Patent ID: 7783908

Claim:
A method of communication in a multi-master system comprising: sending communication signals switched between dominant and recessive values at clock intervals in frames over a serial data bus from at least one of a plurality of sending nodes to a plurality of receiving nodes said frames including an identifier field, and said receiving nodes having an operational state and a standby state in which the current consumption of the node is reduced compared to said operational state, said receiving nodes including wake-up trigger circuitry for triggering transition from said standby state to said operational state in response to said communication signals; wherein said identifier field includes at least one position at which said communication signal remains at said recessive value during at least two successive clock intervals so as to define an identifier code, and said trigger circuitry is selectively responsive to said position for triggering said transition from said standby state to said operational state, the trigger circuitry of at least one of said receiving nodes being responsive to more than one different identifier code so as to be capable of being triggered by any one of a plurality of sending nodes.