Use resonators from murata. I have thousands of units out with 16 MHz
resonators with internal capacitors. They connect directly to the PIC
pins with no other wiring. I had trouble with ECS and other resonators.
Talking to ECS, they said that if it worked in their sample circuit
(based on a CMOS inverter), the resonator was fine. The problem was our
circuit (over which we have very little control). Murata, on the other
hand, will characterize resonators for use directly with various micros.
Check their website for the micro search engine.

Harold


On Wed, 11 Jul 2001 01:03:00 -0700 Andre Abelian <engelec@EARTHLINK.NET>
writes:
> 1. try changing XT to HS .
> 2. try adding series resistor on OSC2  pin or 10k pot and slowly
>     turn it ?
> 3. make sure your master clear pin do not have higher then 0.01 mf
> cap
>     and your 5v is clean.
>
> Andre Abelian
>
> > Hi Donovan,
> >
> > I've found that 16 MHz or higher ECS oscillators with internal
> caps do NOT
> > work with ANY PICmicros.  The built in 30 pF capacitance is too
> high.
> >
> > Take a look at Panasonic's resonators (with 20 pF built in
> capacitors or
> > less) or use the ECS oscillators which do not have built in caps
> and add
> > your own external 15-22 pF caps.
> >
> > Good luck,
> >
> > myke
> > ----- Original Message -----
> > From: "Donovan Parks" <dparks@UVIC.CA>
> > To: <PICLIST@MITVMA.MIT.EDU>
> > Sent: Thursday, June 21, 2001 12:36 AM
> > Subject: [PIC]: PIC16F877 not working with 20.0 MHz Resonator
> >
> >
> > > Hello,
> > >
> > > I am using a PIC16F877 - 20/P and wish to use a 20.0 MHz
> resonator with
> > it.
> > > I am using a ECS Inc. ZTT-20.00MX resonator.  It has build in
> capacitors
> > and
> > > thus I am connected it directly to the PIC, but the PIC doesn't
> work.  I
> > > have a 4.0 MHz resonator (says ZTT on it) and the PIC works with
> it.
> Any
> > > suggestions?  Is there anything that needs to be changed when
> swapping
> > > resonators?  I am testing with a simple piece of code that
> blinks an LED
> > at
> > > 1s (though this would be much faster at 20MHz).
> > >
> > > Thanks,
> > > Donovan Parks
> > >
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