Field
Function
the frame reception. This bit can be written only in Freeze mode because it is blocked by hardware in
other modes.
0b - Self-reception enabled.
1b - Self-reception disabled.
16
IRMQ
Individual Rx Masking And Queue Enable
This bit indicates whether Rx matching process will be based either on individual masking and queue or
on masking scheme with RXMGMASK, RX14MASK, RX15MASK, and RXFGMASK. This bit can be
written in Freeze mode only because it is blocked by hardware in other modes.
0b - Individual Rx masking and queue feature are disabled. For backward compatibility with legacy
applications, the reading of C/S word locks the MB even if it is EMPTY.
1b - Individual Rx masking and queue feature are enabled.
15
DMA
DMA Enable
DMA controls whether the DMA feature is enabled or not. The DMA feature can only be used in Rx FIFO,
so consequently MCR[RFEN] must be asserted. When DMA and RFEN are set, IFLAG1[BUF5I]
generates the DMA request and no RX FIFO interrupt is generated. This bit can be written in Freeze
mode only as it is blocked by hardware in other modes.
0b - DMA feature for RX FIFO disabled.
1b - DMA feature for RX FIFO enabled.
14
PNET_EN
Pretended Networking Enable
This bit enables the Pretended Networking functionality. When in Stop mode, PE sub-block is kept
operational, making it able to process Rx message filtering as defined by the Pretended Networking
configuration registers. See
Receive process under Pretended Networking mode
. This bit can be written
in Freeze mode only.
NOTE: This field is not supported in every instance. The following table includes only supported
registers.
Field supported in
Field not supported in
FlexCAN0_MCR
—
—
FlexCAN1_MCR
—
FlexCAN2_MCR
0b - Pretended Networking mode is disabled.
1b - Pretended Networking mode is enabled.
13
LPRIOEN
Local Priority Enable
This bit is provided for backwards compatibility with legacy applications. It controls whether the local
priority feature is enabled or not. It is used to expand the ID used during the arbitration process. With this
expanded ID concept, the arbitration process is done based on the full 32-bit word, but the actual
transmitted ID still has 11-bit for standard frames and 29-bit for extended frames. This bit can be written
only in Freeze mode because it is blocked by hardware in other modes.
0b - Local Priority disabled.
1b - Local Priority enabled.
12
AEN
Abort Enable
When asserted, this bit enables the Tx abort mechanism. This mechanism guarantees a safe procedure
for aborting a pending transmission, so that no frame is sent in the CAN bus without notification. This bit
can be written only in Freeze mode because it is blocked by hardware in other modes.
NOTE: When MCR[AEN] is asserted, only the abort mechanism (see
)
must be used for updating mailboxes configured for transmission.
CAUTION: Writing the Abort code into Rx mailboxes can cause unpredictable results when MCR[AEN]
is asserted.
Table continues on the next page...
Chapter 49 FlexCAN
MWCT101xS Series Reference Manual, Rev. 3, 07/2019
NXP Semiconductors
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