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Microcontrollers play an important role in embedded system designs. Particularly, Small scale embedded designs which are developed using 8051 and its different versions involve effective designs with low cost. These controllers are having features like inbuilt memories, Timers, Serial control bus etc., but not real time features. To introduce real time features and make fast the serial communication interface among memories the proposed design introduced. The proposed work is the best solution for cost reduction by using low end microcontrollers where high end microcontrollers used.