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PICList Thread
'[PIC]628 programming help'
2006\01\05@235537 by Juan Cubillo

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Hello list,
After one year of struggling with my jdm programmer I was finally able to get it working. It has a 18 pin socket for a 16F84A. What do I need to add to make it work with a 16F628???
Thnkz
Juan Cubillo
llo utilizara el celular 310 3789 , correo electronico
spam_OUTseatradeTakeThisOuTspamracsa.co.cr  y desempe=F1ara labores como coordinador de =
operaciones
portuarias

=20

Saludos cordiales,

Mauricio Garita

ANTENA S.A

=20

=20

Tel  758 7070

Fax 758 7171

=20


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trabajo esta el se=F1or Fabian Castillo utilizara el celular 310 3789 , =
correo
electronico <a =
href=3D".....seatradeKILLspamspam@spam@racsa.co.cr">seatradespamKILLspamracsa.co.cr</a> =A0y
desempe=F1ara labores como coordinador de operaciones =
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<p class=3DMsoNormal><font size=3D2 face=3DArial><span lang=3DES-TRAD =
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<p class=3DMsoNormal><font size=3D2 face=3DArial><span lang=3DES-TRAD =
style=3D'font-size:
10.0pt;font-family:Arial'>Mauricio Garita<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span lang=3DES-TRAD =
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<p class=3DMsoNormal><font size=3D2 face=3DArial><span lang=3DES-TRAD =
style=3D'font-size:
10.0pt;font-family:Arial'>Tel =A0758 7070<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span lang=3DES-TRAD =
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2006\01\06@074825 by Jan-Erik Soderholm

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Juan Cubillo wrote :

> Hello list,
> After one year of struggling with my jdm programmer I was
> finally able to get it working. It has a 18 pin socket for a
> 16F84A. What do I need [...] to [...] work with a 16F628???

Another programmer ?

Jan-Erik.



2006\01\06@084654 by Maarten Hofman

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> After one year of struggling with my jdm programmer I was finally able to get it working. It has a 18 pin socket for a 16F84A. What do I need to add to make it work with a 16F628???

A 16F628 should work fine. Just use software that supports it (IC-prog
works, for example). Note that a 16F628A might not work (although my
JDM handles 16F628A with no problems).

Greetings,
Maarten Hofman.

2006\01\06@092255 by Dennis J. Murray

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I have a generic programmer that is supposedly similar to the JDM
programmer and also uses IC-Prog, which DOES support the '628 nicely.
One point you need to be aware of (and I don't know if the real JDM
programmer handles this - mine didn't) is that, unlike the 'F84, the
'F628 has a PGM pin (pin 10) which must be tied LOW for programming a
'628. If this is NOT done, your programming of the chip may be erratic
at best! The schematic should tell you if there is a pull-down or not.

Been there, done that - easily remedied when you know what to look for!
I just added a switch to flip which inserts a pull-down resistor when I
need to program a chip needing PGM LOW. My programmer programs a LOT of
the PIC line and uses a 40-pin ZIF for the programming socket. I didn't
feel comfortable that I could guarantee every chip programmed would be
happy with that pin pulled low, thus the switch.

Good luck!
Dennis


Maarten Hofman wrote:

{Quote hidden}

2006\01\06@093507 by Juan Cubillo

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Thanks for the answers.
I think that i'll make an adapter socket that goes between the jdm and the pic. This adapter only needs a 4.7k resitor from pin 10 to gnd, right?

Juan Cubillo

{Original Message removed}

2006\01\06@095635 by Maarten Hofman

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> Thanks for the answers.
> I think that i'll make an adapter socket that goes between the jdm and the pic. This adapter only needs a 4.7k resitor from pin 10 to gnd, right?
>
> Juan Cubillo

You could just connect the resistor without an adapter. I agree that
grounding the PGM pin is something that will improve programming
success of the 16F628, however, I doubt any other PIC that can be
programmed by the JDM programmer will be bothered by that pin being
grounded (in fact, it is usually a good idea to keep all your pins in
a "known" state).

Greetings,
Maarten Hofman.

2006\01\06@100424 by Dennis J. Murray

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You should accomplish this pull-down by ensuring your adapter's pin 10
does NOT make connection to the JDM programmer's pin 10 and only
connects to the 4.7K resistor to GND. That way, it doesn't matter what
the JDM programmer is doing with that pin, since you'll essentially
ignore it.

As far as the value of the resistor, I don't see any reason why 4.7K
wouldn't be sufficient, although I tend to use 330 to 470 ohms from a
PIC pin to GND as a general rule.

Good luck!
Dennis

Juan Cubillo wrote:

>Thanks for the answers.
>I think that i'll make an adapter socket that goes between the jdm and the pic. This adapter only needs a 4.7k resitor from pin 10 to gnd, right?
>
>Juan Cubillo
>
>{Original Message removed}

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