Hi Steve,

Thanks for that  ...  I had wondered about both of those options.

I guess if I had perfected the device my decision would be easier, but I can 
see some variations being a possibility.

Thanks again,

Roger



----- Original Message ----- 
From: "Steve Smith" <xygax@blueyonder.co.uk>
To: "'Microcontroller discussion list - Public.'" <piclist@mit.edu>
Sent: Sunday, September 13, 2009 1:54 PM
Subject: RE: [PIC] Unused port lines question


> There are two schools of thought on this and there are valid reasons for
> both.
> 1. Pins to input and tied to a supply line.
> 2. Pins to output with dummy data on them.
>
> If the pins are inputs and tied then when you read the port as a whole you
> will get some absolute data that can be checked against a reference so
> therefore validating the input.
>
> If the pins are outputs then there is always room for expansion / 
> debugging
> connections to other 'Stuff' and can be used on s future enhancement of 
> the
> product for zero cost.
>
> Both have benefits the choice is bipolar...
>
> Steve
>


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