JPS60238925A - Switch inputting circuit - Google Patents

Abstract

PURPOSE:To reduce the number of data inputting circuits and, at the same time, to eliminate the problem of fluctuation of contacts of data setting switches, by inputting an interrupt signal after the data setting switches operate. CONSTITUTION:When, for example, switches SD11 and SI11 are closed, the data setting switch SD11 and interruption switch SI11 operate and an interrupt signal is inputted in a processor 4 from an interruption inputting circuit 2-1, because it is arranged that a multiple selection circuit 5 gives an OV signal to a switch block 1-1 only. In response to the interrupt signal, the processor 4 reads the data of a data inputting circuit 3-1 as the data of the switch block 1-1. In this case, no problem occurs even when the switches SD11 and SI11 fluctuate, because the interrupt signal is inputted at the moment when both the switches SD11 and SI11 are closed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a switch input circuit that is connected to a large number of switches and inputs data set in these switches to a processor or the like.

[Conventional technology]

Conventionally, there has been a circuit of this type as shown in FIG.

In Fig. 1, 1 to 1 to 1-3 are data setting switches 8D1□ to 5D11 m 5D11 to SD, 3°S
Dll ””S Dll + switch S for interrupt input
I 口〜8118e 8Ill〜sI、、I 5I
Switch number block consisting of 11”'8111, 2
-1.2-2.2-:ll is switch 5III ~51
11*8111~5111 H5I11~8I,,
an interrupt input circuit connected to 3-1. a-2, 3-3 are switches SD~8D1g, 8D□~8D1m,
Data input circuit connected to 8Dmt~SD, 4
are processors, and interrupt input circuits 2-1 to 2-3. It is connected to data input circuits 3-1 to 3-3, and reads and controls their data.

Next, the operation will be explained with reference to the waveform diagram in FIG.

Now switch S I)t of switch block 1-1
t is closed as shown in FIG. 2a, the switches S1. , are also closed as shown in FIG. The processor 4 detects the closing of the switch S by the interrupt signal of the interrupt input circuit 2-1, and indicates the corresponding signal of the data input circuit 3-1 (C in FIG. 2) with an arrow. Load at the point indicated.

Since only the switch SD,1 is closed, the data input circuit 3-1 supplies a signal of '100' to the processor 4, and this is read into the processor 4 as the data of the switch block 1-1. It will be done.

There is also a method of omitting the interrupt input circuits 2-1 to 2-3 and constantly scanning the data input circuits 3-1 to 3-3, but it is the same in that a data input circuit is provided for each switch block. be.

FIG. 3 also shows a conventional circuit of this type. In Figure 3,
The data input circuits 3-2 and 3-3 in FIG. 1 are omitted, and the data input circuit 3-1 is connected to each switch block 1-1 to 1-1.
3 same digit switches 8D11 to 5DII + SDl
1 to SD23*SD81 to 8D, . 5 is switch block 1-1.1-2 or 1-3
The circuit is a multiple selection prevention circuit which applies an Ov times signal only to the circuit, and the other parts are the same as those with the same reference numerals in FIG.

To explain the operation, switch 8D11. sI, 1
is closed, the multiple selection prevention circuit 5 gives a 0 signal only to the switch block 1-1, so the processor 4 receives an interrupt signal only from the interrupt input circuit 2-1. be done. In response, processor 4 reads the data from data input circuit 3-1 as data from switch block 1-1.

Since the conventional switch input circuit is configured as described above, it is necessary to provide a data input circuit for each switch block, and if only one data input circuit is provided and shared by each switch block. However, since the corresponding input switch is determined by the combination of the interrupt input switch and the data setting switch, there is a problem of variations in the contact points of the switches.

[Summary of the invention]

This invention was made in order to eliminate the disadvantages of the conventional ones as described above, and by inputting an interrupt signal after the data setting switch is operated, the number of data input circuits can be reduced. It is an object of the present invention to provide a switch input circuit which reduces the amount of noise and also eliminates the problem of variations in the contact points of the switch.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

Components in FIG. 4 are the same as those with the same reference numerals in FIG. 3. The interrupt input circuits 2-1 to 2-3 each have a common interrupt input switch 8Il for each switch block 1-1 to 1-3! ~5Iss, SIgt~8I,,,8I
, 1-8I3. The other end of each of these switches is connected to data setting switches 8D111 to 5D13,
It is connected to the multiple selection prevention circuit 5 via 5D21 to SDo, SDl, to 8Do. Single data input circuit 3
Each input terminal of -1 is connected to each switch block 1-1 to 1-.
3 above switches SD■～～sn, 315D11～8D
2m, connected to 5DII-8Dss.

Next, the operation will be explained. Switch SD now! .

S11. is closed, the multiple selection circuit 5 gives the O■ signal only to the switch block 1-1, so the data setting switch SDI operates,
Interrupt switch SI! , is also operated, an interrupt signal from the interrupt input circuit 2-1 is input to the processor 4. In response, the processor 4 reads all data of the data input circuit 3-1 as data of the switch block 1-1. The processor 4 reads the interrupt signal from the interrupt input circuit 2-1 and the data from the data input circuit 3-1 as data from the switch block 1-1.
Switch SD! , 81. , is determined to have worked.

In this case, even if there is variation in the switches 8D11s 5111, the interrupt signal is input when both are closed, so the variation in the switches does not pose a problem.

〔Effect of the invention〕

As described above, according to the present invention, the number of data input circuits can be reduced by configuring the interrupt signal input circuit to be closed when the contact of the data setting switch is closed. As shown in the figure, there is an effect that a switch input circuit can be obtained in which variation in the switches does not pose a problem and data can be read with less wasted time.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of a conventional switch input circuit, Fig. 2 is a waveform diagram of the circuit shown in Fig. 1, Fig. 3 is a circuit diagram of a conventional switch input circuit, and Fig. 4 is an embodiment of the present invention. A circuit diagram of a switch input circuit according to. 1-1 to 1-3... switch block, 2-1 to 2
-3... Interrupt input circuit, 3-1 to 3-3... Data input circuit, 4... Processor, 5... Multiple selection prevention circuit. In addition, in the figures, the same reference numerals indicate the same parts.

Claims (1)

[Claims] a plurality of switch blocks comprising a plurality of data setting switches connected in parallel and a plurality of interrupt input switches connected in series to the data setting switches and operating in conjunction with the data setting switches; , a single data input circuit connected to the data setting switch of each switch block separately and independently; and a single data input circuit connected to the common interrupt input switch of each switch block and connected to the data setting switch. a plurality of interrupt input circuits into which interrupt signals are input when the interlocked interrupt input switches are operated; and the data setting switch which inputs data in the data input circuit in response to the interrupt signals. A switch input circuit comprising: a processor that reads data of the switch block that has been operated;