UM10503
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© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
1090 of 1269
NXP Semiconductors
UM10503
Chapter 42: LPC43xx C_CAN
42.6.3.3 CAN new data 1 register
This register contains the NEWDAT bits of message objects 16 to 1. By reading out the
NEWDAT bits, the CPU can check for which Message Object the data portion was
updated. The NEWDAT bit of a specific Message Object can be set/reset by the CPU via
the IFx Message Interface Registers or by the Message Handler after reception of a Data
Frame or after a successful transmission.
42.6.3.4 CAN new data 2 register
This register contains the NEWDAT bits of message objects 32 to 17. By reading out the
NEWDAT bits, the CPU can check for which Message Object the data portion was
updated. The NEWDAT bit of a specific Message Object can be set/reset by the CPU via
the IFx Message Interface Registers or by the Message Handler after reception of a Data
Frame or after a successful transmission.
42.6.3.5 CAN interrupt pending 1 register
This register contains the INTPND bits of message objects 16 to 1. By reading out the
INTPND bits, the CPU can check for which Message Object an interrupt is pending. The
INTPND bit of a specific Message Object can be set/reset by the CPU via the IFx
Message Interface Registers or by the Message Handler after reception or after a
successful transmission of a frame. This will also affect the value of INTPND in the
Interrupt Register.
Table 968. CAN new data 1 register (ND1, address 0x400E 2120 (C_CAN0) and 0x400A 4120
(C_CAN1)) bit description
Bit
Symbol
Description
Reset
value
Access
15:0
NEWDAT16_1
New data bits of message objects 16 to 1.
0 = No new data has been written into the data portion
of this Message Object by the Message Handler since
last time this flag was cleared by the CPU.
1 = The Message Handler or the CPU has written new
data into the data portion of this Message Object.
0x00
R
31:16
-
Reserved
-
-
Table 969. CAN new data 2 register (ND2, address 0x400E 2124 (C_CAN0) and 0x400A 4124
(C_CAN1)) bit description
Bit
Symbol
Description
Reset
value
Access
15:0
NEWDAT32_17
New data bits of message objects 32 to 17.
0 = No new data has been written into the data
portion of this Message Object by the Message
Handler since last time this flag was cleared by the
CPU.
1 = The Message Handler or the CPU has written
new data into the data portion of this Message
Object.
0x00
R
31:16
-
Reserved
-
-