RM0008
Figure 201. Example of filter numbering
Controller area network (bxCAN)
Filter
Bank
0
1
3
5
6
9
13
FIFO0
ID List (32-bit)
ID Mask (32-bit)
ID List (16-bit)
Deactivated
ID List (32-bit)
ID Mask (16-bit)
ID List (32-bit)
ID Mask (32-bit)
Filter
Num.
0
1
2
3
4
5
6
7
8
9
10
11
12
13
Filter
Bank
2
4
7
8
10
11
12
FIFO1
ID Mask (16-bit)
ID List (32-bit)
Deactivated
ID Mask (16-bit)
ID Mask (16-bit)
Deactivated
ID List (16-bit)
ID List (32-bit)
ID Mask (32-bit)
Filter
Num.
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
ID=Identifier
Filter priority rules
Depending on the filter combination it may occur that an identifier passes successfully
through several filters. In this case the filter match value stored in the receive mailbox is
chosen according to the following priority rules:
A 32-bit filter takes priority over a 16-bit filter.
For filters of equal scale, priority is given to the Identifier List mode over the Identifier
Mask mode
For filters of equal scale and mode, priority is given by the filter number (the lower the
number, the higher the priority).
Doc ID 13902 Rev 9
555/995
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