ST STM32F40 Series User Manual

Controller area network (bxCAN) RM0090
677/1422 Doc ID 018909 Rev 4
Figure 232. Example of filter numbering
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).
9
8
ID List (32-bit)
ID Mask (32-bit)
ID List (16-bit)
ID List (32-bit)
Deactivated
ID Mask (16-bit)
ID List (32-bit)
Filter
0
1
3
5
6
9
ID Mask (32-bit)
13
FIFO0
Filter
0
1
2
3
4
5
6
7
10
11
12
13
ID Mask (16-bit)
ID List (32-bit)
ID Mask (16-bit)
ID List (16-bit)
Deactivated
ID Mask (16-bit)
ID List (32-bit)
Filter
2
4
7
8
10
11
ID Mask (32-bit)
12
FIFO1
Filter
0
1
2
4
5
6
7
8
11
12
13
14
3
Deactivated
9
10
Num. Num.BankBank
ID=Identifier

ST STM32F40 Series Specifications

General

Brand	ST
Model	STM32F40 Series
Category	Microcontrollers
Language	English