ATmega165 datasheet(20/336 Pages) ATMEL

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ATmega165/V

2573G–AVR–07/09

The following code examples show one assembly and one C function for writing to the

EEPROM. The examples assume that interrupts are controlled (e.g. by disabling inter-

rupts globally) so that no interrupts will occur during execution of these functions. The

examples also assume that no Flash Boot Loader is present in the software. If such

code is present, the EEPROM write function must also wait for any ongoing SPM com-

mand to finish.

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);

}

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