JP2839237B2 - Keyboard key code output device and output method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a key code output device and an output method for a keyboard. The present invention relates to a key code output device and an output method for a keyboard, in which a diode is not required and a malfunction is prevented. Conventionally, as a keyboard input device having an N-key rollover function, a device as shown in a block diagram of FIG. 4 has been known. In FIG. 4, reference numeral 41 denotes a key matrix.
A key 42 and a diode 43 are connected in series at respective intersections of a plurality of columns 41a and a plurality of lines 41b, and the keys 42 are arranged in a matrix. The key matrix 41 includes a column 41a in which the decoder 4
4 and a line 41 b is connected to a control unit (CPU) 45. 46 is a read-only memory (R
OM), which is connected to the CPU 45 and stores a program for outputting a key code and a key code. In this keyboard input device, when any key 42 of the key matrix 41 is pressed, a scan signal from the decoder 44 is connected in series with the key 42 pressed from the column 41a of the key matrix 41 and the key. The signal is transmitted to the line 41b through the diode 43 and then input to the CPU 45. The CPU 45 detects the pressed key 42 based on the position of the column 41a and the position of the line 41b when the scan signal is inputted, and reads a key code corresponding to the key 42 from the ROM 46, and reads out the key code. Output the key code. [0006] The keyboard [0006] when the high-speed typing is, there Ru case where a plurality of keys 42 moment are pressed at the same time. The so- called N-key rollover is such that when a plurality of keys are pressed, the key codes corresponding to the pressed keys 42 are all output without error. To achieve this N key rollover,
Known keyboard input devices required that a diode 43 be connected to each key 42 in series. The reason is that if three or more keys are pressed at the same time, current sneak may occur , causing current sneak.
And Jill is because up to 4 th keys not actually pressed is detected as those pressed. like this
In addition, a known keyboard with N-key rollover function
Input device is a diode to avoid
The key (current prevention diode) 43 is a key 42
As many as the number of keyboard input devices.
There was a problem that the cost was increased. To solve such a problem, a plurality of Keith
During one cycle during which the switch pressing state is searched once
The coincidence signal output from the Y multiplexer.
Counter and the number of counts
To disable the signal output during that cycle.
By providing a remote control circuit,
Even if there are no diodes connected in series, three or more
Sneak current when two key switches are pressed simultaneously
Key that prevents detection of non-operation key switches due to the occurrence of
Board control device disclosed in Japanese Patent Application Laid-Open No. Sho 54-1222928
Have been. Japanese Unexamined Patent Application Publication No.
The keyboard controller has three or more key switches simultaneously.
To detect the non-operation key switch when pressed
3 or more key switches, which can be prevented
When current is sneak when simultaneously pressed
Whether or not the signal output during that cycle
The same key switch must be operated again to disable
And it is difficult to perform high-speed keying.
Have [0008] The present invention is intended to solve these problems, and an object, and based on the N key rollover
And, along with reducing costs by eliminating the diode for preventing sneak current, it possible to perform high-speed keying
And a key code output device for a keyboard. [0009] In order to achieve the above object, a key code output device for a keyboard according to the present invention comprises a closing key setting unit, a current sneak determination unit, and a key code output unit. The closing key setting section sets key information indicating the arrangement position of the closing key, and the closing key generates a current sneak based on the key information set by the current sneaking determination section. It is determined whether or not it is the arrangement position to be performed. When it is determined that the arrangement position is the arrangement position, the determination information is output. The first and second closing keys are detected by the key code output unit. When the closing key is not detected,
The key code corresponding to the first and second closing key it
When the first and second closing keys are detected and the third closing key is detected, and when the third closing key is detected, the determination information is not output.
If the first and second closing keys are detected, the key codes of the first, second, and third closing keys are respectively output.
