[Atmega] EEPROM 읽기, 쓰기

#include<avr/io.h>
 
void EEPROM_write(unsigned int uiAddress, unsigned char ucData);
unsigned char EEPROM_read(unsigned int niAddress);
 
int main(void)
{
    unsigned char t;
    DDRD=0xff;
     
    t = EEPROM_read(0x123);
    PORTD = ~t;
    t = t*2;
    EEPROM_write(0x123, t);
 
    return 0;
}
void EEPROM_write(unsigned int uiAddress, unsigned char ucData)
{
    while(EECR & (1<<EEWE))
        ;
 
    EEAR = uiAddress;
    EEDR = ucData;
    EECR |= (1<<EEMWE);
    EECR |= (1<<EEWE);
}
 
unsigned char EEPROM_read(unsigned int uiAddress)
{
    while(EECR & (1<<EEWE))
        ;
 
    EEAR = uiAddress;
    EECR |= (1<<EERE);
 
    return EEDR;
}