ATmega128 datasheet(317/386 Pages) ATMEL

317 / 386 page

317

2467S–AVR–07/09

ATmega128

Programming the

Fuses

Enter JTAG instruction PROG_COMMANDS.

Enable Fuse write using programming instruction 6a.

Load data byte using programming instructions 6b. A bit value of “0” will program the cor-

responding fuse, a “1” will unprogram the fuse.

Write Extended Fuse byte using programming instruction 6c.

Poll for Fuse write complete using programming instruction 6d, or wait for t

WLRH (refer to

Table Note: on page 299).

Load data byte using programming instructions 6e. A bit value of “0” will program the cor-

responding fuse, a “1” will unprogram the fuse.

Write Fuse high byte using programming instruction 6f.

Poll for Fuse write complete using programming instruction 6g, or wait for t

WLRH (refer to

Table Note: on page 299).

Load data byte using programming instructions 6h. A “0” will program the fuse, a “1” will

unprogram the fuse.

10. Write Fuse low byte using programming instruction 6i.

11. Poll for Fuse write complete using programming instruction 6j, or wait for t

WLRH (refer to

Table Note: on page 299).

Programming the Lock

Bits

Enter JTAG instruction PROG_COMMANDS.

Enable Lock bit write using programming instruction 7a.

Load data using programming instructions 7b. A bit value of “0” will program the corre-

sponding lock bit, a “1” will leave the lock bit unchanged.

Write Lock bits using programming instruction 7c.

Poll for Lock bit write complete using programming instruction 7d, or wait for t

WLRH (refer

to Table Note: on page 299).

Reading the Fuses

and Lock Bits

Enter JTAG instruction PROG_COMMANDS.

Enable Fuse/Lock bit read using programming instruction 8a.

To read all Fuses and Lock bits, use programming instruction 8f.

To only read Extended Fuse byte, use programming instruction 8b.

To only read Fuse high byte, use programming instruction 8c.

To only read Fuse low byte, use programming instruction 8d.

To only read Lock bits, use programming instruction 8e.

Reading the Signature

Bytes

Enter JTAG instruction PROG_COMMANDS.

Enable Signature byte read using programming instruction 9a.

Load address $00 using programming instruction 9b.

Read first signature byte using programming instruction 9c.

Repeat steps 3 and 4 with address $01 and address $02 to read the second and third

signature bytes, respectively.

Reading the

Calibration Byte

Enter JTAG instruction PROG_COMMANDS.

Enable Calibration byte read using programming instruction 10a.

Load address $00 using programming instruction 10b.

Read the calibration byte using programming instruction 10c.

ATmega128 Datasheet(PDF) 317 Page - ATMEL Corporation

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