Upon detection of a closing key, the determination information is output field
If the key code corresponding to the first and second closing key its
Outputs Re respectively, is characterized in that operate, respectively, as not to output the key code corresponding to the third closing key. In order to achieve the above object, a key code output method for a keyboard according to the present invention comprises a first step of judging whether or not two closed keys are simultaneously detected when a closed key is detected; In this first step, two closing keys
When it is determined that the not detected simultaneously, the outputs of two the two key codes corresponding to closing key respectively 2
When it is determined in step and first step that two closing keys have been detected simultaneously, a third step for determining whether a new closing key has been detected, and in a third step, a new closing key is determined. when it is determined that not detected, a fourth step of outputting two two key codes corresponding to closing key, respectively, in a third step, detecting a third closing key
When it is determined that, the fifth step of determining whether or not the state sneak current occurs between the two closing key and the third closing keys, in the fifth step, the sneak current is issued < When it is determined that the state is not a live state, two closing keys and
Sixth step of outputting a key code corresponding to the third closing key, respectively, in the fifth step, when it is determined that the state of the sneak current is generated, the output of two key code corresponding to the closed key, respectively However, the method comprises a seventh step in which the key code of the third closing key is not output. In one embodiment of the present invention, a key code output device for a keyboard includes a plurality of keys provided at intersections of a plurality of row lines and a plurality of column lines; Signal supply means for supplying a scan signal to the line;
Selecting means for selecting a plurality of lines scanned by the scan signal; detecting a closing key pressed by a key operation in accordance with the supply of the scanning signal and selection of the line ; and a key code corresponding to the detected closing key. A key code output device for a keyboard, comprising: a control unit for outputting, wherein the control unit includes a closing key setting unit, a current wraparound determining unit, and a key code output unit.
Set the key information representative of the position of the closing key, the sneak current determination unit determines whether or not at the position where the closing key to generate a leak current based on the set key information, arranged When it is determined that the key is at the position, the determination information is output. The key code output unit detects the first and second closing keys, and when the third closing key is not detected, outputs the first and second keys. outputs of the key code corresponding to the closed key, respectively, also detects the first and second closing key, upon detection of a third closing key, the determination information is not output field
In this case , the key codes corresponding to the first, second, and third closing keys are output, and further, when the first and second closing keys are detected, and the third closing key is detected, , if the determination information is output, corresponding to the first and second closing key
The key code output respectively, and operates so as not to output the key code corresponding to the third closing key. [0012] In another embodiment of the present invention,
The key code output method of the keyboard includes a plurality of keys provided at intersections of a plurality of row lines and a plurality of column lines,
A scan signal is supplied to the line, a plurality of lines scanned by the supply of the scan signal are selected, a closing key pressed by key operation is detected, and a key corresponding to the detected closing key is detected. A key code output method for a keyboard for outputting a code, comprising: a first step of determining whether or not two closed keys are simultaneously detected when a closed key is detected; when it is determined that no <br/> detect the key at the same time, a second step of outputting two two key codes corresponding to closing key, respectively, first
In the step, when it is determined that two closing keys are simultaneously detected, a third step of determining whether a third closing key is newly detected, and in the third step, a third closing key is determined. when it is determined that not detected, a fourth step of outputting two two key codes corresponding to closing key, respectively, in the third step, when it is determined that it has detected a third closing key, Two closing keys and the third
A fifth step of determining whether or not the state sneak current occurs between the closing key, in the fifth step, when it is judged not to be the state in which the sneak current occurs, two closing key and a sixth step of outputting a key code corresponding to the third closing key respectively, in a fifth step, when it is determined that the state of the sneak current occurs, two key codes corresponding to closing key respectively And outputting a key code corresponding to the third closing key. According to one embodiment of the present invention, the control means is provided with a closing key setting section, a current sneak determination section, and a key code output section. set the key information representative of the position of, the sneak current determination unit, and outputs the determination information when closed key based on the set key information is a position for generating a sneak current, with the key code output section , when detecting only two closed keys the key code corresponding to the two closed key outputs respectively, if the determination information when detecting a three closing key is not output, three closing key each key codes respectively output corresponding to, if the determination information is output when detecting the three closing keys, two closed key
Each key code corresponding to the key is output, and it operates so as not to output only the key code corresponding to the third detected closed key. Therefore, the configuration excluding the diode connected in series to each key is adopted. No malfunction occurs, and the key code corresponding to the closing key is invalid
Without trying to output
Fast typing becomes possible, and it is possible to reduce the manufacturing cost. According to another embodiment of the present invention,
If it is determined that simultaneous detection of two closing keys is not performed
Yellow, two of the key code corresponding to the two closed key it
Each output, when the simultaneous detection of two closed key has been made
In, it is determined that there is a new closed key to the other is not detected
When two of their two key codes corresponding to closing key
And respectively output, when the simultaneous detection of two closed key has been made
A, it is determined that a new closed key is detected, and, if the sneak current is determined not to occur between the two closing key and the new closing key, the two closing key and the new the key code corresponding to output to a closing key, 2
One of when the simultaneous detection of closing key is performed, the key is determined as a new closed key is detected, and, if it is determined that the state of the sneak current is generated, corresponding to two closed key Although each code is output, the key code corresponding to the new closing key is not output, so
Structure, except for the diodes connected in series to each key
The key code corresponding to the closing key is output as much as possible without causing a malfunction even if
Because it is made to force, high-speed keying is possible,
Manufacturing costs can be reduced . Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of a key code output device for a keyboard according to the present invention.
