AXIOMTEK EBOX800-841-FL Series, User Manual

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eBOX800-841-FL Series u
ser’s Manual
Watchdog Timer
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APPENDIX A
WATCHDOG TIMER
About Watchdog Timer
Software stability is major issue in most applications. Some embedded systems are not
watched by human for 24 hours. It is usually too slow to wait for someone to reboot when
computer hangs. The systems need to be able to reset automatically when things go wrong.
The watchdog timer gives us solutions in this regard.
The watchdog timer is a counter that triggers a system to reset when it counts down to zero
from a preset value. The software starts the counter with an initial value and must reset it
periodically. If the counter ever reaches zero, it means the software has crashed, the system
will reboot.