ATMEGA328P Configurar UART

auart1.c

#define FOSC 12000000

#define BAUD 9600

#define Rvelocidad FOSC/16/BAUD-1

void main(void){
//....

  Inicializar_UART(Rvelocidad);

}

void Inicializar_UART(unsigned int regUART){
//Configurla la velocidad
UBRR0H = (unsigned char) (regUART >> 8);
UBRR0L  = (unsigned char) ubrr;
//Habilitar la recepción y transmisión serial
UCSR0B = (1 << RXEN0 ) | (1 << TXEN0 );
//Configurar 8 bits, 2 bits de parada
UCSR0C = (1 << USBS0 ) | (3 << UCSZ00);   

}