Another option for real-time clock ICs is the PCF real-time clock IC from NXP — so this is a tutorial on how to use it for time, date, alarm clock and square-wave generation purposes. And please download the data sheet. If you have a pre-made module, you can skip to the next section. Now to get down into the land of I2C once more. When looking through the data sheet NXP mentions two bus addresses, which have the same 7-bits finished with either a 1 for read or 0 for write.
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PCF8563 RTC Board
PCF8563: Real-time clock/calendar
Tutorial – Arduino and PCF8563 real time clock IC