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Contec SEH-9450-LAS Manual De Usuario

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6. Watch-Dog-Timer (WDT) Setting 
 
 
 
 
34 
SEH-9450-LAS 
MOV DX,2EH 
MOV AL,87H 
OUT DX,AL 
OUT DX,AL 
;----------------------------------- 
;Select logical device WDT(number 8) 
;----------------------------------- 
MOV DX,2EH 
MOV AL,07H 
OUT DX,AL 
MOV DX,2FH 
MOV AL,08H 
OUT DX,AL 
;----------------------------------- 
;Stop count down of WDT 
;----------------------------------- 
MOV DX,2EH 
MOV AL,F6H 
OUT DX,AL 
MOV DX,2FH 
;----------------------------------- 
;The data of 00H is stop WDT  
MOV AL,00H 
;----------------------------------- 
OUT DX,AL 
;----------------------------------- 
;Exit the extended function mode 
;----------------------------------- 
MOV DX,2EH 
MOV AL,AAH 
OUT DX,AL 
 
CAUTION
 
 
 
The timer’s intervals have a tolerance of 
±2 seconds.