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Some applications need to retain an accurate real-time clock (RTC) through battery changes, power outages, and other events. For these applications, MSP430™ devices that contain the RTC_B Real-Time Clock module with a Battery Backup System can be a great fit. This application note demonstrates how to use RTC_B with Battery Backup Supply functionality to retain the time and keep the RTC counting through loss of main power supply, as well as handling correct reinitialization when the main power supply is restored.