IC, that is, integrated circuit MCU, should also be a class of IC, module, in order to achieve a certain function, others have used some components assembled a semi-finished product. It can be used to supplement the MCU(Micro Control Unit) Chinese name called micro control unit, also known as a Single Chip Microcomputer (Single Chip Microcomputer) or single chip microcomputer, refers to the emergence and development of large-scale integrated circuits, The computer's CPU, RAM, ROM, timing counter and a variety of I\/O interfaces are integrated on a chip to form a chip-level computer