JPS61249128A - Input device - Google Patents

Abstract

PURPOSE:To obtain an input device which is capable of roll-over of N pcs. of key at low cost, by providing a scroll buffer, a pending buffer, a key buffer, and an off waiting buffer for key-in information of key switches. CONSTITUTION:When keys A and B are depressed simultaneously, key-in information A and B are stored in a pending buffer PB 12. When a key I is depressed next, key-in information A and B are recognized as on information, and key-in information A and B are registered in a key buffer KB 13, and ''O'' is set to count data of an off waiting buffer (OWB) 14. When key-in information J is taken into the PB 12 at this time, four keys are taken in as the total, and this key-in information is not taken into the KB 13. When the key A is released, the image of key-in information J is erased, and key-in information B and I are recognized and are registered in the KB 13 and the OWB 14. Key-in information J of the PB 12 is erased from the PB 12 as imaginary key-in information.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an input device that processes key-in data input from a key matrix.

[Conventional technology]

Conventionally, in this type of device, there are input devices that process key-in data from a key matrix without using diodes.

In such models, when three keys are pressed at the same time, it functions as if four keys were pressed, so the number of keys that can be pressed at the same time is limited to two, and three keys are pressed at the same time. Configured to lock out the eyes.

There is also an input device that stores key-in information by arranging diodes in a key matrix, but this is an N-key rollover type and can process up to n key-in information at the same time. , 1 to 1, and there was a problem that the cost was extremely high.

[Problem that the invention seeks to solve]

Since conventional models are configured as described above, the number of keys that can be entered at the same time is limited, leading to problems such as a decrease in key input efficiency.

This invention was made to solve the above problems, and it is possible to use the N-key system without significantly changing the conventional configuration.
The purpose of the present invention is to provide an input device that can be rolled over and is inexpensive.

[Means for solving problems]

The input device according to the present invention includes a scroll buffer that sequentially stores key-in information of key switches, a pending buffer that stores only key-in information that is continuously keyed in among the key-in information stored in the scroll buffer, and A key buffer that stores key-in information that is continuously entered in the pending buffer in the key-in order, and an off-waiting buffer that counts the key-in information stored in this key buffer and the key-off state of this key-in information each time a key switch is pressed. It was established.

[Operation] In this invention, each time a key switch arranged in the key matrix is pressed, key-in information is sequentially stored in the scroll buffer, and only the key-in information to be keyed in is continuously stored in the scroll buffer. The key-in information is sequentially stored in the key buffer and written in the off-waiting/output buffer, and when a plurality of key switches are pressed, the key-in information is sequentially accepted. In addition, the off-state of the key switch that inputs the key-in information held in the off-waiting buffer is counted each time the key-in is performed sequentially, and when the count reaches a predetermined number, the key-in information is transferred from the off-waiting buffer. to erase.

〔Example〕

FIG. 1 is a configuration diagram of an input device showing an embodiment of the present invention, in which 1 is a CPU, a processing unit MPU, a ROM 1a that stores control procedures to be described later, and a RAM 1b that stores data.
A key switch group 2 arranged in a key matrix
Boat A and Boat B accept key-in information from
have.

Boat A and BO) B are composed of, for example, 8 bits, and include boat input AO"A7" and boat input BO"B7.
have.

FIG. 2 is a functional block diagram of the CPU 1 shown in FIG. 1. 11 is a scroll buffer, and when a desired key switch of the key switch group 2 is pressed, key-in information 1, such as 1rAJ to fcJ, is sent to the scroll buffer. Accepts data sequentially and stores 8 bytes of key-in information. Reference numeral 12 denotes a pending buffer composed of, for example, 3 bytes, which stores only key-in information that is continuously keyed in, out of the key-in information stored in the scroll buffer 11. For example, 13 is 8
A key buffer consisting of 0 bytes stores key-in information that is continuously keyed into the pending buffer 12 in key-in order. 14 is an off-waiting buffer composed of, for example, 6 bytes, which counts the key-in information stored in the key buffer 13 and the key-off state of this key-in information every time a key switch is pressed, and when this count value reaches a predetermined number, , clear its key-in information.

