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Appendix 1: Watchdog Timer
A watchdog timer is a hardware component designed to automatically monitor and address system
malfunctions by resetting the processor if issues arise. It operates on a countdown mechanism, starting from a
predetermined value set by the software, and decreasing to zero. The software routinely resets this counter to
prevent it from reaching zero. However, if the counter does hit zero, indicating the software has failed to reset
it, the system assumes a software failure. Consequently, it triggers the processor's reset signal, effectively
rebooting the processor as though a manual power reset was performed by an operator.
To download sample watchdog code, please refer to our official website at www.lannerinc.com.
Reset
Watchdog Timer
Processor
Restart
Clock
37
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