LM3S9792 Datasheet, PDF (792/1279 Pages) Texas Instruments – Stellaris® LM3S9792 Microcontroller

Controller Area Network (CAN) Module
Register 6: CAN Test (CANTST), offset 0x014
This register is used for self-test and external pin access. It is write-enabled by setting the TEST bit
in the CANCTL register. Different test functions may be combined, however, CAN transfers are
affected if the TX bits in this register are not zero.
CAN Test (CANTST)
CAN0 base: 0x4004.0000
CAN1 base: 0x4004.1000
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
Name
reserved
RX
Type
RO
RO
Reset Description
0x0000.00 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.
0
Receive Observation
Value
0
1
Description
The CANnRx pin is low.
The CANnRx pin is high.
6:5
TX
R/W
0x0
Transmit Control
Overrides control of the CANnTx pin.
Value
0x0
0x1
0x2
0x3
Description
CAN Module Control
CANnTx is controlled by the CAN module; default
operation
Sample Point
The sample point is driven on the CANnTx signal. This
mode is useful to monitor bit timing.
Driven Low
CANnTx drives a low value. This mode is useful for
checking the physical layer of the CAN bus.
Driven High
CANnTx drives a high value. This mode is useful for
checking the physical layer of the CAN bus.
792
June 14, 2010
Texas Instruments-Advance Information