Rainbow-electronics ATmega8515L Bedienungsanleitung PDF herunterladen (Seite 186)

186

ATmega8515(L)

2512A–AVR–04/02

Figure 79. Mapping Between BS1,BS2, and the Fuse- andLock BitsDuring Read

Reading the Signature Bytes Thealgorithm forreading the Signature bytes is asfollows (refer to “Programming the

Flash”onpage 181 fordetails on Command and Address loading):

1. A:LoadCommand “0000 1000”.

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

3. Set OE

to “0”, andBS1to“0”.The selectedSignature byte can nowbe read at

DATA.

4. Set OE

to “1”.

Reading the Calibration Byte Thealgorithm forreading the Calibration byte is asfollows (refer to “Programming the

Flash”onpage 181 fordetails on Command and Address loading):

1. A:LoadCommand “0000 1000”.

2. B: Load Address LowByte,$00.

3. Set OE

to “0”, andBS1to“1”.The Calibration byte can nowbe read at DATA.

4. Set OE

to “1”.

Parallel Programming

Characteristics

Figure 80. Parallel Pr ogramming Timing,Including some General Timing

Requirements

Lock Bits

BS2

Fuse High Byte

BS1

DATA

Fuse Low Byte

Data & Contol

(DATA, XA0/1, BS1, BS2)

XTAL1

XHXL

WLWH

DVXH

XLDX

PLWL

WLRH

RDY/BSY

PAGEL

PHPL

PLBX

BVPH

XLWL

WLBX

BVWL

WLRL

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