MCU is short for Microcontroller Unit, Chinese called microcontroller, commonly known as microcontroller, is the CPU frequency and specifications to do appropriate reduction, and memory, counter, USB, A\/D conversion, UART, PLC, DMA and other peripheral interfaces, even LCD driver circuit are integrated on a single chip. Form a chip-level computer to do different combination controls for different applications, such as mobile phones, PC peripherals, remote controls, to automotive electronics, industrial stepper motors, robot arm control, etc., the MCU can be seen.