Portable remote terminal in which its clock frequency is switched
First Claim
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1. A portable terminal in which its clock frequency is switched, comprising:
- a main controlling portion having a software processing portion using a microprocessor in said main controlling portion according to an interruption, said microprocessor including an operating system for driving software in said software processing portion and generating an interrupt signal,a clock supply portion for supplying to said main controlling portion a clock signal which causes said microprocessor to operate, anda state monitoring portion for monitoring, via the interrupt signal received from the operating system, an operating state of said software processing portion, whereinsaid state monitoring portion sends a clock switching signal to said clock supply portion so that said clock supply portion sets a frequency of said clock signal to a high frequency when said software processing is being conducted and sets a frequency of said clock signal to a low frequency when said processing is not being conducted andwhen no processing is conducted by said microprocessor for said software processing portion, the clock supply portion sets the clock frequency to a minimum, said minimum being below the operating frequency of the software processing portion but high enough for said state monitoring portion to operate.
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Abstract
A portable terminal comprising a state monitoring portion for monitoring an operating state of a microprocessor in a main control portion, and for increasing a clock frequency when the microprocessor conducts software processing in the main control portion, and for decreasing a clock frequency to supply the minimum operating clock for the microprocessor enough to operate when the microprocessor does not conducts the software processing. The present invention can save the power of the portable terminal effectively.
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Citations
11 Claims
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1. A portable terminal in which its clock frequency is switched, comprising:
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a main controlling portion having a software processing portion using a microprocessor in said main controlling portion according to an interruption, said microprocessor including an operating system for driving software in said software processing portion and generating an interrupt signal, a clock supply portion for supplying to said main controlling portion a clock signal which causes said microprocessor to operate, and a state monitoring portion for monitoring, via the interrupt signal received from the operating system, an operating state of said software processing portion, wherein said state monitoring portion sends a clock switching signal to said clock supply portion so that said clock supply portion sets a frequency of said clock signal to a high frequency when said software processing is being conducted and sets a frequency of said clock signal to a low frequency when said processing is not being conducted and when no processing is conducted by said microprocessor for said software processing portion, the clock supply portion sets the clock frequency to a minimum, said minimum being below the operating frequency of the software processing portion but high enough for said state monitoring portion to operate. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A portable terminal in which its clock frequency is switched, comprising:
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a main controlling portion having a software processing portion using a microprocessor in said main controlling portion according to an interruption, said microprocessor including an operating system for driving software in said software processing portion and generating an interrupt signal, a clock supply portion for supplying to said main controlling portion a clock signal which causes said microprocessor to operate, and a state monitoring portion for monitoring, via the interrupt signal received from the operating system, whether the microprocessor accesses an external memory, wherein said state monitoring portion sends a clock switching signal to said clock supply portion so that said clock supply portion sets a frequency of said clock signal to a high frequency when the microprocessor accesses an external memory and sets a frequency of said clock signal to a low frequency when said microprocessor does not access the external memory and when no memory accesses or software processing is conducted by said microprocessor for said software processing portion, the clock supply portion sets the clock frequency to a minimum, said minimum being below the operating frequency of the software processing portion but high enough for said state monitoring portion to operate. - View Dependent Claims (8)
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9. A power saving portable telephone having a communication state and a non-communication state comprising:
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a main controlling portion having a software processing portion using a microprocessor in said main controlling portion according to an interruption, said microprocessor including an operating system for driving software in said software processing portion and generating an interrupt signal; a clock supply portion for supplying to said main controlling portion a clock signal which causes said microprocessor to operate wherein said clock signal frequency is adjustable; and a state monitoring portion for monitoring, via the interrupt signal received from the operating system, an operating state of said software processing portion, said state monitoring portion sends a clock switching signal to said clock supply portion so that said clock supply portion sets a frequency of said clock signal to high when said software processing is being conducted and sets a frequency of said clock signal to minimum when said processing is not being conducted, wherein the setting of said clock frequency to high or minimum is independent of whether the telephone is in the communication state or non-communication state. - View Dependent Claims (10, 11)
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Specification