn, but also reloads TLn with the contents of RTLn, which is preset by software. The reload leaves THn unchanged.
TCON Address:410 Bit Addressable Reset Value: 00H BIT TCON.7 SYMBOL TF1
MSB TF1 TR1 TF0 TR0 IE1 IT1 IE0
LSB IT0
TCON.6 TCON.5
TR1 TF0
TCON.4 TCON.3 TCON.2 TCON.1 TCON.0
TR0 IE1 IT1 IE0 IT0
FUNCTION Timer 1 overflow flag. Set by hardware on Timer/Counter overflow. This flag will not be set if T1OE (TSTAT.2) is set. Cleared by hardware when processor vectors to interrupt routine, or by clearing the bit in software. Timer 1 Run control bit. Set/cleared by software to turn Timer/Counter 1 on/off. Timer 0 overflow flag. Set by hardware on Timer/Counter overflow. This flag will not be set if T0OE (TSTAT.0) is set. Cleared by hardware when processor vectors to interrupt routine, or by clearing the bit in software. Timer 0 Run control bit. Set/cleared by software to turn Timer/Counter 0 on/off. Interrupt 1 Edge flag. Set by hardware when external interrupt edge detected. Cleared when interrupt processed. Interrupt 1 type control bit. Set/cleared by software to specify falling edge/low level triggered external interrupts. Interrupt 0 Edge flag. Set by hardware when external interrupt edge detected. Cleared when interrupt processed. Interrupt 0 Type control bit. Set/cleared by software to specify falling edge/low level triggered external interrupts.
SU00604C
Figure 3. Timer/Counter Control (TCON) Register
2002 Mar 25
9
Philips Semiconductors
Product data
XA 16-bit microcontroller family
32K OTP, 512 B RAM, watchdog, 2 UARTs
XA-G37
T2CON Address:418 Bit Addressable Reset Value: 00H BIT T2CON.7 T2CON.6
MSB TF2 EXF2 RCLK0 TCLK0 EXEN2 TR2 C2 or T2
LSB CP or RL2
T2CON.5 T2CON.4 T2CON.3 T2CON.2 T2CON.1
T2CON.0
SYMBOL FUNCTION TF2 Timer 2 overflow flag. Set by hardware on Timer/Counter overflow. Must be cleared by software. TF2 will not be set when RCLK0, RCLK1, TCLK0, TCLK1 or T2OE=1. EXF2 Timer 2 external flag is set when a capture or reload occurs due to a negative transition on T2EX (and EXEN2 is set). This flag will cause a Timer 2 interrupt when this interrupt is enabled. EXF2 is cleared by software. RCLK0 Receive Clock Flag. TCLK0 Transmit Clock Flag. RCLK0 and TCLK0 are used to select Timer 2 overflow rate as a clock source for UART0 instead of Timer T1. EXEN2 Timer 2 external enable bit allows a capture or reload to occur due to a negative transition on T2EX. TR2 Start=1/Stop=0 control for Timer 2. C2 or T2 Timer or counter select. 0=Internal timer 1=External event counter (falling edge triggered) CP or RL2 Capture/Reload flag. If CP/RL2 & EXEN2=1 captures will occur on negative transitions of T2EX. If CP/RL2=0, EXEN2=1 auto reloads occur with either Timer 2 overflows or negative transitions at T2EX. If RCLK or TCLK=1 the timer is set to auto reload on Timer 2 overflow, this bit has no effect.
SU00606
Figure 4. Timer/Counter 2 Control (T2CON) Register
New Timer-Overflow Toggle Output
In the XA, the timer module now has two outputs, which toggle on overflow from the individual timers. The same device pins that are used for the T0 and T1 count inputs are also used for the new overflow outputs. An SFR bit (TnOE in the TSTAT register) is associated with each counter and indicates whether Port-SFR data or the overflow signal is output to the pin. These outputs could be used in applications for generating variable duty cycle PWM outputs (changing the auto-reload register values). Also variable frequency (Osc/8 to Osc/8,388,608) outputs could be achieved by adjusting the prescaler along with the auto-reload register values. With a 30.0MHz oscillator, this range would be 3.58Hz to 3.75MHz.
Auto-Reload Mode (Up or Down Counter) In the auto-reload mode, the timer registers are loaded with the 16-bit value in T2CAPH and T2CAPL when the count overflows. T2CAPH and T2CAPL are initialized by software. If the EXEN2 bit in T2CON is set, the timer registers will also be reloaded and the EXF2 flag set when a 1-to-0 transition occurs at input T2EX. The auto-reload mode is shown in Figure 8. In this mode, Timer 2 can be configured to count up or down. This is done by setting or clearing the bit DCEN (Down Counter Enable) in the T2MOD special function register (see Table 1). The T2EX pin then controls the count direction. When T2EX is high, the count is in the up direction, when T2EX is low, the count is in the down direction. Figure 8 shows Timer 2, which will count up automatically, since DCEN = 0. In this mode there are two options selected by bit EXEN2 in the T2CON register. If EXEN2 = 0, then Timer 2 counts up to FFFFH and sets the TF2 (Overflow Flag) bit upon overflow. This causes the Timer 2 registers to be reloaded with the 16-bit value in T2CAPL and T2CAPH, whose values are preset by software. If EXEN2 = 1, a 16-bit reload can be triggered either by an overflow or by a 1-to-0 transition at input T2EX. This transition also sets the EXF2 bit. If enabled, either TF2 or EXF2 bit can generate the Timer 2 interrupt. In Figure 9, the DCEN = 1; this enables the Timer 2 to count up or down. In this mode, the logic level of T2EX pin controls the direction of count. When a logic `1' is applied at pin T2EX, the Timer 2 will count up. The Timer 2 will overflow at FFFFH and set the TF2 flag, which can then generate an interrupt if enabled. This timer overflow, also causes the 16-bit value in T2CAPL and T2CAPH to be reloaded into the timer registers TL2 and TH2, respectively. A logic `0' at pin T2EX causes Timer 2 to count down. When counting down, the timer value is compared to the 16-bit value contained in T2CAPH and T2CAPL. When the value is equal, the
Timer T2
Timer 2 in the XA is a 16-bit Timer/Counter which can operate as either a timer or as an event counter. This is selected by C/T2 in the special function register T2CON. Upon timer T2 overflow/underflow, the TF2 flag is set, which may be used to generate an interrupt. It can be operated in one of three operating modes: auto-reload (up or down counting), capture, or as the baud rate generator (for either or both UARTs via SFRs T2MOD and T2CON). These modes are shown in Table 1. Capture Mode In the capture mode there are two options which are selected by bit EXEN2 in T2CON. If EXEN2 = 0, then timer 2 is a 16-bit timer or counter, which upon overflowing sets bit TF2, the timer 2 overflow bit. This will cause an interrupt when the timer 2 interrupt is enabled. If EXEN2 = 1, then Timer 2 still does the above, but with the added feature that a 1-to-0 transition at external input T2EX causes the current value in the Timer 2 registers, TL2 and TH2, to be captured into registers RCAP2L and RCAP2H, respectively. In addition, the transition at T2EX causes bit EXF2 in T2CON to be set. This will cause an interrupt in the same fashion as TF2 when the Timer 2 interrupt is enabled. The capture mode is illustrated in Figure 7.
2002 Mar 25
10
Philips Semiconductors
Product data
XA 16-bit microcontroller family
32K OTP, 512 B RAM, watchdog, 2 UARTs
XA-G37
timer register is loaded with FFFF hex. The underflow also sets the TF2 flag, which can generate an interrupt if enabled. The external flag EXF2 toggles when Timer 2 underflows or overflows. This EXF2 bit can be used as a 17th bit of resolution, if needed. the EXF2 flag does not generate an interrupt in this mode. As the baud rate generator, timer T2 is incremented by TCLK. Baud Rate Generator Mode By setting the TCLKn and/or RCLKn in T2CON or T2MOD, the Timer 2 can be chosen as the baud rate generator for either or both UARTs. The baud rates for transmit and receive can be simultaneously different.
Timer/Counter 2 or (2) to output a 50% duty cycle clock ranging from 3.58Hz to 3.75MHz at a 30MHz operating frequency. To configure the Timer/Counter 2 as a clock generator, bit C/T2 (in T2CON) must be cleared and bit T20E in T2MOD must be set. Bit TR2 (T2CON.2) also must be set to start the timer. The Clock-Out frequency depends on the oscillator frequency and the reload value of Timer 2 capture registers (TCAP2H, TCAP2L) as shown in this equation: 2 TCLK (65536 * TCAP2H, TCAP2L)
Programmable Clock-Out
A 50% duty cycle clock can be programmed to come out on P1.6. This pin, besides being a regular I/O pin, has two alternate functions. It can be programmed (1) to input the external clock for
In the Clock-Out mode Timer 2 roll-overs will not generate an interrupt. This is similar to when it is used as a baud-rate generator. It is possible to use Timer 2 as a baud-rate generator and a clock generator simultaneously. Note, however, that the baud-rate will be 1/8 of the Clock-Out frequency.
Table 1. Timer 2 Operating Modes
TR2 0 1 1 1 1 CP/RL2 X 0 0 1 X RCLK+TCLK X 0 0 0 1 DCEN X 0 1 X X MODE Timer off (stopped) 16-bit auto-reload, counting up 16-bit auto-reload, counting up or down depending on T2EX pin 16-bit capture Baud rate generator
TSTAT Address:411 Bit Addressable Reset Value: 00H BIT TSTAT.2 TSTAT.0 SYMBOL T1OE T0OE
MSB -- -- -- -- -- T1OE --
LSB T0OE
FUNCTION When 0, this bit allows the T1 pin to clock Timer 1 when in the counter mode. When 1, T1 acts as an output and toggles at every Timer 1 overflow. When 0, this bit allows the T0 pin to clock Timer 0 when in the counter mode. When 1, T0 acts as an output and toggles at every Timer 0 overflow.
