JP2000332927A - Device and method for data processing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To minimize power consumption in a standby mode in the case of performing high-speed processing with a compact configuration. SOLUTION: This processor has power supply circuits 8 and 9 of a small capacity and large capacity and performs switching control between 1st processing in which the processor increases the maximum supply current capacity of the circuit 9 in accordance with receiving data from an external device 1 so as to subsequently increase a clock frequency to be supplied and 2nd processing in which the processor lowers the clock frequency to be supplied in the case the next data is not received even after a prescribed time passes after receiving the data from the device 1 so as to subsequently reduce the maximum supply current capacity of the circuit 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data processing apparatus and a data processing method, and more particularly to a data processing apparatus and a data processing method capable of controlling power consumption during standby in accordance with a data input mode. The present invention relates to a possible data processing device and data processing method.

[0002]

2. Description of the Related Art In recent years, personal computers (hereinafter, referred to as personal computers).
In order to deal with environmental problems for PCs and peripheral devices, it is desired to reduce the power consumption of the devices.

[0003] In particular, the reduction of power consumption during standby of equipment is specified by the EPA Energy Star standard and the like. This is because many printers are usually left idle in standby mode, and the power consumption of the printer in standby mode becomes dominant with respect to the average power consumption of the apparatus.

For example, in a printer using an electrophotographic technique, such as a laser beam printer or an LED printer, a fixing device for fixing printing toner to paper by heat is used.
Since the power consumption of the fixing device occupies a large amount of the power consumption of the apparatus, a power save mode in which the heating of the fixing device is stopped when the printer is on standby is often adopted.

However, even if the printer is in the power save mode, the power supply circuit for supplying power to the control circuit is always operating so that data can be received from an external device (such as a PC) at any time. Therefore, it is necessary to reduce the power consumption of these circuits.

[0006]

In particular, when the speed of a printer is increased and the size thereof is increased, the size of a motor as a driving source for paper conveyance is increased, and power consumption is increased.

When the power consumption of a motor increases, the size of a power supply switching transformer for operating the motor also increases.

Further, when the size of the switching transformer is increased, light load loss (mainly, iron loss) when driving the transformer is increased, and as a result, power consumption during standby is also increased.

If the speed of the printer is increased as described above, the power consumption during standby increases, and it becomes difficult to keep the average power consumption low.

It is an object of the present invention to provide a data processing apparatus and a data processing method capable of performing high-speed processing while minimizing the power consumption during standby with a compact configuration.

[0011]

SUMMARY OF THE INVENTION The present invention relates to an apparatus for controlling power consumption in a standby mode in accordance with a data input mode, comprising: receiving means for receiving data from an external device; To image data, power supply means for changing the maximum power supply capacity in at least two stages and supplying power required for operation of the data conversion means, and at least two or more types of frequencies Clock output means for selectively outputting a clock signal and a reference clock necessary for the operation of the data conversion means, and the power supply being synchronized with the data receiving means receiving data from the external device. First control means for increasing the maximum power supply capacity of the supply means and thereafter increasing the frequency of the clock output from the clock output means If the data receiving unit does not receive the next data after a predetermined time has elapsed after receiving the data from the external device, the frequency of the clock output from the clock output unit is reduced, And a second control means for reducing the maximum power supply capacity of the supply means to constitute a data processing device.

Here, the power supply means has a first power supply circuit having a first level maximum power supply capacity, and an output section commonly connected to an output section of the first power supply circuit. And a second power supply circuit having a maximum power supply capacity of a second level higher than the first level, wherein the second power supply circuit switches from the data reception unit or the data conversion unit. Means may be provided for controlling the supply amount of output power output from the output section of the second power supply circuit based on the signal.

[0013] The image processing apparatus may further include image forming means for forming a print image based on the image data output from the data conversion means.

