The pulse generation circuit is composed of CD4060 and 32.768Hz quartz crystal oscillator to generate 4Hz pulse source. The 74LS293 counter counts the 4Hz pulse source, and its output terminal Q is connected to the reset terminal RESET of the single-chip microcomputer. A certain I/O terminal of the single-chip microcomputer is connected to the clear terminal R of 74LS293. The program outputs a narrow pulse from low to high and then from high to low within 1.5 seconds. The output terminal Q is always at a low level, otherwise it will output a high level. TTL watchdog circuit :
Reference address：TTL watchdog circuit
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