XC888LM datasheet(96/144 Pages) INFINEON

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XC886/888CLM

Functional Description

Data Sheet

V0.9, 2006-12

3.15

LIN Protocol

The UART module can be used to support the Local Interconnect Network (LIN) protocol

for both master and slave operations. This option is not available with UART1 module.

The LIN baud rate detection feature provides the capability to detect the baud rate within

LIN protocol using Timer 2. This allows the UART to be synchronized to the LIN baud

rate for data transmission and reception.

LIN is a holistic communication concept for local interconnected networks in vehicles.

The communication is based on the SCI (UART) data format, a single-master/multiple-

slave concept, a clock synchronization for nodes without stabilized time base. An

attractive feature of LIN is self-synchronization of the slave nodes without a crystal or

ceramic resonator, which significantly reduces the cost of hardware platform. Hence, the

baud rate must be calculated and returned with every message frame.

The structure of a LIN frame is shown in Figure 31. The frame consists of the:

•

Header, which comprises a Break (13-bit time low), Synch Byte (55

H), and ID field

•

Response time

•

Data bytes (according to UART protocol)

•

Checksum

Figure 31

Structure of LIN Frame

3.15.1

LIN Header Transmission

LIN header transmission is only applicable in master mode. In the LIN communication,

a master task decides when and which frame is to be transferred on the bus. It also

identifies a slave task to provide the data transported by each frame. The information

needed for the handshaking between the master and slave tasks is provided by the

master task through the header portion of the frame.

Frame slot

Frame

Response

space

Header

Synch

Protected

identifier

Data 1

Data 2

Data N

Checksum

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