Texas Instruments CC2650DK ユーザーズマニュアル
AUX – Sensor Controller Registers
17.8.2.1 CTL Register (Offset = 0h) [reset = X]
CTL is shown in
and described in
Control
Figure 17-10. CTL Register
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
RESERVED
R-X
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
RESERVED
CMD
R-X
W-X
Table 17-29. CTL Register Field Descriptions
Bit
Field
Type
Reset
Description
31-2
RESERVED
R
X
Software should not rely on the value of a reserved. Writing any
other value than the reset value may result in undefined behavior.
other value than the reset value may result in undefined behavior.
1-0
CMD
W
X
TDC command strobes
0h = This command clears STAT.SAT, STAT.DONE and results.
Note: This is not needed as prerequisite for a measurement. Reliable
clear is only guaranteed from IDLE state
Note: This is not needed as prerequisite for a measurement. Reliable
clear is only guaranteed from IDLE state
1h = This command makes the TDC FSM start counting
synchronously to the first rising edge that follows a required falling
edge of the start event. This guarantees an edge triggered start and
is recommended for frequency measurements. A falling edge of the
start event may be missed if the command is issued close to it in
time, but the TDC will catch later falling edges and guarantee that a
measurement starts synchronously to the rising edge of the start
event
synchronously to the first rising edge that follows a required falling
edge of the start event. This guarantees an edge triggered start and
is recommended for frequency measurements. A falling edge of the
start event may be missed if the command is issued close to it in
time, but the TDC will catch later falling edges and guarantee that a
measurement starts synchronously to the rising edge of the start
event
2h = This command makes the TDC FSM start and stop counting
asynchronously. TDC measurement may start immediately if start is
high and hence it may not give precise edge to edge measurements.
Only recommended when start pulse is guaranteed to arrive at least
7 clock periods after the command
asynchronously. TDC measurement may start immediately if start is
high and hence it may not give precise edge to edge measurements.
Only recommended when start pulse is guaranteed to arrive at least
7 clock periods after the command
3h = This command forces the TDC back to IDLE state
1222
AUX – Sensor Controller with Digital and Analog Peripherals
SWCU117A – February 2015 – Revised March 2015
Copyright © 2015, Texas Instruments Incorporated