JPH0568279A - Digital telephone set - Google Patents

Abstract

PURPOSE:To obtain the digital telephone set in which a switch function is defined flexibly to a mount position of a switch by providing a switch contact means and a control means to the digital telephone set. CONSTITUTION:The telephone set is provided with a control means 112 having plural input output ports and plural switch contact means 100-111 outputting a specific switch code depending on a function of a switch while discriminating the code into a switch depression state and a switch non-depression state. Thus, the switch contact means 100-111 output a code representing a function of the switch and the discrimination of the depression state and the non-depression state of the switch in serial data depending on a read clock outputted to an output port of the control means 112 in this way and the code is identified by an input port of the control means 112. Thus, the digital telephone set able to define the switch function flexibly to the mount position of the switch without software programming is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital telephone accommodated in a private branch exchange as a dedicated telephone.

[0002]

2. Description of the Related Art In recent years, it has become mainstream that a private telephone housed in a private branch exchange can flexibly define a switch function of an operation unit.

Conventionally, this type of digital telephone is shown in FIG.
In general, the switch input control of the operation unit is performed with the configuration shown in FIG.

In FIG. 4, reference numerals 500 to 511 denote switch contact means, and as shown in the drawing, dial keys (1, 2,
..., *, 0, #) functions, and when the switch is pressed, contacts A and B are connected. Reference numeral 512 is a control means for recognizing these switch pressing states, and includes I / O ports 1 to I / O ports 4 which are input ports and I / O ports 5 to I / O ports 7 which are output ports. Prepare 513 is
A resistor for pulling up the I / O port 1 to I / O port 4, and holds a high level when the switch is not pressed.

In order for the control means 512 to detect the switch pressing state, first a low level is output to the I / O port 5,
The states of the switch contact means 500 to 503 are judged by the I / O port 1 to I / O port 4. That is, for example, when only the switch contact means 500 is pressed down, only the I / O port 1 becomes low level. Next, the control means 512
A low level is output to the I / O port 6, and the states of the switch contact means 504 to 507 are judged by the I / O port 1 to I / O port 4. Further, the control means 512 outputs a low level to the I / O port 7, and the switch contact means 508.
The states of ˜511 are determined by the I / O port 1 to I / O port 4. The above processing is repeatedly executed, and the control means 5
Reference numeral 12 detects a switch pressing state.

[0006]

In such a conventional digital telephone, the switches are arranged on a matrix composed of I / O ports 1 to I / O ports 4 and I / O ports 5 to I / O ports 7. Since the function is defined, there is a problem that the program of the control means 512 must be changed when the function of the switch is changed.

The present invention solves the above problems, and an object of the present invention is to provide a digital telephone capable of flexibly defining a switch function with respect to a mounting position of a switch without software programming. ..

[0008]

In order to achieve the above object, the present invention provides a control means having a plurality of input / output ports and a switch code peculiar to a switch pressing state and a non-pressing state depending on the function of the switch. It has the structure provided with the some switch contact means which can output separately.

[0009]

According to the present invention, according to the above-described structure, the switch contact means makes the serial data a code indicating the function of the switch and the switch contact means by the read clock output to the output port of the control means. Is output and is identified by the input port of the control means.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1, 2 and 3 and (Table 1). 1 is a switch configuration diagram of a digital telephone according to an embodiment of the present invention, FIG. 2 is a switch code output timing chart of the telephone, FIG. 3 is a schematic diagram showing a switch layout of the telephone, and (Table 1) is the telephone. It is a switch code table of.

[0011]

[Table 1]

In FIG. 1, reference numeral 100 is a switch contact means, which comprises a switch 100a, a pull-up resistor 100b, and a switch code output section 100c.
Is a switch contact means having the same configuration as 100. The switch function and switch code shown in (Table 1) are given to each switch contact means.

Numeral 112 is a control means for recognizing a switch pressing state of these switch contact means, and I / O ports 5 to I / O ports 7 are used as output ports and I / O ports 1 to I / are used as input ports. It has an O port 4. 113 is a serial output data bus (1) to (4)
A pull-up resistor for holding the I / O ports 1 to 4 at a high level when no data is output from the switch contact means.

A method for the control means 112 to detect the pressed state of the switch will be described. The control means 112 controls the I
The read clock (1) to the read clock (3) shown in FIG. 2 are output to the / O port 5 to the I / O port 7, respectively. On the other hand, the switch contact means 100-1
Reference numeral 03 denotes serial data (S, Q) on the serial output data bus (1) to the serial output data bus (4) in synchronization with the fall of the read clock (1).
3, Q2, Q1, Q0) are output. The control means 112 outputs these serial output data to the I / O ports 1 to I.
/ O port 4 is used to detect the function and the pressed state of the switch according to (Table 1). Similarly, the pressed states of the switches of the switch contact means 104 to 111 are detected.

Assuming that the above switch contact means are laid out as shown in FIG.
Even if the layout is changed as shown in (b), the switch function is assigned to the switch itself, and I / O ports 1 to I / O
Since the function of the switch is not defined on the matrix composed of the O port 4 and the I / O port 5 to I / O port 7, it is not necessary to change the program of the control means 112. Further, there is no problem even if the conventional switches (*, #) are replaced with new switches ($, &) as shown in FIG. This is possible by previously programming the control means 112 with a switch function that can be defined by a combination of all switch code bits.

As described above, according to the digital telephone of the embodiment of the present invention, each switch contact means is composed of a switch, a pull-up resistor and a switch code output section, and each switch is operated by a read clock from the output port of the control means. Since the contact means is configured to distinguish whether the switch is pressed or not and to output serial data indicating the function of the switch, by identifying these data at the input port of the control means, each switch can be operated without changing the program. The function definition of can be changed by replacing the switch.

In the above description, the switch code bit is
Although the case of 4 bits has been described, the number of bits can be increased depending on the type of function.

[0018]

As is apparent from the above embodiments, according to the present invention, a digital telephone capable of flexibly defining the switch function with respect to the mounting position of the switch without software programming is provided. Can be provided.

[Brief description of drawings]

FIG. 1 is a switch configuration diagram of a digital telephone according to an embodiment of the present invention.

[FIG. 2] Switch code output timing chart of the same telephone

FIG. 3 is a schematic diagram showing a switch layout of the telephone.

FIG. 4 is a switch configuration diagram of a conventional digital telephone.

[Explanation of symbols]

 100-111 switch contact means 112 control means

Claims (1)

[Claims] 1. A switch contact means comprising a plurality of bits, comprising a plurality of switch contact means and a control means having a plurality of input / output ports, in synchronization with a read clock signal output to an output port of the control means. Of the function type code bit and a code bit indicating the switch pressing state of the switch contact means are output to the input port of the control means, and the control means identifies the function of the switch contact means and the switch press state. Made digital telephone.