RTC calibration configure register
RTC_CALI_START_CYCLING | 0: one-shot frequency calculation,1: periodic frequency calculation, |
RTC_CALI_CLK_SEL | 0:rtc slow clock. 1:clk_8m, 2:xtal_32k. |
RTC_CALI_RDY | indicate one-shot frequency calculation is done. |
RTC_CALI_MAX | Configure the time to calculate RTC slow clock’s frequency. |
RTC_CALI_START | Set this bit to start one-shot frequency calculation. |