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AVR079
Field
Size
Values
Description
Notes:
1. 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).
2. cmd1, cmd2, cmd3 and cmd4 are the instruction bytes found in the SPI Serial Programming Instruction Set found in
the device datasheet.
Table 4-16. Answer format.
Field
Answer ID
Status1
Size
1 byte
1 byte
Values
CMD_READ_FUSE_ISP
STATUS_CMD_OK
Description
Answer id
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
4.10 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.
4.11 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.
XML path: /AVRPART/ICE_SETTINGS/STK600/IspReadLock/
4.12 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.
XML path: /AVRPART/ICE_SETTINGS/STK600/IspReadSign/
4.13 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.
XML path: /AVRPART/ICE_SETTINGS/STK600/IspReadOsccal/
4.14 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 4-17. Command format.
Field
Command ID
Size
1 byte
Values
CMD_SPI_MULTI
Description
Command ID
13
8133A-AVR-04/08
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