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Chapter 25 FlexCAN
MPC5606BK Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor
561
25.4.4.2
Control (CTRL) register
This register is defined for specific FlexCAN control features related to the CAN bus, such as bit rate,
programmable sampling point within an Rx bit, Loop Back Mode, Listen Only Mode, Bus Off recovery
behavior, and interrupt enabling (Bus-Off, Error, Warning). It also determines the Division Factor for the
clock prescaler. Most of the fields in this register should only be changed while the module is in Disable
Mode or in Freeze Mode. Exceptions are the BOFF_MSK, ERR_MSK, TWRN_MSK, RWRN_MSK, and
BOFF_REC bits, which can be accessed at any time.
IDAM
ID Acceptance Mode
This 2-bit field identifies the format of the elements of the Rx FIFO filter table, as shown in
. Note that all elements of the table are configured at the same time by this field (they are
all the same format). See
Section 25.4.3, Rx FIFO structure
. This bit must be written in Freeze
mode only.
MAXMB
Maximum Number of Message Buffers
This 6-bit field defines the maximum number of message buffers that will take part in the matching
and arbitration processes. The reset value (0x0F) is equivalent to 16 MB configuration. This field
must be changed only while the module is in Freeze Mode.
Maximum MBs in use = MAXMB + 1.
Note:
MAXMB must be programmed with a value smaller or equal to the number of available
Message Buffers, otherwise FlexCAN can transmit and receive wrong messages.
Table 25-9. IDAM coding
IDAM
Format
Explanation
0b00
A
One full ID (standard or extended) per filter element.
0b01
B
Two full standard IDs or two partial 14-bit extended IDs per filter element.
0b10
C
Four partial 8-bit IDs (standard or extended) per filter element.
0b11
D
All frames rejected.
Table 25-8. MCR field descriptions (continued)
Field
Description
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