【C51单片机期末复习整理系列】[五]自制抢答器4*4按键对应八位数码管显示

要求：4*4按键对应八位数码管显示

数码管电路图：

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4*4矩阵式键盘电路原理图：

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代码如下：

#include "reg52.h"
sbit oe = P1^3;
sbit le1 = P1^4;//传值
sbit le2 = P1^5;//片选
char code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};//共阴极的code
char code select[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};
//延时函数
void delay(unsigned int ms){
          unsigned int x,y;
          for(x=0;x