ATmega325P datasheet(26/364 Pages) ATMEL

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ATmega325P データシート(PDF) 26 Page - ATMEL Corporation

部品番号	ATmega325P

部品情報	8-bit Microcontroller with 32K Bytes In-System Programmable Flash

PDF	364 Pages

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メーカー	ATMEL [ATMEL Corporation]

ホームページ	http://www.atmel.com

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8023F–AVR–07/09

ATmega325P/3250P

The next code examples show assembly and C functions for reading the EEPROM. The exam-

ples assume that interrupts are controlled so that no interrupts will occur during execution of

these functions.

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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