This system adopts the manual reset function, this circuit is shown in Figure 3-4. When the system is turned on, the RC circuit begins to charge because the capacitor voltage cannot be abrupt, so the RST terminal potential is close to Vcc, then the RST terminal potential will gradually decrease as the capacitor charges. If the positive pulse time displayed on the RST terminal is maintained above 10 ms, the microcontroller can be effectively reset..