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Appendix B Programming the Watchdog Timer

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

-----------------------------------------------------------------------------

Configured logical device 8, configuration register CRF6 |

-----------------------------------------------------------------------------

MOV DX,2EH

MOV AL,2BH

OUT DX,AL

MOV DX,2FH

IN AL,DX

AND AL.OEFH;Setbit 4=0 Pin 89=WDTO

OUT DX,AL

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;

MOV DX,2EH

MOV AL,F6H

OUT DX,AL

MOV DX,2FH

MOV AL,05H; Set 5 seconds

OUT DX,AL

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

; Exit extended function mode |

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

MOV DX,2EH

MOV AL,AAH

OUT DX,AL

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