Communication method and communication system

摘要

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.

主权项

1. A communication method using a semiconductor device having a wireless function,
the communication method comprising the step of: restarting a command sequence from a middle of the command sequence when supply of a power supply voltage is temporarily stopped, wherein the command sequence comprises the step of:
holding data in a storage circuit, wherein the storage circuit includes a transistor and a capacitor whose one of a pair of electrodes is electrically connected to a holding node that is set in a floating state when the transistor is turned off, and wherein the storage circuit is electrically connected to a flip-flop so that a potential of a node in which the data in the flip-flop is retained is input to the holding node through the transistor.