JPH0527893A - Input/output control device - Google Patents

Abstract

PURPOSE:To enable the drastic increase of the number of effective input/output terminals in an input/output control device including a PIO (parallel.input.output.interface.controller) and a matrix switch. CONSTITUTION:This device is an input/output control device including a PIO 10 and a matrix switch 13. The terminal part within a first port part 11 in the PIO 10 and the terminal part within a second port part 12 are constituted so that they may be connectable with a desired selection relation in connection point parts SO to S15 within the matrix switch 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an input / output control device, and more particularly to an input / output control device capable of greatly increasing the number of effective input / output terminals.

[0002]

2. Description of the Related Art A parallel input / output interface controller (PIO: Parallel Input / Ou) as a conventional input / output control device.
(put Interface Controller)
Is generally used as a peripheral device for a CPU such as an ordinary microcomputer, and required signals are exchanged in parallel between the CPU and an appropriate external device. Various operating conditions of the PIO are set by predetermined conditioning signals from the CPU, and the PIO is usually provided with two port sections having substantially the same configuration.
One of them is designated as an input port section, and the other is designated as an output port section. By the way, this conventional P
In IO, a plurality of input / output terminals in the port section are individually and independently used. Therefore, when it is necessary to use more input / output terminals than that, it is possible to cope with this. Therefore, it is necessary to prepare two or more PIOs, which eventually leads to an increase in the size of the device and its cost.
There was a difficulty that it was impossible to avoid ups.

[0003]

As described above, in the conventional PIO of this type in the related art, a plurality of input / output terminals in the port section are individually and independently used. When it is necessary to use more input / output terminals than one PIO, it is necessary to prepare a plurality of PIOs, and avoid increasing the size of the final device and increasing its cost. There was a problem that it became impossible.

The present invention has been made to solve the above-mentioned problems, and provides an input / output control device capable of significantly increasing the number of effective input / output terminals with a simple structure. The purpose is that.

[0005]

An input / output control device according to the present invention has been made to achieve the above-mentioned object, and includes a PIO (10 in FIG. 1) and a matrix switch (1).
3) an I / O controller including
The terminal part in the first port part (# 1 port 11) and the terminal part in the second port part (# 2 port 12) in (10) are the contact parts (S) in the matrix switch (13).
0 to S15), the connection is made possible with a desired selection relationship.

[0006]

According to the present invention, the terminal portion (eg, # 1 port 11) in the first port portion (# 1 port 11) of the PIO (10) (for example,
The input terminals 1, 2, 3, 4) and the terminal portion (for example, the output terminals A, B, C, D) in the second port portion (# 2 port 12), With a desired selection relationship (for example, a connection relationship in which the input terminal 3 and the output terminal A are connected by turning on the contact part S2) in the contact parts (S0 to S15) in the matrix switch (13) Made connectable. For this, PI
The number of effective input / output terminals can be increased as necessary without increasing the actual number of O.

[0007]

1 is a schematic block diagram showing an input / output control device according to an embodiment of the present invention. In FIG. 1, 10
Is a normal PIO, for example, four input terminals (1,
2, 3, 4) and a # 2 port 12 having, for example, four output terminals (A, B, C, D). 13 is a matrix switch, #
Input terminals (1, 2, 3, 4) in 1 port 11,
The output terminals (A, B, C, D) of the # 2 port 12 are individually connected. S0 to S15 are contact parts included in the matrix switch 13, respectively. For example, when the contact part S2 is turned on, the input terminal 3 and the output terminal A are connected. Reference numerals 14 to 17 denote backflow prevention diodes provided on the output terminal (A, B, C, D) side of the # 2 port 12, respectively, which will be described later.