According to the present invention, there is provided a data processing method for controlling power consumption in a standby mode in accordance with a data input mode, comprising the steps of receiving data from an external device, and converting the received data into image data. Converting, and changing the maximum power supply capacity in at least two or more steps,
A step of supplying power required for the conversion operation to the image data; and a step of selectively outputting clocks of at least two or more types of frequencies, and a step of outputting a reference clock required for the conversion operation to the image data. Synchronizing with receiving data from the external device, increasing the maximum power supply capacity required for the conversion operation to the image data,
Increasing the frequency of the output clock;
If the next data is not received after a lapse of a predetermined time from the reception of the data from the external device, the frequency of the output clock is reduced, and then the maximum required for the conversion operation to the image data is performed. Reducing the power supply capacity.

The present invention is a medium in which a program for controlling power consumption during standby in accordance with a data input mode by a computer is recorded, and the control program causes a computer to receive data from an external device. The received data is converted to image data, and in synchronization with receiving data from the external device,
The maximum power supply capacity required for the conversion operation to the image data is increased, then the frequency of the output clock is increased, and after a predetermined time has elapsed after receiving data from the external device, the following If no data is received, lower the frequency of the output clock, and then
A medium in which a data processing control program is recorded is provided by reducing a maximum power supply capacity required for an operation of converting the image data into image data.

According to the present invention, there is provided an apparatus for controlling power consumption in a standby mode in accordance with a data input mode, a receiving unit for receiving data from an external device, and converting the received data into image data. Data conversion means, a power supply means for changing the maximum power supply capacity in at least two stages, and a power supply means for supplying power required for the operation of the data conversion means, and selectively providing clocks of at least two or more frequencies. A clock output means for outputting a reference clock necessary for the operation of the data conversion means, and a maximum power supply of the power supply means in synchronization with the data reception means receiving data from the external device. First control means for increasing the capacity and then changing the frequency of the clock output from the clock output means; If the means does not receive the next data after a predetermined time has elapsed after receiving the data from the external device, the frequency of the clock output from the clock output means is changed, The data processing device is configured by including the second control means for reducing the power supply capacity.

The present invention is a data processing method for controlling power consumption in a standby mode in accordance with a data input mode. The method includes the steps of receiving data from an external device, and converting the received data into image data. Converting, and changing the maximum power supply capacity in at least two or more steps,
A step of supplying power required for the conversion operation to the image data; and a step of selectively outputting clocks of at least two or more types of frequencies, and a step of outputting a reference clock required for the conversion operation to the image data. Synchronizing with receiving data from the external device, increasing the maximum power supply capacity required for the conversion operation to the image data,
Changing the frequency of the output clock;
If the next data is not received even after a lapse of a predetermined time from the reception of the data from the external device, the frequency of the output clock is changed, and the maximum power required for the conversion operation to the image data is changed. Providing a data processing method by reducing the supply capacity.

According to the present invention, there is provided a medium recording a program for controlling power consumption in a standby mode in accordance with a data input mode by a computer, wherein the control program causes the computer to receive data from an external device. The received data is converted to image data, and in synchronization with receiving data from the external device,
The maximum power supply capacity required for the conversion operation to the image data is increased, thereafter, the frequency of the output clock is changed, and after a predetermined time has elapsed after receiving data from the external device, the following When data is not received, the medium on which the data processing control program is recorded is provided by changing the frequency of the output clock and reducing the maximum power supply capacity required for the conversion operation to the image data. .

[0019]

Embodiments of the present invention will be described below in detail with reference to the drawings.

[Outline] First, an outline of the present invention will be described.

According to the present invention, as shown in FIG.
A data receiver 2 for receiving data from the data receiver 2, a data converter 3 for converting image data according to data obtained from the data receiver 2, an image forming unit 4 for forming a print image in accordance with an output of the data converter 3, and a data converter. An apparatus such as a printer including power supply circuits 8 and 9 for supplying power required for the operation of the converter 3 and clock supply means 5 and 6 for providing a reference clock required for the operation of the data converter 3 About.

