CANx_CTRL2 field descriptions (continued)
Field
Description
If the Number of Rx FIFO Filters programmed through RFFN exceeds the SETUP_MB value
(memory space available) the exceeding ones will not be functional.
NOTE:
• The number of the last remaining available mailboxes is defined by the least value between
the NUMBER_OF_MB minus 1 and the CAN_MCR[MAXMB] field.
• If Rx Individual Mask Registers are not enabled then all Rx FIFO filters are affected by the
Rx FIFO Global Mask.
RFFN[3:
0]
Number
of Rx
FIFO filter
elements
Message
Buffers
occupied by Rx
FIFO and ID
Filter Table
Remaining
Available
Mailboxes
Rx FIFO ID Filter
Table Elements
Affected by Rx
Individual Masks
Rx FIFO ID Filter
Table Elements
Affected by Rx
FIFO Global Mask
0x0
8
MB 0-7
MB 8-15
Elements 0-7
none
0x1
16
MB 0-9
MB 10-15
Elements 0-9
Elements 10-15
0x2
24
MB 0-11
MB 12-15
Elements 0-11
Elements 12-23
0x3
32
MB 0-13
MB 14-15
Elements 0-13
Elements 14-31
0x4
40
MB 0-15
none
Elements 0-15
Elements 16-39
23–19
TASD
Tx Arbitration Start Delay
This 5-bit field indicates how many CAN bits the Tx arbitration process start point can be delayed from the
first bit of CRC field on CAN bus. See
for more details. This field can be written
only in Freeze mode because it is blocked by hardware in other modes.
18
MRP
Mailboxes Reception Priority
If this bit is set the matching process starts from the Mailboxes and if no match occurs the matching
continues on the Rx FIFO. This bit can be written only in Freeze mode because it is blocked by hardware
in other modes.
0
Matching starts from Rx FIFO and continues on Mailboxes.
1
Matching starts from Mailboxes and continues on Rx FIFO.
17
RRS
Remote Request Storing
If this bit is asserted Remote Request Frame is submitted to a matching process and stored in the
corresponding Message Buffer in the same fashion of a Data Frame. No automatic Remote Response
Frame will be generated.
If this bit is negated the Remote Request Frame is submitted to a matching process and an automatic
Remote Response Frame is generated if a Message Buffer with CODE=0b1010 is found with the same ID.
This bit can be written only in Freeze mode because it is blocked by hardware in other modes.
0
Remote Response Frame is generated.
1
Remote Request Frame is stored.
16
EACEN
Entire Frame Arbitration Field Comparison Enable For Rx Mailboxes
This bit controls the comparison of IDE and RTR bits within Rx Mailboxes filters with their corresponding
bits in the incoming frame by the matching process. This bit does not affect matching for Rx FIFO. This bit
can be written only in Freeze mode because it is blocked by hardware in other modes.
Table continues on the next page...
Chapter 50 CAN (FlexCAN)
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
NXP Semiconductors
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