JP2003069673A - Control circuit for digital telephone set with display unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the control circuit of a digital telephone set with display unit, where a change to the machine type specification of a high performance is easily implemented and cost can be reduced, by installing a sub CPU which exclusively controls a display unit for a main CPU for receiving control data and for outputting various control signals and by simultaneously inputting control data to the main CPU and the sub CPU. SOLUTION: The telephone set is provided with the main CPU 25 connected to the ping-pong transmission part 23 of the digital telephone set 20 which inputs/outputs control data through transmission SIO 24, and the sub CPU 32 for inputting and decoding control data outputted from the ping-pong transmission part 23 and controlling an LCD display part 30. Control data inputted to the ping-pong transmission part 23 is directly inputted to the main CPU 25 connected through transmission SIO 24 and the sub CPU 32 for inputting and decoding control data and for controlling the display of the LCD display part 30 through a data receiving part 40.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control circuit of a digital telephone with a display connected to a key telephone and a digital exchange such as a private branch exchange (PBX).

[0002]

2. Description of the Related Art Conventionally, in a dedicated digital telephone in a key telephone system, a private branch exchange, etc., two channels of voice data (2.Bch) and one channel of control data (1.Dch) are multiplexed to form a main unit. (Exchange device)
It is configured to be connected and controlled with. In this case, the state of the telephone is all controlled by the main unit,
The control data (Dch) is also used for displaying the lamp on the telephone and displaying characters on the LCD (liquid crystal display). Further, the dedicated digital telephone receives control data (Dch) from the main device, displays the contents instructed by the control data, blinks the lamp, and sets the state of the communication circuit.

However, in the control circuit of the conventional digital telephone with a display, when the control data is received from the main unit, the control data is decoded by one CPU,
The output required for the control contents is output to each block in the telephone,
For example, it is configured to output to an LED (light emitting diode) display unit, an LCD (liquid crystal display) display unit, a call circuit, and the like.

FIG. 3 shows an example of the configuration of a control circuit of such a conventional digital telephone with a display. That is, in FIG. 3, reference numeral 10 indicates a main device, which is composed of a terminal control unit 12 that accommodates a public line network and a ping-pong transmission unit 14. Further, reference numeral 20
Shows a digital telephone equipped with the ping-pong transmission section 14 of the main device 10 and the ping-pong transmission section 23 for mutually performing (2B + D) channel data transmission via a required transmission path.

The digital telephone 20 includes a ping-pong transmission section 23, a transmission SIO (Serial I / O) 24 for input / output transmission of control data (Dch), and a main CPU 2.
5 and ASIC (Application Specified I)
C) 22 is provided. A call circuit 26 for transmitting voice data (Bch) is connected to the ping-pong transmitter 23, and the call circuit 26 is connected to a handset 27a, a speaker 27b, and a microphone 27c, respectively. And the main C of the ASIC 22
The PU 25 is controllably connected to a key matrix unit 28 that operates by button operation and an LED display unit 29, and is also controllably connected to the call circuit 26.

However, the main CPU 25 is provided with a sub CPU 32 for controlling the LCD display section 30 by inputting the LCD display data output based on the input control data (Dch). That is,
The sub CPU 32 is an LCD output control unit 3 for inputting LCD display data output from the main CPU 25.
3, ROM 34, character ROM 35, RAM
And 36.

In the conventional digital telephone 20 with a display having the above-mentioned structure, when the data from the main unit 10 is received, the received control data is transferred to the ASIC 2
The second main CPU 25 decodes and outputs the output necessary for the control content to the LCD output control unit 33 and the like. Therefore, according to such a circuit configuration, the main CP is changed every time the specifications of the digital telephone 20 greatly differ.
Requires U25 software changes. In addition, in order to reduce the cost of the digital telephone 20 today, the main CPU 25 is rarely present as a single unit, and includes a peripheral transmission unit including a ping-pong transmission unit 23 and a transmission SIO 24 as illustrated. ASIC
22. Therefore, in this type of digital telephone 20, a dedicated AS for each model having a different function.
The IC 22 is required, so that the development cost for this is significantly increased.

[0008]

However, the digital telephone 20 of this type is generally lined up from a low-function model with price priority to a high-function model with emphasis on function. However, as described above, when developing a dedicated ASIC (Application Specified IC) 22, in order to avoid increasing the number of masks (printed circuits), one mask should be set to support all functions. However, I /
If the number of O pins is increased too much, it becomes an expensive component. Therefore, when the function of the digital telephone 20 is improved, it is necessary to separate the mask at any suitable place.