SU00612B
Figure 5. Timer 0 And 1 Extended Status (TSTAT)
T2MOD Address:419 Bit Addressable Reset Value: 00H
MSB -- -- RCLK1 TCLK1 -- -- T2OE
LSB DCEN
BIT SYMBOL FUNCTION T2MOD.5 RCLK1 Receive Clock Flag. T2MOD.4 TCLK1 Transmit Clock Flag. RCLK1 and TCLK1 are used to select Timer 2 overflow rate as a clock source for UART1 instead of Timer T1. T2MOD.1 T2OE When 0, this bit allows the T2 pin to clock Timer 2 when in the counter mode. When 1, T2 acts as an output and toggles at every Timer 2 overflow. T2MOD.0 DCEN Controls count direction for Timer 2 in autoreload mode. DCEN=0 counter set to count up only DCEN=1 counter set to count up or down, depending on T2EX (see text). Figure 6. Timer 2 Mode Control (T2MOD)
SU00610B
2002 Mar 25
11
Philips Semiconductors
Product data
XA 16-bit microcontroller family
32K OTP, 512 B RAM, watchdog, 2 UARTs
XA-G37
TCLK
C/T2 = 0 TL2 (8-bits) TH2 (8-bits) TF2
T2 Pin
C/T2 = 1 Control
Transition Detector
TR2
Capture Timer 2 Interrupt T2CAPL T2CAPH
T2EX Pin
EXF2
Control EXEN2
SU00704
Figure 7. Timer 2 in Capture Mode
TCLK
C/T2 = 0 TL2 (8-bits) TH2 (8-bits)
T2 Pin
C/T2 = 1 Control TR2 Reload Transition Detector T2CAPL T2CAPH TF2 Timer 2 Interrupt
T2EX Pin
EXF2
Control EXEN2
SU00705
Figure 8. Timer 2 in Auto-Reload Mode (DCEN = 0)
(DOWN COUNTING RELOAD VALUE) FFH FFH
TOGGLE EXF2
TCLK
C/T2 = 0 OVERFLOW TL2 TH2 TF2 INTERRUPT
T2 PIN
C/T2 = 1 CONTROL TR2 COUNT DIRECTION 1 = UP 0 = DOWN T2CAPL T2CAPH T2EX PIN
(UP COUNTING RELOAD VALUE)
SU00706
Figure 9. Timer 2 Auto Reload Mode (DCEN = 1) 2002 Mar 25 12
Philips Semiconductors
Product data
XA 16-bit microcontroller family
32K OTP, 512 B RAM, watchdog, 2 UARTs
XA-G37
WATCHDOG TIMER
The watchdog timer subsystem protects the system from incorrect code execution by causing a system reset when the watchdog timer underflows as a result of a failure of software to feed the timer prior to the timer reaching its terminal count. It is important to note that the watchdog timer is running after any type of reset and must be turned off by user software if the application does not use the watchdog function.
The software must be written so that a feed operation takes place every tD seconds from the last feed operation. Some tradeoffs may need to be made. It is not advisable to include feed operations in minor loops or in subroutines unless the feed operation is a specific subroutine. To turn the watchdog timer completely off, the following code sequence should be used: mov.b mov.b mov.b wdcon,#0 ; set WD control register to clear WDRUN. wfeed1,#A5h ; do watchdog feed part 1 wfeed2,#5Ah ; do watchdog feed part 2
Watchdog Function
The watchdog consists of a programmable prescaler and the main timer. The prescaler derives its clock from the TCLK source that also drives timers 0, 1, and 2. The watchdog timer subsystem consists of a programmable 13-bit prescaler, and an 8-bit main timer. The main timer is clocked (decremented) by a tap taken from one of the top 8-bits of the prescaler as shown in Figure 10. The clock source for the prescaler is the same as TCLK (same as the clock source for the timers). Thus the main counter can be clocked as often as once every 32 TCLKs (see Table 2). The watchdog generates an underflow signal (and is autoloaded from WDL) when the watchdog is at count 0 and the clock to decrement the watchdog occurs. The watchdog is 8 bits wide and the autoload value can range from 0 to FFH. (The autoload value of 0 is permissible since the prescaler is cleared upon autoload). This leads to the following user design equations. Definitions: tOSC is the oscillator period, N is the selected prescaler tap value, W is the main counter autoload value, P is the prescaler value from Table 2, tMIN is the minimum watchdog time-out value (when the autoload value is 0), tMAX is the maximum time-out value (when the autoload value is FFH), tD is the design time-out value. tMIN = tOSC x 4 x 32 (W = 0, N = 4) tMAX = tOSC x 64 x 4096 x 256 (W = 255, N = 64) tD = tOSC x N x P x (W + 1) The watchdog timer is not directly loadable by the user. Instead, the value to be loaded into the main timer is held in an autoload register. In order to cause the main timer to be loaded with the appropriate value, a special sequence of software action must take place. This operation is referred to as feeding the watchdog timer. To feed the watchdog, two instructions must be sequentially executed successfully. No intervening SFR accesses are allowed, so interrupts should be disabled before feeding the watchdog. The instructions should move A5H to the WFEED1 register and then 5AH to the WFEED2 register. If WFEED1 is correctly loaded and WFEED2 is not correctly loaded, then an immediate watchdog reset will occur. The program sequence to feed the watchdog timer or cause new WDCON settings to take effect is as follows: clr mov.b mov.b setb ea wfeed1,#A5h wfeed2,#5Ah ea ; disable global interrupts. ; do watchdog feed part 1 ; do watchdog feed part 2 ; re-enable global interrupts.
This sequence assumes that the watchdog timer is being turned off at the beginning of initialization code and that the XA interrupt system has not yet been enabled. If the watchdog timer is to be turned off at a point when interrupts may be enabled, instructions to disable and re-enable interrupts should be added to this sequence.
Watchdog Control Register (WDCON)
The reset values of the WDCON and WDL registers will be such that the watchdog timer has a timeout period of 4 x 4096 x tOSC and the watchdog is running. WDCON can be written by software but the changes only take effect after executing a valid watchdog feed sequence.
Table 2. Prescaler Select Values in WDCON
PRE2 0 0 0 0 1 1 1 1 PRE1 0 0 1 1 0 0 1 1 PRE0 0 1 0 1 0 1 0 1 DIVISOR 32 64 128 256 512 1024 2048 4096
Watchdog Detailed Operation
When external RESET is applied, the following takes place:
* Watchdog run control bit set to ON (1). * Autoload register WDL set to 00 (min. count). * Watchdog time-out flag cleared. * Prescaler is cleared. * Prescaler tap set to the highest divide. * Autoload takes place.
This sequence assumes that the XA interrupt system is enabled and there is a possibility of an interrupt request occurring during the feed sequence. If an interrupt was allowed to be serviced and the service routine contained any SFR access, it would trigger a watchdog reset. If it is known that no interrupt could occur during the feed sequence, the instructions to disable and re-enable interrupts may be removed.
When coming out of a hardware reset, the software should load the autoload register and then feed the watchdog (cause an autoload). If the watchdog is running and happens to underflow at the time the external RESET is applied, the watchdog time-out flag will be cleared.
2002 Mar 25
13
Philips Semiconductors
Product data
XA 16-bit microcontroller family
32K OTP, 512 B RAM, watchdog, 2 UARTs
XA-G37
WDL WATCHDOG FEED SEQUENCE MOV WFEED1,#A5H MOV WFEED2,#5AH
TCLK
PRESCALER
8-BIT DOWN COUNTER
INTERNAL RESET
PRE2
PRE1
PRE0
--
--
WDRUN
WDTOF
--
WDCON
SU00581A
Figure 10. Watchdog Timer in XA-G37 When the watchdog underflows, the following action takes place (see Figure 10): Each UART baud rate is determined by either a fixed division of the oscillator (in UART modes 0 and 2) or by the timer 1 or timer 2 overflow rate (in UART modes 1 and 3). Timer 1 defaults to clock both UART0 and UART1. Timer 2 can be programmed to clock either UART0 through T2CON (via bits R0CLK and T0CLK) or UART1 through T2MOD (via bits R1CLK and T1CLK). In this case, the UART not clocked by T2 could use T1 as the clock source. The serial port receive and transmit registers are both accessed at Special Function Register SnBUF. Writing to SnBUF loads the transmit register, and reading SnBUF accesses a physically separate receive register. The serial port can operate in 4 modes: Mode 0: Serial I/O expansion mode. Serial data enters and exits through RxDn. TxDn outputs the shift clock. 8 bits are transmitted/received (LSB first). (The baud rate is fixed at 1/16 the oscillator frequency.) Mode 1: Standard 8-bit UART mode. 10 bits are transmitted (through TxDn) or received (through RxDn): a start bit (0), 8 data bits (LSB first), and a stop bit (1). On receive, the stop bit goes into RB8 in Special Function Register SnCON. The baud rate is variable. Mode 2: Fixed rate 9-bit UART mode. 11 bits are transmitted (through TxD) or received (through RxD): start bit (0), 8 data bits (LSB first), a programmable 9th data bit, and a stop bit (1). On Transmit, the 9th data bit (TB8_n in SnCON) can be assigned the value of 0 or 1. Or, for example, the parity bit (P, in the PSW) could be moved into TB8_n. On receive, the 9th data bit goes into RB8_n in Special Function Register SnCON, while the stop bit is ignored. The baud rate is programmable to 1/32 of the oscillator frequency. Mode 3: Standard 9-bit UART mode. 11 bits are transmitted (through TxDn) or received (through RxDn): a start bit (0), 8 data bits (LSB first), a programmable 9th data bit, and a stop bit (1). In fact, Mode 3 is the same as Mode 2 in all respects except baud rate. The baud rate in Mode 3 is variable. In all four modes, transmission is initiated by any instruction that uses SnBUF as a destination register. Reception is initiated in Mode 0 by the condition RI_n = 0 and REN_n = 1. Reception is initiated in the other modes by the incoming start bit if REN_n = 1.
