> There are also some guidelines in
> http://ww1.microchip.com/downloads/en/DeviceDoc/41215B.pdf
>
> Tip #10
>
> They say that the output will be limited to 1/2 of the output of the
output
> from the oscillator.

Thanks, sure I've seen something else in a Tips 'n' Tricks with regard
to a PIC boosting its own Vcc

> > Say you have a 100uF capacitor at 5.0V. The RC time constant
> > is 132R * 0.0001F = 1.32ms, 5 times which is what you would
> > allow to get the voltage up

BTW, that's from a 0V standing start. The cap is already at 3V3

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