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EP0474963A2
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EP
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Computer system having sleep mode function
Assignee: Toshiba Corp
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Filing: 1991-04-18
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Granted: —
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Expires: 2011-04-18
Abstract
Abstract A personal computer having a sleep mode function for reducing power consumption by lowering the frequency of a clock pulse to be supplied to a CPU includes a clock control circuit (18) for generating a high-frequency first clock pulse, and a low-frequency second clock pulse. When a power supply is turned on, an initial program loader (IPL) discriminates whether or not an AC adapter (105) is connected. The computer also includes a sleep mode controller (16) for, when the AC adapter is connected, disabling a signal, to be supplied to the clock control circuit, for instructing generation of the second clock pulse.
Inventors
- 👤 Kazunori C/O Intellectual Property Div. Yamaki
- 👤 Hirofumi c/o Intellectual Property Div Nishikawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 20:58
CPC Classifications
G; G06; G06F; G06F1/00; G06F1/26; G06F1/32; G06F1/3203; G06F1/3234; G06F1/324; Y; Y02; Y02D; Y02D10/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
127 words
A computer system having a sleep mode function, characterized by comprising: processor means (10) for performing various data processing operations; clock control means (18) for selecting one of a first clock pulse at a predetermined high frequency required in a normal mode of said processor means, and a second clock pulse at a predetermined low frequency required in a sleep mode of said processor means, and supplying the selected clock pulse to said processor means; discrimination means (14) for discriminating whether or not said computer system receives an external power supply; and sleep operation control means (16) for, when said discrimination means discriminates that said computer system receives an external power supply, prohibiting said clock control means to supply the second clock pulse to said processor means.
Claim 2
Dependent Claim
37 words
A system according to claim 1, characterized in that said discrimination means includes means for discriminating whether or not an AC adapter is connected to said system to check whether or not a power is externally supplied.
Claim 3
Dependent Claim
45 words
A system according to claim 1, characterized in that said discrimination means includes means for discriminating whether or not said computer system receives a power supply from an expansion unit for expanding a function of said computer system which is releasably connected to said system.
Claim 4
Dependent Claim
39 words
A system according to claim 1, characterized in that said discrimination means includes initial program loader means for, when a power is supplied to said computer system, discriminating whether or not said computer system receives an external power supply.
Claim 5
Dependent Claim
30 words
A system according to claim 1, characterized in that said sleep operation control means comprises memory means for storing mode control data indicating that the sleep mode operation is prohibited.
Claim 6
Dependent Claim
15 words
A system according to claim 5, characterized in that said memory means comprises a register.
Claim 7
Dependent Claim
19 words
A system according to claim 5, characterized in that said memory means comprises a battery-backup random access memory (RAM).
Claim 8
Dependent Claim
134 words
A computer system including a main body having a battery and an external terminal for receiving an external power source, comprising: a central processing unit (CPU) (10) performing data processing operations; a clock control circuit (18) selecting one of a high clock pulse for operating said CPU at a high speed and a low clock pulse for operating said CPU at a low speed, the clock control circuit supplying the selected clock pulse to said CPU; determination means (14) for determinating whether or not the main body receives the external power source through the external terminal; and a sleep mode controller (16) instructing said clock control circuit to supply the high clock pulse to said CPU when said determination means determinates that the main body receives the external power source through the external terminal.
References Cited (Backward Citations)
No citation records indexed.
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