ST72361AR4-Auto datasheet(174/279 Pages) STMICROELECTRONICS

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LINSCI serial communication interface (LIN master/slave)

ST72361xx-Auto

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Doc ID 12468 Rev 3

In LIN Slave mode the LIN baud rate generator is selected instead of the conventional or

extended prescaler. The LIN baud rate generator is common to the transmitter and the

receiver.

Then the baud rate can be programmed using LPR and LPRF registers.

Note:

It is mandatory to set the LIN configuration first before programming LPR and LPRF,

because the LIN configuration uses a different baud rate generator from the standard one.

15.9.2

LIN transmission

In LIN mode the same procedure as in SCI mode has to be applied for a LIN transmission.

To transmit the LIN header the proceed as follows:

●

First set the SBK bit in the SCICR2 register to start transmitting a 13-bit LIN synch

break

●

Reset the SBK bit

●

Load the LIN synch field (0x55) in the SCIDR register to request synch field

transmission

●

Wait until the SCIDR is empty (TDRE bit set in the SCISR register)

●

Load the LIN message identifier in the SCIDR register to request Identifier

transmission.

Figure 80.

LIN characters

Bit0 Bit1 Bit2 Bit3 Bit4 Bit5 Bit6 Bit7

Start

Bit

Stop

Bit

Start

Bit

Idle Line

Start

Bit

8-bit Word length (M bit is reset)

LIN Synch Break = 13 low bits

Start

Bit

Extra

‘1’

Data Character

Next Data Character

Bit0 Bit1 Bit2 Bit3 Bit4 Bit5 Bit6 Bit7

Start

Bit

Stop

Bit

Start

Bit

LIN Synch Field

Measurement for baud rate autosynchronization

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