Appendix B - Watchdog Sample Code - DFI TPC121 User Manual

Appendix B - Watchdog Sample Code

;Software programming example:
;---------------------------------------------
;(1) Enter Super IO Confi guration mode
;---------------------------------------------
MOV DX,2EH
MOV AL,87H
OUT DX,AL
OUT DX,AL
;-------------------------------------------------------------------------------------------
;(2) Confi guration Logical Device 7, register CRF5/CRF6 (WDT Control /WDT
timer)
;-------------------------------------------------------------------------------------------
MOV DX,2EH
MOV AL,07H ;Ready to Program Logical Device
OUT DX,AL
MOV DX,2FH
MOV AL,07H ;Select Logical Device 7
OUT DX,AL
MOV DX,2EH
MOV AL, F6H ;Select watchdog timer register
OUT DX,AL
MOV DX,2FH
MOV AL,10H ;Set watchdog timer value
OUT DX,AL
MOV DX,2EH
MOV AL, F5H ;Select watchdog Control Register
OUT DX,AL
MOV DX,2FH
MOV AL,61H ;Set Watchdog Control Value
OUT DX,AL
;----------------------------------------------------------------
;(1) Exit extended function mode
;----------------------------------------------------------------
MOV DX,2EH
MOV AL,AAH
OUT DX,AL
Appendix B Watchdog Sample Code
Appendix B
79
www.dfi .com