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:
Aug. 21, 2007
Filed:
Aug. 06, 2003
Microprocessor circuit for data carriers and method for organizing access to data stored in a memory
Franz-josef Brücklmayr, Kaufering, DE;
Hans Friedinger, München, DE;
Holger Sedlak, Egmating, DE;
Christian May, München, DE;
Franz-Josef Brücklmayr, Kaufering, DE;
Hans Friedinger, München, DE;
Holger Sedlak, Egmating, DE;
Christian May, München, DE;
Infineon Technologies AG, Munich, DE;
Abstract
A microprocessor circuit for organizing access to data or programs stored in a memory has a microprocessor, a memory for storing an operating system, and a memory for storing individual external programs. A plurality of memory areas with respective address spaces is provided in the memory for storing the external programs. Each address space is assigned an identifier. The identifier assigned to a memory area is loaded into a first auxiliary register prior to the addressing of the memory area and the identifier of the addressed memory area is loaded into a second auxiliary register. A comparison of the contents of the first and second auxiliary registers is performed. Furthermore, each address space of a memory area is assigned at least one bit sequence defining access rights, whereby code instructions and sensitive data can be protected against write accesses from other external programs.