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STM32L471RG データシート(PDF) 125 Page - STMicroelectronics |
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STM32L471RG データシート(HTML) 125 Page - STMicroelectronics |
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125 / 218 page  DocID027226 Rev 1 125/218 STM32L471xx Electrical characteristics 199 Note: For information on selecting the crystal, refer to the application note AN2867 “Oscillator design guide for ST microcontrollers” available from the ST website www.st.com. Figure 18. Typical application with a 32.768 kHz crystal Note: An external resistor is not required between OSC32_IN and OSC32_OUT and it is forbidden to add one. 1. Guaranteed by design. 2. Refer to the note and caution paragraphs below the table, and to the application note AN2867 “Oscillator design guide for ST microcontrollers”. 3. tSU(LSE) is the startup time measured from the moment it is enabled (by software) to a stabilized 32.768 kHz oscillation is reached. This value is measured for a standard crystal and it can vary significantly with the crystal manufacturer |
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