10

AVR069

8015B-AVR-02/06

Table 3-27. Command form

Field

Size

Value

Description

Command ID

1 byte

CMD_PROGRAM_FUSE_ISP

Command id

cmd1

1 byte

Command Byte #1

cmd2

1 byte

Command Byte #2

cmd3

1 byte

Command Byte #3

cmd4

1 byte

Command Byte #4

Note:

cmd1, cmd2, cmd3 and cmd4 are the four bytes of the low-level program fuse ISP

command.

Table 3-28. Answer format

Field

Size

Value

Description

Answer ID

1 byte

CMD_PROGRAM_FUSE_ISP

Answer id

Status1

1 byte

STATUS_CMD_OK

Will always read OK

Status2

1 byte

STATUS_CMD_OK

Will always read OK

3.2.9 CMD_READ_FUSE_ISP

This command reads the fuses of the target device.

Table 3-29. Command form

Field

Size

Value

Description

Command ID

1 byte

CMD_READ_FUSE_ISP

Command id

RetAddr

1 byte

XML: pollIndex

Return address

cmd1

1 byte

Command Byte #1

cmd2

1 byte

Command Byte #2

cmd3

1 byte

Command Byte #3

cmd4

1 byte

Command Byte #4

Note:

RetAddr indicates after which of the transmitted bytes on the SPI interface to store

the return byte, as the SPI interface is implemented as a ring buffer (one byte out,

one byte in)

Table 3-30. Answer format

Field

Size

Value

Description

Answer ID

1 byte

CMD_READ_FUSE_ISP

Answer id

Status1

1 byte

STATUS_CMD_OK

A status value indicating the

result of the operation, always

OK

data

1 byte

The fuse byte read from the

device

Status2

1 byte

STATUS_CMD_OK

A status value indicating the

result of the operation, always

OK