r5f21368sdfp Renesas Electronics Corporation., r5f21368sdfp Datasheet - Page 645

• Manufacturer Part Number: r5f21368sdfp
• Description: Renesas Mcu R8c Family / R8c/3xt-a Series
• Manufacturer: Renesas Electronics Corporation.

Under development
R8C/36T-A Group
R01UH0240EJ0001 Rev.0.01
Apr 28, 2011
25.4
Figure 25.11
Figure 25.11 shows the Measurement Circuit Section. The measurement operation principle of the sensor touch
control unit is explained below.
As shown in Figure 25.11, the operation is described with resistors and capacitors inserted.
Either CHxA0 or CHxA1 can be selected by bits CHXAS00 to CHXAS08, CHXAS10, CHXAS11, CHXAS16 to
CHXAS25, CHXAS27, CHXAS28, and CHXAS31 to CHXAS35 in registers TSCHSEL0 to TSCHSEL2 for each
channel.
Va0
Principle of Measurement Operation
Va1
Preliminary document
Specifications in this document are tentative and subject to change.
Measurement Circuit Section
Vc
Cr0
Cr1
Rc
Cc
CHxA0
CHxA1
CHxB
CHxC
Cr0: Capacitor 0 for comparison
Cr1: Capacitor 1 for comparison
Cx: Floating capacitance of the touch electrode
Rc: Resistor to control charge and discharge
Cc: Capacitor for charge and discharge
Rr: Protective resistor
Rr
25. Sensor Control Unit
CHx
Page 614 of 725
Cx