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Chapter 4: WDT&GPIO
4.1 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
;Active WDT
mov dx, SIO_INDEX_Port
mov al, 30h
out dx, al
mov dx, SIO_DATA_Port
in al, dx
or al, 01h
out dx, al