In this case, the power supply circuits 8 and 9 can change the maximum supply current capacity in at least two or more steps, and the clock supply means 5 and 6 select at least two or more types of frequency clocks. It is possible to supply it.

In such a device, the maximum supply current capacity of the power supply circuit 9 is increased in synchronization with the reception of the data from the external device 1 by the data receiver 2, and thereafter, the clock supply means 5, 6 If the first processing for increasing the clock frequency and the next data is not received after a predetermined time has elapsed since the data receiver 2 has received the data from the external device 1, the clock supply means 5, 6 The clock frequency is reduced, and then the second process for reducing the maximum supply current capacity of the power supply circuits 8 and 9 is selectively executed.

[Specific Example] Next, a specific example will be described.

An embodiment of the present invention will be described with reference to FIGS.

(System Configuration) First, the configuration of the present system will be described with reference to FIG.

FIG. 2 shows a printer as a data processing device according to the present invention. Here, an example of a configuration centering on a data conversion unit and a power supply unit is shown.

(Configuration of Data Conversion Unit) The configuration of the data conversion unit will be described.

Reference numeral 1 denotes an external device connected to the printer, which is a host computer here.

Reference numeral 2 denotes a printer data receiver connected to the host computer 1.

The host computer 1 sends a data receiver 2
, Coded print data is obtained.

In this case, if the interface connecting the host computer 1 and the data receiver 2 is, for example, a Centronics interface, the data receiver 2
May simply be an I / O buffer.

If the interface connecting the host computer 1 and the data receiver 2 is, for example, a serial interface, the data receiver 2 comprises an I / O buffer and a real communication controller.

A data converter 3 reads the print data received by the data receiver 2, analyzes the contents, and converts the read data into bitmap data converted into bitmaps, that is, image data (rasterized data). is there.

The data converter 3 includes a microprocessor 3a, a ROM 3b, a RAM 3c, a logic circuit 3d, etc., for converting coded information into bit map information.

In this case, a control program for performing data processing according to the present invention (FIG.
And a control program for performing data conversion processing, as well as character font information and graphic information.

The RAM 3c is used for storing primary storage data and bitmap data so that the microprocessor 3a can operate according to the program stored in the ROM 3b.

As long as the processing speed of the printer is high and the resolution is high, the microprocessor 3a is naturally required to have high performance. At 600 dpi and 8 ppm or more, a 32-bit microprocessor is used, and the internal operation clock extends to 50 MHz or more to improve processing speed.

Reference numeral 5 denotes an oscillator for generating a clock signal CLK1. As the oscillator 5, for example, 100M
Hz crystal oscillator can be used.

Reference numeral 6 denotes a frequency divider that generates a frequency-divided signal MCLK by receiving the clock signal CLK1. The frequency divider 6 receives the control signal CSLT from the data converter 3 and outputs 100 MH.
The clock signal CLK1 of z can be divided by 2 or 20.

Thus, when the frequency division by 2 is selected, 50
A frequency-divided signal MCLK of MHz is output, and when frequency division of 20 is selected, a frequency-divided signal MCLK of 5 MHz is output.

Microprocessor 3 in data converter 3
The operation clock a is based on the frequency-divided signal MCLK.

Reference numeral 4 denotes an image forming unit that receives the bitmap data generated by the data converter 3 and prints an image on a sheet according to the received bitmap data.

The data converter 3 includes a microprocessor 3a, a ROM 3b, a RAM 3c, a logic circuit 3d, and the like.
It is composed of an LSI device.

If recent microfabricated semiconductor technology is used, C
MOS processes provide the most highly integrated devices. The CMOS can operate at a higher speed and reduce power consumption in accordance with fine manufacturing process rules, if adopted. The power consumption of a CMOS device is often proportional to its operating frequency.

