You can access all the features of the chip without delving into the details of register setup and bit setting. We do not replicate libraries of files accessible elsewhere on the Web but do provide links to many of these sites. More than one hundred variants of the 8051 family are in use and additions appear every few months. All are built around the 8051 core so that familiarity with the 8051 chip makes application of newer chips fast and easy. A Harvard architecture.
Separate lines enable code and data memory.
Code memory is read only. Data memory is read or write. A system may have up to 64K bytes of code memory and 64K bytes of data memory. If the lines which enable and are ANDed, the architecture becomes Von Neuman with both data and code in the same memory block of 64K bytes. A full duplex serial port.