FIG. 3 shows the off-waiting buffer 14 shown in FIG.
This is a schematic diagram showing data divisions, in which counter data 21a to 21c are stored in 2-byte units.

Next, while referring to FIG. 4, let's discuss the operation shown in FIG.

I will explain.

FIG. 4 is a state transition diagram illustrating the flow of key-in information according to the present invention, and the same parts as in FIG. 2 are given the same reference numerals. Note that (1) to (15) indicate the key switch procedure.Hereinafter, a case will be described in which the A to F keys of the key switch group 2 are sequentially keyed in. Also,
Each step procedure is stored in the ROM 1a, and the processing unit M
PU analyzes and controls.

When the A key is pressed, scroll buffer (SB) 1
1 and the pending buffer (F
B) Key-in information rAJ is stored at the beginning of 12 (
1) When the B key is pressed next, the B key and A key will be recognized, but the key-in information rAJ is already PB1.
2, the A key is assumed to be on, and the key-in information rA is stored in the key buffer (KB) 13, and the off-waiting buffer (OWB) 14 is stored in the off-waiting buffer (OWB) 14.
and sets the counter data 21a to ``01'' (indicating the key-on state) (2).

Next, when the C key is pressed, the A-C key is recognized.

At this time, the A key is waiting to be turned off, but it is currently in the on state, so the counter data 21a is not updated and becomes [)J, and the key-in information rBJ is already registered in PH10, so it is assumed to be on and stored in KB13. ,OW
B 14 and set the count data 21b to l'OJ (3). Next, when the D key is pressed, A-D
The key is recognized and the A key and B key are waiting to be turned off, but
Since it is currently on, the count data 21a, 21
Set b to rOJ without updating. C key is already PH1
Since it has already been registered as 0, it is assumed to be on and stored in KB 13, and also stored in 0WB14, and the count data 21
Set c to rOJ. At this time, key-in information rDJ
is stored in PH12 (4). Next, when the E key is pressed, the A-E key is recognized. The A-C key is waiting to be turned off, but it is currently turned on, so the count data 2
1a to 21c are not updated and set to i'OJ. "Key-in information rD" is already registered in PH10,
Since there is no space in 0WB14, the state is maintained as it is. Then, the key-in information rE that was key-in later
Store J after key-in information rDJ (5) 0th order F
When a key is pressed, the A-F keys are recognized. A-C
Although the key is waiting to be turned off, it is currently turned on, so the count data 21a to 21c are not updated and set to IJ. The D and F keys are already registered in PH10, but there is no space in OWB 14, so they can be used as is in PH12.
Then, the key-in information rFJ of the F key that was keyed in later is stored in the key-in information section after F (6).

Here, if the C key is pressed, the G key will not be registered in any buffer, because PH1
2,0 This is because there is no space in the WB14.0 Next, when the A key is released, the BF keys are recognized. Here, the count data 21a is updated to "1" and waits for turning off again, and since the count data 21b and 21c are still on, they are not updated and set to rOJ (7)0 Next, B When the key is released, the C-F key is recognized.

At this time, the counter data 21a is updated to r2j, the count data 21b is updated to rlJ, and it waits for it to turn off again, but the C key is still on, so
It is not updated and is set to rOJ. The D-F key is still
Since there is no free space in OWB 14, the current state is maintained (8).

Next, when the C key is released, the count data 21a to 21c of OWB 14 are updated by rlJ, but since the count data 21a becomes r3J, the A key is considered to be off,
Deleted from OWB 14. Furthermore, among those already registered in PH10 and currently on, the oldest D key is recognized as on, and is stored in KB13.
Store key-in information rDJ in OWB 14 (8),
As a result, the key-in information rDJ is removed from PH12, and the subsequent key-in information rEJ and rFJ are each shifted from PH12 and stored (10). Next, when the D key is pressed, the count data 21a to 21c of OWB14 are updated rlJ. At this time, since the count data 21b becomes r3J, from 0WB14,
Delete the key-in information rBJ and delete the oldest key registered in PH10 that is still turned on (PH12
The key-in information rEJ, which is the first data of , is recognized as on, and is stored in KB13 as well as in 0WB14. Then, the key-in information rEJ is removed from PH12, and the subsequent key-in information rFJ is shifted to the beginning of PH12 and stored (11). Next, when the E key is released, the count data 21a to 21c of 0WB14 are respectively stored. rlJ is updated, and at this time, the count data 21c
is 131, so it is recognized that the %C key is turned off, and O
The key-in information rFJ is deleted from WB 14 to create an empty area in 0WB 14, and the key-in information rFJ is stored in that empty area. At this time, all data is lost in the PH 12, and the key-in information rDJ to rFJ are waiting to be turned off (12).

