Patent ID: 8403231

Claim:
A semiconductor device comprising: a power supply generation circuit configured to generate a direct current voltage from an alternating voltage which is generated from a radio wave; a demodulation circuit configured to extract data from the alternating voltage; a memory; a boosting circuit configured to boost up the direct current voltage and to supply the boosted direct current voltage to the memory; and a boosting control portion comprising: a command completion identification circuit configured to generate a first information for starting the boosting in accordance with a command completion signal of the data; a boosting time control circuit configured to generate a second information for controlling a time to supply the boosted direct current voltage to the memory in accordance with a writing signal of the data; and a boosting possibility identification circuit configured to control the boosting circuit in accordance with the first information and the second information, so that the direct current voltage is boosted up after detecting the command completion signal of the data.