P1口作输出口，接八只发光二极管，编写程序，使发光二极管循环点亮。P1.0，P1.1作为输入口接两个拨动开关，P1.2，P1.3作输出口接两个发光二极管，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。-P1 port as an output port, then eight light-emitting diodes, programming, making light-emitting diode light cycle. P1.0, P1.1 as an input port co