LIN Controller (LINFlex)
MPC5606S Microcontroller Reference Manual, Rev. 7
856
Freescale Semiconductor
23.7.2.14 Buffer identifier register (BIDR)
Address: Base + 0x0034
Access: User read/write
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
R
DFL[0:5]
DIR
CCS
0
0
ID[0:5]
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Figure 23-20. Buffer identifier register (BIDR)
Table 23-20. BIDR field descriptions
Field
Description
0:15
Reserved
DFL[0:5]
16:21
Data Field Length
These bits define the number of data bytes in the response part of the frame.
DFL[0:5] = Number of data bytes – 1.
Normally, LIN uses only DFL[0:2] to manage frames with a maximum of 8 bytes of data. Identifier
filters are compatible with DFL[0:2] only. DFL[3:5] are provided to manage extended frames.
DIR
22
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
23
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.
24:25
Reserved
ID[0:5]
26:31
Identifier
Identifier part of the identifier field without the identifier parity.
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