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REV: 022207

Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device

FEATURES



80C52 Compatible

8051 Pin- and Instruction-Set Compatible

Four 8-Bit I/O Ports

Three 16-Bit Timer/Counters

256 Bytes Scratchpad RAM



Large On-Chip Memory

16kB Program Memory

1kB Extra On-Chip SRAM for MOVX



ROMSIZE Feature

Selects Internal ROM Size from 0 to 16kB

Allows Access to Entire External Memory Map

Dynamically Adjustable by Software

Useful as Boot Block for External Flash



High-Speed Architecture

4 Clocks/Machine Cycle (8051 = 12)

Runs DC to 33MHz Clock Rates

Single-Cycle Instruction in 121ns

Dual Data Pointer

Optional Variable Length MOVX to Access

Fast/Slow RAM/Peripherals



Power Management Mode

Programmable Clock Source to Save Power

CPU Runs from (crystal/64) or (crystal/1024)

Provides Automatic Hardware and Software Exit



EMI Reduction Mode Disables ALE



Two Full-Duplex Hardware Serial Ports



High Integration Controller Includes:

Power-Fail Reset

Early-Warning Power-Fail Interrupt

Programmable Watchdog Timer



13 Interrupt Sources with Six External



Available in 40-pin PDIP, 44-Pin PLCC, 44-Pin

TQFP, and 40-Pin Windowed CERDIP



Factory Mask DS83C520 or EPROM (OTP)

DS87C520

PIN CONFIGURATIONS

DS87C520/DS83C520

EPROM/ROM High-Speed Microcontrollers

www.maxim-ic.com

TOP VIEW

The High-Speed Microcontroller User’s Guide must be used in

conjunction with this data sheet. Download it at:

www.maxim-ic.com/microcontrollers.