For example, if there is a difference in telephone specifications between a model having a 10-button function key and a model having a 20-button function key, by assembling the control unit with the 20-button specification, both functions can be achieved. Creating the included software is easy. However, L
Since the hardware of the LCD display unit is remarkably different between the model having a CD display unit of 2 lines and 24 characters specification and the model of 8 lines and 24 characters specification, interface specifications often differ from each other. Therefore, the software of the main CPU 25 has to be created individually. In such a case, the ASI
It also becomes difficult to unify the hardware configuration of the C22. Further, even if they can be unified, there is a problem that not only the scale is too large as compared with the dedicated ASIC 22 having the low-performance 2-line 24 character specification, but also the dedicated ASIC 22 needs to be developed. .

Therefore, as a result of intensive studies and studies, the present inventor has found that in a digital telephone with a display equipped with an ASIC that receives and decodes control data input from the main device, the main CPU provided in the ASIC Apart from A
By providing a sub CPU having a display control unit that directly receives and decodes (decodes) control data from the ping-pong transmission unit provided in the SIC, the ASIC can be developed according to a low-priced function. , The sub-CP
In the case of a high-performance model specification by having a function configuration for controlling the display unit in U exclusively,
It is possible to easily realize high functionality in the sub CPU while keeping the SIC as it is, and it is possible to easily achieve reduction in labor and cost required for development of high functionality of this type of digital telephone with a display device. I found it.

In this case, in the main CPU,
For example, it is set to perform lamp lighting / extinguishing control output, call circuit state control output, LCD display control output, button press / handset up / down detection, and information output from the telephone side to the main device, and the sub CPU The control data from the device side is transferred to the main C
By receiving in parallel with the PU and setting the LCD display output according to the control code of the control data,
For example, it is possible to easily change the specification of 8 lines and 24 characters to a higher function at a low cost by simply changing the design of the one-chip microcomputer.

Therefore, an object of the present invention is to provide a sub CPU for exclusive control of a display unit to a main CPU configured to receive control data and output various control signals, and to output the control data. To provide a control circuit of a digital telephone with a display capable of easily and easily changing to a high-performance model specification by simultaneously inputting to a main CPU and a sub CPU, and at a low cost. It is in.

[0013]

In order to achieve the above object, the control circuit of a digital telephone with a display according to the present invention is connected so as to exchange voice data and control data with a main unit via a ping-pong transmission section. A main CPU, which is composed of the arranged digital telephones, is connected to the ping-pong transmission section on the digital telephone side via a transmission SIO for inputting / outputting control data, and the control data output from the ping-pong transmission section is input. In a control circuit of a digital telephone with a display, which is provided with a sub CPU configured to decode and control the display, and which is provided with a call circuit for inputting and outputting voice data to and from the ping-pong transmission section. , The control data input to the ping-pong transmission unit and the control data simultaneously with the main CPU connected via the transmission SIO. Force is characterized by being configured to enter directly through the data reception unit against decrypted by sub CPU for controlling the display of the display unit.

The main CPU should be set so as to perform lamp lighting / extinguishing control output, call circuit state control output, LCD display control output, button push down and handset up / down detection, and information output from the telephone side to the main unit. You can

Further, the sub CPU can be set so as to receive control data from the main device side in parallel with the main CPU and perform LCD display output corresponding to the control code of the control data. .

Further, the control data may be input from the main CPU to the sub CPU via SIO.

A main CPU connected to the ping-pong transmission unit via SIO for inputting / outputting control data.
And can be configured as one ASIC.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a control circuit of a digital telephone with a display according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a circuit diagram showing an embodiment of a control circuit of a digital telephone with a display according to the present invention.
For convenience of explanation, the same components as those of the control circuit of the conventional digital telephone with a display shown in FIG. 3 are designated by the same reference numerals, and detailed description thereof will be omitted.

In the control circuit of the display-equipped digital telephone according to the present embodiment, as in the above-mentioned prior art,
A ping-pong transmission unit 14 of the main device 10 including a terminal control unit 12 that accommodates a public line network and a ping-pong transmission unit 14 and a ping-pong that mutually performs (2B + D) channel data transmission via a required transmission path. The digital telephone 20 is provided with a transmission unit 23.

The digital telephone 20 includes the ping-pong transmission section 23, a transmission SIO (Serial I / O) 24 for inputting / outputting control data (Dch), and a main CPU 2.
5 and ASIC (Application Specified I)
C) 22 is provided. A call circuit 26 for transmitting voice data (Bch) is connected to the ping-pong transmitter 23, and the call circuit 26 is connected to a handset 27a, a speaker 27b, and a microphone 27c, respectively. Further, the main C of the ASIC 22
The PU 25 is controllably connected to a key matrix unit 28 that operates by button operation and an LED display unit 29, and is also controllably connected to the call circuit 26. A sub CPU 32 that controls the LCD display unit 30 is provided. The above configuration is basically the same as the control circuit of the conventional digital telephone with a display described above.

