数码管动态显示——锁存器

1、电路设计：

 LE接P3.0来实现段选或位选，OE接地，当LE为高电平的时候，锁存器为通路。

2、程序设计：

#include<reg52.h>
sbit P3_0 = P3^0;
code unsigned char seven_seg[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0xbf,0xff};     
void delay(unsigned int x){
    while(x--);
}
int main(){
    while(1){
      P3_0 = 0;P0 = 0x01;P3_0 = 1;P3_0 = 0;P0 = seven_seg[0];delay(150);P0=0xff;
        P3_0 = 0;P0 = 0x02;P3_0 = 1;P3_0 = 0;P0 = seven_seg[1];delay(150);P0=0xff;        
        P3_0 = 0;P0 = 0x04;P3_0 = 1;P3_0 = 0;P0 = seven_seg[2];delay(150);P0=0xff;    
        P3_0 = 0;P0 = 0x08;P3_0 = 1;P3_0 = 0;P0 = seven_seg[3];delay(150);P0=0xff;    
        P3_0 = 0;P0 = 0x10;P3_0 = 1;P3_0 = 0;P0 = seven_seg[4];delay(150);P0=0xff;        
        P3_0 = 0;P0 = 0x20;P3_0 = 1;P3_0 = 0;P0 = seven_seg[5];delay(150);P0=0xff;
        P3_0 = 0;P0 = 0x40;P3_0 = 1;P3_0 = 0;P0 = seven_seg[6];delay(150);P0=0xff;        
        P3_0 = 0;P0 = 0x80;P3_0 = 1;P3_0 = 0;P0 = seven_seg[7];delay(150);P0=0xff;
    }
}

3、运行结果：

 以前需要两个端口来实现的显示功能，现在只需要一个P0口就可以实现数码管的显示，大大减少了端口的占用，电路的设计更加合理。