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'[PIC] Programming newer devices with homemade prog'
2006\02\24@112401 by Handrich, Edward

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Hello all,
I am using 12F629, 16F628, and some of the 18F devices.
I cannot use LVP mode for ICSP.
I am using computers that run WinXP.

Before I ask the question, I will say that I have tried
using IC-PROG and it doesn't work with the two circuits
that I tried from the IC-PROG webpage ( for the devices
I have listed ).  In fact, it won't work at all with
the printer port.

I have use of a programmer at work, which I used to load
a few of the devices and then tried to just read them
using the 'JDM' and 'TAIT Serial' circuits.  Neither
circuit can read them.  I wrote my own software using
the printer port and 'TAIT classic' circuit and the
PIC device never communicates.  When I plug the PIC
device in at work, it reads it fine.

After looking at the programming spec for the different
chips, I noticed that Vdd and Vpp have to be applied in
a different sequence depending on the chip.  Perhaps
Microchip made an error in the programming spec ?

Has anybody been able to program these devices using
WinXP software and a homemade circuit for High Voltage
programming ?

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Thank you.

2006\02\26@161051 by Wouter van Ooijen

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> Has anybody been able to program these devices using
> WinXP software and a homemade circuit for High Voltage
> programming ?

Yes of course, various people have build home made versions of my
Wisp628. Likewise home-build clone designs of Mircohip's ICD1 and ICD2
exist. But these are all intelligent proggers, that use the serial port
for communication.

Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: http://www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: http://www.voti.nl/hvu


2006\02\27@035400 by Chen Xiao Fan

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> -----Original Message-----
> From: .....piclist-bouncesKILLspamspam@spam@mit.edu
> On Behalf Of Handrich, Edward
>
> Hello all,
> I am using 12F629, 16F628, and some of the 18F devices.
> I cannot use LVP mode for ICSP.
> I am using computers that run WinXP.
>
> After looking at the programming spec for the different
> chips, I noticed that Vdd and Vpp have to be applied in
> a different sequence depending on the chip.  Perhaps
> Microchip made an error in the programming spec ?
>

No. There are some PICs require Vpp before Vdd. PIC12F629
is one of these PICs. This will pose problems for pure
ICSP programmers in certain configurations.

>Has anybody been able to program these devices using
>WinXP software and a homemade circuit for High Voltage
>programming ?

You may want to try out some other software like
WinPIC/WinPIC800/PICPGM which may work better than
IC-Prog in certain cases. I never used any of them
though since I do not have any JDM/Tait type
programmers. I use PICkit 2/PICkit 1/Wisp628A/ICD2,
all of them are PIC based "intelligent" programmer.

Regards,
Xiaofan

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