Semiconductor device, electronic appliance using semiconductor device, and document using semiconductor device

A semiconductor device comprising:

• an antenna configured to receive carrier waves and convert the carrier waves into an AC signal;
• a rectifier circuit configured to rectify the AC signal into a DC voltage;
• a demodulation circuit configured to demodulate the AC signal into an encoded signal;
• a decoder circuit configured to decode the encoded signal into a decoded signal;
• a first unit configured to generate a first clock signal by supply of the DC voltage;
• a second unit configured to generate a synchronized encoded signal by synchronizing the encoded signal with use of the first clock signal;
• and
• a third unit configured to store data obtained by decoding the synchronized encoded signal in the decoder circuit, with the synchronized encoded signal delayed from the first clock signal utilized as a second clock signal.

A driving method for a semiconductor device including an antenna, a rectifier circuit, a demodulation circuit, an oscillator circuit, a synchronized circuit, a decoder circuit, and a register, comprising the steps of:

• receiving carrier waves;
• converting the carrier waves into an AC signal by the antenna;
• rectifying the AC signal into a DC voltage;
• demodulating the AC signal into an encoded signal;
• generating a first clock signal in the oscillator circuit supplied with the DC voltage;
• generating a synchronized encoded signal by synchronizing the encoded signal with use of the first clock signal;
• supplying the synchronized encoded signal to the decoder circuit and the register;
• decoding the synchronized encoded signal into a digital signal;
• and
• storing the digital signal to the register with use of the synchronized encoded signal delayed from the first clock signal as a second clock signal.