ATA6617 View Datasheet(PDF) - Atmel Corporation

Part Name

Description

MFG CO.

ATA6617

8K/16K Flash Microcontroller with LIN Transceiver, 5V Regulator and Watchdog

Atmel Corporation 

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4.4.5.2

4.4.5.3

• Bits 8:0 – EEAR8:0: EEPROM Address

The EEPROM Address Registers – EEARH and EEARL – specifies the high EEPROM

address in the EEPROM space (see “E2 size” in Table 4-3 on page 39). The EEPROM data

bytes are addressed linearly between 0 and “E2 size”. The initial value of EEAR is undefined.

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

Note: For information only - ATtiny47: EEAR8 exists as register bit but it is not used for addressing.

EEDR – EEPROM Data Register

Bit

Read/Write

Initial Value

7

EEDR7

R/W

0

6

EEDR6

R/W

0

5

EEDR5

R/W

0

4

EEDR4

R/W

0

3

EEDR3

R/W

0

2

EEDR2

R/W

0

1

EEDR1

R/W

0

0

EEDR0

R/W

0

EEDR

• 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.

EECR – EEPROM Control Register

Bit

7

–

Read/Write

R

Initial Value

0

6

5

4

3

2

1

0

–

EEPM1 EEPM0 EERIE EEMPE EEPE EERE EECR

R

R/W

R/W

R/W

R/W

R/W

R/W

0

X

X

0

0

X

0

• Bit 7,6 – Res: Reserved Bits

These bits are reserved for future use and will always read as 0 in Atmel ATtiny87/167. After

reading, mask out these bits. For compatibility with future AVR® devices, always write these

bits to 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

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

ent operations. The Programming times for the different modes are shown in Table 4-4. 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.

Table 4-4. EEPROM Mode Bits

EEPM1

EEPM0

Typical

Programming

Time

0

0

3.4ms

0

1

1.8ms

1

0

1.8ms

1

1

–

Operation

Erase and Write in one operation (Atomic Operation)

Erase Only

Write Only

Reserved for future use

46 Atmel ATA6616/ATA6617

9132D–AUTO–12/10

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