AT90USB82 datasheet(22/306 Pages) ATMEL

Numer części	AT90USB82

Szczegółowy opis	8-bit Microcontroller with 8/16K Bytes of ISP Flash and USB Controller

PDF	306 Pages

Scroll/Zoom	100%

Producent	ATMEL [ATMEL Corporation]

Strona internetowa	http://www.atmel.com

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22 / 306 page

7707E–AVR–11/08

AT90USB82/162

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 command to finish.

Note:

1. See “About Code Examples” on page 7.

Assembly Code Example(1)

EEPROM_write:

; Wait for completion of previous write

sbic

EECR,EEPE

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 EEMPE

sbi

EECR,EEMPE

; Start eeprom write by setting EEPE

sbi

EECR,EEPE

ret

C Code Example(1)

void

EEPROM_write(unsigned int uiAddress, unsigned char ucData)

{

/* Wait for completion of previous write */

while(EECR & (1<<EEPE))

;

/* Set up address and Data Registers */

EEAR = uiAddress;

EEDR = ucData;

/* Write logical one to EEMPE */

EECR |= (1<<EEMPE);

/* Start eeprom write by setting EEPE */

EECR |= (1<<EEPE);

}

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