ATTINY2313-20PU datasheet(21/231 Pages) ATMEL

Part #	ATTINY2313-20PU

Description	8-bit Microcontroller with 2K Bytes In-System Programmable Flash

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Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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21

ATtiny2313/V

2543I–AVR–04/06

The calibrated Oscillator is used to time the EEPROM accesses. Make sure the Oscilla-

tor frequency is within the requirements described in “Oscillator Calibration Register –

OSCCAL” on page 28.

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.

Assembly Code Example

EEPROM_write:

; Wait for completion of previous write

sbic

EECR,EEPE

rjmp

EEPROM_write

; Set up address (r17) in address register

out

EEAR, 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

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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