The minimum system crystal used is 8m.
Here is the configuration process:
Automatic clock switching, enable switching interrupt
Clear the interrupt flag in the interrupt, enable CSS and turn on CSS interrupt
When a CSS interrupt occurs, clear the CSS interrupt flag and divide the HSI frequency by two, that is, 16M/2=8M, which is the same as the external crystal oscillator. This will not affect the serial port baud rate.
The window outputs configuration information:
Touching the PA1 and PA2 pins with your hands will cause the external crystal oscillator to fail.
Serial port output CSS interrupt
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