
CANx_CTRL2 field descriptions (continued)
Field
Description
0
Rx Mailbox filter’s IDE bit is always compared and RTR is never compared despite mask bits.
1
Enables the comparison of both Rx Mailbox filter’s IDE and RTR bit with their corresponding bits
within the incoming frame. Mask bits do apply.
15
TIMER_SRC
Timer Source
Selects the time tick source used for incrementing the Free Running Timer counter. This bit can be written
in Freeze mode only.
0
The Free Running Timer is clocked by the CAN bit clock, which defines the baud rate on the CAN bus.
1
The Free Running Timer is clocked by an external time tick. The period can be either adjusted to be
equal to the baud rate on the CAN bus, or a different value as required. See the device specific
section for details about the external time tick.
14
PREXCEN
Protocol Exception Enable
This bit enables the Protocol Exception feature.
NOTE: Refer to Protocol exception event in the CAN Protocol standard (ISO 11898-1) for details.
0
Protocol Exception is disabled.
1
Protocol Exception is enabled.
13
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
12
ISOCANFDEN
ISO CAN FD Enable
This field enables the CAN FD protocol according to ISO specification (ISO 11898-1) (see
NOTE: FlexCAN is able to transmit FD frame format according to CAN Protocol standard (ISO 11898-1).
0
FlexCAN operates using the non-ISO CAN FD protocol.
1
FlexCAN operates using the ISO CAN FD protocol (ISO 11898-1).
11
EDFLTDIS
Edge Filter Disable
This bit disables the Edge Filter used during the bus integration state. When the Edge Filter is enabled,
two consecutive nominal time quanta with dominant bus state are required to detect an edge that causes
synchronization. When synchronization occurs, the counting of the sequence of eleven consecutive
recessive bits is restarted. The Edge Filter prevents the dominant pulses that are shorter than a nominal
bit time (present during the data phase of an FD Frame) from being mistaken for an idle condition.
NOTE: Refer to Bus Integration state in the CAN Protocol standard (ISO 11898-1) for details.
0
Edge Filter is enabled.
1
Edge Filter is disabled.
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
Memory map/register definition
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
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NXP Semiconductors
Summary of Contents for KE1xF Series
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