#include <avr/io.h>
#include <util/delay.h>
#include <avr/io.h>

int main(void){

  DDRA = 0b10000000;

  while(1){

    PORTA = 0b10000000;
    _delay_ms(1000);
    PORTA = 0b00000000;
    _delay_ms(1000);

  }
}