Encryption code processing circuit, operation device and electronic apparatus

An operation device comprising:

• a rewritable ferroelectric memory including an encryption table containing one or more command codes paired with encryption codes that are the command codes encrypted, a first region for storing the encryption codes, and a second region for storing the command codes, wherein, when the encryption code is stored in the first region, the encryption table is searched through, and the command code pairing with the encryption code is outputted to the second region, and when the command code is stored in the second region, the encryption table is searched through, and the encryption code pairing with the command code is outputted to the first region;
• a program memory for storing one or more of the encryption codes;
• a command register to which the encryption codes are successively transferred from the program memory;
• a command decoder to which, after the encryption code transferred to the command register is inputted to the first region of the ferroelectric memory, the command code outputted to the second region of the ferroelectric memory is transferred;
• and
• an arithmetic logic operation unit that executes arithmetic logic operation based on the command code transferred to the command decoder.