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Real-time clock

Not to be confused with Real-time computing or Real-time communication.
Dallas Semiconductor DS1287 real-time clock manufactured in 1988
Types of hobbyist RTC modules commercially available from China

A real-time clock (RTC) is an electronic device (most often in the form of an integrated circuit) that measures the passage of time.

Although the term often refers to the devices in personal computers, servers and embedded systems, RTCs are present in almost any electronic device which needs to keep accurate time of day.


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