KR940002818Y1 - Protector for key-scanning code - Google Patents

Abstract

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Description

Key scan code protection by hot key

1 is a circuit diagram for conventional hotkey processing.

2 is another circuit diagram for conventional hotkey processing.

3 is a circuit diagram of a device for protecting a key scan code by a hotkey according to an embodiment of the present invention.

4 is a circuit diagram of a device for protecting a key scan code by a hotkey according to another embodiment of the present invention.

The present invention relates to a device for protecting a key scan code by a hot key, and in particular, a central processing unit (CPT) after storing the key scan code by a hot key in a latch. It relates to a device for protecting a key scan code by means of a hot key which allows the above-mentioned key scan code to be accessed.

The term hotkey, used in the field of information processing, generally refers to a specific key that is used when you stop using a program and then use another program to return to the original program.

In a conventional information processing device supporting the hotkey, two methods are generally used as a method of processing a hotkey.

1 is a circuit diagram for conventional hotkey processing. As shown in FIG. 1, the conventional circuit configuration for hotkey processing consists of a keyboard 11 and a keyboard controller 12 connected to the keyboard 11.

The operation of the circuit for conventional hotkey processing by the above configuration is as follows.

When the hotkey is pressed, a key scan code by the hotkey is input from the keyboard 11 to the keyboard controller 12. The central processing unit uses the timer interrupt request signal (IRQO), which appears 18.2 times per second of the timer, checks whether a key scan code has been entered by the hotkey, and processes the hotkey if a key scan code by the hotkey has been entered. do.

However, the conventional method described above has a disadvantage in that strange characters are displayed on the screen by a software that directly fetches interrupts, such as MS-WORD (Document Software for Micro Soft Company). The timer also has a routine that handles hotkeys, but the keyboard interrupt request signal also occurs when a hotkey comes in.

2 is another circuit diagram for conventional hotkey processing. As shown in FIG. 2, another circuit configuration for the conventional hotkey processing is composed of a keyboard 21 and a keyboard controller 22 connected to the keyboard 21. As shown in FIG.

The operation of the circuit other than the conventional hotkey processing according to the above configuration is as follows. When the hot key is pressed, a key scan code by the hot key is input from the keyboard 21 to the keyboard controller 22. When the key scan code by the hot key is input, the keyboard controller 22 processes the hot key by using the reserved interrupt request signal IRQ1 without generating the interrupt request signal IRQ1.

However, the above-mentioned conventional hotkey processing method uses a keyboard controller (or a keyboard controller) in a suspended interrupt processing routine in case of software that directly manages input / output, such as MS-WINDOW (Micro Soft's Graphical User Interface Software) even if the interrupt request signal is used. There is a disadvantage that a problem occurs when accessing port 60 of 22).

Therefore, the object of the present invention is to solve the above-mentioned disadvantages, and the key scan code by the hotkey is stored in the latch and then accessed by the central processing unit so that the hotkey is supported by the hotkey in any software. It is to provide the protection of.

In order to achieve the above object, the present invention has a keyboard that outputs a key scan code by a hot key when a hot key is pressed, and a key scan code through an input / output port when a key scan code by a hot key is connected to the keyboard. And a keyboard controller for outputting an interrupt request signal, a latch connected to the keyboard controller to store a key scan code, and a buffer that passes through the key scan code stored in the latch when a specific input / output address is connected to the latch and specifies a specific input / output address. And a first OR gate for clearing the latch by inputting the specific I / O address signal and the IOW signal, and a second OR gate for enabling the buffer by inputting the specific I / O address signal and the IOR signal. .

According to another exemplary embodiment of the present invention for achieving the above object, a keyboard controller outputs a kisscan code and a pending interrupt request signal through an input / output port when a key scan code is input by a hotkey when a hotkey is pressed. A latch connected to the keyboard controller to store a key scan code, a buffer connected to the latch to pass a key scan code stored in the latch, and a specific input / output address signal and an IOW signal. A third orifice for clearing the latch as an input, a fourth ore gate for enabling a buffer by inputting a specific input / output address signal and an IOR signal, and receiving a pending interrupt request signal connected to the keyboard controller. It consists of an interrupt controller.

Preferred embodiments of this invention by the above-described configuration will be described in detail with reference to the drawings.

3 is a detailed circuit diagram of a device for protecting a key scan code by a hotkey according to an embodiment of the present invention. As shown in FIG. 3, the configuration of the key scan code protection device by the hot key according to the embodiment of the present invention is composed of the clock 31 and the clock signal terminal and the data signal terminal of the keyboard 31 and the data signal terminal. A keyboard controller 32 having a signal terminal connected thereto, a latch 33 having an enable terminal CP connected to a terminal of the keyboard controller 32 connected to an input terminal of the keyboard controller 32, and a latch 33 A first OR gate G1 and a buffer 34 having an output terminal connected to the connected buffer 34, an enable terminal G of the latch 33, and respective input terminals connected to the 26D input / output address signal line and the input / output write signal line. A second OR gate G2 is connected to an output terminal connected to an enable terminal of the N-th output terminal, and an input terminal is connected to a 26D input / output address signal line and an input / output read signal line.

