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The Intel MCS-51 is a Harvard architecture, single chip microcontroller (µC) series which was developed by Intel in 1980 for use in embedded systems. Intel's original versions were popular in the 1980s and early 1990s. While Intel no longer manufactures the MCS-51, binary compatible derivatives remain popular today. Several companies offer MCS-51 derivatives as IP cores for use in FPGAs or ASICs designs.