* Autoload takes place. * Watchdog time-out flag is set * Watchdog run bit unchanged. * Autoload (WDL) register unchanged. * Prescaler tap unchanged. * All other device action same as external reset.
Note that if the watchdog underflows, the program counter will be loaded from the reset vector as in the case of an internal reset. The watchdog time-out flag can be examined to determine if the watchdog has caused the reset condition. The watchdog time-out flag bit can be cleared by software. WDCON Register Bit Definitions WDCON.7 PRE2 Prescaler Select 2, reset to 1 WDCON.6 PRE1 Prescaler Select 1, reset to 1 WDCON.5 PRE0 Prescaler Select 0, reset to 1 WDCON.4 -- WDCON.3 -- WDCON.2 WDRUN Watchdog Run Control bit, reset to 1 WDCON.1 WDTOF Timeout flag WDCON.0 --
UARTs
The XA-G37 includes 2 UART ports that are compatible with the enhanced UART used on the 8xC51FB. Baud rate selection is somewhat different due to the clocking scheme used for the XA timers. Some other enhancements have been made to UART operation. The first is that there are separate interrupt vectors for each UART's transmit and receive functions. The UART transmitter has been double buffered, allowing packed transmission of data with no gaps between bytes and less critical interrupt service routine timing. A break detect function has been added to the UART. This operates independently of the UART itself and provides a start-of-break status bit that the program may test. Finally, an Overrun Error flag has been added to detect missed characters in the received data stream. The double buffered UART transmitter may require some software changes in code written for the original XA-G37 single buffered UART. 14
2002 Mar 25
Philips Semiconductors
Product data
XA 16-bit microcontroller family
32K OTP, 512 B RAM, watchdog, 2 UARTs
XA-G37
Serial Port Control Register The serial port control and status register is the Special Function Register SnCON, shown in Figure 12. This register contains not only the mode selection bits, but also the 9th data bit for transmit and receive (TB8_n and RB8_n), and the serial port interrupt bits (TI_n and RI_n). TI Flag In order to allow easy use of the double buffered UART transmitter feature, the TI_n flag is set by the UART hardware under two conditions. The first condition is the completion of any byte transmission. This occurs at the end of the stop bit in modes 1, 2, or 3, or at the end of the eighth data bit in mode 0. The second condition is when SnBUF is written while the UART transmitter is idle. In this case, the TI_n flag is set in order to indicate that the second UART transmitter buffer is still available. Typically, UART transmitters generate one interrupt per byte transmitted. In the case of the XA UART, one additional interrupt is generated as defined by the stated conditions for setting the TI_n flag. This additional interrupt does not occur if double buffering is bypassed as explained below. Note that if a character oriented approach is used to transmit data through the UART, there could be a second interrupt for each character transmitted, depending on the timing of the writes to SBUF. For this reason, it is generally better to bypass double buffering when the UART transmitter is used in character oriented mode. This is also true if the UART is polled rather than interrupt driven, and when transmission is character oriented rather than message or string oriented. The interrupt occurs at the end of the last byte transmitted when the UART becomes idle. Among other things, this allows a program to determine when a message has been transmitted completely. The interrupt service routine should handle this additional interrupt.
The recommended method of using the double buffering in the application program is to have the interrupt service routine handle a single byte for each interrupt occurrence. In this manner the program essentially does not require any special considerations for double buffering. Unless higher priority interrupts cause delays in the servicing of the UART transmitter interrupt, the double buffering will result in transmitted bytes being tightly packed with no intervening gaps. 9-bit Mode Please note that the ninth data bit (TB8) is not double buffered. Care must be taken to insure that the TB8 bit contains the intended data at the point where it is transmitted. Double buffering of the UART transmitter may be bypassed as a simple means of synchronizing TB8 to the rest of the data stream. Bypassing Double Buffering The UART transmitter may be used as if it is single buffered. The recommended UART transmitter interrupt service routine (ISR) technique to bypass double buffering first clears the TI_n flag upon entry into the ISR, as in standard practice. This clears the interrupt that activated the ISR. Secondly, the TI_n flag is cleared immediately following each write to SnBUF. This clears the interrupt flag that would otherwise direct the program to write to the second transmitter buffer. If there is any possibility that a higher priority interrupt might become active between the write to SnBUF and the clearing of the TI_n flag, the interrupt system may have to be temporarily disabled during that sequence by clearing, then setting the EA bit in the IEL register. Note Regarding Older XA-G37 Devices Older versions of the XA-G30, XA-G37, and XA-G35 emulation bondout devices do not have the double buffering feature enabled. Contact factory for details.
2002 Mar 25
15
Philips Semiconductors
Product data
XA 16-bit microcontroller family
32K OTP, 512 B RAM, watchdog, 2 UARTs
XA-G37
CLOCKING SCHEME/BAUD RATE GENERATION
The XA UARTS clock rates are determined by either a fixed division (modes 0 and 2) of the oscillator clock or by the Timer 1 or Timer 2 overflow rate (modes 1 and 3). The clock for the UARTs in XA runs at 16x the Baud rate. If the timers are used as the source for Baud Clock, since maximum speed of timers/Baud Clock is Osc/4, the maximum baud rate is timer overflow divided by 16 i.e. Osc/64. In Mode 0, it is fixed at Osc/16. In Mode 2, however, the fixed rate is Osc/32. 00 Pre-scaler for all Timers T0,1,2 T0 1 2 controlled by PT1, PT0 bits in SCR 01 10 11 Osc/4 Osc/16 Osc/64 reserved
Using Timer 2 to Generate Baud Rates
Timer T2 is a 16-bit up/down counter in XA. As a baud rate generator, timer 2 is selected as a clock source for either/both UART0 and UART1 transmitters and/or receivers by setting TCLKn and/or RCLKn in T2CON and T2MOD. As the baud rate generator, T2 is incremented as Osc/N where N = 4, 16 or 64 depending on TCLK as programmed in the SCR bits PT1, and PTO. So, if T2 is the source of one UART, the other UART could be clocked by either T1 overflow or fixed clock, and the UARTs could run independently with different baud rates. T2CON 0x418 bit5 RCLK0 bit5 RCLK1 bit4 TCLK0 bit4 TCLK1
T2MOD 0x419
Baud Rate for UART Mode 0: Baud_Rate = Osc/16 Baud Rate calculation for UART Mode 1 and 3: Baud_Rate = Timer_Rate/16 Timer_Rate = Osc/(N*(Timer_Range- Timer_Reload_Value)) where N = the TCLK prescaler value: 4, 16, or 64. and Timer_Range = 256 for timer 1 in mode 2. 65536 for timer 1 in mode 0 and timer 2 in count up mode. The timer reload value may be calculated as follows: Timer_Reload_Value = Timer_Range-(Osc/(Baud_Rate*N*16)) NOTES: 1. The maximum baud rate for a UART in mode 1 or 3 is Osc/64. 2. The lowest possible baud rate (for a given oscillator frequency and N value) may be found by using a timer reload value of 0. 3. The timer reload value may never be larger than the timer range. 4. If a timer reload value calculation gives a negative or fractional result, the baud rate requested is not possible at the given oscillator frequency and N value. Baud Rate for UART Mode 2: Baud_Rate = Osc/32
Prescaler Select for Timer Clock (TCLK) SCR 0x440 bit3 PT1 bit2 PT0
SnSTAT Address: S0STAT 421 S1STAT 425 Bit Addressable Reset Value: 00H
MSB -- -- -- -- FEn BRn OEn
LSB STINTn
BIT SYMBOL FUNCTION SnSTAT.3 FEn Framing Error flag is set when the receiver fails to see a valid STOP bit at the end of the frame. Cleared by software. SnSTAT.2 BRn Break Detect flag is set if a character is received with all bits (including STOP bit) being logic `0'. Thus it gives a "Start of Break Detect" on bit 8 for Mode 1 and bit 9 for Modes 2 and 3. The break detect feature operates independently of the UARTs and provides the START of Break Detect status bit that a user program may poll. Cleared by software. SnSTAT.1 OEn Overrun Error flag is set if a new character is received in the receiver buffer while it is still full (before the software has read the previous character from the buffer), i.e., when bit 8 of a new byte is received while RI in SnCON is still set. Cleared by software. SnSTAT.0 STINTn This flag must be set to enable any of the above status flags to generate a receive interrupt (RIn). The only way it can be cleared is by a software write to this register. Figure 11. Serial Port Extended Status (SnSTAT) Register (See also Figure 13 regarding Framing Error flag)
SU00607B
2002 Mar 25
16
Philips Semiconductors
Product data
XA 16-bit microcontroller family
32K OTP, 512 B RAM, watchdog, 2 UARTs
XA-G37
UART INTERRUPT SCHEME
There are separate interrupt vectors for each UART's transmit and receive functions.
