Aaeon SBC-357, Manual

Page: 72 / 78

64 SBC-357 User Manual
Example
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
jcxz $+2
jcxz $+2
ENDM
Open_Chip MACRO
push ax
mov al,013h
out 22h,al
IO_Delay
mov
al,0c5h
out 23h,al
IO_Delay
pop
ax
ENDM
Close_Chip MACRO
push ax
mov al,13h
out 22h,al
IO_Dealy
mov
al,0
out 23h,al
IO_Delay
pop
ax
ENDM
Write_To_Chip PROC
;;Input: ah - Data
;;
al - Index#
cli
Open_Chip
out
22h,al
IO_Delay
xchg
ah,al
out 23H,AL
IO_Delay
Close_Chip
sti
ret
ENDP