JPS61109130A - Key scan control system - Google Patents

Abstract

PURPOSE:To promote the integrated and shared use of a keyboard by allocating the data for selection of modes to an idle port of a controller having a scan type keyboard. CONSTITUTION:A microprocessor (control part) 11 for control of keyboard which controls the transfer of data between a key matrix circuit 12 and the main body of a device always transfers the data obtained through the key scan to said main body. The circuit 12 contains switches arrayed in a matrix and is scanned by the signal produced by a decoder 13 with the key address given from the control part 11. Here the 3-bit ports P0-P2 are allocated to the scan purpose among those 8-bit ports of the part 11. While a 1-bit port P7 is allocated to the mode setting purpose. Then the lock-out/roll-over mode is set by a switch 14. Thus the part 11 refers to the port P7 before scanning and then recognizes the relevant mode for scanning.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a key scan control method that allows lockout/rollover mode selection using one keyboard unit.

[Technical background of the invention and its problems]

The scan type keyboard 1' has a data capture mode K, lockout, and rollover. For example, when the latter is scanned twice with an interval of 5 milliseconds and both are turned on, the buffer in which the key code 0 is stored and the key code of the key that was pressed during the previous scan are stored. In particular, it is determined whether the key was pressed or released by comparing the contents of the buffer with the contents of the buffer.

The above method is most suitable for operators such as typists who can perform manual keystrokes at high speed, and is not suitable for operators who are relatively beginners. That is, even if the currently pressed key is not released, the next pressed key data will be input. In order to solve this problem, it is necessary to prepare a separate keyboard unit that operates in lockout mode.

[Purpose of the invention]

The present invention has been made in view of the above circumstances.It is possible to lock out/roll auto with one keyboard unit?
By realizing the mode configurable keychain,
The purpose is to provide a keyboard unit that can be shared by both beginners and experts.

[Summary of the invention]

In order to achieve the above object, the present invention uses mode selection (lockout/rollover) when the controller (including the microcomputer) of the Scanline keyboard has an idle date.
Nodame data is allocated, and the controller recognizes this under instructions from an externally connected switch to determine the data import mode.

Because of this, one keyboard unit can be operated in both lockout and rollover modes, and both beginners and experts can share the same keyboard unit.

[Embodiments of the invention]

Hereinafter, embodiments of the present invention will be described in detail using the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention.
The internal structure of the keyboard unit is shown. In the figure, 1
Reference numeral 1 denotes a keyboard control microprocessor (hereinafter simply referred to as control section 11) that controls data transmission between the key matrix circuit 12 and the main body (not shown). The control unit 11 always sends scan signals (5CNo to SCN,
) are made active one after another, and the Nonosu input terminal (DBo
-DB,) By supplying return data, it detects which key has been pressed and transfers the data obtained by scanning to the main body.

12 is a key matrix circuit. The key matrix circuit 12 consists of switches constituting shift keys and function keys in addition to data keys arranged in a matrix, and addresses are assigned to each switch. In the figure, key switch structures arranged at the intersections of the matrix are shown in circles. 13 is a decoder. The decoder 13 receives a key address (SCN) output from the control unit 11.
, ~SCN, ) into one signal and supply it to the key matrix circuit 12. A so-called scan signal is generated and output. The output obtained from the key matrix circuit 12 is supplied to the path input terminals (DB, to γ) of the control unit 11, and is recognized as a so-called return signal.

In the embodiment of the present invention, among the 8-bit ports that the control unit 11 has, 3 bits (PG, PI+P2) are allocated for scanning, and 1 bit (P7) is allocated for mode setting. . That is, bit 7 has
A switch 14 is externally connected, and the operator sets the lockout/rollover mode by turning the switch 14 ON and OFF.

FIG. 2 is a flowchart showing the operation of the embodiment of the present invention.

The operation of the embodiment shown in FIG. 1 will be explained in detail below using the flowchart in FIG. First, control section 1
1 refers to the pit 7 of the built-in port before scanning, recognizes lever rollover mode with @1, and performs a scan with roll auto 4. If it is "O", it recognizes lockout mode. , a lockout scan is performed.The control unit 1 has a built-in switch 14 on the trunk door for mode selection by the operator.
is connected, for example, when switch 14 is turned up, 1
It should be defined so that it becomes 1'' and when pushed down it becomes 0#.

When the lockout mode is recognized, it is first checked to see if any keys are being pressed during scanning. If no other key is pressed, it is determined that one key has been detected during the scan, and the position of this scan line and the position of the return line are coded and stored in a buffer built into the control unit 11. Also, if other keys are detected being pressed during scanning, it is determined that two or more keys have been pressed, and the data is completely ignored without being stored in the above-mentioned 9 files. Furthermore, if two or more keys are pressed, no data will be stored in the above buffer, but if all but one specific key are released, only one key is valid and its position is Information is stored in a buffer. if,
If one key is already pressed and then another key is pressed and the later pressed key is released before the first pressed key is released, the later key is completely ignored. and determines that no key was pressed. When this mode is selected, no matter how many keys are pressed at the same time,
No matter what order the keys are pressed, the power required for each key is 1.
Only the pieces are sent to the buffer.

On the other hand, if rollover mode is recognized, any key is determined independently of all others, as described above. That is,
When one key is pressed, it is checked whether the wait key is still pressed while scanning the keyboard twice. If pressed, the key data is stored in the buffer.

You can press any number of keys, and other keys will be detected/
Stored in JTFA. Even if they are pressed at the same time, they are detected and stored in the buffer in the order in which the keyboard is scanned.

In the figure, the scan counter and buffer are both built into the control unit 11 and are well known in the art, so their explanation will be omitted.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to operate in two modes, lockout/rollover, with one keyboard unit, and it is possible to select a mode that suits the skill of the operator. Furthermore, the present invention can be implemented without requiring any changes to hardware, and contributes to the promotion of keyboard integration and common use.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a flow chart showing the operation of the embodiment of the present invention. 1 No. Control unit (micro f processor), 12...
Key matrix circuit, 13... decoder, 14...
switch.

Claims (1)

[Claims] It has a key matrix circuit in which key switches are arranged in a matrix, and a control section that generates and outputs a scan signal to the key matrix circuit, obtains a return signal, and imports key data. A data bit that defines the mode for data acquisition is assigned to the port with which the controller is connected, and under the specifications of the externally connected switch, the control unit recognizes this and executes a rollover scan or lockout scan. Key scan control method.