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AT90USB646 Datenblatt(PDF) 26 Page - ATMEL Corporation

Teilenummer AT90USB646
Bauteilbeschribung  Microcontroller with 64/128K Bytes of ISP Flash and USB Controller
PDF  434 Pages
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Hersteller  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90USB646 Datenblatt(HTML) 26 Page - ATMEL Corporation

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26
7593A–AVR–02/06
AT90USB64/128
Note:
1. See “About Code Examples” on page 8.
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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