JP2936823B2 - Modem device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a modem device,
More specifically, the present invention relates to a modem device capable of reducing power consumption.

[0002]

2. Description of the Related Art FIG. 6 is a block diagram showing an example of a conventional modem device 51. The modem device 51 includes an internal processing mode for performing processing inside the modem device, a command mode for receiving a command from a DTE (terminal of a user of the modem device), and a communication mode for actually performing data communication via a communication line. Has three operation modes.
The modem device 51 controls the modem device 51.
CPU 52 that modulates and demodulates and demodulates signals
4 and programs for implementing the various modes described above.
A ROM 5 for temporarily storing data, a RAM 6 for temporarily storing data,
An interface between the modem 4 and the communication line
Resetting the interface circuit 7 and the CPU 52
And a reset circuit S.

The first data input / output port D of the CPU 52
1, the ER signal input terminal INP is connected to the corresponding D
It is connected to the terminal of TE. The second data input / output port D2 of the CPU 52 includes a modulation / demodulation circuit 4, a ROM 5, a RAM
6 is connected to each port. The reset terminal RST of the CPU 52 is connected to the power supply VCC for the modem device via the power-on reset capacitor C, and to the ER signal output terminal of the DTE via the reset circuit S. The reset circuit S outputs E from the ER signal output terminal of the DTE.
It has a function of generating a reset signal when the R (data terminal ready) signal rises. The selection output terminal CS of the CPU 52 is connected to the selection input terminal NOTCE of the ROM 5 via the inverter B. A communication line is connected to the modulation / demodulation circuit 4 via an interface circuit 7.

Next, the operation of the modem device 51 will be described. When the CPU 52 is reset when the power supply VCC for the modem device is turned on or when the ER signal from the DTE rises, the modem device 51 performs necessary internal processing and enters a command mode for receiving a command from the DTE. Next, after performing processing corresponding to the received command, the modem device 51 performs data communication.

[0005]

In the above-mentioned conventional modem device 51, power is always supplied to all circuits inside the modem device .
In the internal processing mode where the processing of the
Is not used, there is a problem that power consumed by unnecessary circuits is wasted.

An object of the present invention is to provide a modem device which reduces power consumption by supplying power only to circuits necessary for actual operation of the modem device.

[0007]

According to a first aspect, the present invention comprises a CPU for controlling a modem device.
The internal processing mode that performs processing inside the modem device by the operation of
And over de, a command mode to accept commands from a user terminal, at least a modem device and a communication mode for communicating via the communication line, the internal processing
And switch means for power supply to the communication-related parts of the modem device is stopped or reduced sense mode, the Komandomo
Communication by a predetermined command from the user's terminal when loading
Power supply means to start power supply to related parts
A modem device is provided.

[0008] In a second aspect, the present invention provides a modem device.
A CPU that controls the
At least an internal processing mode for processing inside the
A modem device that operates in the internal processing mode.
Power supply to communication-related parts of the
And a CPU control means for setting the CPU to a power-down mode in response to a predetermined signal from a terminal of a user of the modem device. In a third aspect, the present invention provides a method for controlling a modem device.
And a modulation / demodulation circuit.
And an internal processing mode that performs processing inside the modem device.
Command mode that accepts commands from the user's terminal
A modem device having at least:
A buffer between the internal processing mode
The modulation and demodulation after stopping the operation of the buffer
Stop or reduce the power supply to the circuit and
Command in the command mode in the command mode.
After starting the power supply to the modem circuit, the buffer is
A switch comprising operating switch means.
A dem device is provided.

[0009]

In the modem device of the first aspect, the internal processing mode
Sometimes, power is supplied to communication-related parts that do not need to operate.
Stop or decrease pay. In command mode
Is operated by the user to the communication related city
Power supply is started. Therefore, use a modem device.
When there is no power, it is possible to save power consumed by communication-related parts.

In the modem device according to the second aspect, when the modem device is not used, the CPU can be put into the power down mode by a predetermined signal from the user's terminal. This behavior occurs when the modem device is not used.
Power supply to communication-related parts of the
Since the power consumption is reduced after power saving, not only can the power consumption of the CPU be reduced, but also the power consumption of the entire modem device.
You can save power . With the modem device of the third viewpoint
Is when the power supply to the modem is stopped or reduced
When the through operation of the buffer is stopped, the modem
The circuit signal stops, and the power supply to the modem is turned off.
When power is supplied to the modem,
The buffer performs a through operation.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to the embodiments shown in the drawings. It should be noted that the present invention is not limited by this. FIG. 1 is a block diagram of a modem device according to one embodiment of the present invention. This modem device 1
An internal processing mode for performing processing inside the modem device, and a DTE
And a communication mode in which data communication is actually performed via a communication line. And this modem device 1
Is a CPU 2 for controlling the modem 1, a buffer
Buffer 3 with modulation function, modulation and demodulation for modulating and demodulating signals
Circuit 4, ROM 5 for storing programs, temporary data
RAM 6 for storing, between the modem 4 and the communication line
Interface circuit 7 for interfacing, said restoration
Power supply to the adjustment circuit 4 and the interface circuit 7
Switch 8 for switching the CPU, resetting the CPU 2
And a reset circuit S.

