/*
 * tutoriel.c
 *
 * Created: 29/01/2021 09:13:18
 * Author : yboujon1
 */ 

#include <avr/io.h>  // necessaire pour l'acces au reg IO

unsigned char a,b,x,y,z;

int main(void)
{
	DDRB = 0xFF;
	x = 0x6E;
	y = 0xA5;
	z = ~((x & 0xF0) | (y & 0x0F));
	PORTB = ~z;

    while (1) {
    }
}