In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Peter Van der Zee wrote:

Hi Beau;

What kind of distortion can you tolerate?

I figure to generate a so-so sinewave with a single RC pin PWM can be done with 15 instructions per sine value, and there would need to be an absolute minimum of 8 segments to one sine cycle.....the more the purer the result. So that sounds like 120 instructions at 20 nanoseconds each, for a one cycle total of 2.4 usec. That's only about 400 Khz; quite a ways from your target.

Cheers,

Peter (pjv)

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