多路开关状态指示



如图4.3.1所示，AT89S51单片机的P1.0－P1.3接四个发光二极管L1－L4，P1.4－P1.7接了四个开关K1－K4，编程将开关的状态反映到发光二极管上。（开关闭合，对应的灯亮，开关断开，对应的灯灭）。

-multiple switch state instructions shown in Figure 4.3.1. AT89S51 SCM P1.0 - P1.3 then four LED L1 - L4, P1.4 - P1.7 then switch the four K1 - K4, programming will switch the state to reflect on the light-emitting diode. (Closed switch, the corresponding lights, switches off, the lights corresponding to eliminate).