Patent ID: 8538336

Claim:
A radio LSI (large scale integration) device comprising: an RF (radio frequency) transceiver unit having a plurality of radio channels; an RF control unit for selecting one of said plurality of radio channels to set the selected channel as a current transmit/receive channel of said RF transceiver unit; and an interfering wave detecting circuit for detecting an interfering wave, using an RSSI (received signal strength indication) signal of said current transmit/receive channel from said RF transceiver unit, wherein said interfering wave detecting circuit includes a field intensity determiner for determining presence of the interfering wave when a value of said RSSI signal is greater than a predetermined threshold value; a duration counter that counts duration of the interfering wave after said field intensity determiner determines the presence of the interfering wave; and a duration comparator that compares the duration of the interfering wave counted by said duration counter with a predetermined duration comparative value and, if said duration of the interfering wave exceeds said duration comparative value, generates an interrupt signal, and wherein said RF control unit changes the setting of said current transmit/receive channel in response to said interrupt signal, wherein said interfering wave detecting circuit further comprises a field intensity threshold value register for storing said threshold value such that said threshold value is externally settable, and a duration comparative value register for storing said duration comparative value such that said duration comparative value is externally settable, and wherein said duration comparative value is a time corresponding to twice a packet length of a radio signal transmitted/received over said radio channel.