/* Unused pins set as input pull up*/
        DDRB  &= 0xE0;
        DDRC &= 0xC9;
        DDRD &= 0x03;
        DDRE &= 0xF3;

        PORTB |= ~(0xE0);
        PORTC |= ~(0xC9);
        PORTD |= ~(0x03);
        PORTE |= ~(0xF3);