>>   So, I believe I need to isolate the digital input connection from
>> the VPP signal of the ICD during programming to protect the 
> chip that
>> is driving it.  Comments?
> 
> Sounds like you have it fairly well figured-out, since it's the same 
> dillema with tiny chips such as the 12Fxxx series.
> Yes, expect hi-voltage required to program the chip, which means 
> watch-out what you connect to this pin.

OR: forget ICSP. At least for production: for development you could
consider a development rig with one (or maybe more) switches (or even
relais).

Wouter van Ooijen

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

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