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'[PIC]: input/outputs'
2000\09\06@055622 by brah

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face
brah wrote:
>
>         I've read the discussions re port registers and latches where care has
> to be taken, and I've noted the necessities.
>         However, I wonder if it is common, or even regular, to swap a pin from
> input to output and back again repeatedly every mS or so....etc.
       Thanks to all who replied. Now I know I'm not doing something I perhaps
shouldn't, I shall go and nut it out.

        Regards to all
                Howard.

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'[EE:] Muxing 8 lines to separate input/outputs'
2004\07\26@225237 by roines reenig
picon face
Hi all,

I've got 16 lines of GPIO on a board that I'm
designing. These lines are software I or O selectable.
I need to route these lines to an on-board header (to
connect it to an external connector in case I change
the enclosure in future) as well as a fixed set of
on-board LED blocks and SPDT buttons. I want to use a
jumper or a DIP switch to select whether the lines are
connected to the on-board header or whether they get
connected to the LED/buttons. Currently, I'm thinking
of having a 16 button DIP switch. But that'd be a
fairly high penalty in terms of board area.

I figure there's gotta be a better way to do this.
Here's an ascii diagram of the magic blob I'm looking
for. I can't use a MUX because the pins can be
input/output type.

                  -HDRS--
                  |||||||
                  |||||||
IO0----------------|||||||------------LED0
IO1----------------|magic|------------LED1
IO2----------------||blob|------------SW0
IOx----------------|||||||------------SWn
                     |
selection.............^

Anyone have any advice?

Thanks,
Roines





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2004\07\27@175639 by Matthew Brush

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roines reenig wrote:

>I figure there's gotta be a better way to do this.
>Here's an ascii diagram of the magic blob I'm looking
>for. I can't use a MUX because the pins can be
>input/output type.
>
>
>
http://www.philipslogic.com/products/switches/4066/

The 4066 analog switch ought to do the trick.  They are made by many
manufacturers and pretty cheap.  You  could tie the control lines
together and switch them all at once with one jumper or dip switch or
whatever.

An idea anyway.  Good luck, Cheers!

MJ Brush

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2004\07\29@154544 by Wouter van Ooijen

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> I can't use a MUX because the pins can be
> input/output type.

analog mux?

you can use a single header or switch to isolate the LEDs, same for the
switches if you include a diode for each switch.

Wouter van Ooijen

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