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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM32MP151C датащи(PDF) 143 Page - STMicroelectronics |
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STM32MP151C датащи(HTML) 143 Page - STMicroelectronics |
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143 / 253 page  DS12501 Rev 3 143/253 STM32MP151C/F Electrical characteristics 232 6.3.8 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 I/O. Digital and analog bypass modes are available. The external clock signal has to respect the Table 50: I/O static characteristics. However, the recommended clock input waveform is shown in Figure 15 for digital bypass mode and in Figure 16 for analog bypass mode. In analog bypass mode the clock can be a sinusoidal waveform. Figure 15. High-speed external clock source AC timing diagram (digital bypass) 2. Including the tSEL_VDDCORETEMPO = 234 μs. Table 28. High-speed external user clock characteristics (digital bypass)(1) 1. Guaranteed by design. Symbol Parameter Min Typ Max Unit fHSE_ext User external clock source frequency 8 24 48 MHz VSW (VHSEH -VHSEL) OSC_IN amplitude 0.7×VDD -VDD V VDC OSC_IN input voltage VSS -0.3×VSS tW(HSE) OSC_IN high or low time 7 - - ns ai17528b OSC_IN External STM32 clock source VHSEH tf(HSE) tW(HSE) IL 90 % 10 % THSE t tr(HSE) tW(HSE) fHSE_ext VHSEL |
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