ATmega16 datasheet(269/357 Pages) ATMEL

269 / 357 page

269

2466S–AVR–05/09

ATmega16(L)

Set OE to “1”.

Reading the EEPROM

The algorithm for reading the EEPROM memory is as follows (refer to “Programming the Flash”

on page 265 for details on Command and Address loading):

A: Load Command “0000 0011”.

G: Load Address High Byte ($00 - $FF)

B: Load Address Low Byte ($00 - $FF)

Set OE to “0”, and BS1 to “0”. The EEPROM Data byte can now be read at DATA.

Set OE to “1”.

Programming the

Fuse Low Bits

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

on page 265 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 “0” and BS2 to “0”.

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 265 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 131. Programming the Fuses

RDY/BSY

RESET +12V

PAGEL

$40

DATA

XA1

XA0

BS1

XTAL1

$40

DATA

Write Fuse Low byte

Write Fuse high byte

BS2

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