数控流水灯，键进行内容选择，16个按键分别为0~F，按下一个按键，在主机板子上的数码管上显示相应的值，并通过异步串行通信的方式将按键内容发给从机。异步串行通信的要求：不能使用芯片自带的串口，要求用除P3.0和P3.1外的任何IO管脚进行模拟发送，速度是2400波特率。-CNC water lights, choice of content keys, 16 keys are 0 ~ F, press a button on the motherboard LED sub display the corresponding value, and the way through the asynchronous serial communication sent from the key content machine. Asynchronous serial communication requirements: can not use the serial port chip built, except P3.0 and P3.1 require external IO pins to simulate any transmission, speed is 2400 baud.