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STM32H723VG Datasheet(PDF) 106 Page - STMicroelectronics |
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STM32H723VG Datasheet(HTML) 106 Page - STMicroelectronics |
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106 / 227 page  Electrical characteristics STM32H723xE/G 106/227 DS13313 Rev 2 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 50: I/O static characteristics. However, the recommended clock input waveform is shown in Figure 14. Figure 14. Low-speed external clock source AC timing diagram Table 31. Low-speed external user clock characteristics(1) 1. Guaranteed by design. 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 VDD -VDD V VLSEL OSC32_IN input pin low level voltage -VSS -0.3 VDD tw(LSEH) tw(LSEL) OSC32_IN high or low time - 250 - - ns 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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