DS87C530-KCL

The DS87C530 is an 8051 compatible microcontroller based on the Dallas High Speed core. It uses four 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
– 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
• ROMSIZETM 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 1KB 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
• High integration controller includes:
– Power–fail reset
– Early–warning power–fail interrupt
– Programmable Watchdog timer
• Two full–duplex hardware serial ports
• 14 total interrupt sources with 6 external