Appendix
WDT & GPIO
45
Appendix
WDT & GPIO
This
appendix
provides
the
sample
codes
of
WDT
(Watch
Dog
Timer)
and
GPIO
(General
Purpose
Input/
Output).
WDT Sample Code
SIO_INDEX_Port
equ 04Eh
SIO_DATA_Port
equ 04Fh
SIO_UnLock_Value
equ 087h
SIO_Lock_Value
equ 0AAh
WatchDog_LDN
equ 007h
WDT_UNIT
equ 60h
;
60h=second,
68h=minute,
40h=Disabled
Watchdog
timer
WDT_Timer
equ 30
;ex. 30 seconds
Sample code:
;Enable config mode
mov
dx, SIO_INDEX_Port
mov
al, SIO_UnLock_Value
out
dx, al
jmp
short $+2
;Io_delay
jmp
short $+2
;Io_delay
out
dx, al
;Change to WDT
mov
dx, SIO_INDEX_Port
mov
al, 07h
out
dx, al
mov
dx, SIO_DATA_Port
mov
al, WatchDog_LDN
out
dx, al
;Acive WDT
mov
dx, SIO_INDEX_Port
mov
al, 30h
out
dx, al
mov
dx, SIO_DATA_Port
in
al, dx
or
al, 01h