If the data converter 3 selects divide-by-20 as the control signal CSLT, the power consumption can be reduced to about 1/10 compared to the case of divide-by-2 (however, this value is a guideline). If the circuit operation differs between the divide-by-2 and divide-by-20 cases, the value will be shifted.)

(Configuration of Power Supply Circuit) The configuration of the power supply circuit will be described.

A CMOS or TTL device is used as a control circuit in the data receiver 2, the data converter 3, and the image forming unit 4, and the power consumption is extremely high in these circuits. Is a data converter 3.

A power supply circuit described below supplies DC power to these circuits.

Reference numeral 7 denotes an externally input AC power supply, which is 100 V AC and 50 Hz to 60 Hz in Japan.

8 and 9 are AC power supplied from the AC power source 7.
The power supply circuit converts a voltage into a DC voltage.

The power supply circuits 8 and 9 include primary rectifier circuits 8a and 9a, switching transformers 8b and 9b, semiconductor switching elements 8c and 9c, and secondary rectifier circuits 8d and 9 respectively.
d, feedback control circuits 8e, 9e, etc.

The power supply circuit 8 has one output terminal 8f, which outputs an output signal VCCSUB. The output signal VCCSUB is input to each power supply terminal of the data receiver 2, the data converter 3, the oscillator 5, and the frequency divider 6.

The power supply circuit 9 has two output terminals 9f and 9g.
have. The output terminal 9f outputs the output signal VCC1 (+5
V). The output signal VCC1 is output from the data converter 3
And input to the image forming unit 4. On the other hand, output terminal 9g
Outputs an output signal VCC2 (+24 V). The output signal VCC2 is input to the image forming unit 4. Inside the image forming unit 4, a power device such as a motor is provided, and the motor operates with the output signal VCC2.

The output signal VCC from the power supply circuit 8
SUB and the output signal VCC1 from the power supply circuit 9 are connected at a common connection point P via a diode 10.

The maximum supply current of the output signal VCCSUB of the power supply circuit 8 is set to an extremely small value compared to the maximum supply current of the output signal VCC1 of the power supply circuit 9. Therefore, the size of the switching transformer 8b of the power supply circuit 8 can be made extremely smaller than that of the switching transformer 9b of the power supply circuit 9.

The power supply circuit 9 has a control input terminal 9.
h is provided. A signal PSLT for switching the power supply circuits 8 and 9 is input to the control input terminal 9h under the control of the microprocessor 3a of the data converter 3. This switching control will be described later in detail with reference to the flowchart of FIG.

(Circuit Operation) Here, the circuit operation of the power supply circuits 8 and 9 will be described. Signal P from data converter 3
By switching the SLT to the high level or the low level and inputting it to the control input terminal 9h of the power supply circuit 9, a voltage is supplied to the output terminals 9f and 9g (on state), or the supply of the voltage is cut off. High impedance (off state) can be achieved. That is, the signal PSLT is a so-called remote signal of the power supply circuit 9.

When the data converter 3 outputs the signal PSLT indicating the OFF state and makes the power supply circuit 9 inactive, the output signal VCC1 at the output terminal 9f of the power supply circuit 9 is output.
Is in a high impedance state, and the supply of voltage is cut off.

In this case, the voltage of the output signal VCCSUB appearing at the output terminal 8f of the power supply circuit 8 is + 5V, and the voltage of + 5V is supplied via the diode 10 to the common connection point P.
Is output to However, the voltage appearing at the common connection point P is
The value becomes about 4.4 V, which is lower by the voltage drop Vf = 0.6 V of the diode 10.

Accordingly, a current flows from the power supply circuit 8 to the power supply terminal 3e of the data converter 3 via the diode 10.
However, the maximum amount of current from the power supply circuit 8 at this time is a very small value for the reason described above.

On the other hand, when the signal PSLT indicating the ON state is output from the data converter 3 and the power supply circuit 9 is activated, the voltage of the output signal VCC1 appearing at the output terminal 9f becomes + 5V, and this voltage Is output to the common connection point P. In this case, since the voltage level of the cathode of the diode 10 connected to the common connection point P increases, the diode 10 is turned off, and no current flows from the power supply circuit 8.

