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A.1.3
Example Program
;-----------------------------------------------------------
1.
Enable watchdog timer and set 10 sec. as timeout interval
;-----------------------------------------------------------
Mov dx,A65h ; Select register 65h, watchdog timer I/O port address 680h+ register
shifts 65h
Mov al,80h ; Set second as counting unit
Out dx,al
Mov dx,A66h ; Select register 66h, watchdog timer I/O port address 680h+ register
shift 66h
Mov al,10 ; Set timeout interval as 10 seconds and start counting
Out dx,al
;-----------------------------------------------------------
2.
Enable watchdog timer and set 5 min. as timeout interval
;-----------------------------------------------------------
Mov dx,A65h ; Select register 65h, watchdog timer I/O port address 680h+ register
shifts 65h
Mov al,00h ; Set minute as counting unit
Out dx,al
680h
Mov dx,A66h ; Select register 66h, watchdog timer I/O port address 680h+ register
shifts 66h
Mov al,5 ;Set timeout interval as 5 minutes and start counting
Out dx,al
;-----------------------------------------------------------
3.
Enable watchdog timer to be reset by mouse
;-----------------------------------------------------------
Mov dx,A67h ; Select register 67h, watchdog timer I/O port address 680h+ register
shifts 67h
In al,dx
Or al,4h
; Enable watchdog timer to be reset by mouse
Out dx,al
;-----------------------------------------------------------
4.
Enable watchdog timer to be reset by keyboard
;-----------------------------------------------------------
Mov dx,A67h ; Select register 67h, watchdog timer I/O port address 680h+ register
shifts 67h
In al,dx
Or al,2h
; Enable watchdog timer to be reset by keyboard
Out dx,al
;-----------------------------------------------------------
5.
Generate a time-out signal without timer counting
;-----------------------------------------------------------
Mov dx,A68h ; Select register 68h, watchdog timer I/O port address 680h+ register
shifts 68h
In al,dx
Or al,4h
; Generate a time-out signal
Out dx,al
;-----------------------------------------------------------
57
MIC-7420 User Manual
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