What does System clock and To Power mean???

[MYu.1]

1 . what does means System Clock in MCU?

does it mean electronic device in a MCU that issues a steady high-frequency signal that synchronizes all the internal components?​

I want the exact meaning of System clock.

2 . what is To Power(MHz) 

SYSCLK ​in Clock Configuration of STM32CubeMX connected to To Power(MHZ)

What is To Power ?

please reply to question.

Thank you 

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[Peter BENSCH]

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1. The STM32 devices provide multiple clock sources. It is strongly advised to read the Clocks section in the reference manual for the respective derivative.
2. In which document or which software did you find this sentence?

Regards

/Peter

[Amel NASRI]

Hi @Peter BENSCH​ ,

To answer your second question: I think that @MYu.1​ is speaking about STM32CubeMX (seeing this similar question).

-Amel

[Peter BENSCH]

Hi, @Amel,

correct, meanwhile I also found this question, which was already answered by @Uwe Bonnes​. Unfortunately the RM0390 is a bit short in this regard.

/Peter