Abstract: This invention relates in general to a portable electronic apparatus comprising in the same microchip a digital processor with cryptography means a large capacity flash memory and a digital signal processor (FIG. 1) which is entirely embedded into a smart card. This said portable electronic apparatus comprises a digital processor (1) linked directly (17) to a large capacity flash memory (2), this said memory (2) linked directly to a digital signal processor (DSP) (3). This said portable electronic apparatus comprises a direct link (19) between the said digital processor (1) and the said digital signal processor (3). This said portable electronic apparatus comprises a signal switch (4) driven by a signal (11) which, according to its value, establishes a contact between the numerical signals (13, 14) with the contacts (10, 12), or a contact between the analog signals (15, 16) with the contacts (10, 12).