MCU is A micro control unit, also known as a single chip microcomputer or single chip microcomputer, is the central processor CPU frequency and specifications to do appropriate reduction, and memory, counter, USB, A\/D conversion, DMA and other peripheral interfaces, and even LCD driver circuit are integrated on a single chip to form a chip-level computer, for different applications to do different combination control. mcu can be divided into general purpose and special purpose according to the purpose. Generic means that all developable resources are provided to the user, and specialized means that the hardware and instructions are designed according to a specific purpose, such as a printer controller.