Advantech PCA-6743 User Manual page 61

Out dx, al
2. Enable watchdog timer and set 5 minutes as timeout interval
;-----------------------------------------------------------
Mov dx,2Eh; Unlock
Mov al, 87h
Out dx, al
Out dx, al
;-----------------------------------------------------------
Mov dx, 2Eh; Pin 77 Select as WDTO#
Mov al, 2Dh
Out dx, al
Inc dx
In al, dx
And al, not 00000001b
Out dx, al
;-----------------------------------------------------------
Mov dx,2Eh; Select Logical Device 8 of watchdog timer
Mov al, 07h
Out dx, al
Inc dx
Mov al, 08h
Out dx, al
;-----------------------------------------------------------
Mov dx, 2Eh; Enable the function of watchdog timer
Mov al, 30h
Out dx, al
Inc dx
Mov al, 01h
Out dx, al
;-----------------------------------------------------------
Mov dx, 2Eh; Set minutes as counting unit
Mov al, F5h
Out dx, al
Inc dx
In al, dx
Or al, 08h
Out dx, al
;-----------------------------------------------------------
Mov dx, 2Eh; Set timeout interval as 5 minutes and start counting
Mov al, F6h
Out dx, al
Inc dx
Mov al, 5
Out dx, al
;-----------------------------------------------------------
Mov dx, 2Eh; Lock W83627-DHG-P
Mov al, AAh
Out dx, al
PCA-6743 User Manual
W83627-DHG-P
52