Method of communication between a smart card and a host station
View Patent ↗A card-like portable article having a microcontroller comprises a memory that contains a set of instructions allowing the microcontroller to communicate in accordance with a first communication protocol. The card-like portable article further comprises an interface for converting commands in accordance with the first communication protocol into commands in accordance with a second communication protocol and vice versa. Preferably, the first communication protocol is in conformity with the ISO 7816-3 standard and the second communication protocol is in conformity with the USB standard.
1. A method of communication between a host station and a portable article having a microcontroller, said portable article being in the form of a unitary assembly and being connected by a bus system to said host station, wherein the method includes:
a conversion of data received in accordance with a second communication protocol into data in accordance with a first communication protocol and vice versa,
a step whereby the host station communicates a specific request to the portable article having a microcontroller, the specific request being an IsReady( ) request which serves to prevent the host station triggering a low power consumption mode of operation in the portable article, and
a step wherein the portable article sends an OS-STATUS answer to the host station in response to the request enabling said station to trigger a low power consumption mode in said portable article, said response being encoded in such a manner as to define a current status of the portable article.
2. The method according to claim 1 , wherein the bus system is a universal serial bus USB system and in that the specific request is communicated to the portable article having the microcontroller using the control transfer mode of said system.
3. The method according to claim 1 , wherein the current status of the portable article is a mute status or a status in which the card is currently processing.
4. The method according to claim 1 , wherein the portable article having a microcontroller is a microcontroller card.
5. The method according to claim 1 , wherein the microcontroller of the card includes a non-volatile memory which contains an operating system suitable for communicating by means of a protocol that implements Application Protocol Data Unit (“APDU”) commands defined in the ISO 7816 standard.