휘발성 데이타 메모리의 불휘발성 프로그램 메모리化에 관한 一方案 = A Method of making Non-volatile Alterable Program Memory using Volatile Data Memory

다국어 초록 (Multilingual Abstract)

A simple and general purposed nonvolatile read-write-memory system applicable to any circuit in place of EAROM, which is very complicated and difficult to use because of its diverse voltages, timing and control signals, is suggested in this paper.
Using CMOS RAM and rechargeable battery back up, we can modify easily the data table or even the program memory in circuit without extracting memory devices.
It is convenient for the equipments containing time variant parameters or data in its program.
It is also examined how long the data can be retained when the back up supply recharged for once.
Since this system recharges the back up supply whenever the main voltage source is used, the retention of data is almost everlasting.