BUS CONNECTION CIRCUIT, SEMICONDUCTOR DEVICE AND OPERATION METHOD OF BUS CONNECTION CIRCUIT FOR MAKING PROCEDURE FOR SWITCHING BETWEEN A 1-CYCLE TRANSFER AND A 2-CYCLE TRANSFER UNNECESSARY

A bus connection circuit connects a bus master and a plurality of bus slaves. The bus connection circuit includes a minor area access detecting circuit and a processing circuit. The minor area access detecting circuit detects that the bus master accesses a minor area of a first bus slave of the plurality of bus slaves, and output a detection signal based on a detection result. The processing circuit executes processing preset in correspondence to the detection result, to an area or data as an access object, based on the detection result.