Aaeon SBC-357 Manual page 72

Following is an example of programming 1 sec period for
watchdog timer in assembly language. When timer times out, is
will generate system reset.
IO_Delay MACRO
Open_Chip MACRO
Close_Chip MACRO
Write_To_Chip PROC
;;Input: ah - Data
;;
64 SBC-357 User Manual
jcxz $+2
jcxz $+2
ENDM
push ax
mov al,013h
out 22h,al
IO_Delay
mov al,0c5h
out 23h,al
IO_Delay
pop ax
ENDM
push ax
mov al,13h
out 22h,al
IO_Dealy
mov al,0
out 23h,al
IO_Delay
pop ax
ENDM
al - Index#
cli
Open_Chip
out 22h,al
IO_Delay
xchg ah,al
out 23H,AL
IO_Delay
Close_Chip
sti
ret
ENDP