Appendix Awatchdog Timer; About Watchdog Timer - AXIOMTEK eBOX671-885-FL Series User Manual

eBOX671-885-FL Series User's Manual
APPENDIX A
WATCHDOG TIMER

About Watchdog Timer

Software stability is major issue in most application. 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 solution.
The watchdog timer is a counter that triggers a system reset when it counts down to zero from
a preset value. The software starts counter with an initial value and must reset it periodically. If
the counter ever reaches zero which means the software has crashed, the system will reboot.
Watchdog Timer Setting
55