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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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STM32F051K6 데이터시트(PDF) 57 Page - STMicroelectronics |
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STM32F051K6 데이터시트(HTML) 57 Page - STMicroelectronics |
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57 / 104 page  Electrical characteristics STM32F051x 58/105 Doc ID 022265 Rev 3 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 13. Figure 13. Low-speed external clock source AC timing diagram Table 35. Low-speed external user clock characteristics Symbol Parameter(1) 1. Guaranteed by design, not tested in production. Conditions Min Typ Max Unit fLSE_ext User External clock source frequency - 32.768 1000 kHz VLSEH OSC32_IN input pin high level voltage 0.7VDD -VDD V VLSEL OSC32_IN input pin low level voltage VSS -0.3VDD 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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