參數(shù)資料
型號: SAL-XC866L-4FRA
廠商: INFINEON TECHNOLOGIES AG
元件分類: 微控制器/微處理器
英文描述: 8-BIT, FLASH, 75 MHz, MICROCONTROLLER, PDSO38
封裝: GREEN, PLASTIC, TSSOP-38
文件頁數(shù): 88/113頁
文件大?。?/td> 2289K
代理商: SAL-XC866L-4FRA
SAL-XC866
Functional Description
PRELIMINARY
Data Sheet
72
V1.0, 2011-02
3.13
LIN Protocol
The UART can be used to support the Local Interconnect Network (LIN) protocol for both
master and slave operations. 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 29. The frame consists of the:
header, which comprises a Break (13-bit time low), Synch Byte (55H), and ID field
response time
data bytes (according to UART protocol)
checksum
Figure 29
Structure of LIN Frame
3.13.1
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.
The header consists of a break and synch pattern followed by an identifier. Among these
three fields, only the break pattern cannot be transmitted as a normal 8-bit UART data.
Frame slot
Frame
Response
Inter-
frame
space
Response
space
Header
Synch
Protected
identifier
Data 1
Data 2
Data N
Checksum
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