NONCONTACT COMMUNICATION MEDIUM, MAGNETIC TAPE CARTRIDGE, OPERATION METHOD OF NONCONTACT COMMUNICATION MEDIUM, AND PROGRAM

A noncontact communication medium includes a power generator that generates power with application of an external magnetic field to a coil, a clock signal generator that generates a clock signal using the power, and a processor that operates using the power and executes processing on a command included in the external magnetic field at a processing speed according to a frequency of the clock signal. The clock signal generator generates the clock signal at an activation frequency of the noncontact communication medium, and the processor makes the frequency equal to or lower than a predetermined value in a case where a special command for making the frequency equal to or lower than the predetermined value is included as the command in the external magnetic field after the clock signal is generated at the activation frequency.