Proteus仿真实例，在Proteus下仿真uart，非常不错，值得下载。-Proteus simulation example, in the Proteus simulation under the uart, very good, it is worth downloading.

ARM的P0.0口接LED，串口接Proteus的虚拟终端。每隔一段时间改变一次LED的状态，并且在串口上输出LED的当前状态。-LED contact the port P0.0,and uart port contact the Proteus virture terminal . alter the LED state every a time,and output the curent state to the termial.