21.4.2.1 Prescaler

The RTC prescaler divides the source clock for the RTC counter.

Note: In Clock/Calendar mode, the prescaler must be configured to provide a 1 Hz clock to the counter for correct operation.

The frequency of the RTC clock (CLK_RTC_CNT) is given by the following formula:

f_{CLK_RTC_CNT} = \frac{f_{CLK_RTC_OSC}}{2^{PRESCALER}}

The frequency of the oscillator clock, CLK_RTC_OSC, is given by f_{CLK_RTC_OSC}, and f_{CLK_RTC_CNT} is the frequency of the internal prescaled RTC clock, CLK_RTC_CNT.

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