Table of Contents
Advertisement
Connector CN4 Orientation
HDD LED
ATX Power
Button
Reset
Button
3.18 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 restart
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
MOV
OUT
OUT
MOV
MOV
OUT
MOV
MOV
OUT
MOV
MOV
OUT
MOV
MOV
OUT
MOV
MOV
OUT
MOV
MOV
OUT
MOV
1
2
3
4
5
6
7
8
9
10
11
12
DX, 2EH
AL, 87H
DX, AL
DX, AL
DX, 2EH
AL, 07H
DX, AL
DX, 2FH
AL, 08H
DX, AL
DX, 2EH
AL, F5H
DX, AL
;select CRF0
DX, 2FH
AL, 80H
DX, AL
DX, 2EH
AL, F7H
DX, AL
DX, 2FH
AL, 00H
DX, AL
DX, 2EH
Speaker
PWR LED
21
Advertisement
Table of Contents
