#define F_CPU 3686400
#define UART_UBRR_CALC(BAUD_,FREQ) ((FREQ)/((BAUD_)*16L)-1)
#define UART_BAUD_RATE 9600

int main(void)
{
    UCSRB |= (1<<TXEN);
    UCSRC |= (1<<URSEL) | (3<<UCSZ0);
    UBRRH = (uint8_t)(UART_UBRR_CALC(UART_BAUD_RATE,F_CPU)>>8);
    UBRRL = (uint8_t)UART_UBRR_CALC(UART_BAUD_RATE,F_CPU);	
	
    while (1)
    {
	while(!(UCSRA & (1<<UDRE)))
	    ;
	UDR = 'x';
    }
}