Lpc2000

Arie wrote :

> If the resistor is electrically between output and crystal, it is used to
> limit the drive to the crystal. Expecially the 32 kHz crystals can easily be
> overdriven and destroyed. But 560 K looks a bit high - I normally use 220
> kOhm.

Arie brings up a good point too, and it's easily overlooked.
Crystals that are driven too hard age fast, will excessively drift in frequency much quicker 
(not such an issue w/ MCU in general I guess), can also go in overtone over Vcc 
and even just break.

> If is is beteen the input and output of the oscillator amplifier, it is a
> biasing resistor - and should normally be between 2.2 and 10M ohm.

As before.
Can be as low as 1 Mohm though :-)

B rgds
Kris


[Non-text portions of this message have been removed]