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STM32F038X6 Datasheet(PDF) 53 Page - STMicroelectronics |
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STM32F038X6 Datasheet(HTML) 53 Page - STMicroelectronics |
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53 / 102 page  DocID026079 Rev 5 53/102 STM32F038x6 Electrical characteristics 79 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 6.3.13. However, the recommended clock input waveform is shown in Figure 14. Figure 14. Low-speed external clock source AC timing diagram Table 30. Low-speed external user clock characteristics Symbol Parameter(1) 1. Guaranteed by design, not tested in production. 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 450 - - ns tr(LSE) tf(LSE) OSC32_IN rise or fall time - - 50 |
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