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UM10503
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© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
1083 of 1269
NXP Semiconductors
UM10503
Chapter 42: LPC43xx C_CAN
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
Bit
Symbol
Value Description
Reset
value
Access
12:0
ID28_16
Message identifier
29-bit identifier (“extended frame”)
11-bit identifier (“standard frame”)
0x00
R/W
13
DIR
Message direction
0x00
R/W
0
Direction = receive.
On TXRQST, a Remote Frame with the identifier
of this Message Object is transmitted. On
reception of a Data Frame with matching
identifier, that message is stored in this Message
Object.
1
Direction = transmit.
On TXRQST, the respective Message Object is
transmitted as a Data Frame. On reception of a
Remote Frame with matching identifier, the
TXRQST bit of this Message Object is set (if
RMTEN = one).
14
XTD
Extend identifier
0x00
R/W
0
The 11-bit standard identifier will be used for this
message object.
1
The 29-bit extended identifier will be used for this
message object.
Table 954. CAN message interface command arbitration 2 registers (IF1_ARB2, address
0x400E 2034 (C_CAN0) and 0x400A 4034 (C_CAN1)) bit description
…continued
Bit
Symbol
Value Description
Reset
value
Access