Microcontroller having a non-volatile memory and a method for se

Details Microcontroller having a non-volatile memory and a method for se Microcontroller having a non-volatile memory and a method for se

1998-06-03

1999-12-28

Nelms, David

Static information storage and retrieval

Floating gate

Data security

36518505, G11C 1604

Patent

active

06009012&

ABSTRACT:
A method for automatically detecting a programmed status of a non-volatile memory and selecting one of multiple operational modes based on that status. In one embodiment a non-volatile memory (102) has a normal and an access restricted operational mode. The memory is placed in the access restricted operational mode once it is programmed in order to prevent unauthorized access to the programmed data. A detection logic (226) determines whether the non-volatile memory is in a non-programmed state. Based on this detection it is determined whether the non-volatile memory is to be placed in a normal or an access restricted operational mode. The invention relates also to determining an operational mode of the microcontroller which can advantageously be incorporated into an assembled electronic device.

REFERENCES:
patent: 3978454 (1976-08-01), Willard
patent: 5239656 (1993-08-01), Kawano
patent: 5495593 (1996-02-01), Elmer et al.
patent: 5652886 (1997-07-01), Tulpule et al.

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