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AUX – Sensor Controller Registers
17.8.2.9 PRECTL Register (Offset = 20h) [reset = X]
PRECTL is shown in
and described in
Prescaler Control The prescaler can be used to count events that are faster than the AUX clock speed. It
can be used standalone or as a start/stop source for the TDC by configuring TRIGSRC.START_SRC and
TRIGSRC.STOP_SRC to TDC_PRE. When counting fast signals with the TDC that are faster than 1/10th
of the clock frequency of AUX it is recommended to use the prescaler.
can be used standalone or as a start/stop source for the TDC by configuring TRIGSRC.START_SRC and
TRIGSRC.STOP_SRC to TDC_PRE. When counting fast signals with the TDC that are faster than 1/10th
of the clock frequency of AUX it is recommended to use the prescaler.
Figure 17-18. PRECTL Register
31
30
29
28
27
26
25
24
RESERVED
R-X
23
22
21
20
19
18
17
16
RESERVED
R-X
15
14
13
12
11
10
9
8
RESERVED
R-X
7
6
5
4
3
2
1
0
RESET_N
RATIO
RESERVED
SRC
R/W-X
R/W-X
R-X
R/W-1Fh
Table 17-37. PRECTL Register Field Descriptions
Bit
Field
Type
Reset
Description
31-8
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.
7
RESET_N
R/W
X
Prescaler reset control 0: Prescaler is held in reset 1: Prescaler is
not held in reset
not held in reset
6
RATIO
R/W
X
Prescaler ratio. This controls how often an event is generated on the
TDC_PRE line. After the prescaler is reset the event output
TDC_PRE is 0.
TDC_PRE line. After the prescaler is reset the event output
TDC_PRE is 0.
0h = Prescaler divides by 16. A rising edge on the output is
generated for every 16 rising edges of the input (the output toggles
on every 8th rising edge of the input).
generated for every 16 rising edges of the input (the output toggles
on every 8th rising edge of the input).
1h = Prescaler divides by 64. A rising edge on the output is
generated for every 64 rising edges of the input (the output toggles
on every 32th rising edge of the input). .
generated for every 64 rising edges of the input (the output toggles
on every 32th rising edge of the input). .
5
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.
1232
AUX – Sensor Controller with Digital and Analog Peripherals
SWCU117A – February 2015 – Revised March 2015
Copyright © 2015, Texas Instruments Incorporated