The relay control output terminal G1 of the CPU 2 is connected to the relay control terminal RG of the relay switch 8. The buffer gate output terminal G2 of the CPU 2 is connected to the gate terminal GT of the buffer 3. First data input / output port D1, ER signal input terminal INP of CPU2
Are connected to corresponding DTE terminals. A second data input / output port D2 of the CPU 2 is connected to a modulation / demodulation circuit 4 via a buffer 3,
5 and each port of the RAM 6. CPU2
The reset terminal RST is connected to a power supply VCC for a modem device via a power-on reset capacitor C and to an ER signal output terminal of the DTE via a reset circuit S. The reset circuit S has a function of generating a reset signal when the ER signal output from the ER signal output terminal of the DTE rises. The selection output terminal CS of the CPU 2 is connected to the selection input terminal NOTCE of the ROM 5 via the inverter B and the RC integration circuit T. A communication line is connected to the modulation / demodulation processing circuit 4 via an interface circuit 7. The power supply VCC for the modem device is connected to the CPU 2 and the battery.
F3, ROM5, RAM6
Circuit 4 and interface circuit 7 are relay switches
8 are connected.

FIG. 2 is a flowchart showing a processing procedure in the main routine of the modem device 1. CPU2
Is reset when the power supply VCC for the modem device is turned on or when the ER signal from the DTE rises (step 1). The modem device 1 enters an internal processing mode (details will be described later) and performs prescribed internal processing (step S2). The modem device 1 enters a command mode (details will be described later), and
(Step S3). The modem device 1 enters a communication mode (details will be described later) and performs data communication via a communication line (step S4). The above flow
As shown in the chart, the modem device 1 is connected to the power supply VCC.
Reset by power-on or ER from DTE
Signal, then reset to internal processing mode, command
Mode and communication mode are sequentially executed.

FIG. 3 is a flowchart showing a processing procedure in step S2 (see FIG. 2) in which the internal processing mode is entered. The modem device 1 performs the original processing in the internal processing mode (step S21).

The CPU 2 has a buffer gate output terminal G2
Is Hi. The buffer 3 becomes high impedance (step S22). Therefore, the through of buffer 3 is
finish. The CPU 2 sets the relay control output terminal G1 to Hi.
To turn off the relay switch 8 (step S2
3) Stop supplying power to the modulation / demodulation circuit 4 and the interface circuit 7.

The CPU 2 outputs the ER signal from the DTE to Hi.
Is determined. If Hi, step S2
Go to 5. If not Hi, the process proceeds to step S26.

In step S25, the process returns to the main routine.

At step S26, the CPU 2 reads the ROM 5
Is fetched from the ROM 5 and then executed, and the level of the selection output terminal CS is set to Lo. However, since the RC integration circuit T is provided between the selection output terminal CS of the CPU 2 and the selection input terminal NOTCE of the ROM 5, the level of the selection input terminal NOTCE of the ROM 5 remains Lo for a while. The situation continues. During this time, the CPU 2 fetches an instruction from the ROM 5 for the CPU 2 to enter the power down mode. Thereafter, the CPU 2 executes the command and enters the power down mode. After the CPU 2 finishes fetching the instruction to enter the power down mode from the ROM 5, the level of the selection input terminal NOTCE of the ROM 5 becomes the threshold level TH.
, And the ROM 5 enters a non-selection state (power saving mode) (step S27). The CPU 2 stops in the power down mode (step S29). As a signal from the DTE that enters the power down mode, a signal newly defined by a user of the modem device can be used in addition to the ER signal. The above flow
As shown in the chart, the modulation / demodulation circuit 4 and the interface
Before the supply of power to the
3 is stopped. In internal processing mode
Then, supply of power to the modulation / demodulation circuit 4 and the interface circuit 7 is performed.
If the supply stop and the through operation stop of the buffer 3 continue,
CPU 2 enters its own power down mode and saves.
Power.

