DFI SR100-L20C, User Manual

Page: 117 / 124

117
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.
;================ PROGRAM START ================
SIO_CON_PORT
EQU 2EH
SIO_DATA EQU 2FH
begin:
MOV
DX,SIO_CON_PORT ;SUPERIO ENTER CONFIG
MOV AL,87H
OUT DX,AL
OUT DX,AL
MOV DX,SIO_CON_PORT
MOV AL,2DH ;GPIO5 AND POWER CONTROL SIGNALS
MULTI-FUNCTION PIN SELECTION
OUT DX,AL ;BIT 0 PIN77 SELECT (0= WDTO#, 1=
GPIO50)
MOV DX,SIO_DATA
IN AL,DX
AND AL,0FEH ;SELECT PIN TO WATCH DOG
OUT DX,AL
MOV DX,SIO_CON_PORT
MOV AL,07H ;LOGIC DEVICE SLELCT
OUT DX,AL
MOV DX,SIO_DATA
MOV AL,08H ;SELECT DEVICE 8 (WATCH DOG)
OUT DX,AL
MOV DX,SIO_CON_PORT
MOV AL,030H ;ACTIVATE REGISTER
OUT DX,AL
MOV DX,SIO_DATA
OR AL,01H ;0= INACTIVATE, 1=ACTIVATE
OUT DX,AL