User`s manual

132
A
Watchdog Timer
Appendix A - Watchdog Timer
Watchdog Timer
The following parameters are references for setting the time interval
of the Watchdog Timer function. The system will regularly be “cleared”
according to the set time interval. If the system hangs or fails to
function, it will also reset according to the time interval so that your
system will continue to operate.
.model small
.386
;-------------------
;Port defination
;-------------------
SuperIo_CFG_Port EQU 2Eh ;Super I/O Config port. (2Eh/4Eh)
SuperIo_DAT_Port EQU SuperIo_CFG_Port + 1
WDT_Counter EQU 10 ; 1 to 255 (Sec./Min), 0 means
disabled
mSuperio_Enter_Config Macro
mov dx, SuperIo_CFG_Port
mov al, 87h
out dx, al
NEWIODELAY
out dx, al
endM
mSuperio_Exit_Config Macro
mov dx, SuperIo_CFG_Port
mov al, 0AAh
out dx, al
endM