#include <REGX51.H>


void Delay(unsigned int t)
{
  while(t)t--;
}

void main(void)
{
  unsigned char Count;

  TMOD=0x05;
  TH0=0xFF;
  TL0=0xFF;
  TR0=1;

  while(1)
    {
      if(TF0==1)
        {          
          Count++;
          P1=~Count;
          Delay(5000);
          TH0=0xFF;
          TL0=0xFF;
          TF0=0;
        }
    }
}