Contactless communication device mode switching management

A method of managing operation of a contactless communication device, the contactless communication device configured to support a card emulation mode using active load modulation (ALM) and a peer to peer mode, and comprising a phase locked loop and a frequency locked loop having in common a same controlled oscillator, the method comprising:

• configuring the contactless communication device as a peer to peer reader, the configuring comprising, without using the phase locked loop, operating the frequency locked loop with a reference clock signal and a frequency set point based on a desired reader carrier frequency and a frequency of the reference clock signal.

A contactless communication device, configured to support a card emulation mode using active load modulation (ALM) and a peer to peer mode, the contactless communication device comprising:

• a configurable module including a phase locked loop and a frequency locked loop having in common a same controlled oscillator, the configurable module having a first card emulation configuration in which the phase locked loop operates and the frequency locked loop operates with a reference clock signal, for synchronizing an ALM carrier frequency with a reader carrier frequency, and a first peer-to-peer configuration in which only the frequency locked loop operates with the reference clock signal and a frequency set point depending on the reader carrier frequency and a frequency of the reference clock signal;
• and
• a controller configured for placing the configurable module in the first card emulation configuration at a beginning of a communication between the contactless communication device and a contactless reader, and for placing the configurable module in the first peer to peer configuration upon reception by the contactless communication device of an indication sent by the contactless reader indicating a further communication in the peer to peer mode with the contactless reader.

A contactless communication device, configured to support a card emulation mode using active load modulation (ALM) and a peer to peer mode, the contactless communication device comprising:

• a configurable module including a phase locked loop and a frequency locked loop having in common a same controlled oscillator, the configurable module having a second card emulation configuration in which only the phase locked loop operates for synchronizing an ALM carrier frequency with a reader carrier frequency, and a first peer-to-peer configuration in which only the frequency locked loop operates with a reference clock signal and a frequency set point depending on the reader carrier frequency and a frequency of the reference clock signal;
• and
• a controller configured for placing the configurable module in the second card emulation configuration at a beginning of a communication between the contactless communication device and a contactless reader, and for placing the configurable module in the first peer-to-peer configuration upon reception by the contactless communication device of an indication sent by the contactless reader indicating a further communication in the peer to peer mode with the contactless reader.

A contactless communication device, configured to support a card emulation mode using active load modulation (ALM) and a peer to peer mode, the contactless communication device comprising:

• a configurable module including a phase locked loop and a frequency locked loop having in common a same controlled oscillator, the configurable module having a second peer to peer configuration in which only the frequency locked loop operates with a reference clock signal and a frequency set point depending on a desired reader carrier frequency and a frequency of the reference clock signal;
• and
• a controller configured for placing the configurable module in the second peer to peer configuration for making the contactless communication device acting as a peer to peer reader.