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65 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

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Configured 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;

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