My $0.02
I am working with a single pcb layout at present that covers a line of
products, minor differences in components and microcontroller code and what
is externally connected and viola a new and different product.
I personally leave the unused pins programmed as inputs / outputs depending
on their normal usage, the unused inputs are either tied high or low via a
10k or so resistor.
For example one of the inputs normally comes from another device whos output
is an npn open collector configuration, the pull-up resistor on my pcb will
prevent oscilation even if that function is not being used.
The important thing to remember here is not to directly ground any "unused"
pin.

Lonnie - KF4HAZ -

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