GENERAL DESCRIPTION
The DS89C430, DS89C440, and DS89C450 offer the highest performance available in 8051-compatible microcontrollers. They feature newly designed processor cores that execute instructions up to 12 times faster than the original 8051 at the same crystal speed. Typical applications will experience a speed improvement up to 10x. At 1 million instructions per second (MIPS) per megahertz, the microcontrollers achieve 33 MIPS performance from a maximum 33MHz clock rate.

FEATURES
■ High-Speed 8051 Architecture
    One Clock-Per-Machine Cycle
    DC to 33MHz Operation
    Single Cycle Instruction in 30ns
    Optional Variable Length MOVX to Access Fast/Slow Peripherals
    Dual Data Pointers with Automatic Increment/Decrement and Toggle Select
    Supports Four Paged Memory-Access Modes
■ On-Chip Memory
    16kB/32kB/64kB Flash Memory
    In-Application Programmable
    In-System Programmable Through Serial Port
    1kB SRAM for MOVX
■ 80C52 Compatible
    8051 Pin and Instruction Set Compatible
    Four Bidirectional, 8-Bit I/O Ports
    Three 16-Bit Timer Counters
    256 Bytes Scratchpad RAM
■ Power-Management Mode
    Programmable Clock Divider
    Automatic Hardware and Software Exit
■ ROMSIZE Feature
    Selects Internal Program Memory Size from 0 to 64kB
    Allows Access to Entire External Memory Map
    Dynamically Adjustable by Software
■ Peripheral Features
    Two Full-Duplex Serial Ports
    Programmable Watchdog Timer
    13 Interrupt Sources (Six External)
    Five Levels of Interrupt Priority
    Power-Fail Reset
    Early Warning Power-Fail Interrupt
    Electromagnetic Interference (EMI) Reduction