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RM0046 LIN Controller (LINFlex)

Doc ID 16912 Rev 5 511/936

Buffer identifier register (BIDR)

Figure 248. Buffer identifier register (BIDR)

Offset: 0x0034 Access: User read/write

0123456789101112131415

R 0000000000000000

Reset0000000000000000

16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

DFL DIR CCS

Reset0000000000000000

Table 251. BIDR field descriptions

Field Description

DFL

Data Field Length

This field defines the number of data bytes in the response part of the frame.

DFL = Number of data bytes – 1.

Normally, LIN uses only DFL[2:0] to manage frames with a maximum of 8 bytes of data. Identifier

filters are compatible with DFL[2:0] only. DFL[5:3] are provided to manage extended frames.

DIR

Direction

This bit controls the direction of the data field.

0 LINFlex receives the data and copies them in the BDR registers.

1 LINFlex transmits the data from the BDR registers.

CCS

Classic Checksum

This bit controls the type of checksum applied on the current message.

0 Enhanced Checksum covering Identifier and Data fields. This is compatible with LIN

specification 2.0 and higher.

1 Classic Checksum covering Data fields only. This is compatible with LIN specification 1.3 and

earlier.

In LIN slave mode (MME bit cleared in LINCR1), this bit must be configured before the header

reception. If the slave has to manage frames with 2 types of checksum, filters must be configured.

Identifier

Identifier part of the identifier field without the identifier parity.

ST SPC560P34 User Manual

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