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Industrial Communication Platform
Appendix 1: Watchdog Timer
A watchdog timer is a piece of hardware that can be used to automatically detect system
anomalies and reset the processor in case there are any problems. Generally speaking, a
watchdog timer is based on a counter that counts down from an initial value to zero. The software
selects the counter's initial value and periodically restarts it. Should the counter reach zero before
the software restarts it, the software is presumed to be malfunctioning
and the processor's reset signal is asserted. Thus, the processor will be restarted as if a human
operator had cycled the power.
For sample watchdog code, see watchdog folder on the Driver and Manual CD
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