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AN923
Application note
Managing century information using serial real-time clocks and
TIMEKEEPER
®
NVRAMs
By Doug Sams
Introduction
ST's serial real-time clocks (RTCs) and TIMEKEEPER
®
NVRAMs all include at least one byte of year
data in binary-coded decimal (BCD) format. Many devices include additional bits for tracking the
century, effectively extending the year register. Applications can use software to further extend the
century/year data to any desired resolution. The amount of software required depends on the resources
built into the chip and the resolution needed by the application.
January 2015 DocID005227 Rev 4 1/9
www.st.com
