ST7MC1K2-Auto datasheet(161/371 Pages) STMICROELECTRONICS

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On-chip peripherals

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LIN reception

In LIN mode the reception of a byte is the same as in SCI mode but the LINSCI has features

for handling the LIN header automatically (identifier detection) or semiautomatically (synch

break detection) depending on the LIN header detection mode. The detection mode is

selected by the LHDM bit in the SCICR3.

Additionally, an automatic resynchronization feature can be activated to compensate for any

clock deviation, for more details please refer to LIN baud rate on page 165.

LIN header handling by a slave

Depending on the LIN header detection method the LINSCI signals the detection of a LIN

header after the LIN synch break or after the identifier has been successfully received.

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 third received character after a break character (included) (see

Figure 66).

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