ATMEGA640 datasheet(349/436 Pages) MICROCHIP

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349

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

DS40002211A

Notes: 1. This command sequence is not required if the seven MSB are correctly set by the previous command sequence (which is

normally the case).

2. Repeat until o = “1”.

3. Set bits to “0” to program the corresponding Fuse, “1” to unprogram the Fuse.

4. Set bits to “0” to program the corresponding Lock bit, “1” to leave the Lock bit unchanged.

5. “0” = programmed, “1” = unprogrammed.

6. The bit mapping for Fuses Extended byte is listed in Table 30-3 on page 326.

7. The bit mapping for Fuses High byte is listed in Table 30-4 on page 327.

8. The bit mapping for Fuses Low byte is listed in Table 30-5 on page 327.

9. The bit mapping for Lock bits byte is listed in Table 30-1 on page 325.

10. Address bits exceeding PCMSB and EEAMSB (Table 30-7 and Table 30-8 on page 328) are don’t care.

11. All TDI and TDO sequences are represented by binary digits (0b...).

8e. Read Lock Bits(9)

0110110_00000000

0110111_00000000

xxxxxxx_xxxxxxxx

xxxxxxx_xxoooooo

(5)

8f. Read Fuses and Lock Bits

0111010_00000000

0111110_00000000

0110010_00000000

0110110_00000000

0110111_00000000

xxxxxxx_xxxxxxxx

xxxxxxx_oooooooo

(5)

Fuse Ext. byte

Fuse High byte

Fuse Low byte

Lock bits

9a. Enter Signature Byte Read

0100011_00001000

xxxxxxx_xxxxxxxx

9b. Load Address Byte

0000011_bbbbbbbb

xxxxxxx_xxxxxxxx

9c. Read Signature Byte

0110010_00000000

0110011_00000000

xxxxxxx_xxxxxxxx

xxxxxxx_oooooooo

10a. Enter Calibration Byte Read

0100011_00001000

xxxxxxx_xxxxxxxx

10b. Load Address Byte

0000011_bbbbbbbb

xxxxxxx_xxxxxxxx

10c. Read Calibration Byte

0110110_00000000

0110111_00000000

xxxxxxx_xxxxxxxx

xxxxxxx_oooooooo

11a. Load No Operation Command

0100011_00000000

0110011_00000000

xxxxxxx_xxxxxxxx

Table 30-18. JTAG Programming Instruction (Continued)

Set (Continued) a = address high bits, b = address low bits, c = address extended bits, H = 0 - Low byte, 1 - High Byte,

o = data out, i = data in, x = don’t care

Instruction

TDI Sequence

TDO Sequence

Notes

ATMEGA640 Datasheet(PDF) 349 Page - Microchip Technology

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