Rainbow-electronics ATmega128L Bedienungsanleitung PDF herunterladen (Seite 290)

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101

290

ATmega128(L)

2467B–09/01

Figure 139. 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):

1. A: Load Command “0000 1000”.

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

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 byte 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, $00.

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 140. 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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