JDM programmer problem ?

Started by Vincent Clerc October 18, 2004
Message
Hello all,
 
I have a JDM programmer PIC-PG1 (the most simple).
 
have all my circuit functioning perfectly on a bread board.
 
I have received my PCB, I use the exact same wiring but I can't program the pic16F628.
 
I use only the ICSP1 (MCLR), ICSP4 (CLK) and ICSP5 (DATA) of the plug. I power my circuit through a 9 v battery.
 
The bread board is powered through a power supply.
 
I wonder if I have a problem with ground loop or something like that, since the PIC-PG1 'creates' the 15v of the MCLR from the RS232 signals.
 
Has anybody encountered the same problem? Any input would be great !
 
 
For information, if I connect an oscilloscope probe, to the bread board, for example, I experience the same problem. The PIC-PG1 "refuses" to program the pic. I don't understand why but that a fact. It's probably because the GND created by the programmer is different from the gnd of the scope?
 
But, in my pcb version the ground is, virtual, in a way. It is a battery !
 
Please help !
 
Vince





Sometimes folks get caught with the PGM pin issue. If Low Voltage
Programming is enabled, and upon complete erasure it is, then the
PGM pin must be held low during normal high voltage programming. --- In , "Vincent Clerc" <vincent.clerc@i...>
wrote:
> Hello all,
>
> I have a JDM programmer PIC-PG1 (the most simple).
>
> have all my circuit functioning perfectly on a bread board.
>
> I have received my PCB, I use the exact same wiring but I can't
program the
> pic16F628.
>
> I use only the ICSP1 (MCLR), ICSP4 (CLK) and ICSP5 (DATA) of the
plug. I
> power my circuit through a 9 v battery.
>
> The bread board is powered through a power supply.
>
> I wonder if I have a problem with ground loop or something like
that, since
> the PIC-PG1 'creates' the 15v of the MCLR from the RS232 signals.
>
> Has anybody encountered the same problem? Any input would be
great !
>
>
> For information, if I connect an oscilloscope probe, to the bread
board, for
> example, I experience the same problem. The PIC-PG1 "refuses" to
program the
> pic. I don't understand why but that a fact. It's probably because
the GND
> created by the programmer is different from the gnd of the scope?
>
> But, in my pcb version the ground is, virtual, in a way. It is a
battery !
>
> Please help !
>
> Vince