Communication method and communication system
First Claim
Patent Images
1. A communication system comprising:
- a reader/writer; and
a semiconductor device having a power supply circuit being configured to supply power supply voltage and a signal processing circuit including a storage circuit,wherein the storage circuit includes a capacitor and a transistor having a channel comprising an oxide semiconductor,wherein one of electrodes of the capacitor is electrically connected to one of a source and a drain of the transistor via a holding node, andwherein the storage circuit is configured to store data after a signal potential corresponding to the data is input to the holding node, the transistor is turned off, and the holding node is set in a floating state.
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Abstract
A command sequence is restarted from the middle even when supply of power supply voltage to an internal circuit in a wireless tag is temporarily stopped (a power flicker occurs). A register or a cache memory included in a signal processing circuit in the wireless tag continues to retain data even after the supply of power supply voltage is stopped. After the power flicker occurs, the signal processing circuit in the wireless tag is returned to the state before the supply of power supply voltage is stopped and can restart signal processing. Consequently, the command sequence can be restarted from the middle.
130 Citations
30 Claims
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1. A communication system comprising:
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a reader/writer; and a semiconductor device having a power supply circuit being configured to supply power supply voltage and a signal processing circuit including a storage circuit, wherein the storage circuit includes a capacitor and a transistor having a channel comprising an oxide semiconductor, wherein one of electrodes of the capacitor is electrically connected to one of a source and a drain of the transistor via a holding node, and wherein the storage circuit is configured to store data after a signal potential corresponding to the data is input to the holding node, the transistor is turned off, and the holding node is set in a floating state. - View Dependent Claims (2, 3, 4, 5)
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6. A communication system comprising:
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a reader/writer configured to transmit a command and receive a response; and a semiconductor device configured to receive the command and transmit the response, the semiconductor device having a power supply circuit configured to supply power supply voltage and a signal processing circuit, wherein the signal processing circuit comprises a storage circuit, wherein the storage circuit includes a capacitor and a transistor having a channel comprising an oxide semiconductor, wherein one of electrodes of the capacitor is electrically connected to one of a source and a drain of the transistor via a holding node, and wherein the storage circuit is configured to store data after a signal potential corresponding to the data is input to the holding node, the transistor is turned off, and the holding node is set in a floating state. - View Dependent Claims (7, 8, 9, 10)
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11. A communication system comprising:
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a reader/writer configured to transmit a command and receive a response; and a semiconductor device configured to receive the command and transmit the response, the semiconductor device having a power supply circuit configured to supply power supply voltage and a signal processing circuit, wherein the signal processing circuit comprises a flip-flop and a storage circuit configured to store data retained in the flip-flop, wherein the storage circuit includes a capacitor and a transistor having a channel comprising an oxide semiconductor, wherein one of electrodes of the capacitor is electrically connected to one of a source and a drain of the transistor via a holding node, and wherein the storage circuit is configured to store the data after a signal potential corresponding to the data is input to the holding node, the transistor is turned off, and the holding node is set in a floating state. - View Dependent Claims (12, 13, 14, 15)
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16. A semiconductor device comprising:
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a power supply circuit configured to supply power supply voltage; and a signal processing circuit including a storage circuit, wherein the storage circuit includes a capacitor and a transistor having a channel comprising an oxide semiconductor, wherein one of electrodes of the capacitor is electrically connected to one of a source and a drain of the transistor via a holding node, and wherein the storage circuit is configured to store data after a signal potential corresponding to the data is input to the holding node, the transistor is turned off, and the holding node is set in a floating state. - View Dependent Claims (17, 18, 19, 20)
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21. A semiconductor device comprising:
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a power supply circuit configured to supply power supply voltage; and a signal processing circuit, wherein the semiconductor device is configured to receive a command and transmit a response, wherein the signal processing circuit comprises a storage circuit, wherein the storage circuit includes a capacitor and a transistor having a channel comprising an oxide semiconductor, wherein one of electrodes of the capacitor is electrically connected to one of a source and a drain of the transistor via a holding node, and wherein the storage circuit is configured to store data after a signal potential corresponding to the data is input to the holding node, the transistor is turned off, and the holding node is set in a floating state. - View Dependent Claims (22, 23, 24, 25)
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26. A semiconductor device comprising:
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a power supply circuit configured to supply power supply voltage; and a signal processing circuit, wherein the semiconductor device is configured to receive a command and transmit a response, wherein the signal processing circuit comprises a flip-flop and a storage circuit configured to store data retained in the flip-flop, wherein the storage circuit includes a capacitor and a transistor having a channel comprising an oxide semiconductor, wherein one of electrodes of the capacitor is electrically connected to one of a source and a drain of the transistor via a holding node, and wherein the storage circuit is configured to store the data after a signal potential corresponding to the data is input to the holding node, the transistor is turned off, and the holding node is set in a floating state. - View Dependent Claims (27, 28, 29, 30)
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Specification