ST STM32F101 series Reference Manual page 63

Advanced arm-based 32-bit mcus

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Memory and bus architecture

The USART peripheral operates with the internal 8 MHz oscillator (HSI). The CAN and

USB OTG FS, however, can only function if an external 8 MHz, 14.7456 MHz or

25 MHz clock (HSE) is present.

For further details, please refer to AN2606.

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