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AN4631 Folha de dados(PDF) 23 Page - STMicroelectronics

Nome de Peças AN4631
Descrição Electrónicos  How to calibrate an STM32L0xx internal RC oscillator
PDF  30 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4631 Folha de dados(HTML) 23 Page - STMicroelectronics

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23/30
Internal RC oscillator calibration
29
When running the calibration process for the MSI oscillator, the number of steps is equal to
256. If the LSE oscillator is used as the reference frequency (REFERENCE_FREQUENCY =
LSE value / Input capture prescaler = 32768/8 = 4096 Hz) and the selected number of
measured periods is 10, the calibration consumes approximately:
duration = (2 x 11 x 256) / 4096 = 1.4 s
The duration of the calibration process with a maximum allowed error is lower than or equal
to the duration of calibration when using the minimum frequency error process.
Note:
Multiplying by 2 in the duration formula above is due to the fact that there is no
synchronization between the reference signal and the start of counting by the timer.



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