ata6616 ATMEL Corporation, ata6616 Datasheet - Page 187

• Manufacturer Part Number: ata6616
• Description: Microcontroller With Lin Transceiver, 5v Regulator And Watchdog
• Manufacturer: ATMEL Corporation

4.16.3
4.16.3.1
4.16.3.2
Figure 4-70. Structure of a LIN Frame
9132A–AUTO–10/08
DRAFT
LIN Protocol
BREAK
Master and Slave
Frames
Break Delimiter
Field
A LIN cluster consists of one master task and several slave tasks. A master node contains the
master task as well as a slave task. All other nodes contain a slave task only.
Figure 4-68. LIN Cluster with One Master Node and “n” Slave Nodes
The master task decides when and which frame shall be transferred on the bus. The slave tasks
provide the data transported by each frame. Both the master task and the slave task are parts of
the Frame handler
A frame consists of a header (provided by the master task) and a response (provided by a slave
task).
The header consists of a BREAK and SYNC pattern followed by a PROTECTED IDENTIFIER.
The identifier uniquely defines the purpose of the frame. The slave task appointed for providing
the response associated with the identifier transmits it. The response consists of a DATA field
and a CHECKSUM field.
Figure 4-69. Master and Slave Tasks Behavior in LIN Frame
The slave tasks waiting for the data associated with the identifier receives the response and
uses the data transported after verifying the checksum.
HEADER
Slave Task 1
Slave Task 2
Master Task
SYNC
Field
PROTECTED
IDENTIFIER
master node
HEADER
master task
slave task
Response Space
Field
FRAME SLOT
ATA6616/ATA6617 [Preliminary]
RESPONSE
DATA-0
slave node
slave task
Field
LIN bus
1
RESPONSE
Each byte field is transmitted as a serial byte, LSB first.
DATA-n
HEADER
Inter-Byte Space
Field
slave node
slave task
n
CHECKSUM
RESPONSE
Field
Inter-Frame Space
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