unused pins

Archiver

Hello stampers,

I'm using a BS2 in a project, programming the stamp is done on a demo board
so when the stamp is "in production", some of the io pins are unused.

What do I do with these pins, especially the TX, RX and ATN pin, I know the
reset is internally pulled high.

Do I leave these pins unconnected or pull them high / low?

Thanks in advance

Met vriendelijke groetjes,

> ************************************************
> Michel De Meester
> Biotechnisch Onderhoud
> Universitair Ziekenhuis Antwerpen
> Wilrijkstraat 10
> 2650 Edegem - B
> tel: ++32 (0)3 821 36 47
> e-mail: michel.de.meester@u...
>
> *************************************************
>
>

Archiver

>I'm using a BS2 in a project, programming the stamp is done on a demo board
>so when the stamp is "in production", some of the io pins are unused.
>
>What do I do with these pins, especially the TX, RX and ATN pin, I know the
>reset is internally pulled high.
>
>Do I leave these pins unconnected or pull them high / low?

I'd leave TX and RX unconnected, and tie ATN to ground via a resistor
(~5k). Ohterwise, ATN may be subject to noise. Bring those pins to
and ground to a row of 4 small holes in the production board, so you
can still upgrade the project with new firmware if that becomes
necessary!