Maxim DS87C530 Clock User Manual


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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
§ 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
DALLAS
DS87C530
DS83C530
34
46
20
8
7 1 47
21 33
PLCC, WINDOWED CLCC
DALLAS
DS87C530
DS83C530
39 27
1 13
2640
1452
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
.
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