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AN4325 Datasheet(PDF) 14 Page - STMicroelectronics |
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AN4325 Datasheet(HTML) 14 Page - STMicroelectronics |
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14 / 27 page  Clocks AN4325 14/27 DocID024966 Rev 1 External source (HSE bypass) In this mode, an external clock source must be provided. It can have a frequency of up to 32 MHz. You select this mode by setting the HSEBYP and HSEON bits in the Clock control register (RCC_CR). The external clock signal (square, sinus or triangle) with ~40-60% duty cycle depending on the frequency (refer to the datasheet) has to drive the OSC_IN pin while the OSC_OUT pin can be used a GPIO. See Figure 5. |
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