ATmega128 datasheet(298/386 Pages) ATMEL

298 / 386 page

298

2467S–AVR–07/09

ATmega128

Set OE to “0”, BS2 to “1”, and BS1 to “0”. The status of the Extended Fuse bits can now

be read at DATA (“0” means programmed).

Set OE to “0”, BS2 to “0”, and BS1 to “1”. The status of the Lock bits can now be read at

DATA (“0” means programmed).

Set OE to “1”.

Figure 140. Mapping Between BS1, BS2 and the Fuse- and Lock Bits During Read

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):

A: Load Command “0000 1000”.

B: Load Address Low Byte ($00 - $02).

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

Set OE to “1”.

Reading the

Calibration Byte

The algorithm for reading the Calibration byte is as follows (refer to Programming the Flash for

details on Command and Address loading):

A: Load Command “0000 1000”.

B: Load Address Low Byte.

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

Set OE to “1”.

Parallel Programming

Characteristics

Figure 141. Parallel Programming Timing, Including some General Timing Requirements

Lock bits

BS2

Fuse high byte

BS1

DATA

Fuse Low Byte

BS2

Extended Fuse byte

Data & Contol

(DATA, XA0/1, BS1, BS2)

XTAL1

XHXL

WL WH

DVXH

XLDX

PLWL

WLRH

RDY/BSY

PAGEL

PHPL

PLBX

BVPH

XLWL

WLBX

BVWL

WLRL

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