A MICROCONTROLLER INCLUDING A SINGLE MEMORY MODULE HAVING A DATA MEMORY SECTOR AND A CODE MEMORY SECTOR AND SUPPORTING SIMULTANEOUS READ/WRITE ACCESS TO BOTH SECTORS

摘要

A microcontroller (1) having a special function register to internally select between internal memory and external memory on the fly. Two data pointers (41, 43) in conjunction with the special function register result in four effective quick reference locations. The internal memory (67) consists of one memory module having its array subdivided into a data memory store (37) and a code memory store (35), and having a bank of pass devices (73) to selectively isolate the code memory store from the data memory store. The present memory (67) can further support concurrent writing to the data memory store (37) while reading from the code memory store (35).