JPH10124219A - Keyboard - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a keyboard which automatically generates code data. SOLUTION: The pulse of a prescribed period is generated from a timer 12 and the interval of the key input of a key matrix 11 is previously set. In a selection means 15, a binary which shows a low level at ON-time and a high level at OFF-time is set and it is inputted to an interruption means 13. The interruption means 13 decides whether an interruption signal 13A from the timer 12 is to be sent to CPU 14 or not in accordance with the low level/high level from the selection means 15. Then, CPU 14 sends an output signal 14A where a shift key and a control key except for code data 11A which is key- inputted and which has an inconvenience are set to be code data 11A from the keyboard 1 whenever the interruption signal 13A is inputted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard as an input device of an information processing apparatus, and more particularly to a keyboard provided with a means for automatically generating code data.

[0002]

2. Description of the Related Art In a conventional keyboard, as shown in FIG. 2, when a key of a key matrix 11 is depressed, code data 11A is sent from the key matrix 11, and the CPU 104 recognizes the code data 11A and recognizes the host system. When the CPU 104 recognizes that the circuit of the key matrix 11 of the keyboard 101 has been released by releasing the key and releasing the key, the output signal 104A from the keyboard 101 transmitted to the host system 2 stops. I do.

When a key is continuously depressed, the code data 11A from the key matrix 11 is sent to the CPU 10.
4 recognizes the output signal 104A from the keyboard 101
Is output to the host system 2 continuously, the keyboard 101 outputs the code data 11A for the first time depending on whether a key is pressed or released.

[0004]

As described above, in the conventional keyboard, when a key is depressed, the code data 1
To output 1A, if the screen saver is activated on the host system 2 side, if there is no input from the keyboard 101 for more than the set time of the screen saver, the screen will automatically disappear or switch to another screen. .

[0005] For this reason, when the time set for the screen saver is set to a short time, for example, 3 minutes or 5 minutes, and the user is thinking about text while looking at the screen during document creation,
There was a problem that the screen saver started immediately and the screen was interrupted.

Accordingly, an object of the present invention is to provide a keyboard which prevents the operation of a screen saver during data processing by automatically outputting code data without changing settings on the host system side and without pressing a key. It is to be.

[0007]

In order to solve the above-mentioned problems, a keyboard according to the present invention comprises a key matrix in which keys for inputting code data to a host system are arranged in a matrix, and a key input of the key matrix. A timer having an interval set in advance for a predetermined period, interrupting means for transmitting an interrupt signal in a predetermined period set by the timer, and selecting means for selecting whether to transmit an interrupt signal from the interrupting means, And a CPU for transmitting the code data to the host system during the predetermined period only when transmission of the interrupt signal is selected by the selection means.

[0008]

Next, a keyboard according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a keyboard according to an embodiment of the present invention.

As shown in FIG. 1, a keyboard according to an embodiment of the present invention has a key matrix 11 in which keys for inputting code data 14A to the host system 2 are arranged in a matrix, and a key input of the key matrix 11. A timer 12 having an interval set in advance for a predetermined period, an interrupting means 13 for transmitting an interrupt signal 13A in a predetermined period set by the timer 12, and an interrupting means 13
Selecting means 15 for selecting whether or not to send an interrupt signal 13A from the CPU, and a CPU 14 for sending code data 14A to the host system 2 for a predetermined period only when the selecting means 15 selects sending of the interrupt signal 13A. It consists of.

Next, the operation of the keyboard according to one embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the operation of the keyboard according to the embodiment of the present invention is as follows. A pulse of a predetermined period is generated from a timer 12 to set a key input interval of the key matrix 11 in advance. Is, for example, O
Two values such as a low level at N and a high level at OFF are set and input to the interrupt unit 13. The interrupt unit 13 sends an interrupt signal 13 A from the timer 12 to the CPU 14 according to the low level / high level from the selection unit 15.
Decide whether to send to or not.

Thereafter, the CPU 14 outputs the interrupt signal 13A.
Every time is input, an output signal 14A is transmitted from the keyboard 1 to the host system 2 using the shift key and the control key, etc., as the code data 11A, except for the code data 11A of the alphabet and the numeral, which are entered by a key.

[0014]

As described above, according to the keyboard of the present invention, when the selection means is in the interrupt enabled state,
By outputting specific code data at predetermined intervals, there is an effect of preventing the host system from automatically activating the screen saver.

[Brief description of the drawings]

FIG. 1 is a block diagram of a keyboard according to an embodiment of the present invention.

FIG. 2 is a block diagram of a conventional keyboard.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Keyboard 2 Host system 11 Key matrix 12 Timer 13 Interruption means 14 CPU 15 Selection means 11A Code data 13A Interrupt signal 14A CPU (output signal)

Claims (1)

[Claims] 1. A key matrix in which keys for inputting code data to a host system are arranged in a matrix, a key input interval of the key matrix is set in advance for a predetermined period, and a timer is set for a predetermined period set by the timer. Interrupting means for transmitting an interrupt signal; selecting means for selecting whether or not to transmit an interrupt signal from the interrupting means; and A keyboard comprising: a CPU for transmitting the code data to a host system.