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 Information processing system with a power control unit

Details
Inventors: Joto, Takuma;
Assignee: Sharp Kabushiki Kaisha (Osaka, JP)
Primary Examiner: Envall, Jr.; Roy N.
Assistant Examiner: Moise; Emmanuel L.
Attorney, Agent or Firm: Conlin; David G., Pahl, Jr.; Henry D.

An information processing system for processing an application program provides a power control unit being operated at a run mode at which the system is powered and a standby mode at which part of the system is powered. The system further includes functions of inputting any key on a keyboard into an application program, transferring the run mode to the standby mode by pressing a special key on the keyboard, transferring the standby mode to the run mode by pressing any key on the keyboard, detecting no key input takes place for a certain interval of time; and transferring to the standby mode if the detecting means does not detect any occurence of key input for a constant time at the run mode. The system further has function of detecting one key is continuously pressed for a predetermined interval of time and transferring to said standby mode upon detection of one key continuous input.

DETAILED DESCRIPTION It is an object of the present invention to provide a power control unit provided in an information processing system which is capable of preventing unintentional consumption of power when it is not used.
In carrying out, an information processing system for processing an application program, providing a power control unit being operated at a run mode at which the system is powered and a standby mode at which part of the system is powered, includes: means for inputting any key on a keyboard into an application program; means for transferring the run mode to the standby mode by pressing a special key on the keyboard; means for transferring the standby mode to the run mode by pressing any key on the keyboard; means for detecting no key input takes place for a certain interval of time; and means for transferring to the standby mode if the detecting means does not detect occurrence of key input for a constant time at the run mode.
A key input occurring if something is placed on the keyboard or if something comes into contact with the keyboard when the small-sized system is in a bag has a feature of continuous press of the same key for a certain interval of time.
Focusing on this feature, there is provided means for monitoring continuous occurrence of one key input for a certain time.
The monitoring means operates to determine that the continuous occurrence of one key input is unintentional and transfer the system mode to a suitable mode for preventing waste of power.
The one key input monitor section is provided in the power control unit for that purpose.
The section operates to detect the continuous occurrence of one key input for a certain time.
If one key input is continuously given for a certain time at the run mode, the monitor means operates to transfer the run mode to the standby mode.
If the same thing occurs at the standby mode, the mode is not transferred to the run mode.
The transfer condition of the standby mode to the run mode is restrictively changed from any key input to a special key input



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