Microsoft UNO-3074 user manual Appendix B Programming the Watchdog Timer

Appendix B Programming the Watchdog Timer

Below are samples of 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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Configured logical device 8, configuration register CRF6

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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

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; Exit extended function mode

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

MOV DX,2EH

MOV AL,AAH OUT DX,AL

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