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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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STM32L443CC 데이터시트(PDF) 115 Page - STMicroelectronics |
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STM32L443CC 데이터시트(HTML) 115 Page - STMicroelectronics |
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115 / 207 page  DocID028739 Rev 2 115/207 STM32L443CC STM32L443RC STM32L443VC Electrical characteristics 177 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 20. Figure 20. Low-speed external clock source AC timing diagram Table 43. 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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