ATtiny43U-MU datasheet(21/182 Pages) ATMEL

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8048B–AVR–03/09

5.6.2

EEDR – EEPROM Data Register

• Bits 7:0 – EEDR[7:0]: 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.

5.6.3

EECR – EEPROM Control Register

• Bit 7 – Res: Reserved Bit

These bits are reserved 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

These bits are reserved and will always read zero.

• Bits 5, 4 – EEPM1 and EEPM0: EEPROM 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

old value and program the new value) or to split the Erase and Write operations in two different

operations. The Programming times for the different modes are shown in Table 5-1. While EEPE

is set, any write to EEPMn will be ignored. During reset, the EEPMn bits will be reset to 0b00

unless the EEPROM is busy programming.

• Bit 3 – EERIE: EEPROM Ready Interrupt Enable

Writing EERIE to one enables the EEPROM Ready Interrupt if the I-bit in SREG is set. Writing

EERIE to zero disables the interrupt. The EEPROM Ready Interrupt generates a constant inter-

rupt when Non-volatile memory is ready for programming.

• Bit 2 – EEMPE: EEPROM Master Program Enable

The EEMPE bit determines whether writing EEPE to one will have effect or not.

Bit

765

432

0x1D (0x3D)

EEDR7

EEDR6

EEDR5

EEDR4

EEDR3

EEDR2

EEDR1

EEDR0

EEDR

Read/Write

R/W

Initial Value

Bit

765

432

0x1C (0x3C)

–

EEPM1

EEPM0

EERIE

EEMPE

EEPE

EERE

EECR

Read/Write

R/W

Initial Value

Table 5-1.

EEPROM Mode Bits

EEPM1

EEPM0

Programming

Time

Operation

3.4 ms

Erase and Write in one operation (Atomic Operation)

1.8 ms

Erase Only

1.8 ms

Write Only

–

Reserved for future use

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