Write protect mechanism for non-volatile memory

Details Write protect mechanism for non-volatile memory Write protect mechanism for non-volatile memory

1987-07-22

1989-01-03

Fears, Terrell W.

Static information storage and retrieval

Powering

Data preservation

365189, G11C 1300, G11C 1140

Patent

active

047962356

ABSTRACT:
A write protect mechanism for a programmable read-only memory prevents writes to the PROM unless a protect register contains predetermined information. The protect register is itself a write protected control register. The predetermined information cannot be written into the protect register except during a short, predetermined period after the occurrence of an event such as a reset. The protect register may be written to with information other than the predetermined information at any time. The preferred embodiment comprises a single-chip microcomputer with on-board electrically-erasable programmable read-only memory which is write protected in several, separate blocks.

REFERENCES:
patent: 4580246 (1986-04-01), Sibigtroth
patent: 4612632 (1986-09-01), Olson
patent: 4638457 (1987-01-01), Schrenk
patent: 4644494 (1987-02-01), Muller
patent: 4707809 (1987-11-01), Ando

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