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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM32L443CC датащи(PDF) 114 Page - STMicroelectronics |
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STM32L443CC датащи(HTML) 114 Page - STMicroelectronics |
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114 / 207 page  Electrical characteristics STM32L443CC STM32L443RC STM32L443VC 114/207 DocID028739 Rev 2 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 19: High-speed external clock source AC timing diagram. Figure 19. High-speed external clock source AC timing diagram Table 42. 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. |
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