ATTINY13-24SI View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATTINY13-24SI

8-bit Microcontroller with 1K Bytes In-System Programmable Flash

Atmel Corporation 

ATtiny13

The following code examples show one assembly and one C function for erase, write, or

atomic write of the EEPROM. The examples assume that interrupts are controlled (e.g.,

by disabling interrupts 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 Programming mode

ldi r16, (0<<EEPM1)|(0<<EEPM0)

out EECR, r16

; Set up address (r17) in address register

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 char ucAddress, unsigned char ucData)

{

/* Wait for completion of previous write */

while(EECR & (1<<EEPE))

;

/* Set Programming mode */

EECR = (0<<EEPM1)|(0>>EEPM0)

/* Set up address and data registers */

EEARL = ucAddress;

EEDR = ucData;

/* Write logical one to EEMWE */

EECR |= (1<<EEMWE);

/* Start eeprom write by setting EEWE */

EECR |= (1<<EEWE);

}

17

2535B–AVR–01/04

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