原理图：

#include <reg52.h>sbit dula=P2^6;//段选信号
sbit wela=P2^7;//位选信号unsigned char num;//数码管显示的数字0~funsigned char code table[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71};//定义数码管显示内容0~f的数组void delay(unsigned int z);void main()
{wela=1;P0=0xc0;//选中所有数码管wela=0;while(1){for(num=0;num<16;num++){dula=1;P0=table[num];dula=0;delay(1000);}}
}
void delay(unsigned int z)//延时程序
{unsigned int x,y;for(x=z;x>0;x--)for(y=110;y>0;y--);
}