Hi.
Note that in many/some cases, depending on whats connected
to the PGC/PGD pins, they can be shared between the ICSP
programer and the rest of the curcuit. Just as one example,
if one or both of the lines are feeding a indicator LED (with not *to*
much current drawn) it (the LED) will just flicker during the programming.
So it very much depends on the rest of the curcuit.

With that said, I think your thought isn't bad at all. It's a
generic solution that should work more or less what's
connected to the programming pins.

Regards,
Jan-Erik.

Peter Johansson wrote :

> Here is what I plan to do once my circuits go from breadboard to PCB:
> 
> Solder in a single row of 8 header pins (or two rows of 4 pins)
> something like this:
> 
> 
> PIC         header pins
> |           |
> |           |   jumpers      ICSP
> |           |   |            |
> v           v   v            v
> 
> -----+
>      |
> VDD  |------*         O----- VDD
>      |
> MCLR |------* O-+     O----- MCLR
>      |          |
>      |   <--* O-+     O
>      |
> PGC  |------* O-+     O----- PGC
>      |          |
>      |   <--* O-+     O
>      |
> PGD  |------* O-+     O----- PGD
>      |          |
>      |   <--* O-+     O
>      |
> VSS  |------*         O----- VSS
>      |
> -----+
> 
> The basic deal is that the programming is *physically* isolated from
> the rest of the circuit.  In operation, jumpers are used on the pins
> to send MCLR/PGC/PGD to route to operational functionality.  For
> programming, these jumpers are removed and the ICSP is plugged into
> the DIP/SIP header.  Jumpers could also be used to isolate VDD/VSS,
> but I'm not sure this will be necessary is most cases.
> 
> As a *hobbyist*, though, I'd probably try to select a uC with enough
> extra pins so that I wouldn't need the jumpers at all, and could just
> leave the programmer in-place for both programming and debugging.
> 
> Note that this is just a *plan* and not something I have actually
> implemented, so comments are of course very much welcomed!
> 
> -p.



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