IBM PCM-6890B, All-in-One FC/Socket 370 Celeron manual Dataport dw 3f1h

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

104 PCM-6890B User Manual