Configuration of a transaction in a contactless electronic device

1. A method, comprising:

configuring a contactless communication device that includes a contactless communication circuit, a memory, and at least two applications compatible with different communication protocols, the memory includes, for each application, a configuration for at least one identifier of the communication protocol with which the application is compatible;

transmitting, by the contactless communication circuit, to a proximity coupling reader data of the configuration during an existing transaction initiated by the proximity coupling reader;

initiating with a proximity coupling reader a new transaction by stopping, by the contactless communication circuit, a transmission of answers of the contactless communication device to requests by the proximity coupling reader during the existing transaction; and

changing, by the contactless communication circuit, the configuration for the new transaction initiated by the proximity coupling reader, the configuration depends on a frequency of use of each configuration.

2. The method of claim 1 wherein the configuration which is used by the contactless communication circuit at the new transaction initiated by the reader depends on a current date.

3. The method of claim 1 wherein the configuration which is used by the contactless communication circuit at the new transaction initiated by the reader depends on a time.

4. The method of claim 1 wherein the configuration which is used by the contactless communication circuit at the new transaction initiated by the reader depends on a frequency of use of each configuration.

5. The method of claim 1 , further comprising detecting, by the contactless communication circuit, an interruption of the transaction initiated by the reader.

6. A method, comprising:

emitting a request by a proximity coupling device in response to a load in a field of the proximity coupling device;

receiving by the proximity coupling device a reply;

imitating an anticollision procedure in response to the reply by receiving a select acknowledge and an identifier at the proximity coupling device;

determining a protocol of communication from the select acknowledge and in response to the identifier being complete;

establishing communication with a first protocol in response to the select acknowledge; and

beginning communication with a second protocol that is different than the first protocol.

7. A device, comprising:

a first integrated circuit hosting a first application compatible with a first communication protocol;

a second integrated circuit hosting a second application compatible with a second communication protocol that is different from the first communication protocol;

a memory in which is stored, for each application, a configuration for a contactless communication; and

a contactless communication circuit configured to:

stop a transmission of answers of a contactless communication device in response to a received reader request during a transaction;

transmit to data of one of the configurations during the transaction; and

change the configuration used in response to a new transaction.

8. The device of claim 7 wherein the configuration is used by the contactless communication circuit at the new transaction depends on at least one of a frequency of use of each configuration or a position of the contactless communication device.

9. The device of claim 8 wherein the configuration includes at least one identifier of the communication protocol with which the application is compatible.

10. The device of claim 8 where the received reader request is configured to cause initiation of the new transaction.