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STSPIN32F0 データシート(PDF) 27 Page - STMicroelectronics |
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STSPIN32F0 データシート(HTML) 27 Page - STMicroelectronics |
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27 / 40 page  DocID029806 Rev 2 27/40 STSPIN32F0 Device description 40 6.6.3 High-speed external clock source The high-speed external (HSE) clock can be generated from the external clock signal or supplied with a 4 to 32 MHz crystal/ceramic resonator oscillator (see Figure 13). The external clock signal has to respect the I/O characteristics and follows the recommended clock input waveform (refer to Figure 12). Figure 12. HSE clock source timing diagram Figure 13. Typical application with 8 MHz crystal 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. The REXT value depends on the crystal characteristics (refer to the crystal resonator manufacturer for more details on them). |
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