说明：  单片机的键盘和显示,8031单片机的P1口作为8个按键的输入端，构成独立式键盘。四个LED显示器通过四个串/并移位寄存器74LS164接口至8031的串行口，该串行口应工作在方式0发送状态下，RXD端送出要显示的段码数据，TXD则作为发送时钟来对显示数据进行移位操作。 自定义每个键的显示功能，当某一键按下时执行相应的服务子程序，在四个显示器上显示一定的内容。
(Single-chip microcomputer keyboard and display, the P1 port 8031 as a single-chip 8 input keys, constituting a separate keyboard. Four LED display through four strings/and 74LS164 shift register interface to the serial port 8031, the serial port mode 0 should work under send, RXD client sent the above code to display data, TXD clock as sent to show the data transfer operation. Customize the display for each button, when pressed a button to implement the service subroutine, shown in the four display some content.)