FIGS. 3A to 3D are explanatory diagrams showing an example of the state and stored contents of a RAM shown in FIG. 1. FIG. 3 is a flowchart showing an embodiment of a key code output method for a keyboard according to the present invention. It is. In FIG. 1, reference numeral 1 denotes a key matrix in which keys 2 are connected to respective intersections of a plurality of columns 1a and a plurality of lines 1b, and the keys 2 are arranged in a matrix. In the key matrix 1, the column 1a is connected to the decoder 4, the line 1b is
That is, it is connected to the CPU (control means) 5. Also,
Reference numeral 6 denotes a read-only memory (ROM) which is connected to the CPU 5 and stores a program for outputting a key code and a key code. The CPU 5 is provided with a RAM (closed key setting unit) 7 for storing key information in a flag format (hereinafter, referred to as a flag) corresponding to an arrangement position of each key 2 of the key matrix 1 therein. I have. In this case, when one of the keys 2 is pressed and the CPU 5 detects that the key 2 is closed, the RAM 7 corresponds to the detected position of the closed key 2.
Is set to "1", and when the closing key is released, the flag is set to "0". In this configuration, as shown in FIG. 2A, keys 2 at positions 2, 14, and 17 (hereinafter, these keys are referred to as key No. 2, key No. 1)
4, the same applies to the keys in other positions, such as key No. 17).
Is detected, the contents stored in the RAM 7 are as shown in FIG.
As shown in (b), key No. 2, key No. 14,
The flag of the arrangement position of the key No. 17 becomes "1". However, since the key No. 2 and the key No. 14 are on the same column 1a, and the key No. 2 and the key No. 17 are on the same line 1b, it is possible to prevent the current from sneaking. Are not connected, the keys No2, No14, N
In addition to o17, key No5 is also detected as a closing key. In this embodiment, when three keys No. 2, No. 14 and No. 17 are simultaneously detected as closing keys, the following operation is performed. First, three keys No. 2, No. 14, No.
If the key No. 2 in No. 17 is detected as a closed key, the key N on the same column 1a as the key No. 2
o14 is also detected as a closing key. At this time, CPU
5 is that if the key No. 2 side is processed first, RA
The flag of the arrangement position of key No. 2 in M7 is set to "1". Next, the CPU 5 determines whether or not to output the key code corresponding to the key No.
The determination is made based on the presence or absence of the flag “1” at the arrangement position. At this point, the key No. 2 is the only key processed first by the CPU 5, and the key (the memory 7) already processed on the same line 1b and the same column 1a as the key No. 2
The CPU 5 reads the key code corresponding to the key No. 2 from the ROM 6 and outputs the read key code. Next, when the CPU 5 processes the key No. 14 side, the flag of the arrangement position of the key No. 14 in the RAM 7 is set to "1". Here, as in the case described above, the CPU 5 determines whether to output the corresponding key code based on the presence / absence of the flag “1” of the arrangement position of the key No. 14 in the RAM 7. At this point, the key N
Keys already processed on the same line 1b as o14 (those for which the flag of the arrangement position of the memory 7 is "1")
Does not exist, but a flag "1" for the arrangement position of the key No. 2 already processed exists on the same column 1a.
Here, the CPU 5 determines that the key already processed on the same line 1b as the key No.
1 ") is determined.
In this determination, there is no key already processed on the same line 1b as the key No. 2, so the CPU 5 reads out the key code corresponding to the key No. 14 from the ROM 6 and outputs the read key code. Thereafter, in the CPU 5, the key No. 1
7 is processed, the key No. 1 in the RAM 7 is processed.
