LM3S5D56 Datasheet, PDF (800/1146 Pages) Texas Instruments – Stellaris® LM3S5D56 Microcontroller

Controller Area Network (CAN) Module
Register 32: CAN New Data 1 (CANNWDA1), offset 0x120
Register 33: CAN New Data 2 (CANNWDA2), offset 0x124
The CANNWDA1 and CANNWDA2 registers hold the NEWDAT bits of the 32 message objects. By
reading these bits, the CPU can check which message object has its data portion updated. The
NEWDAT bit of a specific message object can be changed by three sources: (1) the CPU via the
CANIFnMCTL register, (2) the message handler state machine after the reception of a data frame,
or (3) the message handler state machine after a successful transmission.
The CANNWDA1 register contains the NEWDAT bits of the first 16 message objects in the message
RAM; the CANNWDA2 register contains the NEWDAT bits of the second 16 message objects.
CAN New Data 1 (CANNWDA1)
CAN0 base: 0x4004.0000
Offset 0x120
Type RO, reset 0x0000.0000
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
reserved
Type RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
NEWDAT
Type RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bit/Field
31:16
15:0
Name
reserved
NEWDAT
Type
RO
RO
Reset
0x0000
0x0000
Description
Software should not rely on the value of a reserved bit. To provide
compatibility with future products, the value of a reserved bit should be
preserved across a read-modify-write operation.
New Data Bits
Value
0
1
Description
No new data has been written into the data portion of the
corresponding message object by the message handler since
the last time this flag was cleared by the CPU.
The message handler or the CPU has written new data into
the data portion of the corresponding message object.
800
January 23, 2012
Texas Instruments-Production Data