JPH0276419A - Key input system - Google Patents

Abstract

PURPOSE:To omit the input of key block information by an operator by dividing the number of key contacts into blocks corresponding to the number of input sorts. CONSTITUTION:When one of contacts on the 1st key matrix 3 is depressed, one of connected scanning lines (e) and one of return lines f1 are activated and a key scanning part 2 generates a key code (d) corresponding to the pair of the active scanning line and return line and transfers the key code (d) to a central control part 1. At that time, a key block register part 5 generates key block data (h) on the basis of the line f1 and transfers the data (h) to the control part 1. Consequently, the control part 1 can confirm which key out of keys on the key matrixes 3, 4 is depressed. Thus, a key and a key input sort can be allowed to correspond to each other at the rate of 1 to 1, so that it is unnecessary for the operator to input key block information.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a key input system, and particularly to a key input system including a plurality of blocks each consisting of a key matrix.

[Conventional technology]

A block diagram of a conventional key input system is shown in FIG.

In the conventional key input system, when one key on the key matrix 13 is pressed, the scan line S and return line t corresponding to this key become active, and the key scanning unit 12 generates key codes corresponding to these two lines. This key code was passed to the central control unit 11.

When one type of many input keys is required, the central control section 11 recognizes which block of keys has been input based on the signal output from the encode section 15 when the switch section 14 is operated.

[Problem to be solved by the invention]

In the above-mentioned conventional key input system, key block information is changed by a switch, so there is a drawback that the operator has to change the switch every time the key block is changed.

[Means to solve the problem]

The key input system of the present invention includes a plurality of key matrices and a key block register unit that outputs key block data indicating the key matrix corresponding to the activated return line connected from the key matrices. and a key scanning unit that outputs a key code from an active one of a plurality of scan lines connected to the key matrix and sequentially activated and an active one of the return line. configured.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention. The scan line e from the key scanning section 2 is connected to the first and second key matrices 3.4,
Return line f1. from key matrix 3.4. f
2 are both connected to the key block register section 5. Further, a composite return line g (g=ftΔfz>) which is a composite of the return lines f, , f2 is connected from the key block register section 5 to the key scanning section 2.

The key block register section 5 has a return line f1. f
2 are each provided with a register storing key block data. The key scanning unit 2 activates each line of the scan line e in a time-division manner.

Next, the operation when one contact on the first key matrix 3 is pressed will be explained. When one contact on the key matrix 3 is pressed, one of the scan lines e and one of the return lines f1 connected to this contact become active.
The key scanning unit 2 reads the key code d corresponding to this active pair of scan line and return line.
The receiver then passes this key code d to the central control unit 1. At this time, the key block register section 5 stores the key block data h based on the activated return line f1.
This data h is then passed to the central control unit 1.

In this way, the central control unit 1 recognizes which key in the key matrix 3.4 has been pressed.

FIG. 3 is a block diagram of another embodiment of the invention. A plurality of key matrices n1 to n4 are provided corresponding to the plurality of displays m1 to m4, a scan line i is connected from the key scanning section 23 to the key matrices n1 to n4, and a return line j is connected from the key matrix nl-'-n4. is connected to the key block register section 24, and a composite return line l is connected from the key block register section 24 to the central control section 21. A key code k is transmitted from the central control unit 21 to the scanning unit 23,
Key block data l from the key block register section 24
can be conveyed. A signal is sent from the central control section 21 to the display control section 22, and the display control section 22 controls the displays m, to m4. When used in a system in which a plurality of keyboards are controlled by one central control unit as in the embodiment shown in FIG. 3, it is possible to construct a system with high H/W efficiency. - [Effects of the Invention] As explained above, the present invention connects a key block register that generates key block data to the return line of the keyboard input circuit, and divides the number of key contacts into blocks according to the number of key input types. This has the effect of allowing a one-to-one correspondence between keys and key input types, and eliminates the need for the operator to input key block information. Also,
When developing a multi-item key input device based on a device with a standard number of key inputs, there is an advantage that the basic key scanning section can be used as is.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of one embodiment of the present invention, FIG. 2 is a block diagram of a conventional key input system, and FIG. 3 is a block diagram of another embodiment of the present invention. 1.11.21...Central control unit, 2,12.23...
・Key scanning section, 3, 4, 13. nl to n4...
・Key matrix, 5, 24...Keep register section, 15...Encoding section, 14...Switch section, 6. s, i...scan line, fl+f2. t,
j...Return line, g+1...Synthetic return line.

Claims (1)

[Claims] A plurality of key matrices, a key block register section that outputs key block data indicating the key matrix corresponding to the activated return line connected from the key matrices, and a key block register section connected to the key matrix. A key input system comprising: a key scanning unit that outputs a key code from an active one of a plurality of sequentially activated scan lines and an active one of the return lines.