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STM32L412R8Y6PXXX 数据表(PDF) 118 Page - STMicroelectronics |
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STM32L412R8Y6PXXX 数据表(HTML) 118 Page - STMicroelectronics |
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118 / 192 page  Electrical characteristics STM32L412xx 118/192 DS12469 Rev 8 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 24. 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 MS30253V2 OSC32_IN OSC32_OUT Drive programmable amplifier fLSE 32.768 kHz resonator Resonator with integrated capacitors CL1 CL2 |
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