pw does not affect phase length
in my understanding, pw controlls the RATIO of the length of the two values of a square wave. the length of the whole phase is constant! pw determines when (within one phase cycle) the square wave switches its value. the frequency (which is the phase length) stays the same, only the point of time when the square goes through zero varies. Of course, the square goes through zero at every beginning of a phase cycle also.
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