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PICList Thread
'Problems with the ProPic programmer (newbie)'
1998\03\15@144400 by Shahid Sheikh

picon face
Hi all,

I just made a propic v4.2 (from TATO Computers) programmer and when I read
a blank (new) 12C509JW in it, it gives me 3FFF on all the locations. That
is the same stuff I get if there is no pic on the programmer. The
programmer seems to be working OK as it turns on and off all the supplies
to the pic just fine. All my voltage levels are fairly accurate as well
(VPP1=12.98V, VDDprog=4.97V, VDDmax=5.50V and VDDmin=2.54V).

The only significant changes to the circuit I've made is that I've used
2N3904 and 2N3906 instead of BC547 and BC557 and I dont have a VPP2 on my
programmer.

I know this information is vague but anyone has any idea why this may be
happening? I have a 3 ft cable connecting to the parallel port of my laptop
(Compaq Armada 4120). Is that cable too long? It was originally a shielded
parallel port printer cable with shielding connected to the DB25 cover.

At this point I only have a 12C509JW and a 16C54AJW and both of them are
new. Is a new 508/509 supposed to read all 0's except for the last
location?

Any help would be greatly appreciated.

Shahid

Attachment converted: -:WINMAIL.DAT (????/----) (00014BD3)

1998\03\15@160220 by Brian Schousek

picon face
Shahid-
This is normal. Unprogrammed state of an EPROM cells is '1'.  Maximum word
length of the PIC families of interest is 14 bits, so the software is
displaying 14 bits worth of 1's. This is hexadecimal 0x3fff. I don't know
where this is documented- perhaps in the programming specs from Microchip. I
think this is the question you want answered...?

Brian
-----Original Message-----
From: Shahid Sheikh <spam_OUTsheikhTakeThisOuTspamEROLS.COM>
To: .....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU <PICLISTspamKILLspamMITVMA.MIT.EDU>
Date: Sunday, March 15, 1998 2:43 PM
Subject: Problems with the ProPic programmer (newbie)


>Hi all,
>
>I just made a propic v4.2 (from TATO Computers) programmer and when I read
>a blank (new) 12C509JW in it, it gives me 3FFF on all the locations. That
<snip>

1998\03\16@065025 by Marco DI LEO

flavicon
face
Shahid Sheikh wrote:
>
> Hi all,
>
> I just made a propic v4.2 (from TATO Computers) programmer and when I read
> a blank (new) 12C509JW in it, it gives me 3FFF on all the locations. That
> is the same stuff I get if there is no pic on the programmer. The
> programmer seems to be working OK as it turns on and off all the supplies
> to the pic just fine. All my voltage levels are fairly accurate as well
> (VPP1=12.98V, VDDprog=4.97V, VDDmax=5.50V and VDDmin=2.54V).

I got the same problem on that programmer.
The problem I found is on the rising edges of the clock and data lines
used to program the PIC. Watching at them using a scope I saw a 45 deg
slope instead of sharp edge (perhaps may PC is too fast :-).
You should solve the problem REMOVING (or using a lower value) the 470pF
capacitor from RB7 and RB6 to ground or reducing the pull up resistors
to the same lines (R7 & R8).
I did the latter (I used 2.2K) and I am very happy with that programmer.

Try that and let me know.

  Marco


----
Marco DI LEO                  email: .....m.dileoKILLspamspam.....sistinf.it
Sistemi Informativi S.p.A.    tel:   +39 6 50292 300
V. Elio Vittorini, 129        fax:   +39 6 5015991
I-00144 Roma
Italy

1998\03\16@123929 by john pearson

flavicon
face
At 11:00 AM 3/16/98 +0100, you wrote:
{Quote hidden}

If I may add: I use a 6' cat-5 cable and rj45 plugs on my Propic, no caps,
and no problems on my 133MHz Pentium. I don't know if this helps or I am
just lucky.
John

1998\03\16@142330 by ndie Ohtsji [4555]

flavicon
face
Shahid,

I too built the propic programmer and also used 2N3904 and 2N3906.  I've
only tried programming 16C84 and 16F84 .... works great.  I set my VDDmin
to 4.5V.

Did you remember to put caps on the RB6 and RB7 lines?

-Randie
rohtsjispamspam_OUTglenayre.com


{Quote hidden}

1998\03\16@230651 by Shahid Sheikh

picon face
Marco:

I've tried removing the 470 pF caps altogether, changing the pull up to a
2.2K with and without the caps. Still the same result.

I can take the data clock and connect it to the data input/output once the
software starts reading the data and the data input is all 0's so I know
the circuit is working somewhat.

I'm waiting for some new pics and am going to wait till then to try to
program anymore pics. Till then, if you or anyone else has any more
suggestions I'll like to try them out.

Thanks,

Shahid

----------
From:   Marco DI LEO[SMTP:spamBeGonem.dileospamBeGonespamSISTINF.IT]
Reply To:       pic microcontroller discussion list
Sent:   Monday, March 16, 1998 5:00 AM
To:     TakeThisOuTPICLISTEraseMEspamspam_OUTMITVMA.MIT.EDU
Subject:        Re: Problems with the ProPic programmer (newbie)

Shahid Sheikh wrote:
>
> Hi all,
>
> I just made a propic v4.2 (from TATO Computers) programmer and when I
read
> a blank (new) 12C509JW in it, it gives me 3FFF on all the locations. That
> is the same stuff I get if there is no pic on the programmer. The
> programmer seems to be working OK as it turns on and off all the supplies
> to the pic just fine. All my voltage levels are fairly accurate as well
> (VPP1=12.98V, VDDprog=4.97V, VDDmax=5.50V and VDDmin=2.54V).

I got the same problem on that programmer.
The problem I found is on the rising edges of the clock and data lines
used to program the PIC. Watching at them using a scope I saw a 45 deg
slope instead of sharp edge (perhaps may PC is too fast :-).
You should solve the problem REMOVING (or using a lower value) the 470pF
capacitor from RB7 and RB6 to ground or reducing the pull up resistors
to the same lines (R7 & R8).
I did the latter (I used 2.2K) and I am very happy with that programmer.

Try that and let me know.

  Marco


----
Marco DI LEO                  email: RemoveMEm.dileospamTakeThisOuTsistinf.it
Sistemi Informativi S.p.A.    tel:   +39 6 50292 300
V. Elio Vittorini, 129        fax:   +39 6 5015991
I-00144 Roma
Italy

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