#include <reg51.h>

sbit dula=P2^6;        //段选信号的锁存器控制
sbit wela=P2^7;        //位选信号的锁存器控制

unsigned char code table[]= {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,
                             0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71
                            };
//0-F的码表
void delay(unsigned int i)
{
    unsigned int m,n;
    for(m=i; m>0; m--)
        for(n=90; n>0; n--);
}

void main()
{
    unsigned char num;
    while(1)
    {
        for(num=0; num<4; num++)
        {
            P0=table[num];
            dula=1;
            dula=0;

            P0=0xfe;       //选中第一个数码管
            wela=1;
            wela=0;
            delay(1000);
        }
    }
}