Uart Mode Features - STMicroelectronics SPC572L series Reference Manual

LINFlexD
50.2.2

UART mode features

•
Full-duplex communication
•
Baud rate is a function of baud clock, LINIBRR and LINFBRR registers — see
Section 50.3.2.8, Baud rate generation
•
Separate clock for baud rate calculation (The relationship "(2/3)*LIN_CLK >
PBRIDGEx_CLK > 1/3*LIN_CLK" should be maintained)
•
15/16/7/8 bits data, parity
•
1/2/3 stop bits
•
12-bit + parity reception
• 4-byte buffer for reception, 4-byte buffer for transmission
•
12-bit counter for timeout management
• For bit rate ≤ 6.25 Mbit/s
–
–
• For 6.25 Mbit/s < bit rate ≤ 12.5 Mbit/s
–
–
•
For 12.5 Mbit/s < bit rate < 25 Mbit/s
–
–
50.2.3 Standard features
DMA2x bus interface
50.3 Functional description
50.3.1 LIN protocol
The LIN (Local Interconnect Network) is a serial communication protocol. 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. The master node
decides when and which frame is transferred on the bus. The slave task provides the data to
be transported by the frame.
50.3.1.1 Frames
A frame consists of a header provided by the master task and a response provided by the
slave task. The header consists of a break, a sync pattern, and an identifier. The break is
followed by the sync pattern and the sync pattern is followed by the identifier. The slave task
associated with the identifier provides the response. The response consists of a data field
and checksum. The slave task designated to receive the data associated with the identifier
receives the response and verifies the checksum.
1414/2058
Sixteen times oversampling
3:1 majority voting
Reduced over sampling programmable by the user
3:1 majority voting for reduced over sampling of 8
Reduced over sampling programmable by the user
1:1 voting for all reduced over sampling of 4, 5 and 6
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