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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM32F334X4 датащи(PDF) 64 Page - STMicroelectronics |
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STM32F334X4 датащи(HTML) 64 Page - STMicroelectronics |
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64 / 115 page  Electrical characteristics STM32F334x4 STM32F334x6 STM32F334x8 64/115 DocID025409 Rev 5 Figure 13. High-speed external clock source AC timing diagram 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 6.3.14. However, the recommended clock input waveform is shown in Figure 14 Table 36. 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, not tested in production. - 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 Table 37. Low-speed external user clock characteristics Symbol Parameter Conditions Min. Typ. Max. Unit fLSE_ext User External clock source frequency(1) 1. Guaranteed by design, not tested in production. - - 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(1) 450 - - ns tr(LSE) tf(LSE) OSC32_IN rise or fall time(1) -- 50 |
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