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 setting the
TESTbit in the CANCTL register. Different test functions may be combined, however, CAN transfers
will be affected if the TX bits in this register are not zero.
CAN Test (CANTST)
CAN0 base: 0x4004.0000
CAN1 base: 0x4004.1000
CAN2 base: 0x4004.2000
Offset 0x014
Type R/W, reset 0x0000.0000
16171819202122232425262728293031
reserved
ROROROROROROROROROROROROROROROROType
0000000000000000Reset
0123456789101112131415
reservedBASICSILENTLBACKTXRXreserved
ROROR/WR/WR/WR/WR/WROROROROROROROROROType
0000000000000000Reset
DescriptionResetTypeNameBit/Field
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.
0x0000.00ROreserved31:8
Receive Observation
Displays the value on the CANnRx pin.
0RORX7
Transmit Control
Overrides control of the CANnTx pin.
DescriptionValue
CAN Module Control
CANnTx is controlled by the CAN module; default
operation
0x0
Sample Point
The sample point is driven on the CANnTx signal. This
mode is useful to monitor bit timing.
0x1
Driven Low
CANnTx drives a low value. This mode is useful for
checking the physical layer of the CAN bus.
0x2
Driven High
CANnTx drives a high value. This mode is useful for
checking the physical layer of the CAN bus.
0x3
0x0R/WTX6:5
Loopback Mode
0: Disabled.
1: Enabled. In loopback mode, the data from the transmitter is routed
into the receiver. Any data on the receive input is ignored.
0R/WLBACK4
June 22, 2010394
Texas Instruments-Production Data
Controller Area Network (CAN) Module