JPH01254997A - Display device - Google Patents

Abstract

PURPOSE:To enable easily visible display of an I/O state and to deal with even the momentarily changing signals by providing a discriminating means which discriminates the presence or absence of the signals in respective ports and a means for lighting at the point of the time of I/O state display which controls lighting in accordance with the respective output signals from the discriminating means. CONSTITUTION:The presence or absence of the signals in the respective ports 21a-21d, 22a-22d is discriminated by the discriminating means 27 and further, the lighting of a display means 24 is controlled in accordance with the respective output signals from a segment assigning means 26 and the discriminating means 27 by the means 28 for lighting at the time of the I/O state display. Namely, the input 0 pressure of an A/D converting means 23 is normally displayed on the display means by a means 25 for lighting at the normal time. On the other hand, the presence or absence of the signals in the respective ports is discriminated and the lighting of the display means is controlled in accordance with the respective output signals from the segment assigning means and the discriminating means at the time of the I/O state display. The easy checking of even the momentarily changing signals is thereby enabled.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a display device that displays the input/output status of a device equipped with a CPU, and in particular, a display device that displays the input/output status of a device equipped with a CPU, and in particular, a display device that displays the input/output status of a device equipped with a CPU, and in particular, a display device that displays the input/output status of a device equipped with a CPU, and in particular, a display device that displays the input/output status of a device equipped with a CPU, and in particular, a display device that displays the input/output status of a device equipped with a CPU. This invention relates to a display device using seven segment LEDs.

(Prior Art) Fig. 3 shows a conventional display device, in which (1) indicates four input ports (la), (lb), (1c), (l).
d), (2) is an input circuit that receives the input signal, (3) is an A/D converter that converts the analog signal to a digital signal, and (4) processes the input signal to create an output signal. Crt], (5) is a memory in which the program is stored, (6) is an output circuit for outputting an output signal,
(7) is a display that displays the state of human output, and as shown in Fig. 4, there are seven segments (7a) arranged in a figure 8 shape.
(7b), (7c), (7d), (7e), (7f),
(7g) and (71), (7j), (7k), (71
), (7m), (7n), (7o) and one dp
Two 7-segment LEs consisting of (7h) and (7p)
It is formed by D. (8) has four output ports (8a
), (8b), (8c), and (8d).

A conventional display device is configured as described above, and includes a display device (7).
normally displays the input voltage of the A/D converter (3), and when displaying the I/O status, each port (1a) of each terminal (1), (8)
, (1b), (lc), (ld), (8a), (8
b) Display the presence or absence of signals in (8c) and (8d).

That is, normally, the signal input from the input terminal (1) is sent to the CPU (4) via the input circuit (2), and the output of the A/D converter (3) is also sent to the CPU (4). It will be done. The input data is then processed by the CPU (4), and the output data is output to the output terminal (8) via the output circuit (6).
The input voltage of the A/D converter (3) is displayed.

On the other hand, when a signal is manually input from the input terminal (1) when displaying the I/O status, this input signal is sent to the CPU (4) via the input circuit (2) in step (11) in FIG. In step (12), the output of the A/D converter (3) is sent to the CPU (4). And step (13
), these input data are processed by the CPU (4), and the processing results are output to the output terminal (8) via the output circuit (6) in step (14).

Next, in step (15), the input data of the input terminal (1) is converted into hexadecimal, and in step (16
), the input data converted into hexadecimal numbers is encoded into LEDs. For example, input port (Ia) of input terminal (1)
, (ib), this data is (1/
O0)2, so converting this to hexadecimal gives (C),
,bawl. In order to display this (C) and 6 so that they appear as °C'' using a 7-segment LED, the segments (71), (7m), and (7n) of the display (7) shown in FIG.
), (71) must be turned on, and this process is performed in step (16).

Next, in step (17), the output data of the output terminal (8) is converted into hexadecimal, and in step (18)
), the hexadecimal output data is encoded into an LED, and in step (19), the LED is turned on and displayed on the display (7).

