CODE - Message Buffer Code
This 4-bit field can be accessed (read or write) by the CPU and by the FlexCAN module
itself, as part of the message buffer matching and arbitration process. The encoding is
shown in
for additional
information.
Table 50-5. Message buffer code for Rx buffers
CODE
description
Rx code BEFORE
receive new
frame
SRV
Rx code AFTER
successful
RRS
Comment
0b0000: INACTIVE
- MB is not active.
INACTIVE
-
-
-
MB does not
participate in the
matching process.
0b0100: EMPTY -
MB is active and
empty.
EMPTY
-
FULL
-
When a frame is
received
successfully (after
)
process), the
CODE field is
automatically
updated to FULL.
0b0010: FULL - MB
is full.
FULL
Yes
FULL
-
The act of reading
the C/S word
followed by
unlocking the MB
(SRV) does not
make the code
return to EMPTY. It
remains FULL. If a
new frame is
moved to the MB
after the MB was
serviced, the code
still remains FULL.
See
matching details
related to FULL
code.
No
OVERRUN
-
If the MB is FULL
and a new frame is
moved to this MB
before the CPU
services it, the
CODE field is
automatically
updated to
OVERRUN. See
Table continues on the next page...
Memory map/register definition
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
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NXP Semiconductors
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