SEMICONDUCTOR INTEGRATED CIRCUIT

PROBLEM TO BE SOLVED: To detect erroneous operation, even with respect to an attack that makes a plurality of parts misoperate simultaneously. SOLUTION: In this semiconductor integrated circuit, a misoperation processing circuit 1237 includes: a specified period operation circuit (1120) repeatedly calculating a data string generated based on kind data, during a specific period; and a first misoperation detection circuit (4110) detecting that a period needed for the calculation of the data string in operation thereof is different from the specified period. The erroneous operation processing circuit includes a second misoperation detection circuit (4111) detecting that the data that are not generated from the kind data, i.e., abnormal data are obtained in the specified period operation circuit. The misoperation processing circuit also includes a misoperation result processing circuit (1160) restricting the operation of a CPU, when at least one of a first misoperation detection signal and a second misoperation detection signal is asserted. The semiconductor integrated circuit adopts a detection system using a characteristic of state transition of data or periodicity of internal data. COPYRIGHT: (C)2010,JPO&INPIT