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STM32H757AI 数据表(PDF) 139 Page - STMicroelectronics |
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STM32H757AI 数据表(HTML) 139 Page - STMicroelectronics |
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139 / 251 page  DS12931 Rev 1 139/251 STM32H757xI Electrical characteristics 230 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 I/O. The external clock signal has to respect the Table 72: I/O static characteristics. However, the recommended clock input waveform is shown in Figure 22. Note: For information on selecting the crystal, refer to the application note AN2867 “Oscillator design guide for ST microcontrollers” available from the ST website www.st.com. Figure 22. Low-speed external clock source AC timing diagram Table 52. 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. ai17529b OSC32_IN External STM32 clock source VLSEH tf(LSE) tW(LSE) IL 90% 10 % TLSE t tr(LSE) tW(LSE) fLSE_ext VLSEL |
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