On Wed, Sep 23, 2009 at 9:11 AM, Quintin Beukes <quintin@last.za.net> wrote:

> Further, he confirmed that the MCLR is used as a programming PIN. I'm
> not sure if that is an open input/output. We are performing tests on
> this now.
>

What Olin and others suggested about putting an unused pin to output and
drive them active low is not applicable to this pin. As Jan-Erik pointed out
the VPP/MCLR/RE3 pin can be configured either MCLR or digital input, but not
output. Also there is no internal pull-up for that pin, so no matter if you
use it as MCLR or digital input that pin needs an external circuit anyway.

Tamas


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