The operation of the protection apparatus of the key scan code by the hotkey according to the embodiment of the present invention by the above configuration is as follows.

When a hot key is pressed on the keyboard 31, a key scan code corresponding to the hot key is input from the keyboard 31 to the keyboard controller 32. The keyboard controller 32 outputs the input key scan code through the first input / output ports P10 to P13 and simultaneously outputs a request signal for the interrupt request signal in a high state through the second input / output port P22. . The output signal of the second input / output port P22 of the keyboard controller 32 is input to the enable terminal CP of the latch 33 so that the key scan code is stored in the latch 33. The key scan codes stored in the latch 33 are loaded on the bus through the buffer 34 by a specific input / output address signal and an input output read (IOR) signal, respectively, which are in a low state. In addition, the key scan code stored in the latch 33 is cleared by a specific address signal in a low state and an input output write (LOW) signal, respectively. Therefore, the central processing unit can access the key scan code in the hotkey by designating a specific input / output address whenever an interrupt by a timer is required. The embodiment of the present invention uses 26D as a specific input / output address, but the technical idea of the present invention is not limited thereto.

4 is a detailed circuit diagram of a device for protecting a key scan code by a hotkey according to another embodiment of the present invention. As shown in FIG. 4, the configuration of a key scan code protection device by means of a hot key according to another embodiment of the present invention includes a clock signal terminal and a clock signal terminal and a data signal terminal of the keyboard 41 and the keyboard 41. A keyboard controller 42 having a data signal terminal connected thereto, a latch 43 having an input terminal connected to the keyboard controller 42, and an enable terminal CP connected to a terminal of the keyboard controller 42, and a latch 43. A third OR gate 63 connected to a buffer 44 connected to the output terminal, an output terminal connected to an enable terminal of the latch 43, and respective input terminals connected to a 26D input / output address signal line and an input / output write signal line; An output terminal is connected to the enable terminal G, and a fourth OR gate G4 having respective input terminals connected to the 26D input / output address signal line and the input / output read signal line, and an interrupt controller 45 connected to the keyboard controller 42.

The operation of the key scan code protection device by the hot key according to another embodiment of the present invention by the above configuration is as follows.

When a hot key is pressed on the keyboard 41, a key scan code corresponding to the hot key is input from the keyboard 41 to the keyboard controller 42. The keyboard controller 42 outputs the input key scan code through the first input / output ports P10 to P13 and outputs an interrupt request signal in a high state through the second input / output port P22.

The output signal of the second input / output port P22 of the keyboard controller 32 is input to the enable terminal CP of the latch 43, so that the key scan code is stored in the latch 43 and the interrupt controller 45 Outputs a reserved IRQ. The key scan code stored in the latch 43 is loaded on the bus through the buffer 34 by the specific input / output address signal and the IOR signal which are in the low state, respectively. In addition, the key scan code stored in the latch 33 may be cleared by the specific address signal and the IOW signal in the low state, respectively. Therefore, the CPU can access the kisscan code by the hotkey by designating a specific input / output address when the interrupt request signal is held.

As described above, in the embodiment of the present invention, the key scan code by the hot key is stored in the latch and then accessed by the central processing unit, so that any device for protecting the key scan code by the hot key having the effect of supporting the hot key in any software is provided. I can provide it. This effect of the invention can be used in the field of information processing equipment using hotkeys.

Claims (2)

An information processing apparatus using a hotkey, comprising: a keyboard 31 for outputting a key scan code by a hotkey when the hotkey is pressed; A keyboard controller 32 connected to the keyboard 31 and outputting a kisscan code and an interrupt request signal through an input / output port when a key scan code by a hot key is input; A latch 33 connected to the keyboard controller 32 to store a key scan code; A buffer 34 connected to the latch 33 to pass a key scan code stored in the latch 33 when designating a specific input / output address; A first OR gate G1 for clearing the latch 33 by inputting a specific input / output address signal and an IOW signal; And a second orifice (G2) for enabling a buffer (34) by inputting a specific input / output address signal and an IOR signal. An information processing apparatus using a hot key, comprising: a keyboard 41 for outputting a key scan code by a hot key when the hot key is pressed; A keyboard controller 42 connected to the keyboard 41 and outputting a key scan code and a pending interrupt request signal through an input / output port when a key scan code by a hot key is input; A latch 43 connected to the keyboard controller 42 to store a key scan code; A buffer 44 connected to the latch 43 to pass a key scan code stored in the latch 43 when designating a specific input / output address; A third OR gate G3 for clearing the latch 43 by inputting a specific input / output address signal and an IOW signal; A fourth OR gate G4 for enabling the buffer 44 by inputting a specific input / output address signal and an IOR signal; And an interrupt controller (45) connected to the keyboard controller (45) to receive a pending interrupt request signal.