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:
Sep. 22, 2009
Filed:
Feb. 02, 2007
Sylvie Wuidart, Pourrieres, FR;
Sylvie Wuidart, Pourrieres, FR;
STMicroelectronics S.A., Montrouge, FR;
Abstract
A digital processing unit for executing program instructions stored in at least two memories and including at least one first register of temporary storage of the operator of a current instruction to be executed and at least a second register of temporary storage of at least one argument or operand of said current instruction, and a protection circuit for submitting, upstream of the register, the operator to a deciphering function if this operator originates from one of the memories or from an area of these memories, identified from the address provided by a program counter. The present invention also relates to a method for protecting a program for updating an electronic circuit and controlling its execution, including at least one step of ciphering or deciphering of program instruction operators.