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070300

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

FEATURES

§ 80C52-compatible

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8051 pin and instruction set compatible

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Four 8-bit I/O ports

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Three 16-bit timer/counters

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256 bytes scratchpad RAM

§ Large on-chip memory

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16kB program memory

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1kB extra on-chip SRAM for MOVX

§ ROMSIZE feature

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Selects internal ROM size from 0 to 16kB

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Allows access to entire external memory

map

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Dynamically adjustable by software

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Useful as boot block for external FLASH

§ High-speed architecture

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4 clocks/machine cycle (8051 = 12)

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Runs DC to 33MHz clock rates

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Single-cycle instruction in 121ns

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Dual data pointer

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Optional variable length MOVX to access

fast/slow RAM/peripherals

§ Power Management Mode

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Programmable clock source to save power

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CPU runs from (crystal/64) or

(crystal/1024)

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Provides automatic hardware and software

exit

§ EMI Reduction Mode disables ALE

§ Two full-duplex hardware serial ports

§ High integration controller includes:

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Power-Fail Reset

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Early-Warning Power-Fail Interrupt

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Programmable Watchdog Timer

§ 13 total interrupt sources with 6 external

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

44-pin TQFP, and 40-pin windowed CERDIP

§

Factory Mask DS83C520 or EPROM (OTP)

DS87C520

PACKAGE OUTLINE

DS87C520/DS83C520

EPROM/ROM High-Speed Micro

www.maxim-ic.com

PRELIMINARY