单片机是将运算器、存储器、定时器、模数转换器和串行通信接口等集成在一个芯片上的小型计算机系统，它可以被嵌入到各种自动控制器和智能电子产品中。

Microcontroller is a small computer system that integrates ALU, memory, timer, ADC, UART, etc in one chip. it can be embedded into many kinds of controllers and intelligent electronic products.

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