Assembly Code Example

EEPROM_write:

; Wait for completion of previous write

Sbic EECR,EEWE

Rjmp EEPROM_write

; Set up address (r18:r17) in address register

Out EEARH, r18

Out EEARL, r17

; Write data (r16) to data register

Out EEDR,r16

; Write logical one to EEMWE

Sbi EECR,EEMWE

; Start eeprom write by setting EEWE

Sbi EECR,EEWE

Ret

C Code Example

Void EEPROM_write(unsigned int uiAddress, unsigned char ucData)

{

/* Wait for completion of previous write */

while(EECR & (1<<EEWE));

/* Set up address and data registers */

EEAR = uiAddress;

EEDR = ucData;

/* Write logical one to EEMWE */

EECR |= (1<<EEMWE);

/* Start eeprom write by setting EEWE */

EECR |= (1<<EEWE);

}

Считывание из EEPROM

Assembly Code Example

EEPROM_read:

; Wait for completion of previous write

Sbic EECR,EEWE

Rjmp EEPROM_read

; Set up address (r18:r17) in address register

Out EEARH, r18

Out EEARL, r17

; Start eeprom read by writing EERE

Sbi EECR,EERE

; Read data from data register

In r16,EEDR

Ret

C Code Example

Unsigned char EEPROM_read(unsigned int uiAddress)

{

/* Wait for completion of previous write */

while(EECR & (1<<EEWE));

/* Set up address register */

EEAR = uiAddress;

/* Start eeprom read by writing EERE */

EECR |= (1<<EERE);

/* Return data from data register */

Return EEDR;

}