LM3S2918 Luminary Micro, Inc, LM3S2918 Datasheet - Page 450
LM3S2918
Manufacturer Part Number
LM3S2918
Description
Lm3s2918 Arm Microcontroller
Manufacturer
Luminary Micro, Inc
Datasheet
1.LM3S2918.pdf
(533 pages)
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Reset
Reset
Type
Type
Controller Area Network (CAN) Module
CAN New Data 1 (CANNWDA1)
CAN0 base: 0x4004.0000
Offset 0x120
Type RO, reset 0x0000.0000
450
Bit/Field
31:16
15:0
RO
RO
31
15
0
0
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
CAN IFn Message Control (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 bit of the first 16 message objects in the message
RAM; the CANNWDA2 register contains the NewDat bit of the second 16 message objects.
RO
RO
30
14
0
0
reserved
RO
RO
NewDat
29
13
0
0
Name
RO
RO
28
12
0
0
RO
RO
27
11
0
0
Type
RO
RO
RO
RO
26
10
0
0
0x0000
Reset
0x00
RO
RO
25
0
9
0
Preliminary
RO
RO
24
0
8
0
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
(of all message objects)
0: No new data has been written into the data portion of this message
object by the message handler since the 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.
reserved
NewDat
RO
RO
23
0
7
0
RO
RO
22
0
6
0
RO
RO
21
0
5
0
RO
RO
20
0
4
0
RO
RO
19
0
3
0
RO
RO
18
0
2
0
July 26, 2008
RO
RO
17
0
1
0
RO
RO
16
0
0
0
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