The MCS@51 controllers are optimized for control applications. Byte-processing and numerical operations on small data structures are facilitated by a variety of fast addressing modes for accessing the internal RAM. The instruction set provides a convenient menu of 8-bit arithmetic instructions, including multiply and divide instructions. Extensive on-chip support is provided for one-bit variables as a separate data type, allowing direct bit manipulation and testing in control and logic systems that require Boolean processing.

■ High Performance HMOS Process
■ Internal Timers/Event Counters
■ 2-Level interrupt Priority Structure
■ 32 1/0 Lines (Four 8-Bit Ports)
■ 64K External Program Memory Space
■ Security Feature Protects EPROM Parts Against Software Piracy ■
■ Boolean Processor
■ Bit-Addressable RAM
■ Programmable Full Duplex Serial Channel
■ 111 Instructions (64 Single-Cycle)
■ 64K External Data Memory Space
■ Extended Temperature Range (–40”C to +85”C)