K60P100M100SF2RM Datasheet, PDF (1347/1809 Pages) Freescale Semiconductor, Inc – K60 Sub-Family Reference Manual

Chapter 48 CAN (FlexCAN)
Table 48-109. Message Buffer Code for Rx buffers (continued)
CODE
Description
0b0100: EMPTY -
MB is active and
empty.
Rx Code BEFORE
receive New
Frame
EMPTY
SRV¹
-
0b0010: FULL -
FULL
Yes
MB is full.
Rx Code AFTER
successful
reception²
FULL
FULL
RRS³
-
-
Comment
When a frame is
received
successfully (after
move-in process.
Refer to Section
"Move-in" for
details), the CODE
field is
automatically
updated to 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.
Refer to Section
"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. Refer
to Section
"Matching
Process" for details
about overrun
behavior.
Table continues on the next page...
K60 Sub-Family Reference Manual, Rev. 6, Nov 2011
Freescale Semiconductor, Inc.
1347