JPS60229523A - Input information holding circuit - Google Patents

Abstract

PURPOSE:To decrease the number of wires of gate input terminals by arranging NAND gates dispersedly at an input and an output side. CONSTITUTION:The NAND gates 16-19 form RS type FFs 13 and 14, whose outputs -Q1 and -Q2 are connected to a binary input terminal of an MPX29. A table 1 shows which of outputs Q1 and Q2 and output terminals 9, 10, 11, and 12 are at a level L when switches (SW)1, 2, 3, or 4 is pressed. For example, when the SW1 is pressed, the -Q1 and -Q2 are at L and the Q1 and Q2 are at H, which is held. Thus, when one of the SWs is pressed, binary data indicating which SW is pressed appear at the outputs Q1 and Q2, or -Q1 and -Q2. Consequently, one of outputs of gates 20-23 goes down to L corresponding to the pressed SW as shown in the table. For example, when the SW1 is pressed, only a light emitting diode 9 turns on. Then, the outputs of the gates 17 and 19 are applied to the MPX29, one of input terminals 24-27 is connected to an output terminal 28 corresponding to the SW.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a human-powered information holding circuit that generates an output signal only at a desired output terminal among a plurality of output terminals.

As an example of a conventional setting switch circuit for outputs other than those selected on IJ, the RS shown in FIG.
It is known that flip 70 knobs 5.6.7 and 8 are used, one for each output. and 8 are connected to the reset terminals of 7" and 8, and are also connected to the set terminals of the other 7 lip-flops, so a low-level output signal is generated only at the output of the pressed switch among these bushings. , the others remain at high level, and only the corresponding one of the generating diodes 9, 10, 11 or 1d12 lights up.

However, as mentioned above, each input terminal has -i1 and 4
Since it is connected to two flip-flops, the connection on the A-child side becomes overcrowded and complicated.

The present invention has been made to overcome all of the above-mentioned drawbacks, and its purpose is to reduce the number of connection wires for the gate input terminal (input 1'?). The information holding circuit is fully provided.

FIG. 2 is a circuit diagram showing one aspect of the present invention.

In FIG. 2, Nant gates 16-19 form RS flip-flops 13 and 14. Ql, Q.

Q, and let's cheer! That's the output of Nantes Gate 16, 17, 18, and 19. Q, Q, Q, and Q should each have opposite phase outputs. The outputs of the Nant gates 20 to 23 are connected to the power supply 7B via light emitting diodes 9 to 12.
The ``lzo outputs Q0 and Q0 may be connected to the binary input terminals of the multiplexer 29. The multiplexer 29 has input terminals 2
It has 4 to 27 and 28 output terminals.

Based on the above, all Z operations will be explained below. Table 0 shows the level of outputs Q1 and Q, and output terminals 9.10.11 and This indicates which of the 12 is at the L level.4 As an example, when pushbutton switch 1 is pressed, Ql and Q,
becomes L, Ql and Q become H, and hold this. In the same way, if you meet 2 bush switches. 1 and Q, Vi
L, and Ql and Q become I]. Do the same for Punyu switches 3 and 4 as shown in the table. As mentioned above, any of Bush Switches 1, 2, 3 and 4 '5
j・isuto, Nantes Gate 16.18 and #i17.1
Binary data indicating which of the bushing switches 1 to 4 is at the physical pressure Jlk appears in the IH forces Q0, Q and the straddle ζn 1, Q2 of 9. As a result, as shown in the table below, in response to the suppression of any one of the bushing switches 1, 2, 3 and 4, one of the outputs of the Nant gates 2, 1, 2 and 23 goes to L level.゜Therefore, for example, only the push button of the button switch 1 and the light emitting diode 9 will light up. Next, when you press the Punyu switch 2' (l), only the light emitting diode 1o lights up, and the light emitting diode 9 turns off.
Also, the multiplexer 29 selects one of the mantissa input signals applied to the input terminals of the machine, which is inputted by the binary input, and outputs 4 output signals. There are well-known indigenous societies. The outputs of gates 17 and 19 are therefore added to multiplexer 29 (tt4) and one of the input terminals 24, 25, 26 and 27 corresponding to bush switches 1, 2, 3 and 4 respectively It is not connected to output terminal 28.

In Figure 3, any of the eight input terminals 31 to 38 are temporarily grounded, and the corresponding output terminals 56 to 63 are grounded to the ground level. 39-44 F) RS flip-flop circuits 45, 46 and 47 are formed, and their outputs are decoded by Nant gates 48-55. Input terminals 31-3
The binary output indicating which of the terminals 8 is grounded is given as parallel data from the RS flip 70 knobs 45, 46 and 47, and is derived from the Nant gates 40, 42 and 44 to the output terminals 6TO, 6TO and 66, for example. As described above, according to the present invention, all the signals are derived and held only at the output terminal corresponding to the input terminal selected as 2. Since it is possible to use Z, it is possible to obtain excellent effects such as preventing the wiring from becoming crowded.

[Brief explanation of drawings]

Fig. 1 shows a diagram of a conventional circuit, and Fig. 2 shows a diagram of a conventional circuit.
016-23, 39-44, 48-56-.Nant Gate, 9-12, etc. Light-emitting diodes.

Claims (1)

[Claims] For a plurality of RSS flip-flop circuits, only one of the set terminals and reset terminals of each of the plurality of interconnection points connected to each other is selected as an input terminal, and for each of the above-mentioned RS flip-flop circuits, each output and Is it possible to select only one of the negative phase functions and obtain several types of AND circuits? r: By providing 4, 1'! is applied to only the corresponding AND circuit among the plurality of AND circuits according to the input information temporarily applied to any of the input terminals. Get special output z4:? A human-powered information holding circuit.