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參數資料
型號: W79E648
廠商: WINBOND ELECTRONICS CORP
英文描述: Fast 8051 Compatible microcontroller with a redesigned Processor
中文描述: 快速8051兼容微控制器重新設計的處理器
文件頁數: 51/80頁
文件大小: 407K
代理商: W79E648
Preliminary W79E648
Publication Release Date: 05/31/2004
- 51 - Revision A1
Clock Control
WD1, WD0: CKCON.7, CKCON.6 - Watchdog Timer Mode select bits. These two bits select the time-
out interval for the watchdog timer. The reset time is 512 clock longer than the interrupt
time-out value.
The default Watchdog time-out is 2
17
clocks, which is the shortest time-out period. The EWT, WDIF
and RWT bits are protected by the Timed Access procedure. This prevents software from accidentally
enabling or disabling the watchdog timer. More importantly, it makes it highly improbable that errant
code can enable or disable the watchdog timer. Please refer as below demo program.
org 63h
mov TA,#AAH
mov TA,#55H
clr WDIF
jnb
execute_reset_flag,bypass_reset
jmp
$
bypass_reset:
mov
TA,#AAH
mov
TA,#55H
setb
RWT
reti
org 300h
start:
mov
ckcon,#01h
; select 2 ^ 17 timer
;
mov
ckcon,#61h
; select 2 ^ 20 timer
;
mov
ckcon,#81h ; select 2 ^ 23 timer
;
mov
ckcon,#c1h
; select 2 ^ 26 timer
mov TA,#aah
mov TA,#55h
mov WDCON,#00000011B
setb EWDI
setb ea
jmp $
; wait time out
; Test if CPU need to reset.
; Wait to reset
相關PDF資料
PDF描述
W79E802 8-BIT MICROCONTROLLER
W79E802A 8-BIT MICROCONTROLLER
W79E802ADG 8-BIT MICROCONTROLLER
W79E802ASG 8-BIT MICROCONTROLLER
W79E803 8-BIT MICROCONTROLLER
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