This reset circuit is the capacitor connected to the power supply, the middle is RST, the resistance is grounded below, is a high level reset. Its working principle is: after the power is connected, the two ends of the capacitor are equivalent to a short circuit, the RST pin is high level, and then the power supply charges the capacitor through the resistor, the RST terminal voltage slowly drops, drops to a certain degree when it is low level, and the SCM starts to work normally.