#define F_CPU 16000000UL

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

#define set_bit(Y,bit_x) (Y |= (1<<bit_x))
#define clr_bit(Y,bit_x) (Y &= ~(1<<bit_x))
#define tst_bit(Y,bit_x) (Y & (1<<bit_x))
#define cpl_bit(Y,bit_x) (Y ^= (1<<bit_x))


#define LED PB5

int main( )
{
	DDRB = 0xFF; //configura todos os pinos do PORTB como saídas
	while(1) {
		set_bit(PORTB, LED); //liga LED
		_delay_ms(200); //atraso de 200 ms
		clr_bit(PORTB, LED); //desliga LED
		_delay_ms(200); //atraso de 200 ms
	}
}