What is a Real-time clock?

These are clock functions that are used by various machines to measure the time when the power of the main device is turned off. They can be found in any electronic device that measures time. They are often found in servers, computers, and embedded systems.

The real-time clocks are battery-powered clocks included in a microchip in the motherboard. It is usually called the CMOS, and a small memory on the chip stores the setup values. They can help in freeing the primary system from critical tasks and are more accurate than other methods.

There are two main types of real-time clocks:

Radio-based real-time clocks

Few computers can receive clock information over digital radio and can show time standards. 

Software-based real-time clocks

The software can use the required algorithm and convert any RTC into an accurate one.

Applications

Real-time clocks have several industrial applications. Industrial uses include Point of Sale equipment, utility meters, gaming machines, fire alarms, video security, etc. It is also used in consumer applications like mobile game devices, television sets, digital cameras, DVD recorders, GPS systems, etc.

They are also used in several IoT and other automation applications. Several remote IoT sensors and weather stations still use this device.