102 SBC-558 User Manual
Example
Following is an example of programming 32 sec period for watch-
dog timer in assembly language. When timer times out, it will
generate signal of system reset.
CONFIG_PORT
dw
3f0h
DATA_PORT
dw
3f1h
SetWatchDog_Time PROC
push bx
push cx
push dx
mov bl,7
;; Select logical device number 7
mov ax,0130h
;; write 01h to register 30h to
activate
;; timer
call
W977Write ;; mov bl,8
;; Select logical device number 8
mov ax,01f2h
;; write time-out value (01h) to
register
;; F2h
call
W977Write ;; set time-out value to 32 sec
pop
dx
pop
cx
pop
bx
mov
ah,4ch
int
21h
ret
SetWatchDog_Time ENDP
Содержание SBC-558
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