57.6.15.7 Sequence and Noise Filtering

The ADC Controller can manage ADC conversions and touchscreen measurement. On each trigger event the sequence of ADC conversions is performed as described in Sleep Mode and Conversion Sequencer. The touchscreen measure frequency can be specified in number of trigger events by writing the ADC_TSMR.TSFREQ parameter. An internal counter counts triggers up to TSFREQ, and every time it rolls out, a touchscreen sequence is appended to the classic ADC conversion sequence (see figure below).

Additionally the user can average multiple touchscreen measures by writing the ADC_TSMR.TSAV parameter. This can be 1, 2, 4 or 8 measures performed on consecutive triggers as illustrated in the figure below. Consequently, the ADC_TSMR.TSFREQ parameter must be greater than or equal to the ADC_TSMR.TSAV parameter.