saf-xc888cm-8ffi5v Infineon Technologies Corporation, saf-xc888cm-8ffi5v Datasheet - Page 96

• Manufacturer Part Number: saf-xc888cm-8ffi5v
• Description: 8-bit Single-chip Microcontroller
• Manufacturer: Infineon Technologies Corporation

3.15
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
3.15.1
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.
Data Sheet
Header, which comprises a Break (13-bit time low), Synch Byte (55
Response time
Data bytes (according to UART protocol)
Checksum
LIN Protocol
LIN Header Transmission
Header
Structure of LIN Frame
Synch
Protected
identifier
Response
Frame slot
space
Frame
Data 1
Figure
89
Response
31. The frame consists of the:
Data 2
Data N
Functional Description
Checksum
XC886/888CLM
H
), and ID field
V1.1, 2009-01