将输入点电路做成矩阵电路,利用高速二极管反向截止阻断对其他电路的影响,以及使用优先编码器将输入编码,单片机接受编码器输出并将输出信号作为中断触发,通过单片机控制程序计算输入编码,最终获得输入点的绝对位置,实现了8位IO对255个点的编码。适合用于单一阶跃输入信号的输入点编码。本设应用范围广、容易理解、使用方便。 The input circuit made of matrix circuit, the use of high-speed diode reverse blocking the impact on other circuits, and the use of priority encoder input encoding, the microcontroller accepts the encoder output and the output signal as an interrupt trigger, calculated by the microcontroller control program Enter the encoding, the final access to the absolute position of the input point, to achieve the 8-bit IO 255 ​​encoding points. Suitable for use with input points for single step input signals. The set of wide range of applications, easy to understand, easy to use.