Datasheet

• has not completed acceptance filtering or storage of an accepted message until the arbitration field of
the following message has been received. In this case acceptance filtering or message storage is
aborted and the Rx Handler starts processing of the following message.
• was not able to write a message to the Message RAM. In this case message storage is aborted.
In both cases the FIFO put index is not updated resp. the New Data flag for a dedicated Rx Buffer is not
set, a partly stored message is overwritten when the next message is stored to this location.
The flag is also set when the Tx Handler was not able to read a message from the Message RAM in time.
In this case message transmission is aborted. In case of a Tx Handler access failure the CAN is switched
into Restricted Operation Mode. To leave Restricted Operation Mode, the Host CPU has to reset
CCCR.ASM.
Value Description
0
No Message RAM access failure occurred.
1
Message RAM access failure occurred.
Bit 16 – TSW Timestamp Wraparound
Value Description
0
No timestamp counter wrap-around.
1
Timestamp counter wrapped around.
Bit 15 – TEFL Tx Event FIFO Element Lost
Value Description
0
No Tx Event FIFO element lost.
1
Tx Event FIFO element lost, also set after write attempt to Tx Event FIFO of size zero.
Bit 14 – TEFF Tx Event FIFO Full
Value Description
0
Tx Event FIFO not full.
1
Tx Event FIFO full.
Bit 13 – TEFW Tx Event FIFO Watermark Reached
Value Description
0
Tx Event FIFO fill level below watermark.
1
Tx Event FIFO fill level reached watermark.
Bit 12 – TEFN Tx Event FIFO New Entry
Value Description
0
Tx Event FIFO unchanged.
1
Tx Handler wrote Tx Event FIFO element.
Bit 11 – TFE Tx FIFO Empty
Value Description
0
Tx FIFO non-empty.
1
Tx FIFO empty.
Bit 10 – TCF Transmission Cancellation Finished
Value Description
0
No transmission cancellation finished.
1
Transmission cancellation finished.
SAM D5x/E5x Family Data Sheet
CAN - Control Area Network
© 2019 Microchip Technology Inc.
Datasheet
DS60001507E-page 1256