Are there any Mega or Xmega parts with a built-in numerically controlled oscillator NCO (along the lines of Microchip 16F devices). I need to generate various approx 75KHz square waves with tight freq adjusting resolution of a few Hz. Using a timer divider does not cut it, since the step size is huge. I need to step in much smaller steps.
I took a look at the parts & did not see any, but perhaps I overlooked something.