ATmega169P datasheet(326/393 Pages) ATMEL

326 / 393 page

326

8018N–AVR–08/09

ATmega169P

27.9.20

Programming the Fuses

Enter JTAG instruction PROG_COMMANDS.

Enable Fuse write using programming instruction 6a.

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

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

Write Fuse High byte using programming instruction 6c.

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

WLRH (refer to

Table 27-13 on page 308).

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

will unprogram the fuse.

Write Fuse low byte using programming instruction 6f.

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

WLRH (refer to

Table 27-13 on page 308).

27.9.21

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 27-13 on page 308).

27.9.22

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 8e.

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

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

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

27.9.23

Reading the Signature Bytes

Enter JTAG instruction PROG_COMMANDS.

Enable Signature byte read using programming instruction 9a.

Load address 0x00 using programming instruction 9b.

Read first signature byte using programming instruction 9c.

Repeat steps 3 and 4 with address 0x01 and address 0x02 to read the second and third

signature bytes, respectively.

27.9.24

Reading the Calibration Byte

Enter JTAG instruction PROG_COMMANDS.

Enable Calibration byte read using programming instruction 10a.

Load address 0x00 using programming instruction 10b.

Read the calibration byte using programming instruction 10c.

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