In the next scan, no keys are keyed in, so the OWB 14 count data 21a to 21c are updated and the key-in information rDJ is removed. Since the key-in is not performed, the count data 21a to 21 of 0WB14
Update c and remove key-in information 1rEJ < (14
), (15) As a result, the key-in information rAJ to rFJ is stored in the KB 13 in the order in which the keys are pressed.

Next, the operation of accepting key-in information will be further explained with reference to FIG.

FIG. 5 is a data transition diagram illustrating the operation of accepting key-in information. Note that (21) to (24) indicate each step.

When the Go and B keys are pressed at the same time (21), the FBI
Key-in information rAJ, FBI is stored in 0
Next, when the ■ key is pressed, the already registered key-in information rAj and fBJ are recognized as on information, and KB13
+-ear information rAJ, rBJ is registered in the +-ear information rAJ, rBJ, and rO is registered in the count data 21a, 21b of OWB 14.
Set J. However, at this point, the key-in information r
When JJ is imported into FBI2, a total of four keys have been imported, so it is not imported into KB13 (22) 0 When the A key is released next, the image of key-in information rJJ is erased, Key-in information FBI
, rIJ are recognized and registered in KB13 and 0WB14 (23). Here, if we count the number of key-ins, the actual key-in information is rBJ,
There are two pieces of rIJ, but FBI2 key-in information rJJ
is registered, the key-in information rJJ is deleted from the FBI 2 as fictitious key-in information (24).

In the above embodiment, the case where the storage space for OWB 14's key-in information is equivalent to three keys is explained, but if this is set to n, it is possible to manually perform keys closer to N-key rollover. Become.

〔Effect of the invention〕

As described above, the present invention includes a scroll buffer that sequentially stores key-in information of key switches, a pending buffer that stores only key-in information that is continuously keyed in among the key-in information stored in the scroll buffer, A key buffer that stores key-in information that is continuously entered into this pending buffer in the order of key-ins, and an off-waiting buffer that counts the key-in information stored in this key buffer and the key-off state of this key-in information each time a key switch is pressed. Since this is provided, there is an excellent effect that N-key rollover is possible and low-cost key manpower can be achieved without significantly changing the conventional configuration.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of an input device showing an embodiment of the present invention;
FIG. 2 is a functional block diagram of the CPU shown in FIG. 1, FIG. 3 is a schematic diagram showing data divisions of the off-waiting buffer shown in FIG. 2, and FIG. 4 is a state explaining the flow of key-in information according to the present invention. Transition Diagram FIG. 5 is a data transition diagram illustrating the operation of accepting key-in information. In the figure, 1 is a CPU, 1a is a ROM, lb is a RAM, 2 is a key switch group, 11 is a scroll buffer, 12 is a pending buffer, 13 is a key buffer, 14 is an off-waiting buffer, 21a to 21c are count data, MPU is the processing section. Figure 2 F: 4f3 F) To νν

Claims (1)

[Claims] In an input device that processes key-in information from key switches arranged in a key matrix, a scroll buffer sequentially stores key-in information of the key switches;
Among the key-in information stored in this scroll buffer, there is a pending buffer that stores only the key information that is continuously keyed in, a key buffer that stores the key-in information that is continuously keyed into this pending buffer in the order of key-in, and An input device comprising: key-in information stored in a key buffer; and an off-waiting buffer that counts a key-off state of the key-in information each time the key switch is pressed.