JPH0313610B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a character processing device, and more particularly to a device for outputting a correct code corresponding to the type of connected keyboard unit in a character processing device to which various keyboard units are connected. be.

We have entered the era of office automation.
Different types of keyboard units have come to be connected to the terminal devices of processing systems. As is well known, the keyboard unit (hereinafter referred to as KBU)
The JIS standard KBU and many types outside this standard are used.
KBU, and the character code generated by key operation differs depending on the KBU. For this reason it is connected
In order to correctly generate a character code generated by a key operation using a KBU, a control unit that outputs a character code based on key press information needs to obtain information on the type of KBU. For this reason, in the past, an identification code indicating the type of KBU connected to a terminal device was set by hardware means such as a pin connection, and this information was recognized by the control unit. However, in a KBU equipped with a key matrix (number of addresses: 256), the key matrix generally uses only about 200 addresses, so if the condition signal from the remaining addresses is used as information indicating the type of KBU, the terminal device Hardware for pin setting is not required, and incorrect connections can be prevented.

The present invention has focused on the above points, and an object of the present invention is to provide a device that can easily identify a keyboard unit even when different types of keyboard units are connected, and can output a character code.

The present invention provides a key matrix consisting of row lines and column lines with keys arranged at required intersections, a count value for sequentially selecting one line of the key matrix, and a count value obtained from the other line of the key matrix. a keyboard unit having means for transmitting a keyboard signal consisting of key data; a character data section for storing a character code; and a control unit consisting of a recognition unit that reads and outputs,
and in a device in which a plurality of types of keyboard units with different key arrangements can be connected to the control unit, in the key matrix, an intersection point where no keys are arranged and corresponds to the type of the keyboard unit is provided. A connecting element is connected between the row line and the column line at the intersection, and the recognition unit recognizes the character based on information on the intersection to which the connecting element is connected from the keyboard signal and information on the intersection at which the key is pressed. This is a character code output device characterized by reading and outputting a character code from a data section.

Hereinafter, the present invention will be explained with reference to the drawings. The drawing is a block diagram illustrating an embodiment of the present invention.
1 and 7 are keyboards, 2 is a pulse generator, 3 is a counter, 4, 41, and 42 are registers, 5 is a decoder, 6 is an encoder, 8 is a control unit, 9 is a recognition unit,
10 is a character data section (specifically, a memory in which character codes are stored), 11 is a processing device, A and B are keyboard signals, C is a character code, D ₁ and D ₂ are diodes, E is a pulse signal, and F is a key matrix, X, Xa, and Xb are key data, Y, Ya, and Yb are count values, a is an intersection point, and A, B, C, and D are output terminals.

First, a method will be described in which, in the apparatus shown in FIG. 1, the position of the intersection point where a key is pressed on the key matrix is recognized and the corresponding character code is obtained. (This is based on a well-known technique.) The key matrix F of the keyboard units 1 and 7 in the drawing is composed of row lines and column lines, forming a large number of intersections. A key (not shown) is placed at the intersection.

When the keyboard units 1 and 7 are connected, the pulse generating section 2 immediately operates under control such as a start command sent from the control section 8 (not shown).
The pulse signal E is continuously generated from the pulse generator 2, and the counter 3 sequentially counts up.

In response to the output of the counter 3, output terminals A, B, C and D of the decoder 5 are sequentially selected, and a signal is applied to the row line of the key matrix F connected thereto.

At the same time, the count value Y, which is the output of the counter 3, is set in the 41 part of the register 4, and this count value Y is set at the position in the column direction of the key matrix F (a, b, b,
The data shows C and D.

Here, when a key not shown is pressed, the intersection point a of the key matrix F becomes conductive, and the signal applied to the row line from the output terminal C of the decoder 5 passes through the intersection point a and is input to the encoder 6, and the key data X It is set in the 42nd part of register 4 as follows.

In this way, when the value of the counter 3 is, for example, "0", the output terminal A of the decoder 5 is selected, and when the value is "2", the output signal C is selected, so the count value Y of the register 41 and the register A keyboard signal A consisting of 42 key data X is converted into a pulse signal E.
The data is sent to the control unit 8 at the same cycle.

The control section 8 that receives the keyboard signal A recognizes the information on the count value Y of the keyboard signal A, that is, the position of the row line, and the information on the key data X, that is, the position of the column line.

Note that the recognition unit 9 recognizes chattering when a key is pressed,
Double keystrokes must be detected by checking whether other keys are being pressed, and security controls for these operations must be performed.

