NXP Semiconductors MPC5777C - Page 47

M_CAN_IR field descriptions (continued)
Field Description
14
MRAF
Message RAM Access Failure
The flag is set, when the Rx Handler
• 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 M_CAN is
switched into Restricted Operation Mode (see Restricted Operation Mode). To leave Restricted Operation
Mode, the CPU has to reset CCCR[ASM].
0 No Message RAM access failure occurred
1 Message RAM access failure occurred
15
TSW
Timestamp Wraparound
0 No timestamp counter wrap-around
1 Timestamp counter wrapped around
16
TEFL
Tx Event FIFO Element Lost
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
17
TEFF
Tx Event FIFO Full
0 Tx Event FIFO not full
1 Tx Event FIFO full
18
TEFW
Tx Event FIFO Watermark Reached
0 Tx Event FIFO fill level below watermark
1 Tx Event FIFO fill level reached watermark
19
TEFN
Tx Event FIFO New Entry
0 Tx Event FIFO unchanged
1 Tx Handler wrote Tx Event FIFO element
20
TFE
Tx FIFO Empty
0 Tx FIFO non-empty
1 Tx FIFO empty
21
TCF
Transmission Cancellation Finished
0 No transmission cancellation finished
1 Transmission cancellation finished
22
TC
Transmission Completed
0 No transmission completed
1 Transmission completed
Table continues on the next page...
Chapter 3 Modular CAN (M_CAN)
MPC5777C Reference Manual Addendum, Rev. 1, 12/2015
Freescale Semiconductor, Inc. 47