7 is set to "1". At this time, since the key No. 2 and the key No. 14 are both still detected as closed keys, the scan signal supplied to the key matrix 1 is changed from the key No. 17 to the key No. 14 and the key N
The key No. 5 is input to the CPU 5 via o2, and at the same time, the unpressed key No. 5 is detected as a closed key as if pressed by the current wraparound. , Key No5
Is also detected as a closing key, and the flag of the arrangement position of the key No. 5 in the RAM 7 is set to “1”. Here, the CPU 5 processes either the key No. 17 or the key No. 5 first, but even if the key No. 17 and the key No. 5 are processed first, the CPU 5 does not process the key No. 17 or the key No. 5 for the following reason. , And the key codes corresponding to the key Nos. 5 and 17 are not read from the ROM 6, and the read key codes are not output. That is, in the CPU 5, the key No.
Assuming that the 17 side is processed first, at this time, three flags “1” of the key arrangement position in the RAM 7 already exist, and the key is placed on the same line 1 b as the key No. 17. There is a flag “1” for the arrangement position of No. 14 and the key No.
Since there is a flag “1” at the arrangement position of No. 2, the CPU 5
The key code corresponding to the key No. 17 is not read out from the ROM 6, and this key code is not output. Similarly, when processing the key No. 5 side in the CPU 5, the flag of the key No. 5 arrangement position in the RAM 7 is "1" at this time, and the flag of the key arrangement position in the RAM 7 is "1". There will be four 1 ". Then, the key No. is placed on the same line 1b as the key No. 5.
Since there is a flag “1” at the 17th arrangement position and the arrangement position flag “1” of the key No. 2 on the same column 1a as the key No. 5, the CPU 5
Is not read from the ROM 6, and this key code is not output. As described above, when a plurality of keys are pressed at the same time, a certain state occurs, that is, a state in which current sneak occurs, and the third key operation is performed when a key operation causes a malfunction. A key code corresponding to the closing key detected thereafter is not output. In addition,
In the cases shown in FIGS. 2 (c) and 2 (d), respectively, there is a malfunction in the key operation, that is, the key No.
Although the key is not pressed as shown in FIG.
Since there is no key detected as o5, all the key codes corresponding to the pressed key are output. Next, an embodiment of a key code output method for a keyboard according to the present invention will be described with reference to the flowchart shown in FIG. First, in step S1, the CPU 5
Determines whether two keys, for example, keys A and B, are both detected as closing keys. If it is determined (Y) that it has been detected, the next step S2
When it is determined (N) that no detection has been made,
The process moves to another step S3. Next, in step S2, the CPU 5
Determines whether the key C is newly detected as the closing key. Then, if it is determined (Y) that it has been detected, the process proceeds to step S4, and if it is determined that it has not been detected (N), the operation of this series of flowcharts is terminated. In step S3, the CPU 5
Determines whether key C has been detected as a closing key. If it is determined (Y) that detection has been made, step S9
When it is determined (N) that no detection has been made,
The operation of this series of flowcharts ends. In the following step S4, the CPU 5
Sets the flag of the arrangement position of the key C in the RAM (memory) 7 to "1". Subsequently, in step S5, the CPU 5
Determines whether the positions of the keys A or B and the keys C are on the same line 1b of the key matrix 1 or not.
When it is determined (Y) that they are on the same line 1b, the process proceeds to the next step S6, and when it is determined that they are not on the same line 1b (N), the process proceeds to another step S7. Next, in step S6, the CPU 5
Determines whether there is a flag "1" for the location of the key A on the same column 1a as the flag "1" for the location of the key B in the RAM (memory) 7. When it is determined (Y) that there is a flag “1” for the arrangement position of the key A,
When the operation of this series of flowcharts is terminated and it is determined (N) that there is no flag "1" for the arrangement position of the key A, the process proceeds to another step S10. In step S7, the CPU 5
Determines whether the arrangement positions of the key A or the key B and the key C are on the same column 1a of the key matrix 1.
