Patent ID: 7330921

Claim:
A communication control circuit for controlling sending data to or receiving data from one or more communication nodes connected via a serial bus in synchronous transfer mode based on unique communication cycles, the circuit comprising: a permissible time setting section for setting permissible time for receiving response data corresponding to send data sent to each of the communication nodes; and a response time management section for determining whether the response data received as a response to the send data sent via the serial bus is received within the permissible time calculated by the permissible time calculation section, wherein the permissible time setting section calculates minimum time taken to receive the response data from all the communication nodes on the basis of data length of the send data, data length of the response data, and a number of the communication nodes to which the send data is sent, and sets the permissible time to a value corresponding to one or more communication cycles including the minimum time.