AXIOMTEK tBOX500-510-FL Series, User Manual

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tBOX500-510-FL Series U
ser’s Manual
Watchdog Timer
39
APPENDIX A
WATCHDOG TIMER
What is Watchdog Timer
The integrated W atchdog Timer can be set up by programming . There are 1~255
levels available. After initializing W atchdog Timer by setting a countdown value, the
countdown of the value will start automatically when W atchdog Timer is enabled.
Watchdog Timer needs to be reset periodically or disabled, otherwise the system
will reboot when the value of the timer has reached zero.
How to Use the Watchdog Timer
(The following is an example of enabling configuration using a debug tool.)
Enable WDT

Enable configuration:
O 2E 87 ; Un-lock super I/O
O 2E 87

Select logic device:
O 2E 07
O 2F 07

WDT device enable:
O 2E 30
O 2F 01

Activate WDT:
O 2E F0
O 2F 80

Set base timer:
O 2E F6
O 2F M ;
M = time value
00h~FFh: Time-out disable~ Time-out occurs
after 255 seconds when N =71h.
Set Second or Minute :
O 2E F5
O 2F N ;
N =71h or 79h
N =71h, the time base is set to second.