A watchdog, also known as a watchdog timer, is a timer circuit. It usually has one input, called kicking the dog or servicing the dog, and one output to the RST terminal of the MCU. When the MCU is working normally, it outputs a signal to the kicking dog terminal at regular intervals to clear the WDT. If the dog is not fed for a specified period of time (usually when the program runs wild), the WDT timing is exceeded and a reset signal is given to the MCU to reset the MCU and prevent the MCU from crashing. The function of the watchdog is to prevent the program from entering an infinite loop or running wild.
Working principle: After the system is running, the watchdog counter is started and the watchdog begins to count automatically. If the watchdog is not cleared after a certain period of time, the watchdog counter will overflow and cause a watchdog interrupt, causing the system to reset. Therefore, when using a chip with a watchdog, pay attention to clearing the watchdog.
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