29.6.5 Operations in Mutual Capacitance

A mutual capacitance sensor is formed between two I/O lines, a PTC_X electrode for transmitting, and a PTC_Y electrode for receiving. The mutual capacitance between the PTC_X and PTC_Y electrodes is calibrated and measured by the PTC. It is not necessary to connect all X and Y lines; when unused, they can be left unconnected.