2.3.2. Clock signals

The period of the clock signal CLK1HZ must be selected to determine the resolution of the RTC. For example, selecting a 1Hz clock signal produces a one second counter resolution.

There is a constraint on the ratio of clock frequencies for PCLK to CLK1HZ. The frequency of PCLK must be greater than three times the frequency of CLK1HZ.

FPCLK > 3 × FCLK1HZ.

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