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STM32F303VC 数据表(PDF) 74 Page - STMicroelectronics |
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STM32F303VC 数据表(HTML) 74 Page - STMicroelectronics |
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74 / 148 page  Electrical characteristics STM32F303xB STM32F303xC 74/148 DocID023353 Rev 13 6.3.7 External clock source characteristics High-speed external user clock generated from an external source In bypass mode the HSE 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 14. Figure 14. High-speed external clock source AC timing diagram Table 40. High-speed external user clock characteristics Symbol Parameter Conditions Min Typ Max Unit fHSE_ext User external clock source frequency(1) 1. Guaranteed by design. - 18 32 MHz VHSEH OSC_IN input pin high level voltage 0.7VDD -VDD V VHSEL OSC_IN input pin low level voltage VSS -0.3VDD tw(HSEH) tw(HSEL) OSC_IN high or low time(1) 15 - - ns tr(HSE) tf(HSE) OSC_IN rise or fall time(1) -- 20 |
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