Datasheet
This field has a different meaning depending on the configuration of SFEC:
•
SFEC = “001”...“110”–Second ID of standard ID filter element
• SFEC = “111”–Filter for Rx Buffers or for debug messages
SFID2[10:9] decides whether the received message is stored into an Rx Buffer or treated as message A, B, or C of
the debug message sequence.
0: Store message in a Rx buffer
1: Debug Message A
2: Debug Message B
3: Debug Message C
SFID2[5:0] defines the index of the dedicated Rx Buffer element to which a matching message is stored.
49.5.7.6 Extended Message ID Filter Element
Up to 64 filter elements can be configured for 29-bit extended IDs. When accessing an Extended Message ID Filter
element, its address is the Filter List Extended Start Address MCAN_XIDFC.FLESA plus two times the index of the
filter element (0…63).
T
able 49-11. Extended Message ID Filter Element
31 24 23 16 15 8 7 0
F0 EFEC
[2:0]
EFID1[28:0]
F1 EFT[1:0] – EFID2[28:0]
• F0 Bit 31:29 EFEC[2:0]: Extended Filter Element Configuration
All enabled filter elements are used for acceptance filtering of extended frames. Acceptance filtering stops at the first
matching enabled filter element or when the end of the filter list is reached. If EFEC = “100”, “101”, or “1
10”, a match
sets the interrupt flag MCAN_IR.HPM and, if enabled, an interrupt is generated. In this case, register MCAN_HPMS
is updated with the status of the priority match.
0: Disable filter element
1: Store in Rx FIFO 0 if filter matches
2: Store in Rx FIFO 1 if filter matches
3: Reject ID if filter matches
4: Set priority if filter matches
5: Set priority and store in FIFO 0 if filter matches
6: Set priority and store in FIFO 1 if filter matches
7: Store into Rx Buffer or as debug message, configuration of EFT[1:0] ignored
• F0 Bits 28:0 EFID1[28:0]: Extended Filter ID 1
First ID of extended ID filter element.
When filtering for Rx Buffers or for debug messages this field defines the ID of an extended message to be stored.
The received identifiers must match exactly, only MCAN_XIDAM masking mechanism (see Extended Message ID
Filtering) is used.
• F1 Bits 31:30 EFT[1:0]: Extended Filter Type
0: Range filter from EF1ID to EF2ID (EF2ID ≥ EF1ID)
1: Dual ID filter for EF1ID or EF2ID
2: Classic filter: EF1ID = filter, EF2ID = mask
3: Range filter from EF1ID to EF2ID (EF2ID ≥ EF1ID), MCAN_XIDAM mask not applied
SAM E70/S70/V70/V71 Family
Controller Area Network (MCAN)
© 2019 Microchip T
echnology Inc.
Datasheet
DS60001527D-page 1429