Table 3. Vector Locations for UARTs in XA
Vector Address A0H - A3H A4H - A7H A8H - ABH ACH - AFH Interrupt Source UART 0 Receiver UART 0 Transmitter UART 1 Receiver UART 1 Transmitter 7 8 9 10 Arbitration
Given slave address or addresses. All of the slaves may be contacted by using the Broadcast address. Two special Function Registers are used to define the slave's address, SADDR, and the address mask, SADEN. SADEN is used to define which bits in the SADDR are to be used and which bits are "don't care". The SADEN mask can be logically ANDed with the SADDR to create the "Given" address which the master will use for addressing each of the slaves. Use of the Given address allows multiple slaves to be recognized while excluding others. The following examples will help to show the versatility of this scheme: Slave 0 SADDR = SADEN = Given = SADDR = SADEN = Given = 1100 0000 1111 1101 1100 00X0 1100 0000 1111 1110 1100 000X
NOTE: The transmit and receive vectors could contain the same ISR address to work like a 8051 interrupt scheme Error Handling, Status Flags and Break Detect The UARTs in XA has the following error flags; see Figure 11.
Slave 1
Multiprocessor Communications
Modes 2 and 3 have a special provision for multiprocessor communications. In these modes, 9 data bits are received. The 9th one goes into RB8. Then comes a stop bit. The port can be programmed such that when the stop bit is received, the serial port interrupt will be activated only if RB8 = 1. This feature is enabled by setting bit SM2 in SCON. A way to use this feature in multiprocessor systems is as follows: When the master processor wants to transmit a block of data to one of several slaves, it first sends out an address byte which identifies the target slave. An address byte differs from a data byte in that the 9th bit is 1 in an address byte and 0 in a data byte. With SM2 = 1, no slave will be interrupted by a data byte. An address byte, however, will interrupt all slaves, so that each slave can examine the received byte and see if it is being addressed. The addressed slave will clear its SM2 bit and prepare to receive the data bytes that will be coming. The slaves that weren't being addressed leave their SM2s set and go on about their business, ignoring the coming data bytes. SM2 has no effect in Mode 0, and in Mode 1 can be used to check the validity of the stop bit although this is better done with the Framing Error (FE) flag. In a Mode 1 reception, if SM2 = 1, the receive interrupt will not be activated unless a valid stop bit is received. Automatic Address Recognition Automatic Address Recognition is a feature which allows the UART to recognize certain addresses in the serial bit stream by using hardware to make the comparisons. This feature saves a great deal of software overhead by eliminating the need for the software to examine every serial address which passes by the serial port. This feature is enabled by setting the SM2 bit in SCON. In the 9 bit UART modes, mode 2 and mode 3, the Receive Interrupt flag (RI) will be automatically set when the received byte contains either the "Given" address or the "Broadcast" address. The 9 bit mode requires that the 9th information bit is a 1 to indicate that the received information is an address and not data. Automatic address recognition is shown in Figure 14. Using the Automatic Address Recognition feature allows a master to selectively communicate with one or more slaves by invoking the
In the above example SADDR is the same and the SADEN data is used to differentiate between the two slaves. Slave 0 requires a 0 in bit 0 and it ignores bit 1. Slave 1 requires a 0 in bit 1 and bit 0 is ignored. A unique address for Slave 0 would be 1100 0010 since slave 1 requires a 0 in bit 1. A unique address for slave 1 would be 1100 0001 since a 1 in bit 0 will exclude slave 0. Both slaves can be selected at the same time by an address which has bit 0 = 0 (for slave 0) and bit 1 = 0 (for slave 1). Thus, both could be addressed with 1100 0000. In a more complex system the following could be used to select slaves 1 and 2 while excluding slave 0: Slave 0 SADDR = SADEN = Given = SADDR = SADEN = Given = SADDR = SADEN = Given = 1100 0000 1111 1001 1100 0XX0 1110 0000 1111 1010 1110 0X0X 1110 0000 1111 1100 1110 00XX
Slave 1
Slave 2
In the above example the differentiation among the 3 slaves is in the lower 3 address bits. Slave 0 requires that bit 0 = 0 and it can be uniquely addressed by 1110 0110. Slave 1 requires that bit 1 = 0 and it can be uniquely addressed by 1110 and 0101. Slave 2 requires that bit 2 = 0 and its unique address is 1110 0011. To select Slaves 0 and 1 and exclude Slave 2 use address 1110 0100, since it is necessary to make bit 2 = 1 to exclude slave 2. The Broadcast Address for each slave is created by taking the logical OR of SADDR and SADEN. Zeros in this result are teated as don't-cares. In most cases, interpreting the don't-cares as ones, the broadcast address will be FF hexadecimal. Upon reset SADDR and SADEN are loaded with 0s. This produces a given address of all "don't cares" as well as a Broadcast address of all "don't cares". This effectively disables the Automatic Addressing mode and allows the microcontroller to use standard UART drivers which do not make use of this feature.
2002 Mar 25
17
Philips Semiconductors
Product data
XA 16-bit microcontroller family
32K OTP, 512 B RAM, watchdog, 2 UARTs
XA-G37
SnCON
Address:
S0CON 420 S1CON 424
MSB SM0 SM1 SM2 REN TB8 RB8 TI
LSB RI
Bit Addressable Reset Value: 00H SM0 0 0 1 1
Where SM0, SM1 specify the serial port mode, as follows: SM1 0 1 0 1 Mode 0 1 2 3 Description shift register 8-bit UART 9-bit UART 9-bit UART Baud Rate fOSC/16 variable fOSC/32 variable
BIT SYMBOL FUNCTION SnCON.5 SM2 Enables the multiprocessor communication feature in Modes 2 and 3. In Mode 2 or 3, if SM2 is set to 1, then RI will not be activated if the received 9th data bit (RB8) is 0. In Mode 1, if SM2=1 then RI will not be activated if a valid stop bit was not received. In Mode 0, SM2 should be 0. SnCON.4 REN Enables serial reception. Set by software to enable reception. Clear by software to disable reception. SnCON.3 TB8 The 9th data bit that will be transmitted in Modes 2 and 3. Set or clear by software as desired. The TB8 bit is not double buffered. See text for details. SnCON.2 RB8 In Modes 2 and 3, is the 9th data bit that was received. In Mode 1, if SM2=0, RB8 is the stop bit that was received. In Mode 0, RB8 is not used. SnCON.1 TI Transmit interrupt flag. Set when another byte may be written to the UART transmitter. See text for details. Must be cleared by software. SnCON.0 RI Receive interrupt flag. Set by hardware at the end of the 8th bit time in Mode 0, or at the end of the stop bit time in the other modes (except see SM2). Must be cleared by software.
SU00597C
Figure 12. Serial Port Control (SnCON) Register
D0
D1
D2
D3
D4
D5
D6
D7
D8
START BIT
DATA BYTE
ONLY IN MODE 2, 3
STOP BIT
if 0, sets FE
--
--
--
--
FEn
BRn
OEn
STINTn
SnSTAT
SU00598
Figure 13. UART Framing Error Detection
D0
D1
D2
D3
D4
D5
D6
D7
D8
SM0_n 1 1
SM1_n 1 0
SM2_n 1
REN_n 1
TB8_n X
RB8_n
TI_n
RI_n
SnCON
RECEIVED ADDRESS D0 TO D7 PROGRAMMED ADDRESS COMPARATOR
IN UART MODE 2 OR MODE 3 AND SM2 = 1: INTERRUPT IF REN=1, RB8=1 AND "RECEIVED ADDRESS" = "PROGRAMMED ADDRESS" - WHEN OWN ADDRESS RECEIVED, CLEAR SM2 TO RECEIVE DATA BYTES - WHEN ALL DATA BYTES HAVE BEEN RECEIVED: SET SM2 TO WAIT FOR NEXT ADDRESS.
SU00613
Figure 14. UART Multiprocessor Communication, Automatic Address Recognition 2002 Mar 25 18
Philips Semiconductors
Product data
XA 16-bit microcontroller family
32K OTP, 512 B RAM, watchdog, 2 UARTs
XA-G37
I/O PORT OUTPUT CONFIGURATION
Each I/O port pin can be user configured to one of 4 output types. The types are Quasi-bidirectional (essentially the same as standard 80C51 family I/O ports), Open-Drain, Push-Pull, and Off (high impedance). The default configuration after reset is Quasi-bidirectional. However, in the ROMless mode (the EA pin is low at reset), the port pins that comprise the external data bus will default to push-pull outputs. I/O port output configurations are determined by the settings in port configuration SFRs. There are 2 SFRs for each port, called PnCFGA and PnCFGB, where "n" is the port number. One bit in each of the 2 SFRs relates to the output setting for the corresponding port pin, allowing any combination of the 2 output types to be mixed on those port pins. For instance, the output type of port 1 pin 3 is controlled by the setting of bit 3 in the SFRs P1CFGA and P1CFGB. Table 4 shows the configuration register settings for the 4 port output types. The electrical characteristics of each output type may be found in the DC Characteristic table.
As it is brought high again, an exception is generated which causes the processor to jump to the address contained in the memory location 0000. The destination of the reset jump must be located in the first 64k of code address on power-up, all vectors are 16-bit values and so point to page zero addresses only. After a reset the RAM contents are indeterminate.
