Table 49-10. Message buffer code for Rx buffers (continued)
CODE
description
Rx code BEFORE
receive new
frame
SRV
Rx code AFTER
successful
RRS
Comment
CODE[0]=1: BUSY
— FlexCAN is
updating the
contents of the MB.
The CPU must not
access the MB.
BUSY
—
FULL
—
Indicates that the
MB is being
updated. It will be
negated
automatically and
does not interfere
with the next
CODE.
—
OVERRUN
—
1. SRV: Serviced MB. MB was read and unlocked by reading TIMER or other MB.
2. A frame is considered a successful reception after the frame to be moved to MB (move-in process). See
for
details.
3. Remote Request Stored bit, see "Control 2 register (CTRL2)" for details.
4. Code 0b1010 is not considered Tx and an MB with this code should not be aborted.
5. Code 0b1010 must be used in message buffers configured in CAN FD format, having the EDL bit set.
6. Note that for Tx MBs, the BUSY bit should be ignored upon read, except when AEN bit is set in the MCR register. If this bit
is asserted, the corresponding MB does not participate in the matching process.
Table 49-11. Message buffer code for Tx buffers
CODE Description
Tx Code BEFORE tx
frame
MB RTR
Tx Code AFTER
successful
transmission
Comment
0b1000: INACTIVE —
MB is not active
INACTIVE
—
—
MB does not participate
in arbitration process.
0b1001: ABORT — MB
is aborted
ABORT
—
—
MB does not participate
in arbitration process.
0b1100: DATA — MB is
a Tx data frame (MB
RTR must be 0)
DATA
0
INACTIVE
Transmit data frame
unconditionally once.
After transmission, the
MB automatically
returns to the
INACTIVE state.
0b1100: REMOTE —
MB is a Tx Remote
Request frame (MB
RTR must be 1)
REMOTE
1
EMPTY
Transmit remote
request frame
unconditionally once.
After transmission, the
MB automatically
becomes an Rx Empty
MB with the same ID.
0b1110: TANSWER —
MB is a Tx Response
frame from an incoming
Remote Request frame
TANSWER
—
RANSWER
This is an intermediate
code that is
automatically written to
the MB by the CHI as a
result of a match to a
remote request frame.
The remote response
frame will be
transmitted
unconditionally once,
Memory map/register definition
MWCT101xS Series Reference Manual, Rev. 3, 07/2019
1648
NXP Semiconductors
Summary of Contents for MWCT101 S Series
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Page 528: ...Module clocks MWCT101xS Series Reference Manual Rev 3 07 2019 528 NXP Semiconductors...
Page 634: ...SRAM configuration MWCT101xS Series Reference Manual Rev 3 07 2019 634 NXP Semiconductors...
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Page 992: ...ADC calibration scheme MWCT101xS Series Reference Manual Rev 3 07 2019 992 NXP Semiconductors...
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Page 1726: ...Debug and security MWCT101xS Series Reference Manual Rev 3 07 2019 1726 NXP Semiconductors...
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