[Problems to be Solved by the Invention] In the conventional display device as described above, the I/O status is displayed in hexadecimal, so the input/output terminals (1), (8)
) which ports (la), (lb), (lc),
(ld), (8a), (8b), (8c), (8d
), it is necessary to convert hexadecimal numbers to binary numbers, and there is also the problem that signals that change instantaneously are very difficult to see.

Therefore, in some cases, as shown in FIG. 6, the LED lighting circuit (9) and each port (1a), (1
b), (IC), (1d), (8a), (8b), (
8c) A display (/O) consisting of eight LEDs corresponding to (ad) is added, and the I/O status is displayed on this display (/O), and the display (A) is /
A device in which only the input voltage of the D converter (3) is displayed has been proposed.

However, this method has problems such as a complicated circuit configuration of the display device and high cost.

This invention was made to solve this problem, and it is possible to display the I/O status in an easy-to-read manner without adding a special /O status display circuit, and it can change instantaneously. A display device according to the present invention has an input terminal means having a plurality of input ports, and a plurality of output ports. and an A/D converting the analog signal into a digital signal.
a conversion means, a display means consisting of a 7-segment LED,
Normal lighting means for displaying the input terminals of the A/D conversion means on the display means during normal times; and lighting means for displaying the input terminals of the A/D conversion means on the display means; segment allocation means associated with each other; a determination means for determining the presence or absence of a signal at each port when displaying the I/O status; and lighting control of the display means based on each output signal from the segment allocation means and the determination means. A lighting means is provided for displaying the I/O status.

(Function) In the present invention, in normal times, the input terminal of the ^/D conversion means is displayed on the display means consisting of a 7-segment LED by the normal lighting means. On the other hand, when displaying the I/O status, each port of each input/output terminal is associated with one segment of the display means by the segment allocation means, and the presence or absence of a signal at each port is determined by the determination means. The I/O status display lighting means controls the lighting of the display means based on each output signal from the segment allocation means and the determination means.

Therefore, it is possible to display the I/O status in an easy-to-read manner without requiring a special I/O status display circuit.

〔Example〕

FIG. 1 is an overall configuration diagram showing an embodiment of a display device according to the present invention. As is clear from FIG. 1, this embodiment has a plurality of input ports, e.g.
Input terminal means (21) having (21a), (21b), (21c), (21d), a plurality of output ports, for example four output ports (22a), (22b), (22c);
), (22d), and an A/D conversion means (22) for converting an analog signal into a digital signal.
3), and a display means (2) consisting of a 7-segment LED.
4), and during normal times, the normal lighting means (2) are provided respectively.
5) displays the input voltage of the A/D conversion means (23) on the display means (24), and when displaying the I/O status, each port (21a) of the terminal means (21) and (22)
, (21b), (21c), (21d), (22a)
, (22b), (22c), and (22d) are respectively made to correspond to one segment of the display means (24) by the segment allocation means (26), and the discriminating means (
27), each of the above ports (21a), (21b), (
21c), (21d), (22a), (22b), (
22c) and (22d), and the I/O status display lighting means (28) displays the display means based on each output signal from the segment allocation means (26) and the determination means (27). (24) is configured to control lighting.

Note that the circuit configuration of the display device according to this embodiment is the same as that of the conventional display device shown in FIG.

Next, the operation of the above embodiment will be explained with reference to FIG. FIG. 4 is a flow chart of a program for displaying the I/O status stored in the memory (5) of the CPU (4).

First, in normal times, as in the past, when a signal is input from the input terminal (1), it passes through the input circuit (2) to the CPU (4).
), and the output of the A/D converter (3) is also sent to this CPU (4). These input data are processed in the CPLI (4) and output to the output terminal (8) via the output data output circuit (6).

At this time, the input voltage of the A/D converter (3) is displayed on the display (7).

