[sdiy] Semi-OT: PIC trouble

[Karl Ekdahl]

Hi list, i'm having trouble interfacing a HDLG-2416
(http://www.datasheetcatalog.com/datasheets_pdf/H/D/L/G/HDLG-2416.shtml)
with a PIC18F2455. I seem to get some feedback from
the HDLG back to the pic that makes the oscillator
unstable, i have a eternal loop flashing a LED and
it's *not* flashing in a perfectly sequencial manner.
I have a 2.4A PSU and the HDLG is connected via two
4094's so i don't really understand what's going on. I
have verified that it's really the HDLG by simply
pulling it out of its socket and observing the LED.
Though since the pic is fast, i do run it on 48Mhz
(oscillator, not crystal/resonator) which i guess
might be a problem while not using 1st grade
components....

hrmm.. now when i come to think about it, haven't
people here been talking about resonance/noise in
LEDs?

Ideas (or directions to a good pic forum) highly
appreciated!

Karl