BINGO!  I guess I really need to pay a little more
attention to those keywords...  Of course, being
new to PICS, that didn't mean anything to me the
first few times I read it (I had no idea how long
each instruction took).  4 nop's didn't work, but
a delay of 160us did work beautifully.. It's
overkill, but it works, I'm a happy camper...

Thank you all VERY much.  (BTW-I'm building webpages
with all of the questions/answers that I've needed
while learning, I'll post the address when I'm done
for all the newbies).

-- Rob

--- Drew Vassallo <snurple@HOTMAIL.COM> wrote:
> >Does anybody have 16F84 (actually 16F84A) code for
> >driving an LCD (preferrably with Mike's circuit, it's
> >nice only using 2 pins) running @ 20mhz?
> >
>
> From Myke's web page:
>
> "The biggest issue to watch for is to make sure the "E" Strobe's
> timing is
> within specification (ie greater than 450 nsecs), the shift register
> loads
> can be interrupted without affecting the actual write. This circuit
> will not
> work with Open-Drain only outputs (something that catches up many
> people)."
>
> 20MHz would violate this.  I would try adding two 'nop's in and
> around the E
> strobe timing for your code.  This will at least bring it into spec.
> Then
> you can debug from there if it isn't working.
>
> --Andrew
>
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