我这个程序是电脑向单片机发一组数据,用数码管进行显示,跟你的电路不一样,

你看着自己改下,
#include <AT89X52.H>
#include<stdio.h>

unsigned char DisTable[]={0,0,0,0,0,0,0,0};
unsigned char code DuanTable[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,
0xF8,0x80,0x90,0x88,0x83,0xc6,0xa1,0xb0,0x8e};
unsigned char code WeiTable[]={
0x7f,0xbf,0xdf,0xef,0xf7,0xfb,0xfd,0xfe
};
unsigned char a,b;
void DisPlay();
void CloseLed();
void receive();
void KeyScan();
void delay(unsigned int m);
void main()
{
    TMOD = 0x20;
    SCON = 0x50;
    TH1 = 0xFD;
    TL1 = TH1;
    PCON = 0x00;
    EA = 1;
    ES = 1;
    TR1 = 1;
  while(1)
  {
    DisPlay();
    KeyScan();
  }
}
void DisPlay()
{
  if(a==8)
  {
    a=0;
  }
  CloseLed();
  P2=WeiTable[a];
  P0=DuanTable[DisTable[a]];
  a++;
  delay(10);
}
void delay(unsigned int m)
{
  while(m--);
}
void CloseLed()
{
  P0=0xff;
}
void receive()interrupt 4
{
  if(RI)
    {
       DisTable[7]=DisTable[6];
       DisTable[6]=DisTable[5];
       DisTable[5]=DisTable[4];
       DisTable[4]=DisTable[3];
       DisTable[3]=DisTable[2];
       DisTable[2]=DisTable[1];   
       DisTable[1]=DisTable[0];
       DisTable[0]=SBUF;
       RI=0;
     }   
}
void KeyScan()
{
  if(P1_4==0)
  {
      SBUF='A';
      while(!TI);
      TI = 0;
  }
}