Using crystal HSE configuration with external HSE source?

[DMårt]

Hi!

I have a STM32103 processor and I wonder if something bad can occurs if I use an external oscillator to OSC_IN and leave the OSC,_OUT floating. With a ceramic crystal HSE configuration in CubeMX.

I know that the BYPASS clock source is the best HSE configuration for an external source (as I have) because then the OCS_OUT is not oscilating. 

But for me, it won't make any difference because my OSC_OUT is floating and not connected to anything. Or will this break after few years of running?

I know that my OSC_OUT have the same oscillations as OSC_IN due to the "wrong" configuration. 

[DMårt]

@Andrew Neil 

I know that's correct mode. But the question is: will this current CubeMX configuration take damage on the microcontroller?

[mbarg.1]

Again:

NO

CANNOT damage anything - guaranteed by design.