ATmega16U4 datasheet(374/408 Pages) ATMEL

374 / 408 page

374

7766D–AVR–01/09

ATmega16U4/ATmega32U4

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 28-3 on page 349

7. The bit mapping for Fuses High byte is listed in Table 28-4 on page 350

8. The bit mapping for Fuses Low byte is listed in Table 28-5 on page 350

9. The bit mapping for Lock bits byte is listed in Table 28-1 on page 348

10. Address bits exceeding PCMSB and EEAMSB (Table 28-11 and Table 28-12) are don’t care

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

8d. Read Fuse Low Byte(8)

0110010_00000000

0110011_00000000

xxxxxxx_xxxxxxxx

xxxxxxx_oooooooo

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 28-17. 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

ATmega16U4 Datasheet(PDF) 374 Page - ATMEL Corporation

ATmega16U4 Datasheet(HTML) 374 Page - ATMEL Corporation

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