Then, +5 corresponding to this signal VCC1
The voltage V is applied to the power supply terminal 3 e of the data converter 3 and the same voltage is applied to the image forming unit 4.

As described above, by switching the operation of the power supply circuit 9 in accordance with the signal PSLT output from the data converter 3, it is possible to control the power supply to the data converter 3 and the image forming unit 4. it can. The power supply circuit 9
Is controlled by the signal PS from the data converter 3.
The switching is not limited to the LT, and for example, the switching may be performed directly in response to the data reception of the data receiver 2.

(System Operation) Next, the operation of the present system will be described in more detail with reference to the flowchart of FIG. Here, the following control is performed by the microprocessor 3a of the data converter 3.

First, it is checked whether or not the data receiver 2 is receiving data (step S1). After the last received data is read by the data converter 3, the next data is passed even if a predetermined time has elapsed. Is checked (step S2).

If the next data has not been sent after the lapse of the predetermined time, the flow advances to step S3 to enter the power saving mode. On the other hand, if the next data has been sent within the predetermined time, the flow advances to step S5 to enter the data processing mode.

In the power saving mode of step S3, first,
By the control signal CSLT, the divided signal MCLK
Is set to 5 MHz (low frequency mode of frequency division by 20) (step S3). The frequency-divided signal MCLK of 5 MHz is input to the data converter 3.

After a while, the signal PSLT is output to turn off the power supply circuit 9 (step S
4).

Therefore, in this power saving mode, the power supply circuit 9 is not operating, and only the power supply circuit 8 is operating.

In such a state, the power supply circuit 8 is connected to the power supply terminal 3 e of the data converter 3 via the diode 10.
A small current is supplied as an output signal VCCSUB from the output terminal 8f of the second circuit. Since the switching transformer 8b of the power supply circuit 8 is small, iron loss is small, and accordingly, the power consumption viewed from the input side of the power supply circuit 8 also has a small value.

Since the power supply circuit 9 is in the off mode and the internal primary-side switching element 8c is off, the power consumption viewed from the input side of the power supply circuit 9 is extremely small. Become. Therefore, when the power consumption of the control circuit is small, power can be supplied by a small transformer having a small drive loss, and the power consumption in the power saving mode can be significantly reduced.

On the other hand, in the data processing mode of step S5, the data converter 3 reads the received data, outputs the signal PSLT, and turns on the power supply circuit 9 (step S5).

At this time, a voltage of +5 V is output to output terminal 9f of power supply circuit 9 as output signal VCC1, and this voltage is applied to power supply terminal 3e of data converter 3, whereby a large-capacity current is supplied. You. At this time, no current flows through the diode 10 connected to the common connection point P.

Then, after a while, the data converter 3
Is divided by the control signal CSLT into the divided signal MC.
LK is set to 50 MHz (high frequency mode of dividing by 2) (step S6). This 50 MHz divided signal MCLK
Is input to the data converter 3.

Thus, the data converter 3 analyzes the received data and performs data conversion processing.

In the data processing mode, the power consumption of the data converter 3 is increased because the clock frequency is increased to 50 MHz. However, since the power supply circuit 9 has already been turned on, it is possible to supply a sufficient power supply current to the data converter 3 from the power supply circuit 9 having a high current supply capability.

When one page of bitmap data is developed after the data converter 3 starts to process the received data, the data converter 3 sends the generated bitmap data to the image forming unit 4. As a result, the image forming section 4 performs image processing of the data based on the received data (step S7).

Thereafter, in step S8, it is determined whether or not the data processing has been completed. If the processing has not been completed, the flow returns to step S1 to perform the same processing.

The present invention can be applied to a system including a plurality of devices (for example, a host computer, an interface device, a reader, and a printer).
The present invention may be applied to an apparatus including two devices (for example, a copying machine and a facsimile machine).

