參數(shù)資料
型號: 935265437112
廠商: NXP SEMICONDUCTORS
元件分類: 微控制器/微處理器
英文描述: 8-BIT, FLASH, 33 MHz, MICROCONTROLLER, PDIP40
封裝: PLASTIC, DIP-40
文件頁數(shù): 22/52頁
文件大?。?/td> 288K
代理商: 935265437112
Philips Semiconductors
Preliminary data
P89C51RB2/P89C51RC2/
P89C51RD2
80C51 8-bit Flash microcontroller family
16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM
2001 Jun 27
29
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 26. PCA Watchdog Timer Initialization Code
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