![]() ![]() Most real time clock modules have provision for a battery backup, so that they can keep time when the rest of the system is powered down. The device you are using to read this article likely has a real time clock and if you are attached to the Internet you probably are synchronizing this to a network time server (if your device is a phone it may be time synchronized to your telephone companies carrier signal instead). It has its own oscillator that it uses to count time and it has registers that allow you to set the current time and date. Real Time ClocksĪ “real time clock” is essentially a digital clock whose output can be read by a computer or microcontroller. To do that you’ll need to add an external component – a “real time clock”. But you can’t get the time of day or date from them. ![]() You can use the above functions to insert time delays or measure elapsed time.
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