However, in the control circuit of the display-equipped digital telephone of this embodiment, the ping-pong transmission section 23 is used.
At the same time as the main CPU 25 connected via the transmission SIO, the control data input to the sub CPU 32 for decoding and decoding the control data to control the display in the LCD display unit 30 is output by the decode / LCD output of the sub CPU 32. It is characterized in that it is configured to input to the control unit 38 via the data receiving unit 40. Therefore, in the present embodiment, the circuit configuration for inputting the LCD display data output from the main CPU 25 to the sub CPU 32 as in the prior art is omitted.

According to the configuration of this embodiment, in the main CPU 25, for example, the LED display unit 2
Lamp turn-on / off control output for 9, call circuit state control output for call circuit 26, detection of button press by key matrix unit 28, detection of up / down by handset 27a, main unit 1 from digital telephone 20 side
It can be set to output information to 0.
On the other hand, the sub CPU 32 is set so as to receive control data from the main device 10 side in parallel with the main CPU 25 and perform display output to the LCD display unit 30 corresponding to the control code of the control data. be able to.

Then, the basic control operation of the control circuit of the digital telephone with a display of the present embodiment having the above-mentioned configuration will be described. First, the digital telephone 20 of this embodiment
Is constantly controlled by the main unit 10. When the digital telephone 20 is connected to the main device 10, the existence of the terminal is established by ping-pong transmission via the ping-pong transmission units 14 and 23, and the control code in the neutral state called standby is received from the main device 10. Then, the digital telephone 20 sets each circuit to the designated state in the standby state. At this time, the LCD display unit 30 is set to perform the designated display, and the LED display unit 29 is also set to perform the designated lighting.

The above operation is performed by the terminal control unit 12 of the main unit 10.
From the ping-pong transmission section 14 to the terminal, and the control data (Dch) from the ping-pong transmission section 23 of the digital telephone 20 is received by the main CPU 25 which controls the digital telephone 20. This main CPU 25
The received control signal is output as a control signal to the communication circuit 26 corresponding to, for example, a standby code.

The main CPU 25 is the main device 1
The display control of the LED display unit 29 is performed corresponding to the blinking data of the LED (light emitting diode) sent from 0. Further, the main CPU 25 monitors the pressing of the button via the key matrix section 28, and when detecting the pressed state of the button, the main CPU 25 outputs the key code corresponding to the button (key) to the control data (Dch). ) Is sent to the main device 10 via the transmission SIO 24 and the ping-pong transmission unit 23. In this case, the main device 10 may be configured to perform a process corresponding to the key code and send a new control code to the terminal control unit 12. That is, the new control code is, for example, a control code for a handset call state, a new LED (light emitting diode) blinking code, or the like.

On the other hand, the control data (Dch) transmitted from the main unit 10 is also transmitted from the ping-pong transmission unit 23 to the sub CPU 32 in parallel with the main CPU 25. As a result, the control data relating to the display of the LCD display unit 30 transmitted from the main device 10 is decoded by the sub CPU 32.
The LCD output control unit 38 decodes the display control data, converts the display control data into a bit map based on a bit image, and the LCD display unit 3
The output is controlled to 0.

In this case, the display control data for the LCD display unit 30 can be decoded by the main CPU 25 and output to the LCD display unit 30. In order to control, it is necessary to enhance the capability of the CPU. Therefore, in the present invention, by configuring the sub CPU 32 to process the display control data of the LCD display unit 30 having a large amount of information, it becomes possible to suppress the capability of the main CPU 25 to a low level. In the case of a digital telephone without 30, the manufacturing cost can be reduced reasonably.

FIG. 2 is a circuit diagram showing another embodiment of the control circuit of the display-equipped digital telephone according to the present invention. For convenience of explanation, the same components as those of the circuit configuration shown in FIG. 1 are designated by the same reference numerals, and detailed description thereof will be omitted.

However, in the present embodiment, as shown in FIG.
The control circuit shown in (1) is characterized by adding a configuration capable of outputting a control signal from the main CPU 25 of the digital telephone 20 to the sub CPU 32. That is, in this case, the control output from the main CPU 25 is transferred to the decoding / LCD output control unit 38 of the sub CPU 32.
Is configured to be able to be received via the transmission SIO 42. Therefore, the other configurations are of course the same as those of the control circuit of the embodiment shown in FIG. 1 and have the same operation function.

In the control circuit of the display-equipped digital telephone of this embodiment having the above-mentioned configuration, the main C is particularly used.
Since the PU 25 is configured to output the control signal to the sub CPU 32, the LCD display unit 30 outputs, for example, contrast information or a test pattern as the display control data that does not depend on the control data from the main device 10. The function to do can be added.

