Ec Watchdog Timer Sample Code - Advantech ARK-3500 User Manual

A.1

EC Watchdog Timer Sample Code

EC_Command_Port = 0x29Ah
EC_Data_Port = 0x299h
Write EC HW ram = 0x89
Watch dog event flag = 0x57
Watchdog reset delay time = 0x5E
Reset event = 0x04
Start WDT function = 0x28
====================================================
.model small
.486p
.stack 256
.data
.code
org 100h
.STARTup
mov dx, EC_Command_Port
mov al,89h ; Write EC HW ram.
out dx,al
mov dx, EC_Data_Port
mov al, 5Fh ; Watchdog reset delay time low byte (5Eh is high byte) index, Timebase:
100ms
out dx,al
mov dx, EC_Data_Port
mov al, 64h ;Set 10 seconds delay time.
out dx,al
mov dx, EC_Command_Port
mov al,89h ; Write EC HW ram.
out dx,al
mov dx, EC_Data_Port
mov al, 57h ; Watch dog event flag.
out dx,al
mov dx, EC_Data_Port
mov al, 04h ; Reset event.
out dx,al
mov dx, EC_Command_Port
mov al,28h ; start WDT function. (Stop: 0x29, Reset: 0x2A)
out dx,al
.exit
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