hi, i want to know more about the oscillators behind the micro controller STM32F765, is the external oscillator needed? or the internal oscillators are enough ?

[waclawek.jan]

That depends on your application. External oscillators are used when higher timing precision is needed, e.g. for communication interfaces.

JW

[S.Ma]

It depends on what you want to do. All is about tolerances. USB OTG, Audio and ethernet would be most demanding.