User`s manual

28 ICOP Embedded 386SX PC/104 AIO CPU Module User's Manual

readchip endp

writechip proc

out 22h, al

nop

xchg ah, al

out 23h, al

nop

xchg ah, al

ret

writechip endp

end main

Reset watchdog timer

Resets the watchdog timer periodically to prevent timeout.

mov ax, 0c513h ; Unlock configuration

; register

call writechip

mov ax, 03C3Ch ; Reset watchdog timer

; counter

call readchip

or al, 00100000b ; The counter is reset at

xchg ah, al ; out 23h, al

call writechip

mov ax, 00013h ; Lock configuration

; register

call writechip

(the above code uses readchip and writechip procedures)