ATmega32A datasheet(277/352 Pages) ATMEL

277 / 352 page

277

8155B–AVR–07/09

ATmega32A

A: Load Command “0000 0100”.

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

read at DATA (“0” means programmed).

Set OE to “0”, BS2 to “1” and BS1 to “1”. The status of the Fuse High 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 26-6. Mapping between BS1, BS2 and the Fuse- and Lock Bits during Read

26.7.12

Reading the Signature Bytes

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

page 272 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”.

26.7.13

Reading the Calibration Byte

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

page 272 for details on Command and Address loading):

A: Load Command “0000 1000”.

B: Load Address Low Byte, $00.

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

Set OE to “1”.

Fuse Low Byte

Lock Bits

BS2

Fuse High Byte

BS1

DATA

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