Patent ID: 8144013

Claim:
A semiconductor device comprising: an antenna configured to transmit a wireless signal to a communication device and receive a wireless signal from the communication device; and first, second, third, and fourth functional circuits electrically connected to the antenna, the first functional circuit comprising: a logic circuit; a determination circuit configured to output a determination signal depending on whether the logic circuit is normally operated or not; a power supply circuit configured to supply power supply voltage to the logic circuit; and a power supply control circuit configured to control power supply voltage output from power supply circuits included in the second, third and fourth functional circuits based on operations of the determination circuit and the power supply circuit included in the first functional circuit, the second functional circuit comprising: a determination circuit; and a power supply control circuit configured to control power supply voltage output from the power supply circuits in the third and fourth functional circuits based on operations of the determination circuit and the power supply circuit included in the second functional circuit, and the third functional circuit comprising: a determination circuit; and a power supply control circuit configured to control power supply voltage output from the power supply circuit in the fourth functional circuit based on operations of the determination circuit and the power supply circuit included in the third functional circuit.