Aaeon PFM-540I, Manual

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P C / 1 0 4 C P U M o d u l e P F M - 5 4 0 I R e v . B
Appendix A Programming the Watchdog Timer A-4
The following is a sample code to set WDT for 3 seconds.
;Runtime register I/O base address
SUPERIO_GPIO_PORT EQU 800h
.MODEL SMALL
.CODE
begin:
;enable WDT
mov dx, SUPERIO_GPI 47h
mov al, 0Ch
out dx, al
;WDT_TIME_OUT register
mov dx, SUPERIO_GPI 65h
mov al, 80h ;unit is second
out dx, al
;WDT_VAL register
mov dx, SUPERIO_GPI 66h
mov al, 03h ;3 seconds
out dx, al
;exit
mov ah,4ch
int 21h
END begin