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UM10503
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© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
1075 of 1269
NXP Semiconductors
UM10503
Chapter 42: LPC43xx C_CAN
[1]
When a message number that is not valid is written into the Command request registers, the message
number will be transformed into a valid value and that message object will be transferred.
[1]
When a message number that is not valid is written into the Command request registers, the message
number will be transformed into a valid value and that message object will be transferred.
Table 942. CAN message interface command request registers (IF1_CMDREQ, address
0x400E 2020 (C_CAN0) and 0x400A 4020 (C_CAN1)) bit description
Bit
Symbol
Description
Reset
value
Access
5:0
Message Number Message number
0x01 to 0x20 = Valid message numbers
The message object in the message RAM is
selected for data transfer.
0x00 = Not a valid message number. This
value is interpreted as 0x20.
0x21 to 0x3F = Not a valid message number.
This value is interpreted as 0x01 - 0x1F.
0x01
R/W
14:6
-
Reserved
15
BUSY
BUSY flag
0
R
Set to one by hardware when writing to this
Command request register.
Set to zero by hardware when read/write
action to this Command request register has
finished.
31:16
-
Reserved
-
-
Table 943. CAN message interface command request registers (IF2_CMDREQ, address
0x400E 2080 (C_CAN0) and 0x400A 4080 (C_CAN1)) bit description
Bit
Symbol
Description
Reset
value
Access
5:0
Message Number Message number
0x01 to 0x20 = Valid message numbers
The message object in the message RAM is
selected for data transfer.
0x00 = Not a valid message number. This
value is interpreted as 0x20.
0x21 to 0x3F = Not a valid message number.
This value is interpreted as 0x01 - 0x1F.
0x01
R/W
14:6
-
Reserved
15
BUSY
BUSY flag
0
R
Set to one by hardware when writing to this
Command request register.
Set to zero by hardware when read/write
action to this Command request register has
finished.
31:16
-
Reserved
-
-