JPH0357007A - Information processor - Google Patents

Abstract

PURPOSE:To reduce the power consumption by providing a clock frequency selecting means which selects a clock frequency in accordance with the signal of a clock frequency control means. CONSTITUTION:A device consists of an operation state detecting means 10 which detects the operation state, a clock control means 11 which outputs the signal to select a clock frequency corresponding to the operation state, and a frequency selecting means 12 which selects the frequency by this signal. An output 13 of the clock frequency selecting means 12 is the clock signal to a CPU. Consequently, the clock frequency is switched by detecting that a display part is opened/closed or the device is not used for a long time. Thus, the program load time after interruption of the use is omitted, and the time when the device can be operated by a battery as a weak point of a portable computer is extended because the power consumption for interrupted use is reduced, and the life of a display body is extended.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to an information processing device that selects a clock frequency by detecting an inactive state of the device.

``Conventional technology'' When a conventional electronic computer interrupts work, it consumes the same amount of power as when it is in operation, unless the power is turned off. However, when the power is turned off, the running program is erased, so in order to run the program again, it is necessary to read the program from a recording medium such as a floppy disk. Therefore, if the work is interrupted for a short time, it takes time to load the subsequent program and consumes power to drive the floppy disk drive.

"Problem to be Solved by the Invention" However, in the case of electronic computers with display parts that open and close, wasteful power consumption is a problem because it is expected that they will be mainly used in places where there is no power source. be.

The present invention is intended to solve these problems, and its purpose is to detect the usage status of the device and change the clock frequency to rationally operate the device.

"Means for Solving the Problems" The present invention includes a detection means for detecting an inoperative state of an apparatus, a clock frequency control means for controlling a clock signal by the detection of the detection means, and a clock frequency control means for controlling a clock signal by the signal of the clock frequency control means. The present invention is characterized by comprising at least clock frequency selection means for selecting the clock frequency. Embodiment j Below, as an embodiment of the present invention, an electronic computer in which the clock frequency is switched by opening and closing the display section will be explained based on the drawings. Fig. 1 shows the configuration of the present invention. Operating state for detecting the operating state It is composed of a detection means 10, a clock control means 1l which outputs a signal for selecting a clock frequency corresponding to the operating state, and a frequency selection means 12 which selects a frequency based on the signal.Output 13 from the clock frequency selection means 12. The CPU is turned on. Fig. 3 is a block diagram of the embodiment, in which the CPU 31 executes a program to check the status of the display unit from the R○M 32 by an interrupt from the switch 30, and checks the open/closed status of the display unit based on the clock frequency. When the state of the clock frequency control register 34 written in the control register 34 changes, the clock frequency control means 35, which constantly monitors the state of this register 34, changes the open/closed state of the display section from the on/off state of the bit of the clock frequency control register 34. If the display section is open, the clock control signal 302 is turned off, and if the display section is closed, the clock control signal 302 is turned on. Signal 302 and signal 405 in Figure 3 are the same as signal 304, and Figure 5 is a timing diagram of the circuit. In Figure 4, 401 is a clock signal;
Indicated by 0. Divide the signal 40 in half by a flip-flop 4003 to generate a signal 42.Nor 4004 of the signals 40 and 42 to generate a signal 43, and set the rising timing 1+ of the signal 44. The cycle is progressing. This is because the clock is selected by ANDing the signals 42 and 43, which have a frequency of 1/2 of the signal 40, with the signals 44.45 and 4007.4008, so the signal 44.45 is the clock. This is to prevent the clock frequency from changing in the middle of the clock cycle if it changes in the middle of the cycle. In the AND 4007, the signal 44 raised by the signal 43 and the signal 4 obtained by dividing the clock frequency 401 by 1/2
2 and 4008, similarly, signal 4 is
5 and a signal 40 equal to the clock frequency 401. In other words, depending on whether the clock control signal 41 is turned on or off, either the signal 44 or 45 is turned on and the signal 40 is turned on.
The AND of 07 and 4008 and the NOR of 4009 output the clock frequency 401 or a half thereof as the clock signal 46. Next, how the output signal 46 changes depending on whether the clock control signal 41 is turned on or off is shown in FIG. At 1+, the clock control signal 43 input to the
and 45 are inverted, and signal 44 becomes high level. Then, signal 42 is output. Also, at t2, the clock control signal 41
When becomes a low level (the display section is open), the signal 43 input to the flip-flop 4005 turns on.
At 3, signals 44 and 45 are inverted, and signal 45 becomes high level. Then, signal 40 becomes the output signal. In this way, you can control the clock frequency. Although the embodiment has been explained by opening and closing the display part, even if the display part does not move, if there is no key manual power for a certain period of time, the timer function can be activated and the clock signal can be changed after a certain period of time. The clock signal may be lowered and used when the voltage drops below a certain value. Regarding whether to raise or lower the clock signal, there are cases where fast processing is required when one person has no power, and there are cases where fast processing is not required as in the embodiment. The clock signal is changed depending on the usage status of the equipment to increase the usage efficiency of the equipment.

"Effects of the Invention" As explained above, according to the present invention, by detecting opening/closing of the display section or not using the device for a while and switching the clock frequency, it is possible to save program loading time after interruption of use. In addition, since power consumption during intermittent use can be reduced, the operating time of batteries, which is a weak point of portable computers, can be extended, and the life of the display body can be extended.

[Brief explanation of drawings]

Figure 3 is a block diagram of an embodiment of this invention, Figure 4 is a circuit diagram of a clock frequency selection circuit that selects a clock frequency, and Figure 5 is a timing diagram of the circuit.Frequency selection 10 11 12 Operating state detection means Clock frequency control means Clock frequency selection means 401 402 403 404 Clock signal Clock control signal Power on signal Reset signal or higher

Claims (1)

[Scope of Claims] Detection means for detecting an inoperative state of the device; Clock frequency control means for controlling a clock signal based on detection by the detection means; and a clock for selecting the clock frequency based on a signal from the clock frequency control means. An information processing device comprising at least frequency selection means.