ATMEGA640 datasheet(353/436 Pages) MICROCHIP

353 / 436 page

353

ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET]

DS40002211A

6. Enter JTAG instruction PROG_COMMANDS.

7. Repeat steps 3 to 6 until all data have been read.

30.9.18

Programming the EEPROM

Before programming the EEPROM a Chip Erase must be performed, see “Performing Chip Erase” on page 351.

1. Enter JTAG instruction PROG_COMMANDS.

2. Enable EEPROM write using programming instruction 4a.

3. Load address High byte using programming instruction 4b.

4. Load address Low byte using programming instruction 4c.

5. Load data using programming instructions 4d and 4e.

6. Repeat steps 4 and 5 for all data bytes in the page.

7. Write the data using programming instruction 4f.

8. Poll for EEPROM write complete using programming instruction 4g, or wait for tWLRH (refer to Table 30-14

on page 338).

9. Repeat steps 3 to 8 until all data have been programmed.

Note that the PROG_PAGELOAD instruction can not be used when programming the EEPROM.

30.9.19

Reading the EEPROM

1. Enter JTAG instruction PROG_COMMANDS.

2. Enable EEPROM read using programming instruction 5a.

3. Load address using programming instructions 5b and 5c.

4. Read data using programming instruction 5d.

5. Repeat steps 3 and 4 until all data have been read.

Note that the PROG_PAGEREAD instruction can not be used when reading the EEPROM.

30.9.20

Programming the Fuses

1. Enter JTAG instruction PROG_COMMANDS.

2. Enable Fuse write using programming instruction 6a.

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

fuse, a “1” will unprogram the fuse.

4. Write Fuse High byte using programming instruction 6c.

5. Poll for Fuse write complete using programming instruction 6d, or wait for tWLRH (refer to Table 30-14 on

page 338).

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

fuse.

7. Write Fuse low byte using programming instruction 6f.

8. Poll for Fuse write complete using programming instruction 6g, or wait for tWLRH (refer to Table 30-14 on

page 338).

30.9.21

Programming the Lock Bits

1. Enter JTAG instruction PROG_COMMANDS.

2. Enable Lock bit write using programming instruction 7a.

3. Load data using programming instructions 7b. A bit value of “0” will program the corresponding lock bit, a

“1” will leave the lock bit unchanged.

4. Write Lock bits using programming instruction 7c.

5. Poll for Lock bit write complete using programming instruction 7d, or wait for tWLRH (refer to Table 30-14 on

page 338).

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