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RM0090: Reference manual - STMicroelectronics

RM0090: Reference manual - STMicroelectronics

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Real-time clock (RTC) <strong>RM0090</strong><br />

The formula to calculate the effective calibrated frequency (FCAL) given the input frequency<br />

(FRTCCLK) is as follows:<br />

F CAL = F RTCCLK x [ 1 + (CALP x 512 - CALM) / (2 20 + CALM - CALP x 512) ]<br />

Calibration when PREDIV_A

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