The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 14, 1999
Filed:
Dec. 19, 1997
Jean-Marie Gaultier, Rousset, FR;
SGS-Thomson Microelectornics S.A., Saint Genis, FR;
Abstract
The invention relates to memories associated with the central processing units of microcomputers and more particularly, in such memories, to an architecture and device used to protect certain zones of the memory against unauthorized reading operations. The zones of the memory to which access must be authorized to fulfill certain functions are listed by codes recorded in a first memory. Access to these zones is authorized only if the central processing unit gives corresponding codes through a second memory whose contents are compared with those of the first memory. The invention can be applied to microcomputers and microcontrollers, especially those used in mobile telephone sets.