ATTINY441 datasheet(21/366 Pages) ATMEL

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ATtiny441/841 [DATASHEET]

8495H–AVR–05/2014

The next code examples show assembly and C functions for reading the EEPROM. The examples assume that

interrupts are controlled so that no interrupts will occur during execution of these functions.

Note:

See “Code Examples” on page 6.

Note:

See “Code Examples” on page 6.

5.4

5.4.1

EEARH – EEPROM Address Register High



Bits 7:1 – Res: Reserved

These bits are reserved and will always read zero.



Bit 0 – EEAR8: EEPROM Address

This is the high address bit in ATtiny841. It is not implemented in ATtiny441.

Assembly Code Example

EEPROM_read:

; Wait for completion of previous write

sbic

EECR, EEPE

rjmp

EEPROM_read

; Set up address (r18:r17) in address registers

out

EEARH, r18

out

EEARL, r17

; Start eeprom read by writing EERE

sbi

EECR, EERE

; Read data from data register

r16, EEDR

ret

C Code Example

unsigned char EEPROM_read(unsigned int ucAddress)

{

/* Wait for completion of previous write */

while(EECR & (1<<EEPE));

/* Set up address register */

EEAR = ucAddress;

/* Start eeprom read by writing EERE */

EECR |= (1<<EERE);

/* Return data from data register */

return EEDR;

}

Bit

0x1F (0x3F)

––

–

EEAR8

EEARH

Read/Write

RRR

R/W

Initial Value

X/0

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