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by neetdeth
2666 days ago
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The clock source is typically generated by a phase locked loop from the external crystal oscillator. There's a PLL multiplier and divider value that you can set obtain the desired frequency. I think the MCU starts running at a low speed from an internal RC oscillator, and then setting up the high speed clock source happens early in the initialization code. This code can be generated by ST's STM32Cube software, which is useful as a reference implementation even if you don't use the generated code in your project. |
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