Patent ID: 8762590

Claim:
A communication system for a Consumer Electronics Control (CEC) channel of a High-Definition Multimedia Interface (HDMI) communication interface being switchable between an active condition and a standby condition, said system comprising: a communication module for receiving messages from said CEC channel, said communication module including a timer, a processing unit for processing said received messages, and an oscillator separate from said timer for driving said communication module and providing a clock signal to said timer, wherein said system is configured for: when said interface is in said active condition: activating said timer when the beginning of a transmission of a first message is detected on said CEC channel, detecting the transmission start bit of said first message via said timer using a first plurality of reference values, reconstructing and processing said first message, and detecting the presence of other remaining activities to be performed and, in the absence of other remaining activities, switching said interface from said active condition to said standby condition by means of a deactivation of said oscillator, and when said interface is in said standby condition: switching said interface from said standby condition to said active condition when the beginning of a transmission of a second message is detected on said CEC channel by activating said timer and said oscillator, detecting the transmission start bit of said second message via said timer using a second plurality of reference values, wherein said second reference values are different from said first reference values, reconstructing and processing said second message, wherein the reference values comprise timer count values.