P89C51RD2 datasheet(41/68 Pages) PHILIPS

Part #	P89C51RD2

Description	80C51 8-bit Flash microcontroller family

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Manufacturer	PHILIPS [NXP Semiconductors]

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Philips Semiconductors

Preliminary data

P89C51RA2/RB2/RC2/RD2xx

80C51 8-bit Flash microcontroller family

8KB/16KB/32KB/64KB ISP/IAP Flash with 512B/512B/512B/1KB RAM

2002 Jul 18

41

INIT_WATCHDOG:

MOV CCAPM4, #4CH

; Module 4 in compare mode

MOV CCAP4L, #0FFH

; Write to low byte first

MOV CCAP4H, #0FFH

; Before PCA timer counts up to

; FFFF Hex, these compare values

; must be changed

ORL CMOD, #40H

; Set the WDTE bit to enable the

; watchdog timer without changing

; the other bits in CMOD

;

;********************************************************************

;

; Main program goes here, but CALL WATCHDOG periodically.

;

;********************************************************************

;

WATCHDOG:

CLR EA

; Hold off interrupts

MOV CCAP4L, #00

; Next compare value is within

MOV CCAP4H, CH

; 255 counts of the current PCA

SETB EA

; timer value

RET

Figure 37. PCA Watchdog Timer Initialization Code

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