MAXIM DS87C520, DS83C520 User Manual

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DS87C520/DS83C520

EPROM/ROM High-Speed Microcontroller

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

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

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

may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata

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