AVR069

11

8015B-AVR-02/06

3.2.10 CMD_PROGRAM_LOCK_ISP

See CMD_PROGRAM_FUSE. This command is basically the same as the program

fuse command, only that ISP commands for programming the lock byte must be

supplied.

3.2.11 CMD_READ_LOCK_ISP

See CMD_READ_FUSE. This command is basically the same as the read fuse

command, only that ISP commands for reading the lock byte must be supplied.

3.2.12 CMD_READ_SIGNATURE_ISP

See CMD_READ_FUSE. This command is basically the same as the read fuse

command, only that ISP commands for reading one of the signature bytes must be

supplied.

3.2.13 CMD_READ_OSCCAL_ISP

See CMD_READ_FUSE. This command is basically the same as the read fuse

command, only that ISP commands for reading the OSCCAL byte must be supplied.

3.2.14 CMD_SPI_MULTI

This is a generic command that can be used to execute any of the ISP commands.

The command writes a number of bytes to the SPI bus, and returns a number of

bytes.

Table 3-31. Command format

Field

Size

Value

Description

Command ID

1 byte

CMD_SPI_MULTI

Command ID

NumTx

1 byte

0-255

Number of bytes to transmit

NumRx

1 byte

0-255

Number of bytes to receive

RxStartAddr

1 byte

Start address of returned data.

Specifies on what transmitted byte

the response is to be stored and

returned.

TxData

0-255

bytes

The data be transmitted. The size

is specified by NumTx

Note:

If the number of bytes to receive is greater than number of bytes to transmit, then the

firmware will pad with the necessary 0x00 bytes. This is in order to save time-

consuming transfer from PC to the programmer.

Table 3-32. Answer format

Field

Size

Value

Description

Answer ID

1 byte

CMD_SPI_MULTI

Answer id

Status1

1 byte

STATUS_CMD_OK

Will always read OK

data

0-255

bytes

The data read from the ISP bus as

indicated in the command

Status2

1 byte

STATUS_CMD_OK

Will always read OK