JPH0332087B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a terminal device having a keyboard, such as a personal computer.

Conventional configuration and problems thereof FIG. 1 shows an example of the configuration of a conventional personal computer.

In Figure 1, 1 is the central processing unit (CPU),
2 is a read-only memory (ROM), 3 is a random access memory (RAM), 4 is a video interface, 5 is a CRT, 6 is a keyboard interface, and 7 is a keyboard. FIG. 2 shows an example of the keyboard 7. As shown in FIG.

In Figure 1, the keyboard 7 is connected to the CPU 1,
ROM2 via keyboard interface 6
Detection is performed according to a predetermined procedure depending on the content of the information. As shown in FIG. 2, the keyboard 7 has a function assigned to each key. For example, assume that the "STOP" key in FIG. 2 is assigned the function of interrupting the processing of the currently executing program.

In this configuration, when using a personal computer, if the "STOP" key is pressed by mistake, the processing of the currently running program is interrupted. Interruption of processing due to an erroneous operation as described above poses a major problem depending on the application.

So far, this has been prevented by considering the placement of the "STOP" key (for example, pressing it farther away from other keys) or by adding a cover to the "STOP" key.

Purpose of the Invention The object of the present invention is to provide a terminal device that can prevent interruptions in processing due to malfunctions and other failures without special processing on the keyboard as in the conventional example. .

Structure of the Invention The present invention uses a functional element such as a microprocessor in the keyboard detection section, and makes the keyboard detection independent from the main CPU processing, thereby preventing failures such as interrupting program processing due to erroneous operation. It is.

DESCRIPTION OF EMBODIMENTS The configuration of an embodiment of the present invention will be described below with reference to the drawings.

In Figure 3, 21 is the CPU, 22 is the ROM,
23 is RAM, 24 is video interface, 2
5 is CRT, 26 is keyboard interface,
27 is a keyboard, and 28 is a keyboard detection processing section.

FIG. 4 shows the keyboard detection processing section 28 in FIG. 29 is CPU, 30 is ROM,
31 is a RAM, and 32 and 33 are I/O interfaces.

Next, the operation of the above embodiment will be explained.

In FIG. 3, the keyboard 27 is detected by the keyboard detection section 28, and the CPU 21 uses the contents of the ROM 22 via the keyboard interface 26 to detect the keyboard 27 according to a predetermined procedure.
Receive the detection results.

In this configuration, the functions assigned to each key of the keyboard are detected by the keyboard detection processing section 28.

Therefore, normally, when the "STOP" key shown in FIG. 2 is pressed, the keyboard detection processing section 28 shown in FIG. hand
In order to notify the CPU 21, as a result, the processing of the currently executing program is interrupted. Therefore, if you want to prevent the process from being interrupted by pressing the "STOP" key by mistake, use a predetermined key operation (for example, press three keys at the same time: "CTRL" key, "SHIFT" key, and ";" key). ), the keyboard detection processing section 28 operates to ignore any pressing of the "STOP" key. In this state, even if the "STOP" key is pressed, the CPU 21 will not receive a detection result indicating that the "STOP" key has been pressed. Therefore,
Even if the "STOP" key is pressed by mistake, the CPU 21 does not interrupt program processing. If you want to restore the function of the "STOP" key, perform a predetermined key operation (for example, press the "CTRL" key, "SHIFT" key, and "" key at the same time), and then the keyboard detection unit 28 teeth,
When the "STOP" key is pressed, the detection result is sent to the CPU 21 via the keyboard interface 26.
send to

In this way, the processing in the keyboard detection processing section 28 is performed independently of the CPU 21, so an operator operating a personal computer or the like can press the "STOP" key as necessary, regardless of the processing of the CPU 21. It becomes possible to prohibit or restore the detection of

FIG. 5 shows the basic configuration of the present invention. Fifth
In the figure, 34 is a key-on determination means for detecting whether a key is on or off from the output of the keyboard 27;
Reference numeral 5 denotes a key information storage means for storing valid key information associated with mode changes, and this key information storage means 35 stores key combinations (for example,
Combination with "CTRL" key, "SHIFT" key, ";" key to disable "STOP" key,
A combination of the "CTRL" key, "SHIFT" key, and "" key to enable the "STOP" key is stored. Reference numeral 36 denotes mode change comparison means 37 for comparing the output of the key-on determination means 34 and the key information storage means 35 to determine whether or not there is a mode change.
38 is a mode storage means for storing the mode contents based on the output of the mode change comparison means 36; and 38 is a key-on determination means 34 based on the output of the mode storage means 37.
output determination means for determining whether the output of the output is valid or invalid; 3
Reference numeral 9 represents data sending means for sending out a valid output from the output determining means 38, and 40 represents a main processing means for receiving the output from the data sending means 39 and performing main processing.

FIG. 6 is a flowchart showing part of the processing in the keyboard detection processing section 28.

Effects of the Invention The present invention has the above configuration, and according to the present invention, the following effects can be obtained.

(1) Since the operation of the keyboard detection processing section is performed independently of the main processing, the operator can easily change the functions assigned to each key on the keyboard when necessary. .

(2) Keyboard functions can be changed without changing the contents of the main processing program.

(3) Since functions can be changed by pressing a combination of keys simultaneously, no special hardware is required.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a conventional terminal device, FIG. 2 is a diagram showing the key arrangement of a keyboard, FIG. 3 is a block diagram of a terminal device according to an embodiment of the present invention, and FIG. 4 is a keyboard of the same terminal device. FIG. 5 is a block diagram showing the basic configuration of the present invention, and FIG. 6 is a flowchart showing part of the processing of the keyboard detection processing section of the terminal device. 21... Central processing unit (CPU), 22... Read only memory (ROM), 23... Random access memory (RAM), 24... Video interface, 25... CRT, 26... Keyboard interface, 27 ...Keyboard, 28...
...Keyboard detection processing unit, 29...Central processing unit (CPU), 30...ROM, 31...RAM, 32,
33...I/O interface.

Claims (1)

[Claims] 1. A keyboard, a key-on determination means for detecting whether a key is on or off from the output of the keyboard, a key information storage means for storing an existing key combination that determines whether a specific key of the keyboard is valid or invalid, and the key-on determination means. mode change comparison means for comparing the output of the means with the storage contents of the key information storage means to determine whether or not there is a mode change; mode storage means for storing the mode contents based on the output of the mode change comparison means; and this mode storage means. a keyboard detection processing section comprising an output determination means for determining whether the output of the key-on determination means is valid or invalid based on the output of the key-on determination means; and a data transmission means for transmitting a valid output from the output determination means; main processing means for receiving a key detection result and performing main processing, the terminal device characterized in that the keyboard detection processing section sets validity or invalidity of a specific key of the keyboard.