ST72361AR4-Auto datasheet(176/279 Pages) STMICROELECTRONICS

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LINSCI serial communication interface (LIN master/slave)

ST72361xx-Auto

176/279

Doc ID 12468 Rev 3

Note:

It is recommended to combine the header detection function with Mute mode. Putting the

LINSCI in mute mode allows the detection of Headers only and prevents the reception of

any other characters.

This mode can be used to wait for the next header without being interrupted by the data

bytes of the current message in case this message is not relevant for the application.

Synch break detection (LHDM = 0)

When a LIN synch break is received:

●

The RDRF bit in the SCISR register is set. It indicates that the content of the shift

●

The LHDF flag in the SCICR3 register indicates that a LIN synch break field has been

detected.

●

An interrupt is generated if the LHIE bit in the SCICR3 register is set and the I[1:0] bits

are cleared in the CCR register.

●

Then the LIN synch field is received and measured.

–

If automatic resynchronization is enabled (LASE bit = 1), the LIN synch field is not

transferred to the shift register: there is no need to clear the RDRF bit.

–

If automatic resynchronization is disabled (LASE bit = 0), the LIN synch field is

received as a normal character and transferred to the SCIDR register and RDRF is

set.

Note:

In LIN slave mode, the FE bit detects all frame error which does not correspond to a break.

Identifier detection (LHDM = 1)

This case is the same as the previous one except that the LHDF and the RDRF flags are set

only after the entire header has been received (this is true whether automatic

resynchronization is enabled or not). This indicates that the LIN Identifier is available in the

SCIDR register.

Note:

During LIN synch field measurement, the SCI state machine is switched off: no characters

are transferred to the data register.

LIN slave parity

In LIN slave mode (LINE and LSLV bits are set) LIN parity checking can be enabled by

setting the PCE bit.

In this case, the parity bits of the LIN identifier field are checked. The identifier character is

recognized as the 3rd received character after a break character (included):

The bits involved are the two MSB positions (7th and 8th bits if M = 0; 8th and 9th bits if

M = 0) of the identifier character. The check is performed as specified by the LIN

specification:

LIN Synch

Identifier

parity bits

Field

Break

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