ATMEGA64L-8MI View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATMEGA64L-8MI

8-bit AVR® Microcontroller with 64K Bytes In-System Programmable Flash

Atmel Corporation 

Reading the EEPROM

Programming the Fuse Low

Bits

Programming the Fuse High

Bits

Programming the Extended

Fuse Bits

The algorithm for reading the EEPROM memory is as follows (refer to “Programming the

Flash” on page 298 for details on Command and Address loading):

1. A: Load Command “0000 0011”.

2. G: Load Address High Byte (0x00 - 0xFF).

3. B: Load Address Low Byte (0x00 - 0xFF).

4. Set OE to “0”, and BS1 to “0”. The EEPROM Data byte can now be read at

DATA.

5. Set OE to “1”.

The algorithm for programming the Fuse Low bits is as follows (refer to “Programming

the Flash” on page 298 for details on Command and Data loading):

1. A: Load Command “0100 0000”.

2. C: Load Data Low Byte. Bit n = “0” programs and bit n = “1” erases the Fuse bit.

3. Set BS1 to “0” and BS2 to “0”.

4. Give WR a negative pulse and wait for RDY/BSY to go high.

The algorithm for programming the Fuse High bits is as follows (refer to “Programming

the Flash” on page 298 for details on Command and Data loading):

1. A: Load Command “0100 0000”.

2. C: Load Data Low Byte. Bit n = “0” programs and bit n = “1” erases the Fuse bit.

3. Set BS1 to “1” and BS2 to “0”. This selects high data byte.

4. Give WR a negative pulse and wait for RDY/BSY to go high.

5. Set BS1 to “0”. This selects low data byte.

The algorithm for programming the Extended Fuse bits is as follows (refer to “Program-

ming the Flash” on page 298 for details on Command and Data loading):

1. A: Load Command “0100 0000”.

2. C: Load Data Low Byte. Bit n = “0” programs and bit n = “1” erases the Fuse bit.

3. Set BS2 to “1” and BS1 to “0”. This selects extended data byte.

4. Give WR a negative pulse and wait for RDY/BSY to go high.

5. Set BS2 to “0”. This selects low data byte.

302 ATmega64(L)

2490G–AVR–03/04

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