Hal library sets STM32 clock

This blog knowledge comes from Mr. Wei Dongshan's 7 Internet of things course .

One 、 The meaning of the clock

1、 The clock is the work of synchronizing various peripherals , Every time the clock pulse occurs , The peripheral works once . The faster the clock frequency ,CUP The more efficient the execution .

2、 Advanced MCU , There are clocks of different frequencies . Different clock frequencies can be set for different peripherals , You can turn off the clock , You can also set different clock frequencies , Optimize the whole system .

Two 、STM32 Clock tree analysis

stay stm32f103c8 The first 12 page .

1、 Clock source

• High speed external clock

• Low speed external clock

• High speed internal clock

 

• Low speed internal clock

2、 Basic elements

• Frequency divider

• Selectors

• Frequency multiplier

3、 ... and 、cubeMX Set in the stm32 The clock

Click on the right RCC, Select to set high-speed external clock or low-speed external clock ,mini The development board only has a high-speed external clock , So only high-speed external clock is set here .

Choose crystal / Ceramic resonator .

Then click the clock configuration above （clock configuration） You can configure the clock tree .