ATmega32A datasheet(290/352 Pages) ATMEL

290 / 352 page

290

8155B–AVR–07/09

ATmega32A

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 high byte is listed in Table 26-3 on page 267

7. The bit mapping for fuses low byte is listed in Table 26-4 on page 268

8. The bit mapping for Lock bits byte is listed in Table 26-1 on page 266

9. Address bits exceeding PCMSB and EEAMSB (Table 26-5 and Table 26-6) are don’t care

7c. Write Lock Bits

0110011_00000000

0110001_00000000

0110011_00000000

xxxxxxx_xxxxxxxx

(1)

7d. Poll for Lock Bit Write complete

0110011_00000000

xxxxxox_xxxxxxxx

(2)

8a. Enter Fuse/Lock Bit Read

0100011_00000100

xxxxxxx_xxxxxxxx

8b. Read Fuse High Byte(6)

0111110_00000000

0111111_00000000

xxxxxxx_xxxxxxxx

xxxxxxx_oooooooo

8c. Read Fuse Low Byte(7)

0110010_00000000

0110011_00000000

xxxxxxx_xxxxxxxx

xxxxxxx_oooooooo

8d. Read Lock Bits(8)

0110110_00000000

0110111_00000000

xxxxxxx_xxxxxxxx

xxxxxxx_xxoooooo

(5)

8e. Read Fuses and Lock Bits

0111110_00000000

0110010_00000000

0110110_00000000

0110111_00000000

xxxxxxx_xxxxxxxx

xxxxxxx_oooooooo

(5)

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

Figure 26-15. JTAG Programming Instruction Set (Continued)

a = address high bits, b = address low bits, H = 0 – Low byte, 1 – High Byte, o = data out, i = data in, x = don’t care

Instruction

TDI sequence

TDO sequence

Notes

ATmega32A Datasheet(PDF) 290 Page - ATMEL Corporation

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