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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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STM32F358XC 데이터시트(PDF) 71 Page - STMicroelectronics |
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STM32F358XC 데이터시트(HTML) 71 Page - STMicroelectronics |
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71 / 134 page  DocID025540 Rev 4 71/134 STM32F358xC Electrical characteristics 118 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 39. Low-speed external user clock characteristics Symbol Parameter Conditions Min Typ Max Unit fLSE_ext User External clock source frequency(1) 1. Guaranteed by design, not tested in production. - - 32.768 1000 kHz VLSEH OSC32_IN input pin high level voltage 0.7VDD -VDD V VLSEL OSC32_IN input pin low level voltage VSS -0.3VDD tw(LSEH) tw(LSEL) OSC32_IN high or low time(1) 450 - - ns tr(LSE) tf(LSE) OSC32_IN rise or fall time(1) -- 50 |
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