RM0385 Datasheet, PDF (1257/1644 Pages) STMicroelectronics – This reference manual targets application developers

RM0385
Controller area network (bxCAN)
Figure 427. Example of filter numbering
)LOWHU
%DQN
),)2

,'/LVWELW
)LOWHU
1XP


)LOWHU
%DQN
),)2

,'0DVNELW

,'0DVNELW



,'/LVWELW




'HDFWLYDWHG
,'/LVWELW




,'0DVNELW



,'/LVWELW


,'/LVWELW
'HDFWLYDWHG

,'/LVWELW

,'0DVNELW

'HDFWLYDWHG
,'/LVWELW

,'/LVWELW
)LOWHU
1XP














 ,'0DVNELW


,'0DVNELW

,' ,GHQWLILHU
069
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).
DocID026670 Rev 1
1257/1644
1289