Touch controller architecture

A touch controller comprising:

• drive circuitry configurable to generate stimulation signals to drive a touch sensor panel;
• and
• sense circuitry configurable to sense the touch sensor panel;
• wherein:
• the drive circuitry and sense circuitry are configured according to a scan plan defining a sequence of scan events including a first scan event and a second scan event to be performed at least partially concurrently at the touch sensor panel, the first scan event including a mutual capacitance scan or a self capacitance scan, and the second scan event including a stylus scan;
• for the first scan event, the drive circuitry is configured to generate first stimulation signals at one or more first frequencies to drive the touch sensor panel and the sense circuitry is configured to sense the touch sensor panel to sense an object touching or in proximity to the touch sensor panel using the first stimulation signals;
• and
• for the second scan event, the sense circuitry is configured to sense the touch sensor panel to sense a stylus touching or in proximity to the touch sensor panel using second stimulation signals generated by the stylus at one or more second frequencies different than the one or more first frequencies.