Circuit, method and device for waking up main MCU (micro control unit)

The invention discloses a circuit, a method and a device for waking up a main MCU (micro control unit). With the adoption of the circuit, the method and the device for waking up the main MCU, the main MCU of equipment in deep sleep can wake up in time for data receiving and transmitting. The method comprises steps as follows: the main MCU is configured to be in a deep sleep state, and a peripheral processing chip and a peripheral interface chip are configured to be in a normal working state; the data quantity of data sent by the peripheral processing chip to the peripheral interface chip is monitored; when the data quantity exceeds a threshold value, a wake-up signal is sent to the main MCU. According to the technical scheme, the main MCU of equipment in deep sleep can wake up in time for data receiving and transmitting.