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REV: 070505

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.

FEATURES

§ 87C52 Compatible

-

8051 pin and instruction set compatible

-

Three 16-bit timer/counters

-

256 bytes scratchpad RAM

§ On-Chip Memory

-

8kB EPROM (OTP & Windowed Packages)

-

1kB extra on-chip SRAM for MOVX access

§ On-Chip Analog-to-Digital Converter

-

Eight channels of analog input, 10-bit

resolution

-

Fast conversion time

§ Pulse-Width Modulator Outputs

-

Four channels of 8-bit PWM

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Channels cascadable to 16-bit PWM

§ Four Capture plus Three Compare Registers

§ 55 I/O Port Pins

§ New Dual Data Pointer Operation

-

Either data pointer can be incremented or

decremented

§ ROMSIZE Feature

-

Sets effective on-chip ROM size from 0 - 8kB

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Allows access to entire external memory map

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Dynamically adjustable by software

§ High-Speed Architecture

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4 clocks/machine cycle (8051 = 12)

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Runs DC to 33MHz clock rates

-

Single-cycle instruction in 121ns

-

New Stretch Cycle feature allows access to

fast/slow memory or peripherals

§ Unique Power Savings Modes

§ EMI Reduction Mode Disables ALE if Not

Needed

§ High-Integration Controller Includes:

-

Power-fail reset

-

Early-warning power-fail interrupt

-

Two full-duplex hardware serial ports

-

Programmable watchdog timer

§ 16 Total Interrupt Sources with Six External

§ Available in 68-Pin PLCC, 80-Pin PQFP, and

68-Pin Windowed CLCC

The High-Speed Microcontroller User’s Guide and High-Speed

Microcontroller User’s Guide: DS87C550 Supplement must be used

in conjunction with this data sheet. Download them at

www.maxim-ic.com/user_guides.

PIN CONFIGURATIONS

DS87C550

EPROM High-Speed Microcontroller

with ADC and PWM

www.maxim-ic.com

9

1

61

27

43

10

26

60

44

PLCC, Windowed CLCC

DS87C550

1

24

64

41

40

25

65

80

DS87C550

PQFP

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