VDD
R RST C
XA
SOME TYPICAL VALUES FOR R AND C: R = 100K, C = 1.0 F R = 1.0M, C = 0.1 F (ASSUMING THAT THE VDD RISE TIME IS 1ms OR LESS)
SU00702
Figure 15. Recommended Reset Circuit
Table 4. Port Configuration Register Settings
PnCFGB 0 0 1 1 PnCFGA 0 1 0 1 Port Output Mode Open Drain Quasi-bidirectional Off (high impedance) Push-Pull
RESET OPTIONS
The EA pin is sampled on the rising edge of the RST pulse, and determines whether the device is to begin execution from internal or external code memory. EA pulled high configures the XA in single-chip mode. If EA is driven low, the device enters ROMless mode. After Reset is released, the EA/WAIT pin becomes a bus wait signal for external bus transactions. The BUSW/P3.5 pin is weakly pulled high while reset is asserted, allowing simple biasing of the pin with a resistor to ground to select the alternate bus width. If the BUSW pin is not driven at reset, the weak pullup will cause a 1 to be loaded for the bus width, giving a 16-bit external bus. BUSW may be pulled low with a 2.7K or smaller value resistor, giving an 8-bit external bus. The bus width setting from the BUSW pin may be overridden by software once the user program is running. Both EA and BUSW must be held for three oscillator clock times after reset is deasserted to guarantee that their values are latched correctly.
NOTE: Mode changes may cause glitches to occur during transitions. When modifying both registers, WRITE instructions should be carried out consecutively.
EXTERNAL BUS
The external program/data bus allows for 8-bit or 16-bit bus width, and address sizes from 12 to 20 bits. The bus width is selected by an input at reset (see Reset Options below), while the address size is set by the program in a configuration register. If all off-chip code is selected (through the use of the EA pin), the initial code fetches will be done with the maximum address size (20 bits).
POWER REDUCTION MODES
The XA-G37 supports Idle and Power Down modes of power reduction. The idle mode leaves some peripherals running to allow them to wake up the processor when an interrupt is generated. The power down mode stops the oscillator in order to minimize power. The processor can be made to exit power down mode via reset or one of the external interrupt inputs. In order to use an external interrupt to re-activate the XA while in power down mode, the external interrupt must be enabled and be configured to level sensitive mode. In power down mode, the power supply voltage may be reduced to the RAM keep-alive voltage (2 V), retaining the RAM, register, and SFR values at the point where the power down mode was entered.
RESET
The device is reset whenever a logic "0" is applied to RST for at least 10 microseconds, placing a low level on the pin re-initializes the on-chip logic. Reset must be asserted when power is initially applied to the XA and held until the oscillator is running. The duration of reset must be extended when power is initially applied or when using reset to exit power down mode. This is due to the need to allow the oscillator time to start up and stabilize. For most power supply ramp up conditions, this time is 10 milliseconds.
2002 Mar 25
19
Philips Semiconductors
Product data
XA 16-bit microcontroller family
32K OTP, 512 B RAM, watchdog, 2 UARTs
XA-G37
INTERRUPTS
The XA-G37 supports 38 vectored interrupt sources. These include 9 maskable event interrupts, 7 exception interrupts, 16 trap interrupts, and 7 software interrupts. The maskable interrupts each have 8 priority levels and may be globally and/or individually enabled or disabled. The XA defines four types of interrupts:
* Exception Interrupts - These are system level errors and other * Event interrupts - These are peripheral interrupts from devices * Software Interrupts - These are equivalent of hardware * Trap Interrupts - These are TRAP instructions, generally used to
call system services in a multi-tasking system. Exception interrupts, software interrupts, and trap interrupts are generally standard for XA derivatives and are detailed in the XA User Guide. Event interrupts tend to be different on different XA derivatives. interrupt, but are requested only under software control. such as UARTs, timers, and external interrupt inputs. very important occurrences which include stack overflow, divide-by-0, and reset.
The XA-G37 supports a total of 9 maskable event interrupt sources (for the various XA peripherals), seven software interrupts, 5 exception interrupts (plus reset), and 16 traps. The maskable event interrupts share a global interrupt disable bit (the EA bit in the IEL register) and each also has a separate individual interrupt enable bit (in the IEL or IEH registers). Only three bits of the IPA register values are used on the XA-G3. Each event interrupt can be set to occur at one of 8 priority levels via bits in the Interrupt Priority (IP) registers, IPA0 through IPA5. The value 0 in the IPA field gives the interrupt priority 0, in effect disabling the interrupt. A value of 1 gives the interrupt a priority of 9, the value 2 gives priority 10, etc. The result is the same as if all four bits were used and the top bit set for all values except 0. Details of the priority scheme may be found in the XA User Guide. The complete interrupt vector list for the XA-G3, including all 4 interrupt types, is shown in the following tables. The tables include the address of the vector for each interrupt, the related priority register bits (if any), and the arbitration ranking for that interrupt source. The arbitration ranking determines the order in which interrupts are processed if more than one interrupt of the same priority occurs simultaneously.
Table 5. Interrupt Vectors EXCEPTION/TRAPS PRECEDENCE
DESCRIPTION Reset (h/w, watchdog, s/w) Breakpoint (h/w trap 1) Trace (h/w trap 2) Stack Overflow (h/w trap 3) Divide by 0 (h/w trap 4) User RETI (h/w trap 5) TRAP 0- 15 (software) VECTOR ADDRESS 0000-0003 0004-0007 0008-000B 000C-000F 0010-0013 0014-0017 0040-007F ARBITRATION RANKING 0 (High) 1 1 1 1 1 1
EVENT INTERRUPTS
DESCRIPTION External interrupt 0 Timer 0 interrupt External interrupt 1 Timer 1 interrupt Timer 2 interrupt Serial port 0 Rx Serial port 0 Tx Serial port 1 Rx Serial port 1 Tx FLAG BIT IE0 TF0 IE1 TF1 TF2(EXF2) RI.0 TI.0 RI.1 TI.1 VECTOR ADDRESS 0080-0083 0084-0087 0088-008B 008C-008F 0090-0093 00A0-00A3 00A4-00A7 00A8-00AB 00AC-00AF ENABLE BIT EX0 ET0 EX1 ET1 ET2 ERI0 ETI0 ERI1 ETI1 INTERRUPT PRIORITY IPA0.2-0 (PX0) IPA0.6-4 (PT0) IPA1.2-0 (PX1) IPA1.6-4 (PT1) IPA2.2-0 (PT2) IPA4.2-0 (PRIO) IPA4.6-4 (PTIO) IPA5.2-0 (PRT1) IPA5.6-4 (PTI1) ARBITRATION RANKING 2 3 4 5 6 7 8 9 10
SOFTWARE INTERRUPTS
DESCRIPTION Software interrupt 1 Software interrupt 2 Software interrupt 3 Software interrupt 4 Software interrupt 5 Software interrupt 6 Software interrupt 7 2002 Mar 25 FLAG BIT SWR1 SWR2 SWR3 SWR4 SWR5 SWR6 SWR7 VECTOR ADDRESS 0100-0103 0104-0107 0108-010B 010C-010F 0110-0113 0114-0117 0118-011B 20 ENABLE BIT SWE1 SWE2 SWE3 SWE4 SWE5 SWE6 SWE7 INTERRUPT PRIORITY (fixed at 1) (fixed at 2) (fixed at 3) (fixed at 4) (fixed at 5) (fixed at 6) (fixed at 7)
Philips Semiconductors
Product data
XA 16-bit microcontroller family
32K OTP, 512 B RAM, watchdog, 2 UARTs
XA-G37
ABSOLUTE MAXIMUM RATINGS
PARAMETER Operating temperature under bias Storage temperature range Voltage on EA/VPP pin to VSS Voltage on any other pin to VSS Maximum IOL per I/O pin Power dissipation (based on package heat transfer limitations, not device power consumption) RATING -55 to +125 -65 to +150 0 to +13.0 -0.5 to VDD+0.5 V 15 1.5 UNIT C C V V mA W
DC ELECTRICAL CHARACTERISTICS
