DS87C520/DS83C520
EPROM/ROM High-Speed Microcontrollers
www.maxim-ic.com
FEATURES
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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
PIN CONFIGURATIONS
TOP VIEW
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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
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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
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DALLAS is a registered trademark of Dallas Semiconductor Corp.
MAXIM is a registered trademark of Maxim Integrated Products, Inc.
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:
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REV: 040104
DALLAS [ DALLAS SEMICONDUCTOR ]