Therefore, the recognition unit 9 collects information on each intersection at least 2 times.
Scan more than once. The scan reads the keyboard signal A every time there is a change in the output of the counter 3, which is running at regular intervals due to the generation of pulses by the pulse generator 2. Through this scan, the recognition unit 9 reads and stores the keyboard signals defined on the matrix, and recognizes the intersection position of the pressed keys every cycle of the counter. By recognizing all the intersection point information for one scan cycle, the recognition unit 9 performs control to ensure against operations such as chattering when pressing a key and double key presses.

When the intersection point where the key was pressed normally is recognized, the recognition unit 9 generates a read address based on the intersection point information, accesses the character data section 10 in which the character code is stored, and selects the intersection point of the pressed key. The character code C corresponding to is taken out and sent to the processing device 11.

By the way, the character data section 10 stores character codes as described above, but in a device configured to connect a plurality of keyboard units, the character data section 10 stores character codes that differ depending on the type of keyboard unit. Since a table of key codes is provided, different read addresses need to be generated.

The present invention provides a device that outputs the correct character code corresponding to the type of keyboard unit in a device in which keyboard units of different types can be connected to a control unit that outputs the corresponding character code based on the intersection information of the pressed keys. It provides: Embodiments of the character code output device of the present invention will be described in detail below.

Key matrix F has, for example, 256 intersections (16 rows x 16 columns), but the number of intersections at which keys are arranged varies depending on the type of keyboard unit, but there are approximately 200. There are several dozen unused intersection points in common among all types of keyboard units.

Therefore, among these common unused intersection points, the key matrix F of the keyboard unit 1 is connected with a connecting element, such as a diode D 1, at the intersection shown in the figure, and the key matrix F of the other keyboard unit 7 is connected with a connecting element, for example, a diode D ₁ . different intersections (e.g. diode
Connect the diode at the position shown by D ₂ ).

In this way, the connection intersections of the diodes of the key matrix F are made different to generate a signal indicating the type of keyboard unit.

As mentioned above, the counter 3 counts up sequentially, and upon receiving the output of this counter 3, the decoder 5
Output terminals A, B, C, and D are sequentially selected and signals are applied to the row lines of the key matrix F.

On the other hand, as described above, in the keyboard unit 1, the diode _D1 is connected to, for example, the intersection point in the figure of the key matrix F, so that the keyboard signals Xa and Yb are sent as the keyboard signal A to the control section 8.

Similarly, when the keyboard unit 7 is connected, since the diode _D2 is connected to another intersection, the keyboard signals Xa and Yb are sent to the control section 8 as the keyboard signal B.

The keyboard signal sent from the register 4 to the recognition unit 9 is sent at the same cycle as the pulse signal E from the pulse generator 2. That is, as described above, since the scan of the intersection position where the key is pressed is executed, the recognition unit 9 recognizes the identification signal of the keyboard type defined on the key matrix by this scan. Store this.

Based on the keyboard identification information obtained in this way and the intersection information obtained by key operations, the recognition section 9 determines the read address for accessing the character code section 10, reads out the character code C, and sends it to the processing device 1.
Send to 1.

As described above, the present invention has a simple configuration in which connection elements are added to unused intersections on the key matrix on the keyboard unit side, and there is no need to add special hardware to the connection part with the processing device. ,
It also has the advantage of solving the inconvenience of resetting the conditions each time the keyboard is connected and preventing connection errors.

[Brief explanation of drawings]

FIG. 1 explains one embodiment of the present invention, and the symbols used in the figure are as follows. 1 and 7 are keyboards, 2 is a pulse generator, 3 is a counter, 4, 41, and 42 are registers, 5 is a decoder, 6 is an encoder, 8 is a control unit, 9 is a recognition unit, 10 is a character data unit, and 11 is a processing device, A,
B is the keyboard signal, C is the character code, D ₁ , D ₂
is a diode, E is a pulse signal, F is a key matrix, X, Xa, Xb are key data, Y, Ya,
Yb is the count value, a is the intersection point, and A, B, C, and D are the output terminals.

Claims (1)

[Claims] 1. A matrix consisting of row lines and column lines in which keys are arranged at required intersections, a count value for sequentially selecting one line of the key matrix, and a count value for sequentially selecting one line of the key matrix from the other line of the key matrix. a keyboard unit having means for transmitting a keyboard signal consisting of key data obtained; a character data section storing a character code; A device comprising a control unit comprising a recognition unit that reads and outputs lines, and to which a plurality of types of keyboard units having different key arrangements can be connected, wherein in the key matrix, among the intersection points, A connecting element is connected between the row line and the column line of the intersection where no keys are arranged and corresponds to the keyboard unit type, and the recognition unit detects the intersection to which the connecting element is connected based on the keyboard signal. A character code output device characterized in that the character code is read out and outputted from the character data section based on information and information on an intersection point at which a key is pressed.