UART（Universal Asynchronous Receiver Transmitter，通用异步收发器）是广泛使用的异步串行数据通信协议。下面首先介绍UART硬件接口及电平转换电路，分析UART的传输时序并利用Verilog HDL语言进行建模与仿真，最后通过开发板与PC相连进行RS-232通信来测试UART收发器的正确性。-UART (Universal Asynchronous Receiver Transmitter, Universal Asynchronous Receiver Transmitter) is a widely used asynchronous serial data communication protocol. Below first introduced UART hardware interface and level conversion circuit, the UART transmit timing analysis and use of Verilog HDL language modeling and simulation, and finally the development board connected to the PC via RS-232 communications conducted to test the correctness of UART transceiver.