Method for storing data in an electrically erasable memory for c

Details Method for storing data in an electrically erasable memory for c Method for storing data in an electrically erasable memory for c

1986-04-15

1989-03-07

Popek, Joseph A.

Static information storage and retrieval

Read/write circuit

Having particular data buffer or latch

365230, G11C 700

Patent

active

048112933

ABSTRACT:
Method and apparatus of storing data in an electrically erasable memory connected to a microprocessor to effectively protect data stored in the memory from being unintentionally overwritten in cases of defective operation of the microprocessor, an overwrite protection system consisting of a write protect flip-flop (1) whose two logical states signify "with write protection" and "without write protction" and also a gate (3) in the write line which is controlled by the write protect flip-flop and in whose logical "with write protection" state, write errors are prevented from being conducted to the individual memory locations, and, finally a mechanical switch element (5) whereby these components are connected in such a manner that the write protect flip-flop (1) can only be brought into the one logical "with write protection" state by the microprocessor, while it can only be brought into the other logical "without write protection" state, if and when the mechanical switch element (5) is actuated. The overwrite protection can apply depending on the embodiment to the entire electronically erasable memory or only to the subareas thereof.

REFERENCES:
patent: 3742458 (1973-06-01), Inoue et al.
patent: 4489380 (1984-12-01), Carey et al.
patent: 4599707 (1986-07-01), Fang
patent: 4638461 (1987-01-01), Yonezu et al.
patent: 4665506 (1987-05-01), Cline et al.

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