Datasheet

UM10398 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2014. All rights reserved.
User manual Rev. 12.3 — 10 June 2014 298 of 547
NXP Semiconductors
UM10398
Chapter 16: LPC111x/LPC11Cxx C_CAN controller
16.6.2.4.3 CAN message interface c arbitration 1 registers
[1]
16.6.2.4.4 CAN message interface arbitration 2 registers
[1]
Table 260. CAN message interface arbitration 1 registers (CANIF1_ARB1, address
0x4005 0030 and CANIF2_ARB1, address 0x4005 0090) bit description
Bit Symbol Description Reset
value
Access
15:0 ID15_0 Message identifier [15:0]
29-bit identifier (extended frame)
11-bit identifier (standard frame). These bits are not used
for 11-bit identifiers.
0x00 R/W
31:16 - Reserved 0 -
Table 261. CAN message interface arbitration 2 registers (CANIF1_ARB2, address 0x4005 0034 and CANIF2_ARB2,
address 0x4005 0094) bit description
Bit Symbol Value Description Reset
value
Access
12:0
ID[28:16]
ID[28:18]
Message identifier
29-bit identifier (extended frame)
11-bit identifier (standard frame). ID[17:16] are not used for 11-bit
identifiers.
0x00 R/W
13 DIR Message direction 0x00 R/W
0 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.
1Transmit.
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 Standard. The 11-bit standard identifier will be used for this message
object.
1 Extended. The 29-bit extended identifier will be used for this message
object.
15 MSGVAL Message valid
Remark: The CPU must reset the MSGVAL bit of all unused Messages
Objects during the initialization before it resets bit INIT in the CAN Control
Register. This bit must also be reset 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.
0R/W
0 Invalid. The message object is ignored by the message handler.
1 Valid. The message object is configured and should be considered by the
message handler.
31:16 - - Reserved 0 -