Teensy voltage conversion question

Hello,

This might be a very obvious and simple question, but I haven't been able to find the answer via searching.

Teensy++ 2.0 runs on 5v by default. There's a way to convert it to 3.3v, so it draws less power. If I do that, will the 5v pin become a 3v pin or will it only affect the operating frequency of the processor itself?

More specifically, I have a PS/2 keyboard running with Teensy++ 2.0, which requires 5v. Will I be able to power it from Teensy's 5v pin or will the power drop down to 3v and I won't be able to use it?

Thanks.

The teensy can't generate 5v from 3.3v. So no.

Allan

Got it, thanks.