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 

Figure 143. Mapping Between BS1, BS2 and the Fuse and Lock Bits during Read

Fuse Low Byte

0

Extended Fuse Byte

1

BS2

0

DATA

Lock Bits

Fuse High Byte

BS2

1

0

BS1

1

Reading the Signature Bytes

The algorithm for reading the Signature bytes is as follows (refer to “Programming the

Flash” for details on Command and Address loading):

1. A: Load Command “0000 1000”.

2. B: Load Address Low Byte (0x00 - 0x02).

3. Set OE to “0”, and BS1 to “0”. The selected Signature byte can now be read at

DATA.

4. Set OE to “1”.

Reading the Calibration Byte

The algorithm for reading the Calibration bytes is as follows (refer to “Programming the

Flash” for details on Command and Address loading):

1. A: Load Command “0000 1000”.

2. B: Load Address Low Byte, (0x00 - 0x03).

3. Set OE to “0”, and BS1 to “1”. The Calibration byte can now be read at DATA.

4. Set OE to “1”.

Parallel Programming

Characteristics

Figure 144. Parallel Programming Timing, Including some General Timing

Requirements

XTAL1

Data & Contol

(DATA, XA0/1, BS1, BS2)

PAGEL

WR

RDY/BSY

t DVXH

t XHXL

t XLWL

t XLDX

t BVPH

t PHPL

t PLBX t BVWL

t PLWL

t WL WH

WLRL

t WLBX

t WLRH

304 ATmega64(L)

2490G–AVR–03/04

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