Appendix B Programming The Watchdog Timer - Advantech UNO-2170 User Manual

Appendix B Programming the Watchdog
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
;------------------------------------------
; Exit extended function mode |
;------------------------------------------
MOV DX,2EH
MOV AL,AAH OUT DX,AL
UNO-2170 User Manual
Timer
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