Datasheet

DocID022799 Rev 6 71/132
STM32L15xCC STM32L15xRC STM32L15xUC STM32L15xVC Electrical characteristics
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6.3.6 External clock source characteristics
High-speed external user clock generated from an external source
In bypass mode the HSE oscillator is switched off and the input pin is a standard GPIO.The
external clock signal has to respect the I/O characteristics in Section 6.3.12. However, the
recommended clock input waveform is shown in Figure 15.