Integrated circuit for a microprocessor-card with multiple programms in programmable memory

Abstract

Abstract The invention relates to an integrated circuit, especially for microprocessor chip cards which have to have several different functionalities at various hierarchical levels. The circuit comprises a microprocessor (10), a read-only memory (12) managing security, an EEPROM (16) memory capable of containing not only data but also code executable by the microprocessor. According to the invention various programmes are placed in the EEPROM memory (areas Z1C, Z2C, Z3C). The read-only memory contains filtering instructions serving for fetching a filter address from a specified area Z1B, Z2B, Z3B of the EEPROM memory. According to the content of this area, the programme will or will not be directed towards the areas Z1C, Z2C, Z3C. It is thus sufficient to pass on a single EEPROM memory address in order to control accessibility to the various functionalities of the circuit.

Inventors

• 👤 François Cabinet BALLOT-SCHMIT Geronimi

Bibliographic Details