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參數資料
型號: W79E201A16FN
廠商: WINBOND ELECTRONICS CORP
元件分類: 微控制器/微處理器
英文描述: 8-BIT MICROCONTROLLER
中文描述: 8-BIT, FLASH, 16 MHz, MICROCONTROLLER, PQFP44
封裝: ROHS COMPLIANT, QFP-44
文件頁數: 50/87頁
文件大小: 818K
代理商: W79E201A16FN
W79E201
- 50 -
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 clocks 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
; Test if CPU need to reset.
jmp
$
; Wait to reset
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
相關PDF資料
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相關代理商/技術參數
參數描述
W79E201A16LN 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER
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