DS87C520

DS87C520/DS83C520 EPROM/ROM High-Speed Microcontrollers www.maxim-ic.com FEATURES  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 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 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-...