ATmega162 datasheet(241/324 Pages) ATMEL

241 / 324 page

241

2513K–AVR–07/09

ATmega162/V

Programming the

Fuse High Bits

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

on page 237 for details on Command and Data loading):

A: Load Command “0100 0000”.

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.

Programming the

Extended Fuse Bits

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

Flash” on page 237 for details on Command and Data loading):

1. A: Load Command “0100 0000”.

2. C: Load Data Low 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 data 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 100. Programming the FUSES Waveforms

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

ATmega162 Datasheet(PDF) 241 Page - ATMEL Corporation