ATMEga64L ATMEL Corporation, ATMEga64L Datasheet - Page 325

• Manufacturer Part Number: ATMEga64L
• Description: 8-bit AVR Microcontroller with 64K Bytes In-System Programmable Flash
• Manufacturer: ATMEL Corporation

Programming the Fuses
Programming the Lock Bits
Reading the Fuses and Lock
Bits
Reading the Signature Bytes
Reading the Calibration Byte
2490G–AVR–03/04
1. Enter JTAG instruction PROG_COMMANDS.
2. Enable Fuse write using programming instruction 6a.
3. Load data Low byte using programming instructions 6b. A bit value of “0” will pro-
4. Write Fuse Extended byte using programming instruction 6c.
5. Poll for Fuse write complete using programming instruction 6d, or wait for t
6. Load data Low byte using programming instructions 6e. A bit value of “0” will pro-
7. Write Fuse High byte using programming instruction 6f.
8. Poll for Fuse write complete using programming instruction 6g, or wait for t
9. Load data low byte using programming instructions 6h. A “0” will program the
10. Write Fuse low byte using programming instruction 6i.
11. Poll for Fuse write complete using programming instruction 6j, or wait for t
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
4. Write Lock bits using programming instruction 7c.
5. Poll for Lock bit write complete using programming instruction 7d, or wait for
1. Enter JTAG instruction PROG_COMMANDS.
2. Enable Fuse/Lock bit read using programming instruction 8a.
3. To read all Fuses and Lock bits, use programming instruction 8f.
1. Enter JTAG instruction PROG_COMMANDS.
2. Enable Signature byte read using programming instruction 9a.
3. Load address 0x00 using programming instruction 9b.
4. Read first signature byte using programming instruction 9c.
5. Repeat steps 3 and 4 with address 0x01 and address 0x02 to read the second
1. Enter JTAG instruction PROG_COMMANDS.
2. Enable Calibration byte read using programming instruction 10a.
3. Load address 0x00 using programming instruction 10b.
4. Read the calibration byte using programming instruction 10c.
gram the corresponding fuse, a “1” will unprogram the fuse.
(refer to Table 1 on page 305).
gram the corresponding fuse, a “1” will unprogram the fuse.
(refer to Table 1 on page 305).
fuse, a “1” will unprogram the fuse.
(refer to Table 1 on page 305).
corresponding Lock bit, a “1” will leave the Lock bit unchanged.
t
To only read Fuse Extended 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.
and third signature bytes, respectively.
WLRH
(refer to Table 1 on page 305).
ATmega64(L)
WLRH
WLRH
WLRH
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