#include<avr/io.h>

int main(void)
{
   unsigned char i,j,k;
   unsigned char led;
   
   DDRB = 0xFF;   //Port B Output
   while(1)
   {
      if (led)
	 PORTB |= 0x01;
      else
	 PORTB &= 0xFE;
      
      led =!led;
      
      for(i=255;i>0;i--)
	 for(j=255;j>0;j--)
	   k++;
   }  
      
   return 0;
}