FIG. 4 is a flowchart showing a processing procedure in step S3 (see FIG. 2) in which the command mode is entered. The modem device 1 performs a command mode original process (step S31).

The CPU 2 determines whether or not the command received from the DTE is an ATD (auto dial) command. If it is an ATD command, step S33
Proceed to. If it is not an ATD command, step S3
Go to Step 4 (Step S32).

In step S33, the CPU 2 sets the relay control output terminal G1 to Lo, turns on the relay switch 8 (step S33), and supplies power to the modem circuit 4 and the interface circuit 7.

In step S34, the modem device 1
A command corresponding process corresponding to the command received by U2 is performed.

The CPU 2 has a buffer gate output terminal G2
Is set to Lo, and the buffer 3 is set to through (step 3
5). The process returns to the main routine (Step S36).

Incidentally, in addition to the ATD command, or
Instead, a command defined by the user, a loop test command, or the like may be used. The above flowchart
As shown by, the modulation and demodulation is first performed with a predetermined signal from the DTE.
Power is supplied to the circuit 4 and the interface circuit 7,
Thereafter, the buffer 3 starts a through operation.

FIG. 5 shows a step S4 in which the communication mode is entered.
3 is a flowchart showing a processing procedure in (see FIG. 2). The modem device 1 performs processing inherent in the communication mode, such as dialing based on an ATD command received from the DTE (step S41).

The CPU 2 determines whether the communication line is disconnected. If the communication line is disconnected, step S
4 proceed to 5. If the communication line is in the connected state, step S4
Returning to 1 (step 42).

Return to the main routine (step S4)
5).

[0028]

According to the modem device of the first aspect of the present invention, unnecessary power for communication-related parts can be saved in the internal processing mode. In command mode
Power supply to communication-related parts by user's terminal operation.
You can start. Therefore, when not using a modem device
The power consumption of the entire modem device can be reduced. Further, according to the modem device of the second aspect, when the modem device is not used , the power saving of the communication-related portion of the modem device is achieved.
Power consumption of the CPU can be reduced in accordance with the above , so that the power consumption of the entire modem device can be further reduced.
Can be done. According to the modem device of the third aspect,
In order to reduce power consumption of dem device, stop signal transmission.
After shutting down, save power in the communication-related parts of the modem device.
To operate the modem device.
After starting to supply power to the communication-related parts of the modem device
Can be transmitted. Therefore, the present invention is advantageous as a modem device having a large power capacity, such as a modem device built in a portable computer.

[Brief description of the drawings]

FIG. 1 is a block diagram of a modem device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a processing procedure in a main routine of the modem device of FIG. 1;

FIG. 3 is a flowchart showing a processing procedure in a main routine of FIG. 2;

FIG. 4 is a flowchart showing a processing procedure in a main routine of FIG. 2;

FIG. 5 is a flowchart showing a processing procedure in a main routine of FIG. 2;

FIG. 6 is a block diagram of an example of a conventional modem device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Modem device 2 CPU 3 Buffer 4 Modulation / demodulation circuit 5 ROM 6 RAM 7 Interface circuit 8 Relay switch VCC Modem device power supply B Inverter C Power-on reset capacitor S Reset circuit T RC integration circuit DTE terminal 51 Modem device 52 CPU

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H04L 29/00

Claims (3)

(57) [Claims] A CPU for controlling a modem device;
Of processing inside the modem device by the operation of the CPU
And a command mode for receiving a command from a user terminal, and a communication mode for performing communication via a communication line, wherein a power supply to a communication-related portion of the modem device in the internal processing mode is provided. Switch means for stopping or decreasing the supply ;
Predetermined command from user terminal in command mode
A power supply operator that starts power supply to the communication-related part at
Modem device being characterized in that comprising a stage. And a CPU for controlling a modem device.
Internal processing that performs processing inside the modem device by the operation of the CPU
In a modem device having at least a processing mode, after stopping or reducing power supply to a communication-related portion of the modem device in the internal processing mode , the CPU is caused to respond to a predetermined signal from a terminal of a user of the modem device. A modem device comprising CPU control means for setting a power down mode. 3. A modem for controlling a modem device and a modulation / demodulation circuit.
And a path inside the modem device by the operation of the CPU.
And internal processing mode for processing calls from the end edge of the user
At least a command mode that accepts commands
And a buffer between the CPU and the modem.
After stopping the operation of the buffer in the section processing mode
When the power supply to the modulation / demodulation circuit is stopped or reduced,
In the command mode, a predetermined
After starting the power supply to the modem by command
A switch means for operating the buffer is provided.
Modem device.