单片机（Microcontrollers）是一种集成电路芯片，是采用超大规模集成电路技术把具有数据处理能力的中央处理器CPU、随机存储器RAM、只读存储器ROM、多种I/O口和中断系统、定时器/计数器等功能（可能还包括显示驱动电路、脉宽调制电路、模拟多路转换器、A/D转换器等电路）集成到一块硅片上构成的一个小而完善的微型计算机系统，在工业控制领域广泛应用。从上世纪80年代，由当时的4位、8位单片机，发展到现在的300M的高速单片机。(Keyboard display program writing
MCU (Microcontrollers) is an integrated circuit chip is the use of large scale integrated circuit technology to a data processing capability of CPU CPU, RAM ram, Rom ROM, a variety of I/O port and interrupt system, timer / counter function (may also include a display drive circuit, pulse width modulation circuitanalog multiplexer the A/D converter circuit) integrated into a small and complete micro computer system composed of a piece of silicon, widely used in the field of industrial control. From the 80s of last century, the 4 - bit and 8 - bit singlechip developed to the present high speed MCU of 300M.)