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'Unused I/O pins'
1998\05\03@033502 by Dave Celsnak

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Piclisters!
My next question deals with unused PIC I/O pins.  Should they be made
either an input or output (software), left floating or tied to gnd or +5v?

I am unfortunately using a 28 pin 16c63 dedicated to oscillating a single
pin via hardware USART.  Quick additional other question:  Are there any
other PICs available that have hardware USART?

Cya-
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1998\05\03@060300 by White Horse Design

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At 03:33 03/05/98 -0400, you wrote:

>I am unfortunately using a 28 pin 16c63 dedicated to oscillating a single
>pin via hardware USART.  Quick additional other question:  Are there any
>other PICs available that have hardware USART?

PIC16C74A does, as do many others.

(And I'm not going to write them all down for you! Get a databook from your
nearest distributor!)

Regards

Adrian

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1998\05\03@065821 by Morgan Olsson

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At 03:33 1998-05-03 -0400, you wrote:
>Piclisters!
>My next question deals with unused PIC I/O pins.  Should they be made
>either an input or output (software), left floating or tied to gnd or +5v?

As output.

(Floating input may cause input cirquit to draw current if between high and
low, and if you tie an input it might get damaged if there is any program
error that makes it an output)

/Morgan
/  Morgan Olsson, MORGANS REGLERTEKNIK, SE-277 35 KIVIK, Sweden \
\  .....mrtKILLspamspam@spam@iname.com, ph: +46 (0)414 70741; fax +46 (0)414 70331    /

1998\05\03@111705 by David VanHorn

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>Piclisters!
>My next question deals with unused PIC I/O pins.  Should they be made
>either an input or output (software), left floating or tied to gnd or +5v?


I always make them outputs. This is more flexible than making them inputs,
which would require tying them to one logic state or the other. Cmos inputs
left unterminated can draw lots of power, and make transitions whenever they
feel like it, (Just say no)  Since the outputs don't have to be tied, it's
marginally less expensive, and if I have an "oops" and need a pin, it's
right there waiting for me :)

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