>
As I underatand it, the original s-board was designed before the
later crop of oopic chips that dedicate I/O lines 22+23 for RS232
UART.
So, when you plug a version II or III chip into the board, you should
not try using those pins for anything else besides RS232. Use some
other pins.
Also, it's best to reserve I/O lines 1-7 for A/D channels, and not
use them for digital I/O, as there are some allocation problems when
trying to use some of those lines for A/D and others for digital I/O.
> Thanks, I do realize that the pins and I/O's are not
> the same. I did not have a schematic with the pin #'s
> in front of me. Those pins are 35, 37 and 39
> respectively.
>
> So what you are trying to say second then, is that
> this is normal operation for the oopic? Then what
> about I/O 21, is it independent or is it also tied
> into the internal RS232?
>
> Do you know of better a schematic that shows this for
> the oopic-s board?
>
> --- dan michaels <oric_dan@...> wrote:
>
> > --- In oopic@yahoogroups.com, "drjack199"
> > <drjack199@> wrote:
> > >
> >
> >
> > First, distinquish between cpu pin #'s 21, 22, 23
> > and oopic-assigned
> > I/O lines 21, 22, 23. They're not the same, in case
> > you didn't
> > realize it.
> >
> > Secondly, do not try to use oopic I/O lines 22+23
> > for regular I/O,
> > because they are connected to the internal RS232
> > UART.
> >
> >
> >
> >
> >
> >
> > > I am using the oopic III+ and am experiencing a
> > problem with I/O's
> > 21,
> > > 22, 23. I test each I/O using the LED program,
> > the program is the
> > one
> > > from the oopic webpage (Chapter 2 - Your first
> > ooic application).
> > I
> > > like to do this to make sure the oopic is working
> > properly, saves
> > me
> > > the headache down the line. I did this test I
> > found that I/O 23
> > never
> > > has an output, when 21 is powered 21 and 22 have
> > an output, but
> > when
> > > just 22 is tested only 22 outputs a signal. Not
> > sure what the
> > problem
> > > is but these are the only 3 ports with a problem.
> > Is there a
> > hardware
> > > issue, a firmware issue or is this a normal
> > operation for the
> > oopic.
> > > I don't believe that the last one is proper but
> > just have to
> > check.
> > > It was suggested that ths maybe how it operates,
> > but I don't
> > believe
> > > that.
> > >
> >
> >
> >
>
>
>
>
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