This project was actually made for one of my college assignments. I decided to use Atmega because it is widely available and it is easy to burn with the help Arduino Uno Kit.
Conclusion: A two digit Up-Down counter was made with the help of Atmega328p Microcontroller and a 4-Digit 7 Segment Display. The counter in default mode operated as an Up-Counter. To operate it in down counter mode we need to press RESET push Button and the hold the Down-Count Push Button.