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GPIO configuration for LSE crystal (STM32F102RBT6)

Question asked by jayteemo on Nov 28, 2011
Latest reply on May 3, 2014 by Clive One
This should be an easy one for you...

I'm a new STM32 user and I am unsure how to configure the GPIO for PC14-15 when using 32kHz crystal as the LSE. 
Do both pins need to be configured as alternate function (PP or OD?) or as input/output? 

I would assume alternate, but I've noticed in the examples that, even though the alternate fuction is used, some pins are still configured as I/O ( e.g., USART RX and input-capture).