Information

Table 45-70. Message buffer code for Rx buffers (continued)
CODE
Description
Rx Code BEFORE
receive New
Frame
SRV
1
Rx Code AFTER
successful
reception
2
RRS
3
Comment
0b0100: EMPTY -
MB is active and
empty.
EMPTY - FULL - When a frame is
received
successfully (after
the Move-in)
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
process for
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
service it, the
CODE field is
automatically
updated to
OVERRUN. See
Matching process
for details about
overrun behavior.
Table continues on the next page...
Chapter 45 CAN (FlexCAN)
K20 Sub-Family Reference Manual, Rev. 1.1, Dec 2012
Freescale Semiconductor, Inc.
Preliminary
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