DFI BT551 - Appendix A: Watchdog Sample Code; Watchdog Timer Programming Example

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Appendix A Watchdog Sample Code
Appendix A
Appendix A - Watchdog Sample Code
;Software programming example:
;---------------------------------------------
;(1) Enter Super IO Confi guration mode
;---------------------------------------------
MOV DX,4EH
MOV AL,87H
OUT DX,AL
OUT DX,AL
;-------------------------------------------------------------------------------------------
;(2) Confi guration Logical Device 8, register CRF0/CRF1 (WDT Control/WDT
timer)
;-------------------------------------------------------------------------------------------
MOV DX,4EH
MOV AL,07H ;Ready to Program Logical Device
OUT DX,AL
MOV DX,4FH
MOV AL,08H ;Select Logical Device 8
OUT DX,AL
MOV DX,4EH
MOV AL, F1H ;Select watchdog timer register
OUT DX,AL
MOV DX,4FH
MOV AL,10H ;Set watchdog timer value
OUT DX,AL
MOV DX,4EH
MOV AL, F0H ;Select watchdog Control Register
OUT DX,AL
MOV DX,4FH
MOV AL,02H ;Set Watchdog Control Value
OUT DX,AL
;----------------------------------------------------------------
;(1) Exit extended function mode
;----------------------------------------------------------------
MOV DX,4EH
MOV AL,AAH
OUT DX,AL