Now-a-days, digital circuits are getting more complex. One IC in a digital circuit is used for a fixed purpose and its operation cannot be defined through software. Because of this limitation digital circuit becomes larger in size. When designing an 8bit digital circuit the authors don't include 16bit or 24bit components, but this limits their scope of design and versatility of the design. To overcome this problem an 8bit microcontroller is programmed which is able to do addition, subtraction, multiplication and 28 other digital operations in 8, 16 & 24 bit level.