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AN4631 Datasheet(PDF) 2 Page - STMicroelectronics |
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AN4631 Datasheet(HTML) 2 Page - STMicroelectronics |
2 / 30 page Contents 2/30 DocID027266 Rev 2 Contents 1 STM32L0xx system clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 Internal RC oscillator calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.1 Calibration principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.2 Hardware implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 2.2.1 Case where LSE is used as the reference frequency . . . . . . . . . . . . . . 11 2.2.2 Case where another source is used as the reference frequency . . . . . 12 2.3 Description of the internal oscillator calibration firmware . . . . . . . . . . . . . 13 2.3.1 HSI16/MSI calibration with minimum error . . . . . . . . . . . . . . . . . . . . . . 13 2.3.2 HSI16 calibration with fixed error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 2.3.3 MSI calibration with fixed error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 2.3.4 HSI48 calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 2.3.5 HSI16/MSI frequency measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 2.3.6 HSI16/MSI calibration using calibration curve . . . . . . . . . . . . . . . . . . . . 21 2.4 Recommendations on the use of the calibration library . . . . . . . . . . . . . . 21 2.5 Calibration process performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 2.5.1 Duration of the calibration process . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 3 Internal oscillator measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 3.1 Measurement principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 3.2 Description of the internal oscillator measurement firmware . . . . . . . . . . 26 3.3 Internal oscillator calibration/measurement demo description . . . . . . . . . 26 4 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 5 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 |
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