On Fri, Feb 20, 2004 at 07:54:13AM -0600, rad0 wrote:
> Regarding MCLR, is the main purpose of this pin
> to be used as a reset function?

Yes, it's the reset pin.

> What else is this used for?

On the 12F629, it can also be a general-purpose input.

> I wasn't going to use MCLR and was wondering
> if it is alright to leave it unconnected?

If it's configured as MCLR, it needs to be pulled high.

> In fact, I'm only going to use two pins and I
> was wondering if it's OK to leave all the unused
> pins unconnected?
>
> Or is there some other standard practice?

Usually held low or high through a resistor.  See
http://www.piclist.com/techref/logic/xtrapins.htm

Chris

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