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Basic function:

1.8-bit data bus, 16-bit address bus CPU;

2. Has Boolean processing ability and bit processing ability;

3. Using Harvard structure, the address space of program memory and data memory is independent, which is convenient for program design;

4. 64KB program memory and 64KB data memory with the same address;

5.0-8KB in-chip program memory (8031 no, 8051 4KB, 8052 8KB, 89C55 20KB); < br />
6.128-byte in-chip data storage (8051 has 256 bytes);

7.32 bidirectional and addressable I/O lines;

8. Two 16-bit timers/counters (3 in 8052);

9. A full duplex serial I/O interface;

10. The interrupt structure of multiple interrupt sources has two interrupt priorities;

11. On-chip clock oscillator & nbsp; & nbsp;.

Characteristics:

1. Take microprocessor (CPU) as the core;

2. CPU is connected with other components through three buses.

Bus: An information transmission line that serves multiple components.