| 摘要 |
A semiconductor integrated circuit device operates using a first power supply and a second power supply differing from the first power supply in voltage. The semiconductor integrated circuit device includes a first detecting circuit which detects that the first power supply has exceeded a specific voltage, a second detecting circuit which detects that the second power supply has exceeded a specific voltage, and a check circuit which checks the operating state of an analog circuit carrying out an analog operation using the first power supply and outputs a control signal indicating whether the analog circuit is operating properly. The detecting level of the first detecting circuit is determined on the basis of the control signal. A power-on reset signal is output according to the result of the detection at the first and second detecting circuits.
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