Integrated circuit device

1. An integrated circuit device comprising:

a processor having an arithmetic circuit; and

a power management unit implementing power control of the processor and at least one logic circuit through a power supply section without performing an arithmetic operation, the power management unit comprising:

a memory storing a plurality of commands, and

a control section implementing power control of the processor and the at least one logic circuit according to the commands stored in the memory.

2. The integrated circuit device according to claim 1 , wherein the power management unit is placed in a constant power-on region where power is constantly supplied from the power supply section.

3. The integrated circuit device according to claim 1 , wherein the control section of the power management unit includes a sequencer circuit having a state machine and a decoder.

4. The integrated circuit device according to claim 1 ,

wherein the power management unit supplies power to the at least one logic circuit through the power supply section when supplying power to the processor through the power supply section.

5. The integrated circuit device according to claim 1 , further comprising:

a clock generation circuit supplying a clock to the processor,

wherein the power management unit controls the clock generation circuit so as to supply a predetermined clock to the processor when supplying power to the processor through the power supply section.

6. The integrated circuit device according to claim 1 , further comprising:

a plurality of power switches placed on branch lines that diverge from a line through which power is supplied constantly from the power supply section and are connected to each of the processor and the at least one logic circuit,

wherein the power management unit controls on and off of the power switches.

7. The integrated circuit device according to claim 6 , wherein the power management unit and the power switches are placed in a constant power-on region where power is constantly supplied from the power supply section.

8. The integrated circuit according to claim 1 , wherein the command stored in the memory instructs the power management unit to implement the power control of the processor and the at least one logic circuit in a predetermined way.

9. The integrated circuit according to claim 1 , wherein a plurality of power supply sections are provided, and the power supply section for the processor is different from the power supply section for the power management unit.

10. The integrated circuit according to claim 1 , wherein no arithmetic circuit is included in the power management unit.

11. The integrated circuit according to claim 1 , wherein a circuit size of the power management unit is smaller than a circuit size of the processor.

12. The integrated circuit according to claim 1 , wherein the power management unit performs the power control of the processor and the at least one logic circuit while no power is supplied to the processor from the power supply section.

13. The integrated circuit according to claim 1 , further comprising;

a clock generator that generates a clock supplied to the processor,

wherein the power management unit directs the clock generator to change its clock frequency.

14. An integrated circuit device, comprising:

a processor having an arithmetic circuit;

at least one logic circuit having a register; and

a power management unit implementing power control of the processor and the at least one logic circuit through a power supply section without performing an arithmetic operation, the power management unit comprising:

a memory storing a plurality of commands; and

a control section implementing power control of the processor and the at least one the logic circuit according to the commands stored in the memory,

wherein the power management unit performs writing of a predetermined value to the register of the at least one logic circuit when supplying power to the processor through the power supply section.

15. An integrated circuit device comprising:

a processor having an arithmetic circuit; and

a programmable sequencer implementing power control of the processor and at least one other circuit through a power supply section without performing an arithmetic operation,

wherein the programmable sequencer performs initialization of the at least one other circuit in the integrated circuit device in parallel with supplying power to the processor through the power supply section.

16. The integrated circuit device according to claim 15 , wherein the initialization comprises writing of an initial value to a register included in the at least one other circuit in the integrated circuit device.

17. The integrated circuit device according to claim 15 , wherein the programmable sequencer comprises:

a memory storing a plurality of commands, and

a control section implementing power control of the processor and the at least one logic circuit according to the commands stored in the memory.