Dfi HD330-H81 User Manual download pdf (Page 78)

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Appendix B Watchdog Sample Code

Appendix B

Appendix B - Watchdog Sample Code

;Software programming example:

;---------------------------------------------

;(1) Enter Super IO Conﬁ guration mode

;---------------------------------------------

MOV DX,4EH

MOV AL,87H

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

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Dfi HD330-H81 User Manual Page 78