Semicondustor device

A semiconductor device comprising:

• an external power supply line to which external power is supplied;
• first and second power supply lines;
• a first regulator circuit driven by the external power supply line and outputting internal power to the first power supply line;
• a second regulator circuit driven by the external power supply line and outputting internal power to the second power supply line;
• a unit for interrupting and resuming outputting of the internal power to the second power supply line;
• a first circuit to which power is supplied via the second power supply line and, when outputting of the internal power to the second power supply line is interrupted, which enters an operation stop state;
• and
• a voltage determining circuit for determining voltage level of the second power supply line,
• wherein, when outputting of the internal power to the second power supply line is resumed, the first circuit in the operation stop state shifts to an operation state on the basis of a determination result of the voltage determining circuit.

A semiconductor device comprising:

• an external power supply line to which external power is supplied;
• a first power supply line in which power supply is not interrupted;
• a plurality of second power supply lines to each of which power supply can be selectively interrupted or resumed;
• a plurality of power switches for connecting the first power supply line and the plurality of second power supply lines to each other;
• and
• a voltage determining circuit for determining voltage level of each of the plurality of second power supply lines,
• wherein power is supplied to the first power supply line by a first regulator circuit driven by the external power supply line,
• wherein power is supplied to each of the plurality of second power supply lines from second regulator circuits provided for the plurality of second power supply lines and driven by the external power supply line,
• wherein a state of each output of the second regulator circuit is set and a desired power switch in the plurality of power switches is turned off, thereby selecting a power supply line in which power supply is interrupted from the plurality of second power supply lines, and
• wherein, at the time of resuming the power line in which power supply is interrupted, the desired power switch is turned on by using a determination result of the voltage determining circuit as a trigger.

A semiconductor device comprising:

• an external power supply line to which external power is supplied;
• first and second regulator circuits connected to the external power supply line and capable of generating internal power;
• a first internal power supply line to which an output of the first regulator circuit is connected;
• a second internal power supply line to which an output of the second regulator circuit is connected;
• and
• a power switch for connecting the first and second internal power supply lines,
• wherein a voltage detection circuit is further provided, which can detect level of a voltage supplied to the second internal power supply line when the power switch is in an off state and the first and second internal power supply lines are controlled not to be connected.