Process and device allowing a fixed program to be changed.

G - Physics – 06 – F

Patent

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Details

G06F 9/40 (2006.01) G07F 7/10 (2006.01)

Patent

CA 2225786

The invention discloses a device for executing code sequences in a storage medium comprising an integrated circuit (10) capable of executing code sequences and a first memory (12) containing a main programme and optionally other code sequences executable by the integrated circuit, a second non- volatile programmable memory (11) optionally containing code sequences executable by the integrated circuit and a third working memory (14), characterised in that a browser-table contained in the second memory (11) contains at least one field containing a code reference datum. The device includes first means (INS_INT) for: verifying the presence of a code reference, storing in the working memory the address data associated with the code reference and positioning a trap indicator D1 and, second means (INS_ORT) for: testing the trap indicator D1 and, effecting the jump to the address indicated by the contents of the working memory AD_SAUT.

La présente invention concerne un dispositif d'exécution de séquences de code dans un support comprenant un circuit intégré (10) capable d'exécuter des séquences de code et, d'une part, une première mémoire (12) contenant un programme principal et éventuellement d'autres séquences de codes exécutables par le circuit intégré et, d'autre part, une seconde mémoire (11) programmable non volatile contenant éventuellement des séquences de codes exécutables par le circuit intégré et une troisième mémoire de travail (14), caractérisé en ce qu'une table d'orientation contenue dans la seconde mémoire (11) contient au moins un champ contenant une donnée de référence de code: des premiers moyens (INS_INT) permettent: de vérifier la présence d'une référence de code, de mémoriser en mémoire de travail la donnée d'adresse associée à la référence du code et de positionner un indicateur de déroutement DI et des seconds moyens (INS_ORT) permettent: de tester l'indicateur de déroutement DI et d'effectuer le saut à l'adresse pointée par le contenu de la mémoire de travail AD_SAUT.

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