VDD = 2.7 V to 5.5 V unless otherwise specified; VDD = Tamb = 0 to 70 C for commercial, -40 C to +85 C for industrial, unless otherwise specified. SYMBOL Supplies IDD IID IPD IPDI VRAM VIL VIH VIH1 VOL VOH1 VOH2 CIO IIL ILI ITL Supply current operating9,10 Idle mode supply current9,10 Power-down current Power-down current (-40C to +85C) RAM-keep-alive voltage Input low voltage In ut Input high voltage except XTAL1 RST voltage, exce t XTAL1, Input high voltage to XTAL1, RST Output low voltage all ports ALE, PSEN3 Out ut orts, ALE Out ut Output high voltage all ports ALE PSEN1 orts, ALE, Output high voltage, ports P0-3, ALE, PSEN2 voltage orts P0-3 ALE Out ut Input/Output pin capacitance Logical 0 input current, P0-36 Input leakage current, P0-35 Logical 1 to 0 transition current all ports4 fosc = 30 MHz fosc = 30 MHz - - RAM-keep-alive voltage - At 5.0 V At 3.3 V For both 3.0 & 5.0 V IOL = 3.2mA, VDD = 5.0 V 1.0mA, VDD = 3.0 V IOH = -100mA, VDD = 4.5 V IOH = -15mA, VDD = 2.7 V IOH = 3.2mA, VDD = 4.5 V IOH = 1mA, VDD = 2.7 V - VIN = 0.45 V VIN = VIL or VIH At 5.5 V - - - - 1.5 -0.5 2.2 2 0.7 VDD - - 2.4 2.0 2.4 2.2 - - - - -25 60 22 15 80 30 100 150 - 0.22 VDD - - - 0.5 0.4 - - - - 15 -75 10 -650 mA mA mA mA V V V V V V V V V V V pF mA mA mA PARAMETER TEST CONDITIONS LIMITS MIN TYP MAX UNIT
NOTES: 1. Ports in Quasi bi-directional mode with weak pull-up (applies to ALE, PSEN only during RESET). 2. Ports in Push-Pull mode, both pull-up and pull-down assumed to be same strength 3. In all output modes 4. Port pins source a transition current when used in quasi-bidirectional mode and externally driven from 1 to 0. This current is highest when VIN is approximately 2 V. 5. Measured with port in high impedance output mode. 6. Measured with port in quasi-bidirectional output mode. 7. Load capacitance for all outputs=80 pF. 8. Under steady state (non-transient) conditions, IOL must be externally limited as follows: 15 mA (*NOTE: This is 85C specification for VDD = 5 V.) Maximum IOL per port pin: Maximum IOL per 8-bit port: 26 mA Maximum total IOL for all output: 71 mA If IOL exceeds the test condition, VOL may exceed the related specification. Pins are not guaranteed to sink current greater than the listed test conditions. 9. See Figures 25, 26, 29, and 30 for IDD test conditions, and Figures 27 and 28 for ICC vs. Frequency. Max. 5 V Active IDD = (fosc * 1.77 mA) + 7 mA Max. 5 V Idle IDD = (fosc * 0.87 mA) + 4 mA Max. 3 V Active IDD = (fosc * 0.77 mA) + 7 mA Max. 3 V Idle IDD = (fosc * 0.54 mA) + 4 mA 10. VDDMIN = 2.85 V for operating at fOSC = 30 MHz and -40 C to +85 C
2002 Mar 25
21
Philips Semiconductors
Product data
XA 16-bit microcontroller family
32K OTP, 512 B RAM, watchdog, 2 UARTs
XA-G37
AC ELECTRICAL CHARACTERISTICS
VDD = 2.7 V to 5.5 V; Tamb = 0 to +70 C for commercial, -40 C to +85 C for industrial. VARIABLE CLOCK SYMBOL FIGURE PARAMETER MIN MAX UNIT External Clock fC Oscillator frequency All devices except PXAG37KFx PXAG37KFx Tamb = -40 C to +85 C tC tCHCX tCLCX tCLCH tCHCL 22 22 22 22 22 Clock period and CPU timing cycle Clock high time Clock low time Clock rise time Clock fall time VDD = 2.85 V to 5.5 V VDD = 2.7 V to 2.85 V 0 0 0 1/fC tC * 0.5 tC * 0.4 5 5 30 30 25 MHz MHz MHz ns ns ns ns ns
AC ELECTRICAL CHARACTERISTICS (VDD = 4.5 V TO 5.5 V)
Tamb = 0 to +70 C for commercial, -40 C to +85 C for industrial. SYMBOL FIGURE VARIABLE CLOCK PARAMETER MIN 10 (V1 * tC) - 6 (V1 * tC) - 12 (tC/2) - 10 (V2 * tC) - 10 (tC/2) - 7 (V3 * tC) - 36 (V4 * tC) - 29 (V2 * tC) - 29 0 tC - 8 0 (V7 * tC) - 10 (tC/2) - 7 (V6 * tC) - 36 (V5 * tC) - 29 (V7 * tC) - 29 0 tC - 8 0 (V8 * tC) - 10 (V12 * tC) - 10 (V13 * tC) - 22 (V11 * tC) - 5 (V9 * tC) - 22 (V11 * tC) - 7 (V10 * tC) - 30 (V10 * tC) - 5 MAX 46 UNIT Address Cycle tCRAR 21 tLHLL 16 tAVLL 16 tLLAX 16 Code Read Cycle tPLPH 16 tLLPL 16 tAVIVA 16 tAVIVB 17 tPLIV 16 tPXIX 16 tPXIZ 16 tIXUA 16 Data Read Cycle tRLRH 18 tLLRL 18 tAVDVA 18 tAVDVB 19 tRLDV 18 tRHDX 18 tRHDZ 18 tDXUA 18 Data Write Cycle tWLWH 20 tLLWL 20 tQVWX 20 tWHQX 20 tAVWL 20 tUAWH 20 Wait Input tWTH 21 tWTL 21 NOTES ON PAGE 23.
Delay from clock rising edge to ALE rising edge ALE pulse width (programmable) Address valid to ALE de-asserted (set-up) Address hold after ALE de-asserted PSEN pulse width ALE de-asserted to PSEN asserted Address valid to instruction valid, ALE cycle (access time) Address valid to instruction valid, non-ALE cycle (access time) PSEN asserted to instruction valid (enable time) Instruction hold after PSEN de-asserted Bus 3-State after PSEN de-asserted (disable time) Hold time of unlatched part of address after instruction latched RD pulse width ALE de-asserted to RD asserted Address valid to data input valid, ALE cycle (access time) Address valid to data input valid, non-ALE cycle (access time) RD low to valid data in, enable time Data hold time after RD de-asserted Bus 3-State after RD de-asserted (disable time) Hold time of unlatched part of address after data latched WR pulse width ALE falling edge to WR asserted Data valid before WR asserted (data setup time) Data hold time after WR de-asserted (Note 6) Address valid to WR asserted (address setup time) (Note 5) Hold time of unlatched part of address after WR is de-asserted WAIT stable after bus strobe (RD, WR, or PSEN) asserted WAIT hold after bus strobe (RD, WR, or PSEN) assertion
ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns
2002 Mar 25
22
Philips Semiconductors
Product data
XA 16-bit microcontroller family
32K OTP, 512 B RAM, watchdog, 2 UARTs
XA-G37
AC ELECTRICAL CHARACTERISTICS (VDD = 2.7 V TO 4.5 V)
Tamb = 0 to +70 C for commercial, -40 C to +85 C for industrial. SYMBOL FIGURE VARIABLE CLOCK PARAMETER MIN MAX UNIT
Address Cycle tCRAR tLHLL tAVLL tLLAX tPLPH tLLPL tAVIVA tAVIVB tPLIV tPXIX tPXIZ tIXUA Data Read Cycle tRLRH tLLRL tAVDVA tAVDVB tRLDV tRHDX tRHDZ tDXUA Data Write Cycle tWLWH tLLWL tQVWX tWHQX tAVWL tUAWH Wait Input tWTH tWTL 21 21 WAIT stable after bus strobe (RD, WR, or PSEN) asserted WAIT hold after bus strobe (RD, WR, or PSEN) assertion (V10 * tC) - 5 (V10 * tC) - 40 ns ns 20 20 20 20 20 20 WR pulse width ALE falling edge to WR asserted Data valid before WR asserted (data setup time) Data hold time after WR de-asserted (Note 6) Address valid to WR asserted (address setup time) (Note 5) Hold time of unlatched part of address after WR is de-asserted (V8 * tC) - 12 (V12 * tC) - 10 (V13 * tC) - 28 (V11 * tC) - 8 (V9 * tC) - 28 (V11 * tC) - 10 ns ns ns ns ns ns 18 18 18 19 18 18 18 18 RD pulse width ALE de-asserted to RD asserted Address valid to data input valid, ALE cycle (access time) Address valid to data input valid, non-ALE cycle (access time) RD low to valid data in, enable time Data hold time after RD de-asserted Bus 3-State after RD de-asserted (disable time) Hold time of unlatched part of address after data latched 0 0 tC - 8 (V7 * tC) - 12 (tC/2) - 9 (V6 * tC) - 58 (V5 * tC) - 52 (V7 * tC) - 52 ns ns ns ns ns ns ns ns 21 16 16 16 Delay from clock rising edge to ALE rising edge ALE pulse width (programmable) Address valid to ALE de-asserted (set-up) Address hold after ALE de-asserted 15 (V1 * tC) - 10 (V1 * tC) - 18 (tC/2) - 12 (V2 * tC) - 12 (tC/2) - 9 (V3 * tC) - 58 (V4 * tC) - 52 (V2 * tC) - 52 0 tC - 8 0 60 ns ns ns ns
Code Read Cycle 16 16 16 17 16 16 16 16 PSEN pulse width ALE de-asserted to PSEN asserted Address valid to instruction valid, ALE cycle (access time) Address valid to instruction valid, non-ALE cycle (access time) PSEN asserted to instruction valid (enable time) Instruction hold after PSEN de-asserted Bus 3-State after PSEN de-asserted (disable time) Hold time of unlatched part of address after instruction latched ns ns ns ns ns ns ns ns
NOTES: 1. Load capacitance for all outputs = 80 pF. 2. Variables V1 through V13 reflect programmable bus timing, which is programmed via the Bus Timing registers (BTRH and BTRL). Refer to the XA User Guide for details of the bus timing settings. V1) This variable represents the programmed width of the ALE pulse as determined by the ALEW bit in the BTRL register. V1 = 0.5 if the ALEW bit = 0, and 1.5 if the ALEW bit = 1. V2) This variable represents the programmed width of the PSEN pulse as determined by the CR1 and CR0 bits or the CRA1, CRA0, and ALEW bits in the BTRL register. - For a bus cycle with no ALE, V2 = 1 if CR1/0 = 00, 2 if CR1/0 = 01, 3 if CR1/0 = 10, and 4 if CR1/0 = 11. Note that during burst mode code fetches, PSEN does not exhibit transitions at the boundaries of bus cycles. V2 still applies for the purpose of determining peripheral timing requirements. - For a bus cycle with an ALE, V2 = the total bus cycle duration (2 if CRA1/0 = 00, 3 if CRA1/0 = 01, 4 if CRA1/0 = 10, and 5 if CRA1/0 = 11) minus the number of clocks used by ALE (V1 + 0.5). Example: If CRA1/0 = 10 and ALEW = 1, the V2 = 4 - (1.5 + 0.5) = 2.
