1 of 45

REV: 071107

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

FEATURES



80C52 Compatible

8051 Instruction-Set Compatible

Four 8-Bit I/O Ports

Three 16-Bit Timer/Counters

256 Bytes Scratchpad RAM



Large On-Chip Memory

16kB EPROM (OTP)

1kB Extra On-Chip SRAM for MOVX



ROMSIZE Features

Selects Effective On-Chip ROM Size from

0 to 16kB

Allows Access to Entire External Memory Map

Dynamically Adjustable by Software

Useful as Boot Block for External Flash



Nonvolatile Functions

On-Chip Real-Time Clock with Alarm Interrupt

Battery Backup Support of 1kB SRAM



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 Saves Power

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

PIN CONFIGURATIONS

DALLAS

DS87C530

DS83C530

34

46

20

8

7

1

47

21

33

PLCC, WINDOWED CLCC

DALLAS

DS87C530

DS83C530

39

27

1

13

26

40

14

52

TQFP

TOP VIEW

www.maxim-ic.com

DS87C530/DS83C530

EPROM/ROM Microcontrollers with

Real-Time Clock

The High-Speed Microcontroller User’s Guide must

be used in conjunction with this data sheet. Download it

at: www.maxim-ic.com/microcontrollers.