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Low-speed quartz resonator load capacitance

Question asked by pivovarov.ivan on Dec 7, 2012
Latest reply on Dec 7, 2012 by Clive One

In the device datasheet DS6329 v.9 on page 85 I found the following:
Caution: To avoid exceeding the maximum value of CL1 and CL2 (15 pF) it is strongly recommended to use a resonator with a load capacitance CL ≤  7 pF. Never use a resonator with a load capacitance of 12.5 pF.

This seem to be interesting for AFAIK 12.5 pF load capacitance of 32768 Hz resonators is very common. May anybody tell me what is the cause of this strong limitation?

I also didn't find Oscillator Design Guide related to STM32F2xx microcontrollers. Is AN2867 suitable for them?

And the last question, are there any crystals provided by Geyer recommendable to use with STM32F2xx?