Advantech AIMB-258 User Manual page 70

;-----------------------------------------------------------
Dec dx ; lock W83627UHG
Mov al,0aah
Out dx,al
5. Generate a time-out signal without timer counting
;-----------------------------------------------------------
Mov dx,2eh ; unlock W83627UHG
Mov al,87h
Out dx,al
Out dx,al
;-----------------------------------------------------------
Mov al,07h ; Select registers of watchdog timer
Out dx,al
Inc dx
Mov al,08h
Out dx,al
;-----------------------------------------------------------
Dec dx ; Enable the function of watchdog timer
Mov al,30h
Out dx,al
Inc dx
Mov al,01h
Out dx,al
;-----------------------------------------------------------
Dec dx ; Generate a time-out signal
Mov al,0f7h
Out dx,al ;Write 1 to bit 5 of F7 register
Inc dx
In al,dx
Or al,20h
Out dx,al
;-----------------------------------------------------------
Dec dx ; lock W83627UHG
Mov al,0aah
Out dx,al
AIMB-258 User Manual 62