AN2103 Freescale Semiconductor / Motorola, AN2103 Datasheet - Page 5
AN2103
Manufacturer Part Number
AN2103
Description
Local Interconnect Network (LIN) Demonstration
Manufacturer
Freescale Semiconductor / Motorola
Datasheet
1.AN2103.pdf
(68 pages)
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AN2103
MOTOROLA
2.4 Reserved
Identifiers
2.4.1 Command
Frame Identifiers
2.4.2 Sleep Mode
Command
2.4.3 Extended
Frame Identifier
Version 2.1 of the LIN specification contains reserved identifiers;
Command frame identifiers and Extended frame identifiers.
Two COMMAND FRAME IDENTIFIERS have been reserved to
broadcast general command requests from master to all bus
participants. The frame structure is identical to regular 8-byte message
frames with the following reserved IDENTIFIER FIELDS:
0x3C – Download frame
0x7D – Upload frame
The download frame is used to send commands and data from master
to the slave nodes. The upload frame is used to trigger one of the slave
nodes (being addressed by a prior download frame) to send data to the
master.
Additionally, command frames with their first byte containing 0x00 to
0x7F are reserved for specific use by the LIN consortium. The remaining
frames are free to be assigned by the user.
The SLEEP MODE COMMAND is used to broadcast the sleep mode to
all bus nodes. The SLEEP MODE COMMAND is a download
COMMAND FRAME with the first data byte set to 0x00
Two EXTENDED FRAME IDENTIFIERS have been reserved to allow
the embedding of user defined message formats and for future
expansion without violating the specification. The frame structure is
identical to regular 8-byte message frames with the following reserved
IDENTIFIER FIELDS:
0xFE – User defined extended frame
0xBF – Future LIN extension
The identifier can be followed by an arbitrary number of LIN BYTE
FIELDS. The frame length, communication concept and data content are
not specified. Also, the length coding within the ID field does not apply
to the EXTENDED frame identifiers.
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
Local Interconnect Network Bus (LIN)
Reserved Identifiers
5
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