hmm.

I've noticed that one sure-fire way to figure out something on your
own is to walk over and ask someone else, only to have the answer
finally dawn on you (maybe just by going through the exercise of
framing the question differently to ask someone else)... I think
I just did that to myself in my previous question posted here,
although I wish I had that epiphany BEFORE I hit "send".

Okay, so I think I was mentally confusing the PIC with another
chip (an EPROM) I'm also working with which had different timing
requirements for program mode.

So feel free to just ignore my previous question, unless the
following still doesn't sound right...

I ought to be able to hold the chip at 0V (all pins), then raise
Vpp and Vdd (in the order specified by the chip's datasheet)
from 0V to their program voltages, then clock the data in.

In general, random I/O pins may be floating, at Vdd, Vpp, or Vss
during programming and verification.  (Since on multi-chip
programmers they need to appear on several different pins.)

Fiddling with Vdd at different levels is only for verification,
and I'm guessing isn't always strictly necessary for prototypes
and hobby work.

Sound right?
--steve
--
Steve Willoughby     | "It is our choices... that show what we truly
<steve@alchemy.com>  | are, far more than our abilities."
                     |     --Albus Dumbledore, in Harry Potter and the
                     |            Chamber of Secrets, by J. K. Rowling

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