RTC_CTRL_B_DM
ctrlb &= ~(RTC_CTRL_B_DM);
ctrlb |= RTC_CTRL_B_DM;
ctrlb &= ~(RTC_CTRL_B_DM);
ctrlb |= RTC_CTRL_B_DM;
ctrlb &= ~(RTC_CTRL_B_DM);
ctrlb |= RTC_CTRL_B_DM;
((ctrlb & RTC_CTRL_B_DM) ? "binary" : "BCD"),