DS89C450-QNL中文资料美信数据手册PDF规格书

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