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 8051 features:

8-bit CPU optimized for control applications

extensive Boolean processing (single-bit logic) capabilities

64 KB program memory address space

64 KB data memory address space

4 KB of on-chip program memory

128 bytes of on-chip data RAM

32 bi-directional and individually addressable I/O lines

two 16-bit timer/counters

full duplex UART

6-source/5-vector interrupt structure with two priority levels

on-chip clock oscillator

 8051 basic architectural structure:

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