Lpc2000

Sean,

did you read my comment about the 6800 and 8080 mode - resp. did you check 
if you are running the correct mode?

Herbert

At 12:04 16.02.2006 -0500, you wrote:

>Thanks for the comment Glen,
>
>I checked the timing with an Oscilloscope and it's fine.  The pulses stay
>for about 500nS (I'm using legacy GPIO mapping so it's slower).  A complete
>write cycle takes 940nS.  If anything I think it may be too slow, but I've
>seem this used with a 8051 (much slower) without any issues, unfortunately
>I don't have the source code for that.  Maybe I'll try using FGPIO and see
>if that makes a difference.
>
>Does anyone know of any alternatives to SED13305 (that's cheap?)
>
>Thanks!
>
>-- Sean
>
>At 07:15 2/16/2006, you wrote:
> >Sean,
> >
> >I have used the SED 1335 in the past.  One thing that is too
> >obvious is that the SED part is probably not the fastest thing
> >in the world, and you may be exceeding it speed capability.
> >
> >I never had this problem with the Z80 family I was using at the
> >time, but the new ARM chips are way too fast for the 1335, I do not
> >know about the chip you are using.
> >
> >Just a thought.
> >
> >Glen
> >
> >
> >Sean wrote:
> >
> > > Hello all,
> > >
> > > I am having an issue here and I hope someone has some suggestions.  I'm
> > > trying to interface some LCDs to my micro, I have a graphical 128x64 
> which
> > > has an embedded controller chip interfaced fine, using P1.16-P1.23 as
> > 8-bit
> > > parallel IO.  However when I try to hook up a SED13305 the data seems to
> > > get corrupted.  I'll issue a write to the device to store something in
> > > VRAM, then immediately try to read it back.  Here's where things get 
> weird.
> > >
> > > If I try to use the WR and RD signals like they should be used (RD always
> > > high, Clear WR, Set Byte, Set WR), the write appears to work, however
> > > repeated reads of the same memory area return different results each
> > > time.  Enough reads show that the data was written successfully.  However
> > > if I modify only the write routine to use the WR and RD signals in a
> > > different (wrong) way (Clear WR, Set RD, Set Byte, Set WR, Clear RD) then
> > > repeated reads return the same data every time, however bits 7:8 are
> > always
> > > "10".  Note that the read routine is the exact same both times.
> > >
> > > How is it possible to have a small change to the write routine effect how
> > > the read routine works?
> > >
> > > I have tried playing with timing to no avail.  I looked at everything 
> with
> > > an oscilloscope and the timing and data look correct.  I've verified all
> > > connections with a multimeter. I have both the micro and the SED running
> > > off of 3.3V.  Note that if the SED is running at 5V then I get complete
> > > garbage on read (meaning probably nothing worked), even though the SED
> > says
> > > it works from 2.7V to 5.5V.
> > >
> > > I think I'm going to have to try to make another test board, but before I
> > > run out to do that does anyone have any ideas as to why this is 
> happening?
> > >
> > > Thanks,
> > >
> > > -- Sean
> > >
> > >
> > >
> > >
> > > Yahoo! Groups Links
> > >
> > >
> > >
> > >
> > >
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