數碼管動態顯示——鎖存器

1、電路設計：

 

 LE接P3.0來實現段選或位選，OE接地，當LE為高電平的時候，鎖存器為通路。

2、程序設計：

#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、運行結果：

 

 以前需要兩個端口來實現的顯示功能，現在只需要一個P0口就可以實現數碼管的顯示，大大減少了端口的占用，電路的設計更加合理。