LM3S8971 Datasheet, PDF (394/577 Pages) List of Unclassifed Manufacturers – Microcontroller

Controller Area Network (CAN) Module
Register 6: CAN Test (CANTST), offset 0x014
This is the test mode register for self-test and external pin access. It is write-enabled by the Test
bit in the CANCTL register. Different test functions may be combined but when the Tx bit is not
equal to 0x0, it disturbs message transmits.
CAN Test (CANTST)
CAN0 base: 0x4004.0000
Offset 0x014
Type R/W, 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
reserved
Rx
Tx
LBack Silent Basic
reserved
Type RO
RO
RO
RO
RO
RO
RO
RO
RO
R/W
R/W
R/W
R/W
R/W
RO
RO
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bit/Field
31:8
7
6:5
Name
reserved
Rx
Tx
Type
RO
RO
R/W
Reset
0x0000
0
0x0
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.
Receive Observation
Displays the value on the CANnRx pin.
Transmit Control
Overrides control of theCANnTx pin.
Value Description
00 CAN_TX is controlled by the CAN module (default)
01 Sample Point signal driven on the CAN_TX pin
10 CAN_TX drives a Low value
11 CAN_TX drives a High value
4
LBack
R/W
0
Loopback Mode
0: Disabled.
1: Enabled.
3
Silent
R/W
0
Silent Mode
Do not transmit data; monitor the bus. Also known as Bus Monitor mode.
0: Disabled.
1: Enabled.
2
Basic
R/W
0
Basic Mode
0: Disabled.
1: Use CANIF1 registers as transmit buffer, and use CANIF2 registers
as receive buffer.
394
October 01, 2007
Preliminary