MAXIM DS87C530, DS83C530 User Manual
www.maxim-ic.com
DS87C530/DS83C530
EPROM/ROM Microcontrollers with
Real-Time Clock
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
14 Total Interrupt Sources with Six External
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
7 1 47
8
DALLAS
DS87C530
DS83C530
20
21 33
PLCC, WINDOWED CLCC
39 27
DALLAS
DS87C530
DS83C530
1 13
TQFP
46
34
2640
1452
.
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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REV: 071107
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