Patent ID: 7929371

Claim:
A semiconductor device having a plurality of operation modes, comprising: a control terminal; a power supply terminal to which a power supply voltage is supplied; a first level detecting circuit for detecting a voltage level at said control terminal after a prescribed time period from when the power supply voltage is supplied to said power supply terminal; a control unit for selecting in which operation mode among said plurality of operation modes the semiconductor device operates, based on a result of detection by said first level detecting circuit; and a regulator for generating an internal power supply voltage based on the power supply voltage supplied to said power supply terminal, said first level detecting circuit and said control unit receiving said internal power supply voltage as an operating power supply voltage, and in an operation mode, among said plurality of operation modes, where a power supply voltage having a level different from that of a power supply voltage in other operation modes is supplied to said power supply terminal, said control unit performing data processing by using the power supply voltage supplied to said power supply terminal.