ATmega165 datasheet(256/336 Pages) ATMEL

256 / 336 page

256

ATmega165/V

2573G–AVR–07/09

Programming the Fuse Low

Bits

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

the Flash” on page 252 for details on Command and Data loading):

A: Load Command “0100 0000”.

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

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

Programming the Fuse High

Bits

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

the Flash” on page 252 for details on Command and Data loading):

A: Load Command “0100 0000”.

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

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

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

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

Programming the Extended

Fuse Bits

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

ming the Flash” on page 252 for details on Command and Data loading):

1. A: Load Command “0100 0000”.

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

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

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

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

Figure 115. Programming the FUSES Waveforms

Programming the Lock Bits

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

Flash” on page 252 for details on Command and Data loading):

A: Load Command “0010 0000”.

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 program the Boot

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.

RDY/BSY

RESET +12V

PAGEL

0x40

DATA

XA1

XA0

BS1

XTAL1

0x40

DATA

Write Fuse Low byte

Write Fuse high byte

0x40

DATA

Write Extended Fuse byte

BS2

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