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AN2633 डेटा पत्रक PDF( Datasheet डाउनलोड )


डेटा पत्रक - LIN Drivers Application Note - Motorola

भाग संख्या AN2633
समारोह LIN Drivers Application Note
मैन्युफैक्चरर्स Motorola 
लोगो Motorola लोगो 
पूर्व दर्शन
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<?=AN2633?> डेटा पत्रक पीडीएफ

AN2633 pdf
AN2633/D
Freescale Semiconductor, Inc.
SLIC Module
The SLIC module automates many LIN bus functions, allowing more of the
CPU and memory resources to be used for the user application. This
application note compares CPU and memory usage details among
timer-based, UART-based solutions, and SLIC-based solutions.
Other SLIC module features include:
• Automatic LIN frame synchronization
• Autobauding up to and well exceeding LIN standard bus speeds
• LIN error detection
• LIN message handling
• Automatic checksum generation and verification (for both types)
• ID parity checking
The SLIC module is compatible with LIN 1.3 and LIN 2.0 and requires almost
no configuration code and very minimal driver code. More details of the SLIC
module are explained in SLIC Module Operation, Features, and Benefits.
The driver has been evaluated at 9.615 kbps, 10.417 kbps, and 19.230 kbps.
LIN Communication
A LIN network consists of a single master node and up to 15 slave nodes.
Information sent on the LIN bus is in the form of message frames, which can
be of selectable length but always have the same format. A message frame has
between 1 and 8 bytes of data in addition to the 3 bytes of control and data
security information.
Each message frame starts with the master sending out a synchronization
break signal (synchbreak field), followed by a synchronization field and a
message identifier field. The slave then responds with the data field (which can
be between 1 and 8 bytes) and then the checksum field. The synchbreak field
identifies the beginning of a new message frame and provides a regular
opportunity for the slave to synchronize on the bus clock. The synch field
contains the information for the clock synchronization and is always 0x55.
An acknowledgement procedure for correctly received LIN messages is not
defined in the LIN protocol.
HEADER
MESSAGE FRAME
RESPONSE
INTER-FRAME
SPACE
OR BREAK
SYNCH SYNCH INDENT
BREAK FIELD FIELD
DATA DATA DATA DATA CHECKSUM
FIELD FIELD FIELD FIELD FIELD
IN-FRAME
RESPONSE SPACE
INTER-BYTE
SPACE
Figure 1. LIN Message Frame
2 LIN Drivers for SLIC Module on the MC68HC908QL4
For More Information On This Product,
Go to: www.freescale.com
Free Datasheet http://www.Datasheet4U.com

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