DS89C450-QNL中文資料美信數(shù)據(jù)手冊PDF規(guī)格書

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