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AN4067 Datasheet(PDF) 4 Page - STMicroelectronics

Part # AN4067
Description  Microcontrollers of STM32F0x1
PDF  27 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4067 Datasheet(HTML) 4 Page - STMicroelectronics

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List of figures
AN4067
4/27
DocID022913 Rev 2
List of figures
Figure 1.
Simplified clock tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 2.
HSI oscillator trimming characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 3.
HSI14 oscillator trimming characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 4.
HSI48 oscillator trimming capability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 5.
Timing diagram of internal oscillator calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 6.
Timing diagram of internal oscillator calibration HSI14. . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 7.
Hardware connection using LSE as the reference frequency. . . . . . . . . . . . . . . . . . . . . . . 12
Figure 8.
Hardware connection using external reference frequency . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 9.
Hardware connection For HSI14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 10.
Internal oscillator calibration: finding the minimum frequency error . . . . . . . . . . . . . . . . . . 15
Figure 11.
“Spring loop” . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 12.
HSI calibration flowchart: maximum allowed frequency error . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 13.
Internal oscillator frequency measurement flowchart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 14.
LSI measurement configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 15.
Timing diagram of an internal RC oscillator measurement . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 16.
Internal oscillator calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24



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