Then, when it is determined (Y) that they are on the same line 1b, the process proceeds to the next step S8, and when it is determined that they are not on the same line 1b (N), the process proceeds to another step S10. Next, in step S8, the CPU 5
Determines whether there is a flag "1" for the location of the key A on the same line 1a as the flag "1" for the location of the key B in the RAM (memory) 7. When it is determined (Y) that there is a flag “1” for the arrangement position of the key A,
When the operation of this series of flowcharts is terminated and it is determined (N) that there is no flag "1" for the arrangement position of the key A, the process proceeds to another step S10. Further, in step S9, the CPU 5
Sets the flag of the arrangement position of the key C in the RAM (memory) 7 to "1". Subsequently, in step S10, the CPU
5 outputs a key code corresponding to the key C, and terminates the operation of this series of flowcharts. As described above, according to the present invention, when a plurality of keys are pressed, the arrangement positions of the plurality of keys are not pressed due to a specific malfunction state, that is, current sneak. If the up key is not ready is detected as closed key, the pressed all keys key code corresponding to the to the output respectively, when the plurality of keys is pressed, positions of the plurality of keys If There particular malfunction state, i.e., not ready to up key that is not pressed by the sneak current is detected as a closed key
In this case , key codes corresponding to a plurality of closing keys on one column or line are output, and further,
If the arrangement positions of the plurality of closing key and the rest of the closing key is the specific malfunction state, a key code corresponding to the plurality of closing keys has to be outputted, the remaining closing key since so as not not output the key code corresponding to, in the case where the arrangement position of the pressing plurality of keys has been became to a particular malfunction state also corresponds to the previous closing key the malfunction state is detected not only does not occur a malfunction even if also so ,, each key key code is outputted with a configuration that eliminates the diodes are connected in series, to disable the key code corresponding to the closed key without a manner not <br/> Runode as to minimize the output, it is possible to perform high-speed keying, low manufacturing cost, there is an effect of obtaining a keyboard having high reliability

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a key code output device for a keyboard according to the present invention. FIG. 2 is an explanatory diagram showing an example of a state and stored contents of a RAM shown in FIG. 1; FIG. 3 is a flowchart showing one embodiment of a key code output method for a keyboard according to the present invention. FIG. 4 is a block diagram illustrating an example of a known keyboard input device having an N-key rollover function. [Description of Signs] 1 key matrix 1a column 1b line 2 key 4 decoder 5 control unit (CPU) 6 ROM 7 RAM (memory)

Claims (1)

(57) [Claims] A plurality of keys provided at intersections of a plurality of row lines and a plurality of column lines; signal supply means for supplying a scan signal to the lines; and selection for selecting the plurality of lines scanned by the scan signals And a control means for detecting a closing key pressed by a key operation in accordance with the supply of the scan signal and the selection of the line , and a control means for outputting a key code corresponding to the detected closing key. A code output device, wherein the control means includes a closing key setting unit, a current sneak determination unit, and a key code output unit, wherein the closing key setting unit indicates an arrangement position of the closing key. set the key information, the sneak current determination unit arrangement position of the closing key to generate a leak current based on the set key information
Determining whether or not at the location, the output determination information when it is determined <br/> to be in the position, the key code output unit, first and second detecting closing key When the third closing key is not detected, key codes corresponding to the first and second closing keys are output, respectively , and the first and second closing keys are detected. 3
Upon detecting the closing key, when the judgment information is not output, corresponding to the first, second and third closing key
And the key code output respectively, further, the first and second detecting the closed key, upon detecting the third closing key, when the judgment information is outputted, the first及
And the key code corresponding to the second closing key
And operating so as not to output a key code corresponding to the third closing key. 2. A plurality of keys provided at intersections of a plurality of row lines and a plurality of column lines; a scan signal supplied to the line; and a key operation by selecting the plurality of lines scanned by the supply of the scan signal in detecting the pressing has been closed key, a key code output method of the keyboard for outputting a key code corresponding to the detected closed key, upon detection of the closing key, at the same time two the closing key a first step of determining whether the detected in said first step, when it determines that it has not detected the two closing keys simultaneously <br/>, corresponding to the two closed key a second step of outputting two key codes respectively, in the first step, when it is determined that detection of the two closing keys simultaneously, newly determines whether it has detected the third closing key You Third and step, in the third step, detecting the third closing key
A fourth step of outputting two key codes respectively corresponding to the two closing keys when it is determined that the third closing key has not been detected, and detecting the third closing key in the third step
When it is determined that the, the fifth step of determining whether or not the state sneak current occurs between the two closing key and the third closing key, in the fifth step, the current when it is judged not to be the state in which the wraparound occurs, a sixth step of outputting the two closing key and the key code corresponding to the third closing key respectively, in the fifth step, the sneak current is generated when it is determined that state, a key code corresponding to the two closed key outputs, to the third closing key
And a seventh step of not outputting a corresponding key code.