2002 Mar 25
23
Philips Semiconductors
Product data
XA 16-bit microcontroller family
32K OTP, 512 B RAM, watchdog, 2 UARTs
XA-G37
3. 4.
5. 6.
This variable represents the programmed length of an entire code read cycle with ALE. This time is determined by the CRA1 and CRA0 bits in the BTRL register. V3 = the total bus cycle duration (2 if CRA1/0 = 00, 3 if CRA1/0 = 01, 4 if CRA1/0 = 10, and 5 if CRA1/0 = 11). V4) This variable represents the programmed length of an entire code read cycle with no ALE. This time is determined by the CR1 and CR0 bits in the BTRL register. V4 = 1 if CR1/0 = 00, 2 if CR1/0 = 01, 3 if CR1/0 = 10, and 4 if CR1/0 = 11. V5) This variable represents the programmed length of an entire data read cycle with no ALE. this time is determined by the DR1 and DR0 bits in the BTRH register. V5 = 1 if DR1/0 = 00, 2 if DR1/0 = 01, 3 if DR1/0 = 10, and 4 if DR1/0 = 11. V6) This variable represents the programmed length of an entire data read cycle with ALE. The time is determined by the DRA1 and DRA0 bits in the BTRH register. V6 = the total bus cycle duration (2 if DRA1/0 = 00, 3 if DRA1/0 = 01, 4 if DRA1/0 = 10, and 5 if DRA1/0 = 11). V7) This variable represents the programmed width of the RD pulse as determined by the DR1 and DR0 bits or the DRA1, DRA0 in the BTRH register, and the ALEW bit in the BTRL register. Note that during a 16-bit operation on an 8-bit external bus, RD remains low and does not exhibit a transition between the first and second byte bus cycles. V7 still applies for the purpose of determining peripheral timing requirements. The timing for the first byte is for a bus cycle with ALE, the timing for the second byte is for a bus cycle with no ALE. - For a bus cycle with no ALE, V7 = 1 if DR1/0 = 00, 2 if DR1/0 = 01, 3 if DR1/0 = 10, and 4 if DR1/0 = 11. - For a bus cycle with an ALE, V7 = the total bus cycle duration (2 if DRA1/0 = 00, 3 if DRA1/0 = 01, 4 if DRA1/0 = 10, and 5 if DRA1/0 = 11) minus the number of clocks used by ALE (V1 + 0.5). Example: If DRA1/0 = 00 and ALEW = 0, then V7 = 2 - (0.5 + 0.5) = 1. V8) This variable represents the programmed width of the WRL and/or WRH pulse as determined by the WM1 bit in the BTRL register. V8 1 if WM1 = 0, and 2 if WM1 = 1. V9) This variable represents the programmed address setup time for a write as determined by the data write cycle duration (defined by DW1 and DW0 or the DWA1 and DWA0 bits in the BTRH register), the WM0 bit in the BTRL register, and the value of V8. - For a bus cycle with an ALE, V9 = the total bus write cycle duration (2 if DWA1/0 = 00, 3 if DWA1/0 = 01, 4 if DWA1/0 = 10, and 5 if DWA1/0 = 11) minus the number of clocks used by the WRL and/or WRH pulse (V8), minus the number of clocks used by data hold time (0 if WM0 = 0 and 1 if WM0 = 1). Example: If DWA1/0 = 10, WM0 = 1, and WM1 = 1, then V9 = 4 - 1 - 2 = 1. - For a bus cycle with no ALE, V9 = the total bus cycle duration (2 if DW1/0 = 00, 3 if DW1/0 = 01, 4 if DW1/0 = 10, and 5 if DW1/0 = 11) minus the number of clocks used by the WRL and/or WRH pulse (V8), minus the number of clocks used by data hold time (0 if WM0 = 0 and 1 if WM0 = 1). Example: If DW1/0 = 11, WM0 = 1, and WM1 = 0, then V9 = 5 - 1 - 1 = 3. V10) This variable represents the length of a bus strobe for calculation of WAIT setup and hold times. The strobe may be RD (for data read cycles), WRL and/or WRH (for data write cycles), or PSEN (for code read cycles), depending on the type of bus cycle being widened by WAIT. V10 = V2 for WAIT associated with a code read cycle using PSEN. V10 = V8 for a data write cycle using WRL and/or WRH. V10 = V7-1 for a data read cycle using RD. This means that a single clock data read cycle cannot be stretched using WAIT. If WAIT is used to vary the duration of data read cycles, the RD strobe width must be set to be at least two clocks in duration. Also see Note 4. V11) This variable represents the programmed write hold time as determined by the WM0 bit in the BTRL register. V11 = 0 if the WM0 bit = 0, and 1 if the WM0 bit = 1. V12) This variable represents the programmed period between the end of the ALE pulse and the beginning of the WRL and/or WRH pulse as determined by the data write cycle duration (defined by the DWA1 and DWA0 bits in the BTRH register), the WM0 bit in the BTRL register, and the values of V1 and V8. V12 = the total bus cycle duration (2 if DWA1/0 = 00, 3 if DWA1/0 = 01, 4 if DWA1/0 = 10, and 5 if DWA1/0 = 11) minus the number of clocks used by the WRL and/or WRH pulse (V8), minus the number of clocks used by data hold time (0 if WM0 = 0 and 1 if WM0 = 1), minus the width of the ALE pulse (V1). Example: If DWA1/0 = 11, WM0 = 1, WM1 = 0, and ALEW = 1, then V12 = 5 - 1 - 1 - 1.5 = 1.5. V13) This variable represents the programmed data setup time for a write as determined by the data write cycle duration (defined by DW1 and DW0 or the DWA1 and DWA0 bits in the BTRH register), the WM0 bit in the BTRL register, and the values of V1 and V8. - For a bus cycle with an ALE, V13 = the total bus cycle duration (2 if DWA1/0 = 00, 3 if DWA1/0 = 01, 4 if DWA1/0 = 10, and 5 if DWA1/0 = 11) minus the number of clocks used by the WRL and/or WRH pulse (V8), minus the number of clocks used by data hold time (0 if WM0 = 0 and 1 if WM0 = 1), minus the number of clocks used by ALE (V1 + 0.5). Example: If DWA1/0 = 11, WM0 = 1, WM1 = 1, and ALEW = 0, then V13 = 5 - 1 - 2 - 1 = 1. - For a bus cycle with no ALE, V13 = the total bus cycle duration (2 if DW1/0 = 00, 3 if DW1/0 = 01, 4 if DW1/0 = 10, and 5 if DW1/0 = 11) minus the number of clocks used by the WRL and/or WRH pulse (V8), minus the number of clocks used by data hold time (0 if WM0 = 0 and 1 if WM0 = 1). Example: If DW1/0 = 01, WM0 = 1, and WM1 = 0, then V13 = 3 - 1 - 1 = 1. Not all combinations of bus timing configuration values result in valid bus cycles. Please refer to the XA User Guide section on the External Bus for details. When code is being fetched for execution on the external bus, a burst mode fetch is used that does not have PSEN edges in every fetch cycle. Thus, if WAIT is used to delay code fetch cycles, a change in the low order address lines must be detected to locate the beginning of a cycle. This would be A3-A0 for an 8-bit bus, and A3-A1 for a 16-bit bus. Also, a 16-bit data read operation conducted on a 8-bit wide bus similarly does not include two separate RD strobes. So, a rising edge on the low order address line (A0) must be used to trigger a WAIT in the second half of such a cycle. This parameter is provided for peripherals that have the data clocked in on the falling edge of the WR strobe. This is not usually the case, and in most applications this parameter is not used. Please note that the XA-G37 requires that extended data bus hold time (WM0 = 1) to be used with external bus write cycles.
