Re: Slightly OT: Up/Down-Counter, easy interfaceable to 8-bit MPU

From: John/Lori (
Date: 2004-05-03 22:47:22

Spiro Trikaliotis wrote:
> Hello Rainer,
> * On Mon, May 03, 2004 at 03:17:12PM +0200 Rainer Buchty wrote:
> > > Yes, I fear this to be true. :-(
> >
> > There's nothing to fear... If space is such an issue, get something really
> > small like the M4-32/32 in 48TQFP. Free software from Lattice and
> > in-circuit programmable, so no big deal.
> Yes, but it's more work than using an existing chip for this. If only
> the 6522/6526 would have counters instead of timers.
> It is too much work compared with a software solution, so my collegues
> will vote for the software solution although they already *know* that
> this will leave out some countings, it is too unreliable.
> We don't have the time to work on a programmable device for this.

It may not be as much work as you expect.

If they don't have what you want in a library (and it wouldn't suprise
me if they do, though I don't specifically recall one), you could
certainly piece it together from what is in the library. 

It can be done as a schematic (schematic capture/entry) so you
don't need to learn an HDL

The work would be in installing and learning the design software
well enough to get the design in and program the device (not hard) and
arranging hardware to actually program the part (a simple parallel port
interface similar in complexity and function to a Xx1541 cable)

> Anyway, thanks for the suggestion.
> Kind regards,
>    Spiro.
> --
> Spiro R. Trikaliotis
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