ATtiny167-ESSZ datasheet(237/282 Pages) ATMEL

237 / 282 page

237

7728D–AVR–07/09

ATtiny87/ATtiny167

21.7.12

Reading the Fuse and Lock Bits

The algorithm for reading the Fuse and Lock bits is as follows (refer to “Programming the

Flash” on page 232 for details on Command loading):

A: Load Command “0000 0100

b”.

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 “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 21-6. Mapping Between BS1, BS2 and the Fuse and Lock Bits During Read

21.7.13

Reading the Signature Bytes

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

on page 232 for details on Command and Address loading):

A: Load Command “0000 1000

b”.

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

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

Set OE to “1”.

21.7.14

Reading the 8 MHz RC Oscillator Calibration Byte

The algorithm for reading the 8 MHz RC Oscillator Calibration byte is as follows (refer to “Pro-

gramming the Flash” on page 232 for details on Command and Address loading):

A: Load Command “0000 1000

b”.

B: Load Address Low Byte, 0x00.

Set OE to “0”, and BS1 to “1”. The 8 MHz RC Oscillator Calibration byte can now be

read at DATA.

Set OE to “1”.

BS2

DATA

BS2

Extended Fuse Byte

Fuse Low Byte

Fuse High Byte

Lock Bits

BS1

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