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AN4631 Datasheet(PDF) 6 Page - STMicroelectronics

Part # AN4631
Description  How to calibrate an STM32L0xx internal RC oscillator
PDF  30 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4631 Datasheet(HTML) 6 Page - STMicroelectronics

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STM32L0xx system clock
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DocID027266 Rev 2
The STM32L0xx devices also have three secondary clock sources (that cannot be used as
system clock sources):
•
37 kHz Low-Speed Internal (LSI) RC which is designed to drive the independent
watchdog and optionally the Real Time Clock (RTC). The LSI oscillator cannot be
calibrated, but can be measured to evaluate frequency deviations (due to temperature
and voltage changes)
•
32.768 kHz Low-Speed External crystal (LSE crystal) which optionally drives the Real
Time Clock (RTC)
•
48MHz High-Speed Internal (HSI48) which is designed to provide a high precision
clock to the USB peripheral by means of a special Clock Recovery System (CRS)
circuitry



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