Next, the case of displaying the 1/O state will be explained. First, when a signal is input from the input terminal (1), a human input signal is sent to the CPU (4) via the input circuit (2) in step (31) of FIG.
The output of the A/D converter (3) is sent to the CPU (4). Then, in step (33), the above input data is
Processed in PU (4), the processing result, step (3)
4), the signal is output to the output terminal (8) via the output circuit (6).

Next, in steps (35) to (50), the I/O status is displayed on the display (7). Before that, please check the input/output terminals (
1), (8) ports (la), (lb), (IC)
, (1d), (8a), (Bb), (8c),
It is necessary to decide in advance whether (8d) corresponds to the display (7) (D do (D se'jme', tto (7a) to (7g), (71) to (70)). In this example, input port (1a) is connected to segment (7f), input port (1b
) to segment (7b), the input port (IC) to segment (7n), and the input port (ld) to segment (7n).
7j) respectively, output port (8a) to segment (7e), output port (8b) to segment (7C), and output port (8C) to segment (7m
), the output port (8d) is made to correspond to the segment (7k), respectively. That is, two 7-segment L
The upper four longitudinal segments of the ED (7f), (7b
), (7n), and (7j) correspond to the input terminal (1), and the lower four vertical segments (7e) and (7c
), (7m), and (7k) correspond to the output terminal (8).

With this correspondence, first step (35)
The presence or absence of a signal at the input port (1a) of the input terminal (1) is determined in step (36), and the segment (7b
), and if there is no signal, step (37)
The presence or absence of a signal at the next input port (lb) is determined. Thereafter, similar operations are performed in steps (38) to (42), and if there is a signal, each segment (7b), (7n
), (7j) are lit. In addition, each output port (8a), (8b), (8c), (8d) of the output terminal (8)
), perform the same operations in steps (43) to (50), and if there is a signal, each segment (7e), (7
c) Turn on , (7m) and (7k).

Therefore, each baud) - (la), (xb), (tc)
, (1d), (8a), (8b), (8C), (8d)
and each segment (7f), (7b), (7n), (month)
, (7e), (7C), (7m), and (7k), the I/O status can be easily confirmed from the display contents of the display (7). .

In the above embodiment, the input/output terminals (1) and (8) are respectively four ports (1a), (lb), (lc), and (
ld), (8a), (8b), (8c), and (8d), but there is no limit to the number. For example, if the number of ports is 8, 4 7-segment LE
A similar display can be made by using D.

〔Effect of the invention〕

As explained above, this invention associates each port of the input/output terminal means with each segment of the display means, and when a signal is present at a predetermined port during I/O status display, the corresponding segment is lit. This eliminates the need to add a special I/O status display circuit, and
The O state can be displayed in an easy-to-see manner, and even instantaneously changing signals can be easily confirmed.

[Brief explanation of the drawing]

Fig. 1 is an overall configuration diagram of a display device showing an embodiment of the present invention, Fig. 2 is a flowchart showing its operation, Fig. 3 is a circuit diagram showing a conventional display device, and Fig. 4 is a diagram of the display device. FIG. 5 is a flowchart showing the operation of the conventional device, and FIG. 6 is a circuit diagram showing the conventional display device to which a special I/O status display circuit is added. (21)...Input terminal means, (21a), (21b), (21c), (21d)"
``Input port, (22)...output terminal means, (22a), (22b), (22c), (22d)
... Output port, (23) ... A/D conversion means, (24) ... Display means, (25) ... Normal lighting means, (26) ... Segment allocation means, (27 )...
Discrimination means, (28)... I/O status display lighting means. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] An input terminal means having a plurality of input ports, an output terminal means having a plurality of output ports, an A/D conversion means for converting an analog signal into a digital signal, and a 7-segment L
display means consisting of an ED; normal lighting means for displaying the input voltage of the A/D conversion means on the display means during normal times; segment allocation means each corresponding to one segment of the means; and determining means for determining the presence or absence of a signal at each port when displaying the I/O status;
A display device comprising: I/O status indicator lighting means for controlling lighting of the display means based on each output signal from the segment allocation means and the discrimination means.