ST7MC1K2-Auto datasheet(175/371 Pages) STMICROELECTRONICS

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Figure 73.

LSF bit set and clear

3LHDM

LIN header detection method

This bit is set and cleared by software. It is only usable in LIN slave mode. It

enables the header detection method. In addition if the RWU bit in the SCICR2

bit).

0: LIN synch break detection method

1: LIN identifier field detection method

2LHIE

LIN header interrupt enable

This bit is set and cleared by software. It is only usable in LIN slave mode.

0: LIN header interrupt is inhibited

1: An SCI interrupt is generated whenever LHDF = 1

LHDF

LIN header detection flag

This bit is set by hardware when a LIN header is detected and cleared by a

software sequence (an access to the SCISR register followed by a read of the

SCICR3 register). It is only usable in LIN slave mode.

0: No LIN header detected

1: LIN header detected

Note: The header detection method depends on the LHDM bit:

- If LHDM = 0, a header is detected as a LIN synch break

- If LHDM = 1, a header is detected as a LIN Identifier, meaning that a LIN synch

break field + a LIN synch field + a LIN identifier field have been consecutively

received.

0LSF

LIN synch field state

This bit indicates that the LIN synch field is being analyzed. It is only used in LIN

slave mode. In auto synchronization mode (LASE bit = 1), when the SCI is in the

LIN synch field state it waits or counts the falling edges on the RDI line.

It is set by hardware as soon as a LIN synch break is detected and cleared by

hardware when the LIN synch field analysis is finished (see Figure 73). This bit

can also be cleared by software to exit LIN Synch state and return to idle mode.

0: The current character is not the LIN synch field

1: LIN synch field state (LIN synch field undergoing analysis)

Table 71.

SCICR3 register description (continued)

Bit

Name

Function

LIN synch

Identifier

Parity bits

field

break

11 dominant bits

LSF bit

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