ATmega128 datasheet(296/386 Pages) ATMEL

296 / 386 page

296

2467S–AVR–07/09

ATmega128

Figure 138. Programming the EEPROM Waveforms

Reading the Flash

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

page 293 for details on Command and Address loading):

A: Load Command “0000 0010”.

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

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

Set OE to “0”, and BS1 to “0”. The Flash word low byte can now be read at DATA.

Set BS1 to “1”. The Flash word high byte can now be read at DATA.

Set OE to “1”.

Reading the EEPROM

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

on page 293 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 293 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.

RDY/BSY

RESET +12V

PAGEL

BS2

0x11

ADDR. HIGH

DATA

ADDR. LOW

DATA

ADDR. LOW

DATA

XA1

XA0

BS1

XTAL1

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