How to set cpu fclk frequency

How to set the cpu fclk frequency?

Before setting the CPU clock, you need to first clarify the source of the clock, whether to use the CPU's internal clock or an external clock. If it is an external clock, you need to select an appropriate clock circuit to implement based on the allowable range of the chip.

Clock configuration: find the clock tree;

Configure clock source, CSS register configuration

Configure PLL: Yes PREDIV, PLLSRC, and PLLMUL are used to configure the three registers

Configuring the system clock

The configuration of the registers needs to be found in the STM32 preparation manual

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