"Giles L. Honeycutt" schrieb:

> I agree with Dan, your cable must be too long.  I can't see what you have
> attached to RB6 and RB7, but you may want to isolate them from the circuit
> for programming.

The LCD-Display is the only part connected to RB6 & RB7.
I will give 'em a try without it.

>
> Another problem I have seen, if you programmer is supplying +5VDC, then it
> could be overloaded or if it is turned on at time of programming, it could
> be coming up slow.
>

There are 5V comming from the supply. The connection to the programmer is off.

>
> Suggestion:
> 1. Ty using a slower programming algorithm.  (What software are you using?),
> if you are using the PRO16 software, you might try the ITU software, it
> seems to operate at a slower pace. (only because I noticed how much faster
> the PRO16 software burns)

I am using the Galep-3 programmer. I have no access to the software.

>
> 2. Try removing the components attached to RB6-7 and see if unloading them
> helps.

Difficult, All circuit, including the LCD-Controller are on the same board. I
have to cut traces.
And that's no way for production.

>
> 3. Verify powersuppy operation on the programmer.

checked, +5.05V & +12.98V

>
> 4. Shorten programming cable (or slow down programming)

yes, to < 10 cm

>
>
> We are having similar problems with the 877 PIC.  Please let us know what
> works best for you.
> I am wanting to find some good source code for operating the programmers so
> I can customize it to our need.

I am interested in a programmer for PICs-only, where I have the possibility to
modify software,
but also to download updates. It has to be a professional tool.

Thanks for your good ideas.
The process in verifying the next steps is time-consuming (and costly too):
programming, unsoldering the smd-device,
soldering a new device, programming ..... you see !

>
>
> Best of luck,
> Giles
>
> -----Original Message-----
> From: pic microcontroller discussion list [mailto:PICLIST@MITVMA.MIT.EDU]On
> Behalf Of Peter Keller
> Sent: Tuesday, December 14, 1999 9:30 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: 16C63A Programming
>
> I have a problem with incicuit-programming the 16C63A .
> I started with the DIL version on sockets and programmed it on an external
> programmer.
> Everything was o.k., as expected.
> Then, when the project was redesigned, the 16C63A was soldered onto the
> board (smd)
> and programmed via connector P3, where the signal come from the same pins on
> the programmer
> through an adapter cable.
> Now 2-3  out of 10 PICs wont program without error.
> Any idea ?
> Peter Keller