Well, how about grounding the person touching the pins?  If this isn't
feasable, you could use an RC filter...

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From: Rob Aerts <rob.aerts@TIP.NL>
To: PICLIST@MITVMA.MIT.EDU
Subject: esd protection
Date: Thursday, December 11, 1997 3:13 PM

hello,

I have one question for all you guys/girls

In a project with a PIC16C84 the inputs can be touched bij fingers,
my question : how can i protect the i/o against ESD charges ?

Kind regards,

Rob Aerts