ST72361AR4-Auto datasheet(178/279 Pages) STMICROELECTRONICS

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LINSCI serial communication interface (LIN master/slave)

ST72361xx-Auto

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Doc ID 12468 Rev 3

If the LHE flag is set, it means that:

D > 15.625%

If LHE flag is not set, it means that:

D < 16.40625%

If 15.625%

 D  16.40625%, then the flag can be either set or reset depending on the

dephasing between the signal on the RDI line and the CPU clock.

●

The second check is based on the measurement of each bit time between both edges

of the synch field: this checks that each of these bit times is large enough compared to

the bit time of the current baud rate.

When LHE is set due to this error then the SCI goes into a blocked state (LSF bit is set).

LIN header time-out error

When the LIN Identifier field detection method is used (by configuring LHDM to 1) or when

LIN auto-resynchronization is enabled (LASE bit = 1), the LINSCI automatically monitors the

THEADER_MAX condition given by the LIN protocol.

If the entire Header (up to and including the STOP bit of the LIN identifier field) is not

received within the maximum time limit of 57 bit times then a LIN header error is signalled

and the LHE bit is set in the SCISR register.

Figure 82.

LIN header reception timeout

The time-out counter is enabled at each break detection. It is stopped in the following

conditions:

●

A LIN identifier field has been received

●

An LHE error occurred (other than a timeout error).

●

A software reset of LSF bit (transition from high to low) occurred during the analysis of

the LIN synch field or

If LHE bit is set due to this error during the LIN synchr field (if LASE bit = 1) then the SCI

goes into a blocked state (LSF bit is set).

If LHE bit is set due to this error during fields other than LIN synch field or if LASE bit is reset

then the current received header is discarded and the SCI searches for a new break field.

Note on LIN header time-out limit

According to the LIN specification, the maximum length of a LIN header which does not

cause a timeout is equal to 1.4 * (34 + 1) = 49 TBIT_MASTER.

TBIT_MASTER refers to the master baud rate.

When checking this timeout, the slave node is desynchronized for the reception of the LIN

break and synch fields. Consequently, a margin must be allowed, taking into account the

LIN Synch

Identifier

Field

Break

THEADER

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