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STM32F407IGH6 数据表(PDF) 97 Page - STMicroelectronics |
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STM32F407IGH6 数据表(HTML) 97 Page - STMicroelectronics |
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97 / 185 page  DocID022152 Rev 4 97/185 STM32F405xx, STM32F407xx Electrical characteristics Figure 30. High-speed external clock source AC timing diagram Figure 31. 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 31. 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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