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The instructions used by Atmel 89CXX and 89CXXXX are the same or subset of 8051 microcontrollers.

  • Fully static operation,
  • flash program memory,
  • less pin count and
  • precision analog comparator ( in case of 89C20510)

are some of the attractions in going for these microcontrollers. Due to many similar features in the architecture and instruction and instruction set as that of 8051, it becomes possible for the 8051 designer to directly start using 89CXX and 89C20XX microcontrollers without any more efforts in learning these microcontrollers.

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Q: Differences between Intel 8051 and atmel 89c51 micro controller?
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