#include<reg51.h>
unsigned char dis_buf[8]={0x7e,0x7e,0x00,0x3c,0x3c,0x00,0xff,0xff};
void main(void)
{  unsigned char i,j;
  while(1)
  { P2=0;
    P0=0XFE;
	for(i=0;i<8;i++)
    {
	  P2=dis_buf[i];
	  for(j=0;j<200;j++)
	  {}
	  P2=0;
	  P0=(P0<<1)|0X01;
    }
   }
}