R01UH0823EJ0100 Rev.1.00 Page 1509 of 1823
Jul 31, 2019
RX23W Group 43. Capacitive Touch Sensing Unit (CTSU)
CTSURICOA[7:0] Bits (CTSU Reference ICO Current Adjustment)
These bits adjust the oscillation frequency using the input current of the reference ICO.
CTSUSDPA[4:0] Bits (CTSU Base Clock Setting)
These bits are used to generate a base clock used as the source for the sensor drive pulse by dividing the operating clock.
For details on the setting procedure, refer to
section 43.3.2.1, Initial Setting Flowchart.
CTSUICOG[1:0] Bits (CTSU ICO Gain Adjustment)
These bits adjust the output frequency gain of the sensor ICO and the reference ICO. Normally, the value of these bits
should be set to 00b for the maximum gain. If changes in the capacitance between when the electrode is touched and
when it is not touched greatly exceed the dynamic range of the sensor ICO, set the gain adjustment bits to adjust the gain
appropriately.
43.2.16 CTSU Sensor Counter (CTSUSC)
Read first from the CTSUSC counter and then the CTSURC counter after a CTSURD interrupt is generated.
CTSUSC[15:0] Bits (CTSU Sensor Counter)
These bits are configured as an increment counter that counts the sensor ICO clock.
Read these bits after a CTSURD interrupt is generated. After the CTSURC counter is read, these bits are cleared
immediately before the CTSU measurement status counter value changes to Status 4 (the CTSUST.CTSUSTC[2:0] flags
changes to 100b) in the next measurement. These bits are also cleared using the CTSUCR0.CTSUINIT bit.
Address(es): CTSU.CTSUSC 000A 0918h
b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
CTSUSC[15:0]
Value after reset:
0000000000000000
Bit Symbol Bit Name Description R/W
b15 to b0 CTSUSC[15:0] CTSU Sensor Counter These bits indicate FFFFh when an overflow occurs. R
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