#include<reg51.H>
#include<display.H>
unsigned char data buf[5],data_buf[20];
unsigned char data k;
main()
{ unsigned char i;
  TMOD=0x20;
  TH1=0xfd;
  TL1=0xfd;
  SCON=0x50;
  PCON=0x00;
  TR1=1;
while(1)
{  
   for(i=0;i<20;i++)
    {
     while(!RI);
	  RI=0;
	  data_buf[i]=SBUF;
	  if(data_buf[i]==0x0d)		//檢測輸入完了嗎？回車鍵
	   {
	   k=i;
	   break;
	   }
	  }
 for(i=0;i<k;i++)
   {
    SBUF=data_buf[i];
    while(!TI);            //等待
	TI=0;
	}
  buf[0]=0x00;
  buf[1]=data_buf[0]>>4;
  buf[2]=data_buf[0]&0x0f;
  buf[3]=data_buf[1]>>4;
  buf[4]=data_buf[1]&0x0f;
  for(i=0;i<250;i++)
  display(buf);
  }
}