Real time clock architecture and/or method for a system on a chip (SOC) application
First Claim
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1. An apparatus comprising:
- a first portion configured to generate a count signal in response to a clock signal, wherein said first portion is powered by an unswitched power source;
a second portion configured to generate an interrupt signal in response to said count signal and a predetermined stored value, wherein said second portion is powered by a switched power source; and
a processor configured to receive said interrupt signal and said count signal, wherein said processor is powered by said switched power source, and wherein said first portion is further configured to automatically switch between (i) being powered by said unswitched power source when said switch power source is off and (ii) being powered by said switched power source when said switched power source is on.
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Abstract
An apparatus comprising a first portion, a second portion and a processor. The first portion is configured to generate a count signal in response to a number of oscillations of a clock signal. The first portion is powered by an unswitched power source. The second portion is configured to generate an interrupt signal in response to the count signal and a predetermined stored value. The second portion is powered by a switched power source. The processor is configured to (i) receive the interrupt signal and (ii) generate the switched power.
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Citations
19 Claims
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1. An apparatus comprising:
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a first portion configured to generate a count signal in response to a clock signal, wherein said first portion is powered by an unswitched power source; a second portion configured to generate an interrupt signal in response to said count signal and a predetermined stored value, wherein said second portion is powered by a switched power source; and a processor configured to receive said interrupt signal and said count signal, wherein said processor is powered by said switched power source, and wherein said first portion is further configured to automatically switch between (i) being powered by said unswitched power source when said switch power source is off and (ii) being powered by said switched power source when said switched power source is on. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 17, 18, 19)
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14. An apparatus comprising:
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means for generating a count signal, wherein said count signal is generated in response to a clock signal and said means for generating said count signal is powered by an unswitched power source; means for generating an interrupt signal, wherein said interrupt signal is generated in response to said count signal and a predetermined stored value and said means for generating said interrupt signal is powered by a switched power source; and means for (i) receiving said interrupt signal and said count signal and (ii) performing a predetermined function, wherein said receiving and performing means is powered by said switched power source, and wherein said count generating means is further configured to automatically switch between (i) being powered by said unswitched power source when said switched power source is off and (ii) being powered by said switched power source when said switched power source is on.
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15. A method for generating a clock signal comprising the steps of:
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(A) generating a count signal in response to a clock signal, wherein said count signal and said clock signal are generated using a first circuit powered by an unswitched power source; (B) generating an interrupt signal in response to said count signal and a predetermined stored value, wherein said interrupt signal is generated using a second circuit powered by a switched power source; and (C) presenting said interrupt signal and said count signal to a processor powered by said switched power source, wherein said first circuit is further configured to automatically switch between (ii) being powered by said unswitched power source when said switched power source is off and (ii) being powered by said switched power source when said switched power source is on. - View Dependent Claims (16)
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Specification