Lpc2000

I don't know why you say 'generally'. This is micro specific (especially 
moto parts). PICs, MSP430 etc etc don't need this.

I would asusme that a dedicated RTC crystal oscillator would, like the 
MSP430 and others, already be matched for a typical watch crystal. Most 
6pF load capacitiance watch crystals should then work by directly 
connecting them, no load caps, no resistors.

Al

dharmaBum wrote:

>
> If anyone has successfully used a 32 KHz crystal with the LPC2138,
> please explain how to connect the crystal. 
>
> I saw an example on the Keil eval board where a resistor was
> connected in series with the crystal.  I don't understand how that
> circuit operates.
>
> Generally, a 10M or other large resistor is connected in parallel
> with a crystal in order to bias the oscillator buffer (inside the
> uP) into its linear region.
>
> Has Philips released a more complete data sheet or user manual?
>
> Thanks for the help,
> Wayne Radochonski
>
>
>
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