17.4.4 CVD Mutual Capacitance Pins

The CVDTXx pins, together with CVDANx pins, can form mutual capacitance sensors. The CVDTXx waveform should follow CVD levels on the CVDANx pin to induce the mutual capacitance. The active CVDTXx are selected in the ITCTXA, ITCTXB and ITCTXC registers.

The pins selected in ITCTXA are controlled by the PCA[1:0] bits in the acquisition commands, the pins selected in ITCTXB are controlled by the PCB[1:0] bits in the acquisition commands, and the pins selected in ITCTXC are controlled by the PCC[1:0] bits in the acquisition sequence commands.

The content (active CVDTXx pins) of ITCTXA, ITCTXB and ITCTXC registers can be updated by DMA triggered from the acquisition sequence.