Content originally posted in LPCWare by Rob65 on Mon May 30 05:38:37 MST 2011
Thanks,
another related question: what about crystal type and capacitors?
In the data sheet there is a section on clocking containing a table with crystal and capacitor values. This is only for the main oscillator, I could not find any reference to crystal types, load capacitance or capacitors to be used for the RTC's crystal.
I took the 'standard' route to match my capacitors with the load capacitance of the crystal but while 'stealig' some ideas from the LPCXpresso board I noticed that Embedded Artists placed a 100k resistor in series with the crystal on the RTCX2 (output) pin. I placed a 0 ohm resistor in series, but some guidelines from NXP's side would be nice.
Rob