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2 Overview
2.1 USB Communication
The STK600 communicates with the PC through its USB interface. The USB interface
utilizes two bulk endpoints; one IN and one OUT. The USB descriptors can be found
in the Appendix.
2.2 Packet Format
The PC sends commands to the STK600, which responds with an answer . Each
command will generate an answer.
Both commands and answers can be larger than the maximum packet size for the
bulk endpoints, so a command or answer can be split into several IN/OUT packets. A
short packet indicates the end of a command or answer.
2.3 USB Driver
In order to communicate with the STK600, a driver must be installed on the host
computer. A driver can be written from scratch or by using a driver development kit.
AVR Studio 4 bundles a USB driver licensed from Jungo ( www.jungo.com ). By
obtaining a license from Jungo, 3 rd party software can access the same driver as AVR
Studio. The user can then use both AVR Studio and other tools without changing
drivers.
Note: Firmware upgrades for STK600 can only be uploaded with the dedicated
upgrade software bundled with AVR Studio. This requires that the driver supplied with
AVR Studio to be installed.
2.4 Command format
This section describes all commands that can be entered to the STK600, and all the
possible responses that each command can give back to the host.
For all commands, the STK600 will return an answer with an answer ID that is equal
to the command ID. The first byte in a command is always the command ID, the first
byte in an answer is always the answer ID.
3 General Commands
These commands are not related to a specific programming mode.
3.1 CMD_SIGN_ON
This command returns a unique signature string for the STK600 with this
implementation of the protocol.
2
AVR079
8133A-AVR-04/08
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