#include <reg51.h>
void MSDelay(unsigned int);
void main(void)
  {
    unsigned char mybyte;
    P1=0xFF;      		
    while(1)
      { 
        mybyte=P1;  		
        MSDelay(500);
        P2=mybyte;  		
      }
  }
void MSDelay(unsigned int itime)
  {
    unsigned int i, j;
    for(i=0;i<itime;i++)
      for(j=0;j<1275;j++);
  }