#include <avr/io.h>          
  
  int main (void)
  {
    ddra = 0xff ;
    ucsrb = (1<<rxen) ;      
    ucsrc = (1<< ucsz1)|(1<<ucsz0)|(1<<ursel);
    ubrrl = 0x33;
  
    while(1)
    {  
      while (! (ucsra & (1<<rxc)));   
  
      porta = udr;  
    }
  
    return 0 ;
  }