A slave can take any of a start state in which the slave can communicate with a master, a communication control state in which at least the slave can receive a start request signal transmitted by the master and makes a transition to the start state upon reception of the start request signal, or a standby...http://www.google.fr/patents/US7065391?utm_source=gb-gplus-shareBrevet US7065391 - Communication system, communication apparatus, and communication control method
Communication system, communication apparatus, and communication control method