Counter bits
Dvolt control bits
Filter bits
Figure 35-10. Block diagram automatic noise threshold operation
The signals that have different behavior in this noise mode (wrt capacitive mode) are
shown in the following table.
Table 35-3. Signal properties in automatic noise operation mode
Name
Function
I/O type
Power Up/Reset state
MODE[3:2]
11—Noise mode operation
with frequency limitation and
automatic threshold counter.
I
00
EXTCHRG[2:1]
In this operation mode, these
bits select the number of filter
bits.
00—3 filter bits
01—2 filter bits
10—1 filter bit
11—no filter bit
I
00
EXTCHRG[0]
In this operation mode, this bit
selects the series resistance.
0—uses Rs=32 kΩ
1—uses Rs=187 kΩ
Independent of this bit
selection, the threshold 15 is
done with Rs = 5.5 kΩ
I
0
Table continues on the next page...
Chapter 35 Touch Sensing Input (TSI)
MKW01Z128 MCU Reference Manual, Rev. 3, 04/2016
Freescale Semiconductor, Inc.
709
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