ST7MC1K2-Auto datasheet(163/371 Pages) STMICROELECTRONICS

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When the LIN auto-resynchronization is enabled (LASE bit = 1), the LHE flag detects the

following:

●

The deviation error on the synch field is outside the LIN specification which allows up to

± 15.5% of period deviation between the slave and master oscillators.

●

A LIN header reception timeout has occurred. If THEADER >THEADER_MAX then the

LHE flag is set (only if LHDM is set to 1), see Figure 68.

●

An overflow during the synch field measurement, which leads to an overflow of the

divider registers. If LHE is set due to this error then the SCI goes into a blocked state

(LSF bit is set).

●

An overrun has occurred on fields other than the synch field (as in standard SCI mode).

Deviation error on the synch field

The deviation error is checked by comparing the current baud rate (relative to the slave

oscillator) with the received LIN synch field (relative to the master oscillator). Two checks are

performed in parallel:

●

The first check is based on a measurement between the first falling edge and the last

falling edge of the synch field. Let us refer to this period deviation as D:

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 68.

LIN header

THEADER

LIN synch

Identifier

field

break

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