하이퍼터미널 연결후
비트/초(B): 19200

#include "EHA.h"
//#include<avr/io.h>

#define FOSC 16000000
#define BAUD 19200
#define MYUBRR FOSC/16l/BAUD-1  //16l long

void USART_Init(unsigned int ubrr);
void USART_Transtmit(unsigned char data);
unsigned char USART_Receive(void);

int main(void)
{
 DDRF=0XFF;
 PORTF=0XFF;
 //unsigned char REC;
 //volatile int n;
 //unsigned char len[10] = "hello";
 //unsigned char* len = "hello";
 
 USART_Init(MYUBRR);

 while(1)
 {
  switch(USART_Receive())
  {
   case '1':
    PORTF=0X00;
    break;
   case '2':
    PORTF=0XFF;
    break;
  }
 }
 /*
 for(n=0; len[n]!='\0'; ++n){
  USART_Transtmit(len[n]);
 }
 
 while(1){
  REC=USART_Receive();
  REC++;
  USART_Transtmit(REC);
 }
 */
  
 while(1);
 return 0;
}
//USART 초기화
void USART_Init(unsigned int ubrr)
{
 //Set baud rate
 UBRR1H = (unsigned char) (ubrr>>8);
 UBRR1L = (unsigned char)ubrr;
 
 // Enabe receiver and transmitter
 UCSR1B = (1<<RXEN) |(1<<TXEN); //UCSR1B = 0X18;
 //UCSR1C = (1<<USBS) |(3<<UCSZ0); //UCSR1C = 0X0E;
 UCSR1C = (3<<UCSZ0); //UCSR1C = 0X06;
}

void USART_Transtmit(unsigned char data)
{
 while(!(UCSR1A & (1<<UDRE)))
  ;
 UDR1= data;
}

unsigned char USART_Receive(void)
{
 while(!(UCSR1A & (1<<RXC)))
  ;
 return UDR1;
}