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STM32L475VC Datasheet(PDF) 111 Page - STMicroelectronics |
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STM32L475VC Datasheet(HTML) 111 Page - STMicroelectronics |
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111 / 193 page  DocID027692 Rev 2 111/193 STM32L475xx Electrical characteristics 181 Figure 13. High-speed external clock source AC timing diagram Low-speed external user clock generated from an external source In bypass mode the LSE 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 6.3.14. However, the recommended clock input waveform is shown in Figure 14. Figure 14. Low-speed external clock source AC timing diagram Table 45. Low-speed external user clock characteristics(1) Symbol Parameter Conditions Min Typ Max Unit fLSE_ext User external clock source frequency - - 32.768 1000 kHz VLSEH OSC32_IN input pin high level voltage - 0.7 VDDIOx -VDDIOx V VLSEL OSC32_IN input pin low level voltage - VSS -0.3 VDDIOx tw(LSEH) tw(LSEL) OSC32_IN high or low time - 250 - - ns 1. Guaranteed by design. |
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