What is watchdog timer?
Watchdog timer is hardware circuitary tightly integrated into embedded systems’ CPU to have a watch on embedded system’s working. It has ability to detect if embedded system is entered into a hanged state. It then resets the embedded system so that it doesn’t remain in hanged state indefinately. Watchdog timer is generally used in embedded systems where their is no human intervention present to reset it when system hangs. As its name suggests watchdog timer is a timer circuitary which keeps on counting and expires until reset. Embedded system software is expected to restart the timer regularly to prevent it from expiring under normal conditions. When systems hangs the timer is not restarted and it expires to give an indication to the system to restart.
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