Dfi SR100-L20C Manuel d'utilisateur télécharger pdf (Page 136)

136

Watchdog Timer

Appendix B - 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

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

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Dfi SR100-L20C Manuel d'utilisateur Page 136