ATtiny261A datasheet(21/292 Pages) ATMEL

21 / 292 page

8197A–AVR–10/09

ATtiny261A/461A/861A

5.5.2

EEARL – EEPROM Address Register

• Bit 7 – EEAR7: EEPROM Address

This is the most significant EEPROM address bit of ATtiny461A. In devices with less EEPROM,

i.e. ATtiny261A, this bit is reserved and will always read zero. The initial value of the EEPROM

Address Register (EEAR) is undefined and a proper value must therefore be written before the

EEPROM is accessed.

• Bits 6:0 – EEAR6:0: EEPROM Address

These are the (low) bits of the EEPROM Address Register. The EEPROM data bytes are

addressed linearly in the range 0...128/256/512. The initial value of EEAR is undefined and a

proper value must be therefore be written before the EEPROM may be accessed.

5.5.3

EEDR – EEPROM Data Register

• Bits 7:0 – EEDR7:0: EEPROM Data

For the EEPROM write operation the EEDR Register contains the data to be written to the

EEPROM in the address given by the EEAR Register. For the EEPROM read operation, the

EEDR contains the data read out from the EEPROM at the address given by EEAR.

5.5.4

EECR – EEPROM Control Register

• Bit 7 – Res: Reserved Bit

This bit is reserved for future use and will always read zero. For compatibility with future AVR

devices, always write this bit to zero. After reading, mask out this bit.

• Bit 6 – Res: Reserved Bit

This bit is reserved and will always read as zero.

• Bits 5, 4 – EEPM1 and EEPM0: EEPROM Programming Mode Bits

The EEPROM Programming mode bits setting defines which programming action that will be

triggered when writing EEPE. It is possible to program data in one atomic operation (erase the

Bit

765

432

0x1E (0x3E)

EEAR7

EEAR6

EEAR5

EEAR4

EEAR3

EEAR2

EEAR1

EEAR0

EEARL

Read/Write

R/W

Initial Value

X/0

Bit

543210

0x1D (0x3D)

EEDR7

EEDR6

EEDR5

EEDR4

EEDR3

EEDR2

EEDR1

EEDR0

EEDR

Read/Write

R/W

Initial Value

000000

Bit

543210

0x1C (0x3C)

–

EEPM1

EEPM0

EERIE

EEMPE

EEPE

EERE

EECR

Read/Write

R/W

Initial Value

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