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71 Appendix A
A.2 Watchdog programming
Bellow is a sample of programming code for controlling the Watchdog
Timer function.
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Enter the extended function mode ,interruptible double-write |
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MOV DX,2EH
MOV AL,87H
OUT DX,AL
OUT DX,AL
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Configurate logical device 8, configuration register CRF6 |
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MOV DX,2EH
MOV AL,07H ; point to Logical Device Number Reg.
OUT DX,AL
MOV DX,2FH
MOV AL,08H ; select logical device 8
OUT DX,AL ;
MOV DX,2EH
MOV AL,30H ;Set watch dog activate or inactivate
OUT DX,AL
MOV DX,2FH
MOV AL,01H ; 01:activate 00:inactivate
OUT DX,AL ;
MOV DX,2EH
MOV AL,F5H ; Setting counter unit is second
OUT DX,AL
MOV DX,2FH
MOV AL,00H
OUT DX,AL;