#include<avr/io.h>
#include<util/delay.h>
#define BAUD 9600                                   
#define BAUDRATE ((F_CPU)/(BAUD*16UL)-1) 

int main(void)
{
 
 UBRRH=(BAUDRATE>>8);
 UBRRL=BAUDRATE;
 UCSRB=(1<<TXEN)| (1<<RXEN);
 UCSRC=(1<<URSEL) | (1<<UCSZ0) | (1<<UCSZ1);

 DDRA=0xff;
 PORTA=0x00;

 

 while(1)
 {
  
   while(!(UCSRA & (1<<RXC)));
   PORTA=UDR;

}
}