FIG. 2 is a diagram showing a specific configuration of the above embodiment. In FIG. 2, 20 to 24 are signal input sections from an external device (not shown), 20 of which is a common signal input section and 21 to 24 are individual signal input sections. Here, focusing on the first signal input section including the common signal input section 20 and the individual signal input section 21, the current limiting resistor R1 and the noise cut capacitance C1 in series with the current limiting resistor R1 are the common signal input section 20. And the individual signal input section 21, and the bypass diode D1 and the light emitting section of the photocoupler P1 are respectively provided in parallel to the noise cut capacitance C1. Here, the current limiting resistor R1 and the noise cut capacitor C1 also operate to set a predetermined time constant based on their respective values. Also,
The light receiving portion of the photocoupler P1 has a backflow prevention diode 14
Output terminal A in the # 2 port 12 of the PIO
(Or B, C, D) and the input terminal 1 of the # 1 port 11 are connected to the first input / output terminal section.
Here, the bypass diode D1 bypasses the light emitting portion of the photocoupler P1 so as not to flow when an error signal that flows in the direction opposite to the original input signal is mixed, and also serves to prevent backflow. Diode 14
Is for preventing an error signal flowing in a direction opposite to the original signal from flowing through the light receiving portion of the photocoupler P1. Since the second to fourth signal input sections including the common signal input section 20 and the individual signal input sections 22 to 24 and the related parts thereof have the same configurations as those in the above-mentioned case, the description thereof will be omitted. Omit it.

FIG. 3 is a diagram showing a specific application example of the above embodiment. In FIG. 3, reference numeral 31 is an input means such as a keyboard or a touch panel, and in this example, 16 kinds of functions can be designated. Further, reference numeral 32 is a CPU as a data processing means such as a microcomputer, which is designed to perform required data processing based on an instruction designated by the input means 31. Now, assuming that a touch panel is prepared as the input means 31, it is assumed that the panel in the hatched portion is touched with a finger or the like. At this time,
Only the touched part emits light to identify the part, and the contact portion S2 (see FIG. 1) of the matrix switch 13 corresponding to this part is turned on. Then, an instruction corresponding to the selection of this part is issued by the CPU 3
2 and the predetermined function is performed in the CPU 32. Here, with reference to FIG. 2 again, the above-described operation in the third signal input section including the common signal input section 20 and the individual signal input section 23 and a portion related thereto will be described. By selecting the required part of the touch panel 31 as described above, a predetermined signal current flows between the common signal input section 20 and the individual signal input section 23 in FIG. The optical signal from the light emitting portion of P3 is received by the corresponding light receiving portion. Based on this received light, the # in PIO 10 (FIG. 1)
The input terminal 3 of the 1-port 11 and the output terminal A of the # 2 port 12 are connected, and the function corresponding to this connection is the CPU 32.
(Fig. 3). As can be understood from the above description, according to the embodiment of the present invention,
The number of effective input / output terminals can be significantly increased by simply providing a conventional PIO with a simple means such as a matrix switch. It is also possible to appropriately amplify the optical signal from the light emitting portion of the photocoupler (for example, P3) as described above to cause the corresponding selected portion of the touch panel 31 to emit light. Then, by utilizing such a light emitting phenomenon, the corresponding portion of the touch panel as the input means is illuminated, and the position thereof can be confirmed.

[0010]

As described above, the input / output control device according to the present invention includes the PIO 10 and the matrix switch 13 and is a terminal in the first port section (# 1 port 11) of the PIO 10. Section and the second port section (#
The terminal portion in the 2 port 12) is connectable at the contact portions S0 to S15 in the matrix switch 13 with a desired selection relationship. Further, according to the input / output control device of the present invention described above, by simply providing a matrix switch having a simple structure in the conventional PIO, the size of the final device is increased and the cost thereof is reduced.
It is possible to significantly increase the number of effective input / output terminals without increasing the number.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an input / output control device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a specific configuration of the above embodiment.

FIG. 3 is a diagram showing a specific application example of the above embodiment.

[Explanation of symbols]

 10: PIO 11: # 1 port 12: # 2 port 13: Matrix switch S0 to S15: Contact part 14 to 17: Backflow prevention diode

Claims (1)

Claims: 1. A parallel input / output interface controller (PIO) and a matrix.
An input / output control device including a switch, wherein a terminal portion in the first port portion and a terminal portion in the second port portion of the PIO have a desired selection relationship at a contact portion in the matrix switch. An input / output control device characterized in that it can be connected with.