OSC_IN and OSC_OUT are external crystal pins by default.
If you do not use an external crystal oscillator on the STM32, how to connect OSC_IN and OSC_OUT
If you use the internal RC oscillator instead of an external crystal oscillator, please follow the steps below:
1) For products with 100 or 144 pins, OSC_IN should be grounded and OSC_OUT should be left floating.
2) For products with less than 100 pins, there are two ways to connect:
2.1) OSC_IN and OSC_OUT are grounded through 10K resistors. This method can improve EMC performance.
2.2) Remap OSC_IN and OSC_OUT to PD0 and PD1 respectively, and then configure PD0 and PD1 as push-pull outputs and output '0'. This method can reduce power consumption and save 2 external resistors (compared to 2.1 above).
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