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 we do not include 16bit or 24bit components, but this limits our 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. To add six 8 bit data 5 adder ICs are not needed anymore. This IC can do it all alone. For any logic operation the regarding mode needs to be selected in the same IC to perform desired operation. It is software defined digital logic design IC. This IC will save time, space & reduce cost in digital circuit designing.