Further, in the present embodiment, the key matrix unit 28 is operated to carry out a required operation, so that L
The CD display unit 30 can be separated from the control based on the control data from the main device 10 and switched to the control from the main CPU 25. In this case, for example, the main CPU 2
5, an EEPROM (nonvolatile memory) 44 is provided, and when the manufacturing data such as the destination setting and the manufacturing serial number of the digital telephone 20 is written, the contents can be displayed on the LCD display unit 30. This makes it possible to improve the functional value of this type of digital telephone 20.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the spirit of the present invention. .

[0034]

As is apparent from the above-described embodiments, the control circuit of the digital telephone with a display according to the present invention is connected so as to exchange voice data and control data with the main unit via the ping-pong transmission section. A main CPU, which is composed of the arranged digital telephones, is connected to the ping-pong transmission section on the digital telephone side via a transmission SIO for inputting / outputting control data, and the control data output from the ping-pong transmission section is input. In a control circuit of a digital telephone with a display, which is provided with a sub CPU configured to decode and control the display, and which is provided with a call circuit for inputting and outputting voice data to and from the ping-pong transmission section. , The control data input to the ping-pong transmission unit and the control data simultaneously with the main CPU connected via the transmission SIO. A main CPU configured to receive control data and output various control signals by directly inputting the data to a sub CPU that controls the display of the display by inputting the data directly through the data receiving unit. CPU
On the other hand, by changing the design of the sub CPU, it is possible to easily and easily change to a high-performance model specification, and at a low cost.

Further, according to the control circuit of the digital telephone with a display according to the present invention, in the main CPU, for example, the lamp lighting / extinguishing control output, the call circuit state control output,
The LCD display control output, button press and handset up / down detection, and information output from the telephone side to the main unit are set, and in the sub CPU,
The control data from the main unit is received in parallel with the main CPU, and LC is received in accordance with the control code of the control data.
By setting the D display output, for example, 8
Many excellent advantages can be obtained, such as a change in the specification of 24 characters per line to a high function can be realized easily and at low cost by a simple design change of a one-chip microcomputer.

[Brief description of drawings]

FIG. 1 is a schematic circuit configuration diagram showing an embodiment of a control circuit of a digital telephone with a display according to the present invention.

FIG. 2 is a schematic circuit configuration diagram showing another embodiment of the control circuit of the digital telephone with a display according to the present invention.

FIG. 3 is a schematic circuit configuration diagram of a control circuit of a conventional digital telephone with a display.

[Explanation of symbols]

10 Main device 12 Terminal control unit 14 Ping-pong transmission section 20 digital telephone 22 ASIC (Application Specified IC) 23 Ping Pong Transmission Unit 24 Transmission SIO (Serial I / O) 25 Main CPU 26 call circuit 27a handset 27b speaker 27c microphone 28 Key matrix part 29 LED display 30 LCD display 32 sub CPU 34 ROM 35 character ROM 36 RAM 38 Decode / LCD output controller 40 data receiver 42 SIO 44 EEPROM

Claims (5)

[Claims] 1. A digital telephone configured to be connected and arranged to exchange voice data and control data via a ping-pong transmission section with a main device, and perform input / output of control data with the ping-pong transmission section on the digital telephone side. A main CPU connected via a transmission SIO and a sub CPU configured to control the display by inputting and decoding control data output from the ping-pong transmission unit are provided, and In a control circuit of a digital telephone with a display, which comprises a call circuit for inputting / outputting voice data between the control data input to the ping-pong transmission unit and the main CPU connected via the transmission SIO at the same time. , Inputting the control data, decoding it, and inputting it directly to the sub CPU that controls the display of the display through the data receiving unit. Control circuit with a display unit digital telephone, characterized in that the configuration was. 2. The main CPU is set to perform a lamp lighting / extinguishing control output, a call circuit state control output, an LCD display control output, a button press and handset up / down detection, and information output from the telephone side to the main unit. A control circuit for a digital telephone with a display unit according to claim 1, wherein: 3. The sub CPU is set so as to receive control data from the main device side in parallel with the main CPU and perform LCD display output corresponding to a control code of the control data. A control circuit for a digital telephone with a display according to claim 1. 4. The control data from the main CPU is SI
4. The control circuit for a digital telephone with a display device according to claim 1, wherein the control circuit is configured to input to the sub CPU via O. 5. The ASIC according to claim 1, wherein the ping-pong transmission section and the main CPU connected via a transmission SIO for inputting / outputting control data are configured as one ASIC. A control circuit for the digital telephone with the described display.