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DCAN Control Registers
1485
SPNU563A–March 2018
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Controller Area Network (DCAN) Module
Table 27-28. IF1/IF2 Message Control Register Field Descriptions
Bit Field Value Description
31-16 Reserved 0 These bits are always read as 0. Writes have no effect.
15 NewDat New Data
0 No new data has been written into the data portion of this message object by the Message Handler
since the last time this flag was cleared by the CPU.
1 The Message Handler or the CPU has written new data into the data portion of this message
object.
14 MsgLst Message Lost (only valid for message objects with direction = receive).
0 No message lost since the last time when this bit was reset by the CPU.
1 The Message Handler stored a new message into this object when NewDat was still set, so the
previous message has been overwritten.
13 IntPnd Interrupt Pending
0 This message object is not the source of an interrupt.
1 This message object is the source of an interrupt. The interrupt identifier in the interrupt register will
point to this message object if there is no other interrupt source with higher priority.
12 UMask Use Acceptance Mask
0 Mask is ignored.
1 Use Mask (Msk[28:0], MXtd, and MDir) for acceptance filtering.
If the UMask bit is set to 1, the message object's mask bits have to be programmed during
initialization of the message object before MsgVal is set to 1.
11 TxIE Transmit interrupt enable.
0 IntPnd will not be triggered after the successful transmission of a frame.
1 IntPnd will be triggered after the successful transmission of a frame.
10 RxIE Receive interrupt enable.
0 IntPnd will not be triggered after the successful reception of a frame.
1 IntPnd will be triggered after the successful reception of a frame.
9 RmtEn Remote enable.
0 At the reception of a Remote Frame, TxRqst is not changed.
1 At the reception of a Remote Frame, TxRqst is set.
8 TxRqst Transmit request.
0 This message object is not waiting for a transmission.
1 The transmission of this message object is requested and not yet done.
7 EoB End of Block
0 The message object is part of a FIFO Buffer block and is not the last message object of this FIFO
Buffer block.
1 The message object is a single message object or the last message object in a FIFO Buffer block.
Note: This bit is used to concatenate multiple message objects to build a FIFO Buffer. For single
message objects (not belonging to a FIFO Buffer), this bit must always be set to 1.
6-4 Reserved 0 These bits are always read as 0. Writes have no effect.
3-0 DLC Data Length Code
0-8h Data Frame has 0-8 data bits.
9h-Fh Data Frame has 8 data bytes.
Note: The Data Length Code of a message object must be defined the same as in all the
corresponding objects with the same identifier at other nodes. When the message handler stores a
data frame, it will write the DLC to the value given by the received message.
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