MCS(R) 51 Microcontroller Family User's Manual

The 8051 is the original member of the MCS(R) 51 family, and is the core for all MCS 51 devices. The features of the 8051 core are:

8-bit CPU optimized for control applications
Extensive Boolean processing (Single-bit logic) capabtilties
64K Program Memory address space
64K Data Memory address space
4K bytes of on-chip Program Memory
128 bytes of on-chip Data RAM
32 bidirectional and individually addressable 1/0 lines
Two 16-bit timer/counters
Full duplex UART
6-source/5-vector interrupt structure with two priority levels
On-chip clock oscillator

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