Description: Watchdog, called watchdog timer, a timer circuit, generally have an input, called feed the dog, an output to the MCU s RST terminal, MCU normal work time, every time one end of the output a signal to feed the dog end to WDT clear, if not feed the dog more than the stipulated time, (usually when Runaway), WDT time over, went back to give a reset signal to MCU, MCU is reset. to prevent the MCU crash. watchdog role program is to prevent infinite loop occurs, or Runaway
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