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UM10503
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© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
1084 of 1269
NXP Semiconductors
UM10503
Chapter 42: LPC43xx C_CAN
42.6.2.4.5
CAN message interface message control registers
15
MSGVAL
Message valid
Remark:
The MSGVAL bit of all unused
Messages Objects is reset during the initialization
before bit INIT is reset in the CAN Control
Register. This bit must be set to zero before the
identifier ID28:0, the control bits XTD, DIR, or the
Data Length Code DLC3:0 are modified, or if the
Messages Object is no longer required.
0
R/W
0
The message object is ignored by the message
handler.
1
The message object is configured and should be
considered by the message handler.
31:16
-
-
Reserved
0
-
Table 955. CAN message interface command arbitration 2 registers (IF2_ARB2, address
0x400E 2094 (C_CAN0) and 0x400A 4094 (C_CAN1)) bit description
…continued
Bit
Symbol
Value Description
Reset
value
Access
Table 956. CAN message interface message control registers (IF1_MCTRL, address
0x400E 2038 (C_CAN0) and 0x400A 4038 (C_CAN1)) bit description
Bit
Symbol
Value
Description
Reset
value
Access
3:0
DLC3_0
Data length code
Remark:
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.
0000 to 1000 = Data frame has 0 - 8 data bytes.
1001 to 1111 = Data frame has 8 data bytes.
0000
R/W
6:4
-
reserved
-
-
7
EOB
End of buffer
0
R/W
0
Message object belongs to a FIFO buffer and is
not the last message object of that FIFO buffer.
1
Single message object or last message object of
a FIFO buffer.
8
TXRQST
Transmit request
0
R/W
0
This message object is not waiting for
transmission.
1
The transmission of this message object is
requested and is not yet done
9
RMTEN
Remote enable
0
R/W
0
At the reception of a remote frame, TXRQST is
left unchanged.
1
At the reception of a remote frame, TXRQST is
set.