[proteus simulation] 8-bit port detection 8 independent keys

【Proteus Simulation 】8 Bit port detection 8 Independent buttons

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• Proteus Simulation
  

Sample code

/* Main.c file generated by New Project wizard * * Created:  Wednesday  6 month  29 2022 * Processor: AT89C51 * Compiler: Keil for 8051 */
/*-----------------------------------------------  name ： Single independent key input control in turn   Content ： For example, the input data form of calculator is the same   From left to right   Use the whole port scan to read the key value  ------------------------------------------------*/
#include<reg52.h> // Include header file , In general, there is no need to change , The header file contains the definition of special function registers