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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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CD00237391 датащи(PDF) 82 Page - STMicroelectronics |
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CD00237391 датащи(HTML) 82 Page - STMicroelectronics |
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82 / 177 page  Electrical characteristics STM32F20xxx 82/177 Doc ID 15818 Rev 9 Figure 28. High-speed external clock source AC timing diagram Figure 29. Low-speed external clock source AC timing diagram High-speed external clock generated from a crystal/ceramic resonator The high-speed external (HSE) clock can be supplied with a 4 to 26 MHz crystal/ceramic resonator oscillator. All the information given in this paragraph are based on characterization results obtained with typical external components specified in Table 28. In the application, the resonator and the load capacitors have to be placed as close as possible to the oscillator pins in order to minimize output distortion and startup stabilization time. Refer to the crystal resonator manufacturer for more details on the resonator characteristics (frequency, package, accuracy). ai17528 OSC_IN External STM32F clock source VHSEH tf(HSE) tW(HSE) IL 90% 10% THSE t tr(HSE) tW(HSE) fHSE_ext VHSEL ai17529 OSC32_IN External STM32F clock source VLSEH tf(LSE) tW(LSE) IL 90% 10% TLSE t tr(LSE) tW(LSE) fLSE_ext VLSEL |
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