P1口做输出口，接八只发光二极管，编写程序，使发光二极管循环点亮。

P1口做输入口，接八个扭子开关，以实验机上74LS273做输出口，编写程序读取开关状态，将此状态，在发光二极管上显示出来。

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P1 port as the output port, then eight light-emitting diodes, programming, so that the light-emitting diode light cycle.

P1 port as an input port, then eight Toggle Switch, experimental machines do 74LS273 output port, write a program to read the switch status, this status is displayed on the light emitting diodes.