ATtiny167-ESSZ datasheet(236/282 Pages) ATMEL

236 / 282 page

236

7728D–AVR–07/09

ATtiny87/ATtiny167

21.7.9

Programming the Fuse High Bits

The algorithm for programming the Fuse High bits is as follows (refer to “Programming the

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

A: Load Command “0100 0000

b”.

C: Load Data Low Byte. Bit n = “0” programs and bit n = “1” erases the Fuse bit.

Set BS1 to “1” and BS2 to “0”. This selects high data byte.

Give WR a negative pulse and wait for RDY/BSY to go high.

Set BS1 to “0”. This selects low data byte.

21.7.10

Programming the Extended Fuse Bits

The algorithm for programming the Extended Fuse bits is as follows (refer to “Programming

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

A: Load Command “0100 0000

b”.

C: Load Data Low Byte. Bit n = “0” programs and bit n = “1” erases the Fuse bit.

Set BS1 to “0” and BS2 to “1”. This selects extended data byte.

Give WR a negative pulse and wait for RDY/BSY to go high.

Set BS2 to “0”. This selects low data byte.

Figure 21-5. Programming the FUSES Waveforms

21.7.11

Programming the Lock Bits

The algorithm for programming the Lock bits is as follows (refer to “Programming the Flash” on

page 232 for details on Command and Data loading):

A: Load Command “0010 0000

b”.

C: Load Data Low Byte. Bit n = “0” programs the Lock bit. If LB mode 3 is pro-

grammed (LB1 and LB2 is programmed), it is not possible to re-program the Lock bits

by any External Programming mode.

Give WR a negative pulse and wait for RDY/BSY to go high.

The Lock bits can only be cleared by executing Chip Erase.

0x40

DATA

XA1 / BS2

XA0

PAGEL / BS1

0x40

DATA

Write Fuse Low byte

Write Fuse high byte

0x40

DATA

Write Extended Fuse byte

RDY/BSY

RESET +12V

XTAL1

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