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Real-Time Clock 24.5 24.5.1 Initialization/Application Information Flow Chart of RTC Operation Table 24-12 shows the flow chart of a typical RTC operation. Apply RTC Oscillator Clock Configure RTC_CR Configure RTC_DAYS Configure RTC_SECONDS Configure RTC_HOURMIN Configure RTC Alarm Registers Configure RTC_IER Check RTC_ISR Figure 24-12. Flow Chart of RTC Operation 24.5.2 Programming the Alarm or Time-of-Day Registers Use the following procedure illustrated in Figure 24-13 when changing the alarm or time-of-day (day, hour, minute, and second) registers. Disable the alarm interrupt (clear RTC_IER[ALM]) Program the alarm or time-of-day registers Clear any incidental alarm interrupt during programming (write 1 to RTC_ISR[ALM]) Enable the alarm interrupt (set RTC_IER[ALM] Figure 24-13. Flow Chart of Alarm and Time-of-Day Programming MCF5373 Reference Manual, Rev 3 24-12 Freescale Semiconductor
