
0 = Indicates the current MB has a data frame to be transmitted. In Rx MB it may be
considered in matching processes.
DLC - Length of Data in Bytes
This 4-bit field is the length (in bytes) of the Rx or Tx data, which is located in offset 0x8
through 0xF of the MB space (see
) . In reception, this field is written by the
FlexCAN module, copied from the DLC (Data Length Code) field of the received frame.
In transmission, this field is written by the CPU and corresponds to the DLC field value
of the frame to be transmitted. When RTR = 1, the frame to be transmitted is a remote
frame and does not include the data field, regardless of the DLC field (see
).
TIME STAMP - Free-Running Counter Time Stamp
This 16-bit field is a copy of the Free-Running Timer, captured for Tx and Rx frames at
the time when the beginning of the Identifier field appears on the CAN bus.
PRIO - Local priority
This 3-bit field is used only when LPRIO_EN bit is set in CAN_MCR, and it only makes
sense for Tx mailboxes. These bits are not transmitted. They are appended to the regular
ID to define the transmission priority. See
ID - Frame Identifier
In standard frame format, only the 11 most significant bits (28 to 18) are used for frame
identification in both receive and transmit cases. The 18 least significant bits are ignored.
In extended frame format, all bits are used for frame identification in both receive and
transmit cases.
DATA BYTE 0 to 7 - Data Field
Up to eight bytes can be used for a data frame.
For Rx frames, the data is stored as it is received from the CAN bus. DATA BYTE (n) is
valid only if n is less than DLC as shown in the table below.
Table 50-7. DATA BYTEs validity
DLC
Valid DATA BYTEs
0
none
1
DATA BYTE 0
2
DATA BYTE 0 to 1
3
DATA BYTE 0 to 2
4
DATA BYTE 0 to 3
5
DATA BYTE 0 to 4
Table continues on the next page...
Memory map/register definition
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
1430
NXP Semiconductors
Summary of Contents for KE1xF Series
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