That inverter is the amplifier used to make the discrete crystal run, as
far as I remember at college u need a positive feedback loop and unity
gain amplifier to make the circuit oscillate, the good thing about
crystals is that they are very stable oscillators so they are accurate
for timing applications.=20
U don't have to worry about this to make your project work.

-----Original Message-----
From: John Sambrook [mailto:JohnS@COMMON-SENSE.COM]=20
Sent: Sunday, February 10, 2002 8:46 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: Can I use an Epson SG-531P oscillator with a 16F84 PIC ...

Hi,

I'm looking at my first PIC project, and need some advice
on the following.

Rather than fooling around with a discrete crystal and a
pair of caps for my oscillator circuit, can I just use a
pre-packaged oscillator, like the Epson SG531-P line,
with the OUT (pin 5) connected directly to OSC1 on the
PIC?

The PIC datasheet for the 16F8X parts (DS30430c, pg. 40),
in figure 8-4, shows "clock from ext. system" going through
an inverter before connecting to OSC1.  What's the purpose
of this inverter?

Sorry if these questions are simple, but I'm a relative
newbie with digital circuits.

Thanks,

John

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