Contec SPI-8451-LLVA User Manual

7. Watch-Dog-Timer (WDT) Setting 

 

 

 

SPI-8451-LLVA, SPI-8452-LLVA, SPI-8451-LVA 

73 

;------------------------------------------ 
;Exit the extended function mode 
;------------------------------------------ 
MOV DX,2EH 
MOV AL,AAH 
OUT DX,AL 
 
 
;================================ 
;<WDT START : counter set and a start > 
;================================ 
;--------------------------------------------- 
;Enter the extended function mode 
;--------------------------------------------- 
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 
;------------------------------------------------------ 
;Set time of WDT and start to count down 
;------------------------------------------------------ 
MOV DX,2EH 
MOV AL,F6H 
OUT DX,AL 
MOV DX,2FH 
;---------------------------------------------------------------------------------- 
;The data of an example is 15 seconds.(01H=1sec.- FFH=255sec.)   
MOV AL,0FH      ; 0FH = 15Sec. 
;----------------------------------------------------------------------------------- 
OUT DX,AL 
;----------------------------------- 
;Exit the extended function mode 
;----------------------------------- 
MOV DX,2EH 
MOV AL,AAH 
OUT DX,AL