NUC970 Technical Reference Manual
Publication Release Date: Dec. 15, 2015
- 809 -
Revision V1.30
NUC97
0
T
E
CHNIC
A
L
RE
F
E
RE
N
CE
MA
NUA
L
Test Register (CAN_TEST)
Register
Offset
R/W
Description
Reset Value
CAN_TEST
0x14
R/W
Test Register
0x0000_00x0
31
30
29
28
27
26
25
24
Reserved
23
22
21
20
19
18
17
16
Reserved
15
14
13
12
11
10
9
8
Reserved
7
6
5
4
3
2
1
0
Rx
Tx[1:0]
LBack
Silent
Basic
Res
Bits
Description
[31:8]
Reserved
Reserved.
[7]
Rx
Monitors the Actual Value of CAN_RX Pin (Read Only)
0 = The CAN bus is dominant (CAN_RX = ‘0’).
1 = The CAN bus is recessive (CAN_RX = ‘1’).
[6:5]
Tx[1:0]
Tx[1:0]: Control of CAN_TX Pin
00 = Reset value, CAN_TX is controlled by the CAN Core.
01 = Sample Point can be monitored at CAN_TX pin.
10 = CAN_TX pin drives a dominant (‘0’) value.
11 = CAN_TX pin drives a recessive (‘1’) value.
[4]
LBack
Loop Back Mode Enable Control
0 = Loop Back Mode is disabled.
1 = Loop Back Mode is enabled.
[3]
Silent
Silent Mode
0 = Normal operation.
1 = The module is in Silent Mode.
[2]
Basic
Basic Mode
0 = Basic Mode disabled.
1= IF1 Registers used as Tx Buffer, IF2 Registers used as Rx Buffer.
[1:0]
Reserved
Reserved.
Reset value: 0000 0000 R000 0000 b (R:current value of RX pin)
Write access to the Test Register is enabled by setting the Test bit in the CAN Control Register. The
different test functions may be combined, but Tx[1-
0] “00” disturbs message transfer.