ATmega32A datasheet(276/352 Pages) ATMEL

276 / 352 page

276

8155B–AVR–07/09

ATmega32A

Set BS1 to “0” and BS2 to “0”.

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

26.7.9

Programming the Fuse High Bits

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

on page 272 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.

Figure 26-5. Programming the Fuses

26.7.10

Programming the Lock Bits

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

page 272 for details on Command and Data loading):

A: Load Command “0010 0000”.

C: Load Data Low Byte. Bit n = “0” programs the Lock bit.

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

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

26.7.11

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 272 for details on Command loading):

RDY/BSY

RESET +12V

PAGEL

$40

DATA

XA1

XA0

BS1

XTAL1

$40

DATA

Write Fuse Low byte

Write Fuse high byte

BS2

ATmega32A Datasheet(PDF) 276 Page - ATMEL Corporation