Product Summary

80C32-Compatible 
8051 Pin and Instruction Set Compatible 
Four 8-Bit I/O Ports 
Three 16-Bit Timer/Counters 
256 Bytes Scratchpad RAM 
Addresses 64kB ROM and 64kB RAM

Parametrics

http://pdf1.alldatasheet.com/datasheet-pdf/view/98811/MAXIM/DS80C320.html

Features

http://pdf1.alldatasheet.com/datasheet-pdf/view/98811/MAXIM/DS80C320.html

Diagrams

http://pdf1.alldatasheet.com/datasheet-pdf/view/98811/MAXIM/DS80C320.html