Advantech ARK-1120, User Manual

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ARK-1120 User Manual 42
A.1 Watchdog Timer Sample Code
Watchdog function:
;The SCH3114 Runtime base I/O address is A00h
;Setting WatchDog time value location at offset 66h
;If set value "0", it is mean disable WatchDog function.
Superio_GPIO_Port = A00h
mov dx,Superio_GPI 66h
mov al,00h
out dx,al
.model small
.486p
.stack 256
.data
SCH3114_IO EQU A00h
.code
org 100h
.STARTup
;====================================================
;47H
;enable WDT function bit [0]=0Ch
;====================================================
mov dx,SCH3 47h
mov al,0Ch
out dx,al
;====================================================
;65H
;bit [1:0]=Reserved
;bit [6:2]Reserve=00000
;bit [7] WDT time-out Value Units Select
;Minutes=0 (default) Seconds=1
;====================================================
mov dx,SCH3 65h ;
mov al,080h
out dx,al
;====================================================
;66H
;WDT timer time-out value
;bit[7:0]=0~255
;====================================================
mov dx,SCH3 66h
mov al,01h
out dx,al
;====================================================
;bit[0] status bit R/W
;WD timeout occurred =1