Features of the 8051 (MCS 51) family
The key features of 8051 microcontroller are:
8 bit CPU with Boolean processing capabilities.
4K bytes on-chip *program memory.
128 bytes on-chip data memory.
64 Kbytes each program and external data address space.
32 bidirectional I/O lines organized as four 8-bit I/O ports.
serial port – Full duplex UART.
2 16-bit timers/counters.
Two-level prioritized interrupt structure.
Direct byte and bit addressability.
Four register banks.
Binary or decimal arithmetic support.
Hardware multiply and divide operations.
12 clock cycles per machine cycle
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