UM10503
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© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
1077 of 1269
NXP Semiconductors
UM10503
Chapter 42: LPC43xx C_CAN
6
MASK
Access mask bits
0
R/W
0
Mask bits unchanged.
1
Transfer Identifier MASK + MDIR + MXTD to
message object.
7
WR_RD
1
Write transfer
Transfer data from the selected message
buffer registers to the message object
addressed by the command request register
CANIFn_CMDREQ.
0
R/W
31:8
-
-
reserved
0
-
Table 945. CAN message interface command mask registers write direction
(IF2_CMDMSK_W, address 0x400E 2084 (C_CAN0) and 0x400A 4084 (C_CAN1))
bit description
Bit
Symbol
Value
Description
Reset
value
Access
0
DATA_B
Access data bytes 4-7
0
R/W
0
Data bytes 4-7 unchanged.
1
Transfer data bytes 4-7 to message object.
1
DATA_A
Access data bytes 0-3
0
R/W
0
Data bytes 0-3 unchanged.
1
Transfer data bytes 0-3 to message object.
2
TXRQST
Access transmission request bit
0
R/W
0
No transmission request. TXRQSRT bit
unchanged in IF1/2_MCTRL.
Remark:
If a transmission is requested by
programming this bit, the TXRQST bit in the
CANIFn_MCTRL register is ignored.
1
Request a transmission. Set the TXRQST bit
IF1/2_MCTRL.
3
CLRINTPND
-
This bit is ignored in the write direction.
0
R/W
4
CTRL
Access control bits
0
R/W
0
Control bits unchanged.
1
Transfer control bits to message object
5
ARB
Access arbitration bits
0
R/W
0
Arbitration bits unchanged.
1
Transfer Identifier, DIR, XTD, and MSGVAL
bits to message object.
Table 944. CAN message interface command mask registers write direction
(IF1_CMDMSK_W, address 0x400E 2024 (C_CAN0) and 0x400A 4024 (C_CAN1))
bit description
…continued
Bit
Symbol
Value
Description
Reset
value
Access