Information processing apparatus
First Claim
Patent Images
1. An information processing apparatus comprising:
- a first oscillating circuit for generating a first clock signal, the first oscillating circuit being capable of operating on a power supply voltage equal to or higher than a first lowest operating voltage;
a second oscillating circuit for generating a second clock signal, the second oscillating circuit being capable of operating on the power supply voltage equal to or higher than a second lowest operating voltage that is higher than the first lowest operating voltage;
a switching circuit that, based on the power supply voltage, selects either the first clock signal or the second clock signal to output as a clock signal; and
an information processing unit, in synchronism with the clock signal, for performing information processing.
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Accused Products
Abstract
By using a CR oscillating circuit and a PLL oscillating circuit selectively, these two oscillating circuits are used as a high frequency, low power consumption, short waiting time for stable oscillation, and low operating voltage oscillating circuit.
29 Citations
26 Claims
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1. An information processing apparatus comprising:
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a first oscillating circuit for generating a first clock signal, the first oscillating circuit being capable of operating on a power supply voltage equal to or higher than a first lowest operating voltage;
a second oscillating circuit for generating a second clock signal, the second oscillating circuit being capable of operating on the power supply voltage equal to or higher than a second lowest operating voltage that is higher than the first lowest operating voltage;
a switching circuit that, based on the power supply voltage, selects either the first clock signal or the second clock signal to output as a clock signal; and
an information processing unit, in synchronism with the clock signal, for performing information processing. - View Dependent Claims (2, 3, 6, 7, 10, 11, 12, 13, 14, 15, 16)
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4. An information processing apparatus comprising:
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a first oscillating circuit that generates a first clock signal by oscillation and has a first oscillation stability time, the first oscillation stability time being a time required for frequency of the first clock signal becoming stable from beginning of the oscillation;
a second oscillating circuit that generates a second clock signal by oscillation and has a second oscillation stability time, the second oscillation stability time being a time required for frequency of the second clock signal becoming stable from beginning of the oscillation, and being longer than the first oscillation stability time;
a switching circuit for, based on an elapsed time of the first oscillating circuit from the beginning of the oscillation and an elapsed time of the second oscillating circuit from the beginning of the oscillation, selecting and outputting either the first clock signal or the second clock signal as the clock signal; and
an information processing unit for, in synchronism with the clock signal, performing information processing. - View Dependent Claims (5, 8, 9)
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17. In a control method for an information processing apparatus, the information processing apparatus comprising:
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an information processing unit for, based on a clock signal, carrying out various information processing operations;
a first oscillating circuit that generates a first clock signal and is able to operate on power supply voltage equal to or higher than a first lowest operating voltage, a second oscillating circuit that generates a second clock signal and is able to operate on the power supply voltage equal to or higher than a second lowest operating voltage that is higher than the first lowest operating voltage;
a switching circuit for, based on the power supply voltage, outputting either the first clock signal or the second clock signal as the clock signal;
the control method comprising;
determining power supply voltage;
outputting by the switching circuit the first clock signal as the clock signal when the power supply voltage is equal to or higher than the first lowest operating voltage and lower than the second lowest operating voltage; and
outputting by the switching circuit the second clock signal as the clock signal when the power supply voltage is equal to or higher than the second lowest operating voltage. - View Dependent Claims (19, 20, 21)
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18. In a control method for an information processing apparatus, the information processing apparatus comprising:
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a first oscillating circuit that generates a first clock signal by oscillation and has a first oscillation stability time, the first oscillation stability time being a time required for frequency of the first clock signal becoming stable from beginning of the oscillation;
a second oscillating circuit that generates a second clock signal by oscillation and has a second oscillation stability time, the second oscillation stability time being a time required for frequency of the second clock signal becoming stable from beginning of the oscillation, and being longer than the first oscillation stability time;
a switching circuit for, based on an elapsed time from the beginning of the oscillation of the first oscillating circuit and on an elapsed time from the beginning of the oscillation of the second oscillating circuit, selecting to output either the first clock signal or the second clock signal as a clock signal;
an information processing unit for, in synchronous with the clock signal, carrying out information processing operations;
the control method comprising;
outputting the first clock signal as the clock signal after the first oscillation stability time has passed until the second oscillation stability time comes, and the second clock signal as the clock signal after the second oscillation stability time has passed.
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22. A control program executed by an information processing apparatus, the information processing apparatus comprising:
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an information processing unit for, based on a clock signal, carrying out various information processing operations;
a first oscillating circuit that generates a first clock signal and is able to operate on power supply voltage equal to or higher than a first lowest operating voltage, a second oscillating circuit that generates a second clock signal and is able to operate on the power supply voltage equal to or higher than a second lowest operating voltage that is higher than the first lowest operating voltage; and
a switching circuit for, based on the power supply voltage, outputting either the first clock signal or the second clock signal as the clock signal;
the control program comprising the routines of;
determining the power supply voltage;
outputting to the switching circuit the first clock signal as the clock signal when the power supply voltage is equal to or higher than the first lowest operating voltage and is lower than the second lowest operating voltage; and
outputting to the switching circuit the second clock signal as the clock signal when the power supply voltage is equal to or higher than the second lowest operating voltage. - View Dependent Claims (24, 25, 26)
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23. A control program executed by an information processing apparatus, the information processing apparatus comprising:
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an information processing unit for, in synchronous with a clock signal, carrying out various information processing operations;
a first oscillating circuit that generates a first clock signal by oscillation and has a first oscillation stability time, the first oscillation stability time being a time required for frequency of the first clock signal becoming stable from beginning of the oscillation;
a second oscillating circuit that generates a second clock signal by oscillation and has a second oscillation stability time, the second oscillation stability time being a time required for frequency of the second clock signal becoming stable from beginning of the oscillation, and being longer than the first oscillation stability time;
a switching circuit for, based on an elapsed time from the beginning of the oscillation of the first oscillating circuit and on an elapsed time from the beginning of the oscillation of the second oscillating circuit, selecting to output either the first clock signal or the second clock signal as a clock signal;
the control program comprising the routines of;
outputting the first clock signal as the clock signal after the first oscillation stability time has passed until the second oscillation stability time comes, and the second clock signal as the clock signal after the second oscillation stability time has passed.
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Specification