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AN2629 Datasheet(PDF) 21 Page - STMicroelectronics

Part # AN2629
Description  low-power modes
PDF  43 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2629 Datasheet(HTML) 21 Page - STMicroelectronics

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AN2629
Backup registers (BKP)
Doc ID 13922 Rev 2
21/43
4.4
RTC calibration
For measurement purposes, the 32.768 kHz RTC clock can be output on the TAMPER pin.
This is enabled by setting the CCO bit in the RTC clock calibration register (BKP_RTCCR).
The clock can be slowed down by up to 121 ppm by configuring CAL[6:0] bits.



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