UART (Universal Asynchronous Receiver/Transmitter) is very important for serial communication. The Arduino Uno offers a UART port, providing two options: using the Arduino serial library or diving into the atmega328/P microcontroller registers. Exploring the second method will allow you to handle UART communication accurately, also this code you can port this code on Atmel/Microchip studio.
Keep Learning.
Thanks and Regards,
ucbeginner Team
Did you mean to provide a link - to a tutorial or something? 
The Arduino Serial library is also fine for doing communication with other microcontrollers.
Yes, I can provide link as well as support.
No doubt the Arduino library is fine, but for deep learning, the register-level code is the very best option.
Regards,
I see you've changed the 1st post from the original (as quoted in post #2) to:
Exploring the second method will allow you to handle UART communication accurately
Not sure how using the Arduino Serial library would be inaccurate?
I moved your topic to an appropriate forum category @rizwan1992.
In the future, please take some time to pick the forum category that best suits the subject of your topic. There is an "About the _____ category" topic at the top of each category that explains its purpose.
This is an important part of responsible forum usage, as explained in the "How to get the best out of this forum" guide. The guide contains a lot of other useful information. Please read it.
Thanks in advance for your cooperation.
Microchip Studio can import "normal" Arduino sketches!
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