DFI CA331-NR - Manual (Page 124)

124
A
Watchdog Timer
Appendix A - Watchdog Sample Code
;Software programming example:
;----------------------------------------------------------------
;(1) Enter Superio Configuration mode
;----------------------------------------------------------------
MOV
DX,4EH
MOV AL,87H
OUT DX,AL
OUT DX,AL
;--------------------------------------------------------------------------------
;(2) Configuration Logical Device 8, register CRF5/CRF6/CRF7
; (WDT count mode / count value / control mode)
;--------------------------------------------------------------------------------
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,F5H ;Select CRF5
OUT DX,AL
MOV DX,4FH
IN AL,DX
OR AL,08H ;Set CRF5[Bit:3]=1, WDT count mode=Minute mode
OUT DX,AL
MOV DX,4EH
MOV AL,F6H ;Select CRF6
OUT DX,AL
MOV DX,4FH
MOV AL,02H ;Set CRF6 value=02 => Watch Dog Timer=2 (unit:Min)
OUT DX,AL
MOV DX,4EH
MOV AL,F7H ;Select CRF7
OUT DX,AL