HS-7002 datasheet(29/78 Pages) BOSER

29 / 78 page

3.20 Watchdog Timer

Once the Enable cycle is active, a Refresh cycle is requested before

the time-out period. This restarts counting of the WDT period. When

the time counting goes over the period preset of WDT, it will assume

that the program operation is abnormal. A System Reset signal will

re-start when such error happens.

The following sample programs show how to Enable, Disable and

Refresh the Watchdog Timer:

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

; Enter the WDT function mode, interruptible double-write

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

MOV

DX, 2EH

MOV

AL, 87H

OUT

DX, AL

OUT

DX, AL

MOV

DX, 2EH

MOV

AL, 07H

OUT

DX, AL

MOV

DX, 2FH

MOV

AL, 08H

OUT

DX, AL

MOV

DX, 2EH

MOV

AL, F5H

OUT

DX, AL

; select CRF0

MOV

DX, 2FH

MOV

AL, 80H

OUT

DX, AL

MOV

DX, 2EH

MOV

AL, F7H

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, 00H

; * 00H=Disabled

OUT

DX, AL

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

; Exit extended function mode

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

MOV

DX, 2EH

MOV

AL, AAH

OUT

DX, AL

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