Datasheet

bus clock (CLK_APB). A number of clock sources can be selected as the source for the asynchronous
GCLK_PTC. The clock source is selected by configuring the Generic Clock Selection ID in the Generic
Clock Control register. For more information about selecting the clock sources, refer to GCLK - Generic
Clock Controller.
The selected clock must be enabled in the Power Manager, before it can be used by the PTC. By default
these clocks are disabled. The frequency range of GCLK_PTC is 400kHz to 4MHz.
Related Links
15. GCLK - Generic Clock Controller
16. PM – Power Manager
36.6 Functional Description
In order to access the PTC, the user must use the Atmel Start QTouch
®
Configurator to configure and link
the QTouch Library firmware with the application software. QTouch Library can be used to implement
buttons, sliders, and wheels in a variety of combinations on a single interface.
Figure 36-5. QTouch Library Usage
Custom Code
Compiler
Link
Application
QTouch
Library
For more information about QTouch Library, refer to the QTouch Library Peripheral Touch Controller User
Guide.
SAM D21 Family
Peripheral Touch Controller (PTC)
© 2018 Microchip Technology Inc.
Datasheet Complete
DS40001882D-page 981