There are usually two basic forms o

There are usually two basic forms of reset operation: power on automatic reset and switch reset. When the capacitor is energized, the voltage at both ends of the capacitor shall not change suddenly. At this point, the negative end of the capacitor is reset and all voltage is applied to the resistor. The reset input is high level and the chip is reset. Then + 5V power supply is used to charge the capacitor, and the voltage gradually reduces the resistance until the resistance is about 0. When the reset button is not pressed, the circuit is reset by electricity. After the chip works normally, press this key to turn the rst pin to high level to achieve the effect of manual reset.