V3)
2002 Mar 25
24
Philips Semiconductors
Product data
XA 16-bit microcontroller family
32K OTP, 512 B RAM, watchdog, 2 UARTs
XA-G37
tLHLL
ALE
tAVLL
tLLPL
tPLPH tPLIV
PSEN
tLLAX
tPLAZ tPXIX
INSTR IN *
tPXIZ
MULTIPLEXED ADDRESS AND DATA
A4-A19
tAVIVA
UNMULTIPLEXED ADDRESS A1-A3
tIXUA
*
D0-D15 Figure 16. External Program Memory Read Cycle (ALE Cycle)
SU00946
ALE
PSEN
MULTIPLEXED ADDRESS AND DATA
A4-A11 or A4-A19
INSTR IN *
tAVIVB
UNMULTIPLEXED ADDRESS A0 or A1-A3, A12-19 A0 or A1-A3, A12-19
*
INSTR IN is either D0-D7 or D0-D15, depending on the bus width (8 or 16 bits). Figure 17. External Program Memory Read Cycle (Non-ALE Cycle)
SU00707
2002 Mar 25
25
Philips Semiconductors
Product data
XA 16-bit microcontroller family
32K OTP, 512 B RAM, watchdog, 2 UARTs
XA-G37
ALE
RD
tLLRL
tRLRH tRHDZ tRHDX
tAVLL
MULTIPLEXED ADDRESS AND DATA
tLLAX
tRLDV
A4-A11 or A4-A19
DATA IN
* tDXUA
tAVDVA
UNMULTIPLEXED ADDRESS A0 or A1-A3, A12-A19
*
DATA IN is either D0-D7 or D0-D15, depending on the bus width (8 or 16 bits). Figure 18. External Data Memory Read Cycle (ALE Cycle)
SU00947
ALE
RD
MULTIPLEXED ADDRESS AND DATA
A4-A11
D0-D7
DATA IN
*
tAVDVB
UNMULTIPLEXED ADDRESS A0-A3, A12-A19 A0-A3, A12-A19
SU00708A
Figure 19. External Data Memory Read Cycle (Non-ALE Cycle) 8 Bit Bus Only
2002 Mar 25
26
Philips Semiconductors
Product data
XA 16-bit microcontroller family
32K OTP, 512 B RAM, watchdog, 2 UARTs
XA-G37
ALE
tLLWL
WRL or WRH
tWLWH
tAVLL
MULTIPLEXED ADDRESS AND DATA
tLLAX
tQVWX
tWHQX
A4-A11 or A4-A15
DATA OUT *
tAVWL tUAWH
UNMULTIPLEXED ADDRESS A0 or A1-A3, A12-A19
*
DATA OUT is either D0-D7 or D0-D15, depending on the bus width (8 or 16 bits). Figure 20. External Data Memory Write Cycle
SU00584C
XTAL1 tCRAR ALE
ADDRESS BUS
WAIT
BUS STROBE (WRL, WRH, RD, OR PSEN) tWTH tWTL
(The dashed line shows the strobe without WAIT.)
SU00709A
Figure 21. WAIT Signal Timing
2002 Mar 25
27
Philips Semiconductors
Product data
XA 16-bit microcontroller family
32K OTP, 512 B RAM, watchdog, 2 UARTs
XA-G37
VDD-0.5 0.45V
0.7VDD 0.2VDD-0.1
tCHCL
tCLCX tC
tCHCX tCLCH
SU00842
Figure 22. External Clock Drive
VDD-0.5 0.2VDD+0.9 0.2VDD-0.1 0.45V NOTE: AC inputs during testing are driven at VDD -0.5 for a logic `1' and 0.45V for a logic `0'. Timing measurements are made at the 50% point of transitions.
SU00703A
Figure 23. AC Testing Input/Output
VLOAD+0.1V VLOAD VLOAD-0.1V
TIMING REFERENCE POINTS
VOH-0.1V VOL+0.1V
NOTE: For timing purposes, a port is no longer floating when a 100mV change from load voltage occurs, and begins to float when a 100mV change from the loaded VOH/VOL level occurs. IOH/IOL 20mA.
SU00011
Figure 24. Float Waveform
VDD
VDD
VDD RST VDD
VDD
RST EA (NC) CLOCK SIGNAL XTAL2 XTAL1 VSS (NC) CLOCK SIGNAL XTAL2 XTAL1 VSS EA
SU00591B
SU00590B
Figure 25. IDD Test Condition, Active Mode All other pins are disconnected
Figure 26. IDD Test Condition, Idle Mode All other pins are disconnected
2002 Mar 25
28
Philips Semiconductors
Product data
XA 16-bit microcontroller family
32K OTP, 512 B RAM, watchdog, 2 UARTs
XA-G37
80
MAX. IDD (ACTIVE)
70
60
TYPICAL IDD (ACTIVE)
50
40
mA
30
MAX. IDD (IDLE)
20
TYPICAL IDD (IDLE)
10
0 0 5 10 15 FREQUENCY 20 25 30
SU01661
Figure 27. IDD vs. Frequency at VDD = 5.0 V
30
MAX. IDD (ACTIVE)
25 TYPICAL IDD (ACTIVE)
20
MAX. IDD (IDLE)
mA
15 TYPICAL IDD (IDLE)
10
5
0 0 5 10 15 FREQUENCY 20 25 30
SU01193
Figure 28. IDD vs. Frequency at VDD = 3.0 V
2002 Mar 25
29
Philips Semiconductors
Product data
XA 16-bit microcontroller family
32K OTP, 512 B RAM, watchdog, 2 UARTs
XA-G37
VDD-0.5 0.45V
0.7VDD 0.2VDD-0.1
tCHCL
tCLCX tCL
tCHCX tCLCH
SU00608A
Figure 29. Clock Signal Waveform for IDD Tests in Active and Idle Modes tCLCH = tCHCL = 5ns
VDD VDD
VDD RST
EA (NC) XTAL2 XTAL1 VSS
SU00585A
Figure 30. IDD Test Condition, Power Down Mode All other pins are disconnected. VDD=2 V to 5.5 V
2002 Mar 25
30
Philips Semiconductors
Product data
XA 16-bit microcontroller family
32K OTP, 512 B RAM, watchdog, 2 UARTs
XA-G37
EPROM CHARACTERISTICS
The XA-G37 is programmed by using a modified Improved Quick-Pulse ProgrammingTM algorithm. This algorithm is essentially the same as that used by the later 80C51 family EPROM parts. However different pins are used for many programming functions. Detailed EPROM programming information may be obtained from the internet at www.philipsmcu.com/ftp.html. The XA-G37 contains three signature bytes that can be read and used by an EPROM programming system to identify the device. The signature bytes identify the device as an XA-Gx manufactured by Philips.
Security Bits
With none of the security bits programmed the code in the program memory can be verified. When only security bit 1 (see Table 6) is programmed, MOVC instructions executed from external program memory are disabled from fetching code bytes from the internal memory. All further programming of the EPROM is disabled. When security bits 1 and 2 are programmed, in addition to the above, verify mode is disabled. When all three security bits are programmed, all of the conditions above apply and all external program memory execution is disabled. (See Table 6)
Table 6. Program Security Bits
PROGRAM LOCK BITS SB1 1 2 3 4 U P P P SB2 U U P P SB3 U U U P PROTECTION DESCRIPTION No Program Security features enabled. MOVC instructions executed from external program memory are disabled from fetching code bytes from internal memory and further programming of the EPROM is disabled. Same as 2, also verify is disabled. Same as 3, external execution is disabled. Internal data RAM is not accessible.
NOTES: 1. P - programmed. U - unprogrammed. 2. Any other combination of the security bits is not defined.
TMTrademark phrase of Intel Corporation. 2002 Mar 25 31
Philips Semiconductors
Product data
XA 16-bit microcontroller family
32K OTP, 512 B RAM, watchdog, 2 UARTs
XA-G37
LQFP44: plastic low profile quad flat package; 44 leads; body 10 x 10 x 1.4 mm
SOT389-1
2002 Mar 25
32
Philips Semiconductors
Product data
XA 16-bit microcontroller family
32K OTP, 512 B RAM, watchdog, 2 UARTs
XA-G37
PLCC44: plastic leaded chip carrier; 44 leads
SOT187-2
2002 Mar 25
33
Philips Semiconductors
Product data
XA 16-bit microcontroller family
32K OTP, 512 B RAM, watchdog, 2 UARTs
XA-G37
REVISION HISTORY
Date 2002 Mar 25 CPCN 9397 750 09585 Description - Deleted information for XA-G33 - Spun off XA-G30 into a separate data sheet - Corrected Figure 27 (IDD vs. Frequency) - Corrected typical power down current to 15 A 2001 Jun 25 9397 750 08554 Previous release
2002 Mar 25
34
Philips Semiconductors
Product data
XA 16-bit microcontroller family
32K OTP, 512 B RAM, watchdog, 2 UARTs
XA-G37
Data sheet status
Data sheet status [1] Objective data Preliminary data Product status [2] Development Qualification Definitions This data sheet contains data from the objective specification for product development. Philips Semiconductors reserves the right to change the specification in any manner without notice. This data sheet contains data from the preliminary specification. Supplementary data will be published at a later date. Philips Semiconductors reserves the right to change the specification without notice, in order to improve the design and supply the best possible product. This data sheet contains data from the product specification. Philips Semiconductors reserves the right to make changes at any time in order to improve the design, manufacturing and supply. Changes will be communicated according to the Customer Product/Process Change Notification (CPCN) procedure SNW-SQ-650A.
Product data
Production
[1] Please consult the most recently issued data sheet before initiating or completing a design. [2] The product status of the device(s) described in this data sheet may have changed since this data sheet was published. The latest information is available on the Internet at URL http://www.semiconductors.philips.com.
Definitions
Short-form specification -- The data in a short-form specification is extracted from a full data sheet with the same type number and title. For detailed information see the relevant data sheet or data handbook. Limiting values definition -- Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 60134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability. Application information -- Applications that are described herein for any of these products are for illustrative purposes only. Philips Semiconductors make no representation or warranty that such applications will be suitable for the specified use without further testing or modification.
Disclaimers
Life support -- These products are not designed for use in life support appliances, devices or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips Semiconductors customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such application. Right to make changes -- Philips Semiconductors reserves the right to make changes, without notice, in the products, including circuits, standard cells, and/or software, described or contained herein in order to improve design and/or performance. Philips Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless otherwise specified.
Contact information
For additional information please visit http://www.semiconductors.philips.com. Fax: +31 40 27 24825
(c) Koninklijke Philips Electronics N.V. 2002 All rights reserved. Printed in U.S.A. Date of release: 03-02
For sales offices addresses send e-mail to: sales.addresses@www.semiconductors.philips.com.
Document order number:
9397 750 09585
Philips Semiconductors
2002 Mar 25 35

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