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UM10503
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
1258 of 1441
NXP Semiconductors
UM10503
Chapter 45: LPC43xx/LPC43Sxx C_CAN
45.6.2.4.6
CAN message interface data A1 registers
In a CAN Data Frame, DATA0 is the first, DATA7 (in CAN_IF1B2 AND CAN_IF2B2) is the
last byte to be transmitted or received. In CAN’s serial bit stream, the MSB of each byte
will be transmitted first.
Remark:
Byte DATA0 is the first data byte shifted into the shift register of the CAN Core
during a reception, byte DATA7 is the last. When the Message Handler stores a Data
Frame, it will write all the eight data bytes into a Message Object. If the Data Length Code
is less than 8, the remaining bytes of the Message Object will be overwritten by non
specified values.
13
INTPND
Interrupt pending
0
R/W
0
This message object is not the source of an
interrupt.
1
This message object is the source of an
interrupt. The Interrupt Identifier in the Interrupt
Register will point to this message object if there
is no other interrupt source with higher priority.
14
MSGLST
Message lost (only valid for message objects in
the direction receive).
0
R/W
0
No message lost since this bit was reset last by
the CPU.
1
The Message Handler stored a new message
into this object when NEWDAT was still set, the
CPU has lost a message.
15
NEWDAT
New data
0
R/W
0
No new data has been written into the data
portion of this message object by the message
handler since this flag was cleared last by the
CPU.
1
The message handler or the CPU has written
new data into the data portion of this message
object.
31:16 -
-
Reserved
0
-
Table 1060.CAN message interface message control registers (IF2_MCTRL, address
0x400E 2098 (C_CAN0) and 0x400A 4098 (C_CAN1)) bit description
…continued
Bit
Symbol
Value
Description
Reset
value
Access
Table 1061.CAN message interface data A1 registers (IF1_DA1, address 0x400E 203C
(C_CAN0) and 0x400A 403C (C_CAN1)) bit description
Bit
Symbol Description
Reset value
Access
7:0
DATA0
Data byte 0
0x00
R/W
15:8
DATA1
Data byte 1
0x00
R/W
31:16
-
Reserved
-
-