The Intel 8051 is a Harvard architecture, single chip microcontroller (µC) which was developed by Intel in 1980 for use in embedded systems. ...
Despite its relatively old age, the 8051 is one of the most popular microcontrollers in use today. Many derivative microcontrollers have since been developed that are based on--and compatible with--the 8051. Thus, the ability to program an 8051 is an important skill for anyone who plans to develop products that will take advantage of microcontrollers.
The 8051 has three very general types of memory. To effectively program the 8051 it is necessary to have a basic understanding of these memory types.
The memory types are illustrated in the following graphic. They are: On-Chip Memory, External Code Memory, and External RAM.
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