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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.^[1]^[2] 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.

^ John Wharton: An Introduction to the Intel^® MCS-51^TM Single-Chip Microcomputer Family, Application Note AP-69, May 1980, Intel Corporation.
^ John Wharton: Using the Intel^® MCS-51^TM Boolean Processing Capabilities, Application Note AP-70, May 1980, Intel Corporation.

[1] John Wharton: An Introduction to the Intel^® MCS-51^TM Single-Chip Microcomputer Family, Application Note AP-69, May 1980, Intel Corporation.

[2] John Wharton: Using the Intel^® MCS-51^TM Boolean Processing Capabilities, Application Note AP-70, May 1980, Intel Corporation.

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