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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM32L433CB датащи(PDF) 129 Page - STMicroelectronics |
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STM32L433CB датащи(HTML) 129 Page - STMicroelectronics |
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129 / 225 page  DS11449 Rev 5 129/225 STM32L433xx Electrical characteristics 193 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 21: High-speed external clock source AC timing diagram. Figure 21. High-speed external clock source AC timing diagram Table 54. High-speed external user clock characteristics(1) Symbol Parameter Conditions Min Typ Max Unit fHSE_ext User external clock source frequency Voltage scaling Range 1 -8 48 MHz Voltage scaling Range 2 -8 26 VHSEH OSC_IN input pin high level voltage - 0.7 VDDIOx -VDDIOx V VHSEL OSC_IN input pin low level voltage - VSS - 0.3 VDDIOx tw(HSEH) tw(HSEL) OSC_IN high or low time Voltage scaling Range 1 7- - ns Voltage scaling Range 2 18 - - 1. Guaranteed by design. MS19214V2 VHSEH tf(HSE) 90% 10% THSE t tr(HSE) VHSEL tw(HSEH) tw(HSEL) |
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