LM3S5632 Luminary Micro, Inc, LM3S5632 Datasheet - Page 514

• Manufacturer Part Number: LM3S5632
• Description: Lm3s5632 Arm Microcontroller
• Manufacturer: Luminary Micro, Inc

Reset
Reset
Type
Type
Controller Area Network (CAN) Module
CAN IF1 Command Request (CANIF1CRQ)
CAN0 base: 0x4004.0000
Offset 0x020
Type R/W, reset 0x0000.0001
514
Bit/Field
31:16
14:6
5:0
Busy
15
RO
RO
31
15
0
0
RO
RO
Register 8: CAN IF1 Command Request (CANIF1CRQ), offset 0x020
Register 9: CAN IF2 Command Request (CANIF2CRQ), offset 0x080
This register is used to start a transfer when its MNUM bit field is updated. Its Busy bit indicates that
the information is transferring from the CAN Interface Registers to the internal message RAM.
A message transfer is started as soon as there is a write of the message object number with the
MNUM bit. With this write operation, the Busy bit is automatically set to 1 to indicate that a transfer
is in progress. After a wait time of 3 to 6 CAN_CLK periods, the transfer between the interface register
and the message RAM completes, which then sets the Busy bit back to 0.
30
14
0
0
RO
RO
29
13
reserved
reserved
0
0
MNUM
Name
Busy
RO
RO
28
12
0
0
RO
RO
27
11
0
0
Type
R/W
RO
RO
RO
reserved
RO
RO
26
10
0
0
0x0000
RO
RO
Reset
25
0x00
0x01
0
9
0
0x0
Preliminary
RO
RO
24
0
8
0
reserved
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.
Busy Flag
0: Reset when read/write action has finished.
1: Set when a write occurs to the message number in this register.
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.
Message Number
Selects one of the 32 message objects in the message RAM for data
transfer. The message objects are numbered from 1 to 32.
Value
0x00
0x01-0x20
0x21-0x3F
RO
RO
23
0
7
0
Description
0 is not a valid message number; it is interpreted as 0x20,
or object 32.
Indicates specified message object 1 to 32.
Not a valid message number; values are shifted and it is
interpreted as 0x01-0x1F.
RO
RO
22
0
6
0
R/W
RO
21
0
5
0
R/W
RO
20
0
4
0
R/W
RO
19
0
3
0
MNUM
R/W
RO
18
0
2
0
R/W
RO
17
0
1
0
June 02, 2008
R/W
RO
16
0
0
1