RTC_CTRL_B_SET
(rtc->read(rtc, RTC_CTRL_B) | RTC_CTRL_B_SET));
(rtc->read(rtc, RTC_CTRL_B) & ~(RTC_CTRL_B_SET)));
(rtc->read(rtc, RTC_CTRL_B) | RTC_CTRL_B_SET));
(rtc->read(rtc, RTC_CTRL_B) & ~(RTC_CTRL_B_SET)));