#define F_CPU 14745600UL

unsigned int BAUDR=F_CPU/57600UL/16UL-1;

DDRE=0b11110100; //PE0-RX, PE1-TX, PE2-!RE/DE

PORTE|=0b11110000;

UBRR0H = (unsigned char)(BAUDR>>8);
UBRR0L = (unsigned char)BAUDR;
        
UCSR0C=(1<<UCSZ00)|(1<<UCSZ01);
UCSR0B|=(1<<RXEN0)|(1<<RXCIE0);

void sendByte(char bb){
    cli();
    PORTE|=0b00000100;
    UCSR0B &= ~(1<<RXEN0);
    UCSR0B |= (1<<TXEN0);
    while(!(UCSR0A & (1<<UDRE0)));
    UDR0=bb;
    _delay_ms(5);
    PORTE&=~0b00000100;
    UCSR0B &= ~(1<<TXEN0);
    UCSR0B |= (1<<RXEN0);
    sei();
}