On Mon, Jun 21, 2004 at 01:03:35AM -0500, rad0 wrote:
> When making a pcb, should you tie the unused pins directly to
> ground,

Absolutely not! Ouch! If for whatever reason the software ever sets that pin
to a high output, then you've just blown your output buffer.

> or should it be through a resistor?

If necessary use a resistor. And then one that will draw less than 20ma of
current. In this case you probably want to leave this I/O pin as an input.

>
> Memory is failing...thanks.
>
> Or what is the proper procedure or good practice?

Good practice is to leave the pin open, preferably wired to a short open
pad just in case you ever need it. Then in your software you set the pin to
an output. That's all that's required.

BAJ

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