DESCRIPTION
The DS87C530/DS83C530 EPROM/ROM Micro with Real Time Clock is an 8051-compatible microcontroller based on the Dallas high-speed core. It uses 4 clocks per instruction cycle instead of 12 used by the standard 8051. It also provides a unique mix of peripherals not widely available on other processors. They include an on-chip Real Time Clock (RTC) and battery back up support for an on-chip 1k x 8 SRAM. The new Power Management Mode allows software to select reduced power operation while still processing.

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
    - 16 kB EPROM (OTP)
    - 1 kB extra on-chip SRAM for MOVX
■ ROMSIZE Feature
    - 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 w/ Alarm Interrupt
    - Battery backup support of 1 kB SRAM
■ High-Speed Architecture
    - 4 clocks/machine cycle (8051 = 12)
    - Runs DC to 33 MHz clock rates
    - Single-cycle instruction in 121 ns
    - 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 6 external