Further, it is needless to say that the present invention can be applied to a case where the present invention is achieved by supplying a program to a system or an apparatus. Then, a storage medium storing a program represented by software for achieving the present invention is supplied to a system or an apparatus, and the computer (or CPU or M) of the system or the apparatus is supplied.
(PU) reads out and executes the program code stored in the storage medium, so that the effects of the present invention can be enjoyed.

In this case, the program code itself read from the storage medium realizes the functions of the above-described embodiment, and the storage medium storing the program code constitutes the present invention.

Examples of the storage medium for supplying the program code include a floppy disk, hard disk, optical disk, magneto-optical disk, CD-ROM, and CD.
-R, magnetic tape, nonvolatile memory card, ROM
(A mask ROM, a flash EEPROM, or the like) can be used.

When the computer executes the readout program code, not only the functions of the above-described embodiment are realized, but also the OS (Operating System) running on the computer based on the instruction of the program code. ) May perform some or all of the actual processing, and the processing may realize the functions of the above-described embodiments.

Further, after the program code read from the storage medium is written to a memory provided in a function expansion port inserted into the computer or a function expansion unit connected to the computer, the program code is read based on the instructions of the program code. It goes without saying that the CPU included in the function expansion board or the function expansion unit performs part or all of the actual processing, and the processing realizes the functions of the above-described embodiments.

[0086]

As described above, according to the present invention,
A first process that has a small-capacity and large-capacity power supply circuit, and increases the maximum supply current capacity of the power supply circuit and then increases the supplied clock frequency in response to receiving data from an external device. If, after receiving the data from the external device, a predetermined time has elapsed and the next data is not received, the supplied clock frequency is reduced,
Thereafter, the switching control with the second processing for reducing the maximum supply current capacity of the power supply circuit is performed. Therefore, if the image forming unit such as printing is not executed for a predetermined time, the power saving mode is set. And reduce the clock speed of the control circuit of the image forming unit, reduce the power consumption of the control circuit, reduce the maximum supply current of the power supply circuit, and reduce the loss of the power supply circuit itself at light load. Accordingly, power consumption during power saving can be significantly reduced, and energy saving can be achieved even when data processing is speeded up.

[Brief description of the drawings]

FIG. 1 is a flowchart illustrating a process of performing power control corresponding to data input according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a data processing device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 External equipment 2 Data receiver 3 Data converter 4 Image formation part 5 Oscillator 6 Divider 7 AC power supply 8 Small capacity power supply circuit 9 Large capacity power supply circuit

Claims (18)

[Claims] 1. An apparatus for controlling power consumption during standby according to a data input mode, comprising: a receiving unit for receiving data from an external device; and a data for converting the received data into image data. Conversion means; a power supply means for changing the maximum power supply capacity in at least two or more stages and supplying power required for the operation of the data conversion means; and selectively outputting clocks of at least two or more frequencies. A clock output unit that outputs a reference clock necessary for the operation of the data conversion unit; anda maximum power supply capacity of the power supply unit in synchronization with the data reception unit receiving data from the external device. First control means for increasing the frequency of the clock output from the clock output means, and thereafter, the data receiving means If the next data is not received even after a predetermined time has elapsed after receiving the data from the external device, the frequency of the clock output from the clock output unit is reduced, and the maximum power supply of the power supply unit is performed. A data processing apparatus comprising: a second control unit for reducing a capacity. 2. The power supply means includes: a first power supply circuit having a maximum power supply capacity at a first level; and an output unit commonly connected to an output unit of the first power supply circuit. And a second higher than the first level
A second power supply circuit having a maximum power supply capacity of a level of the second power supply circuit, based on a switching signal from the data receiving means or the data conversion means. 2. The data processing apparatus according to claim 1, further comprising means for controlling a supply amount of output power output from the output unit. 3. The data processing apparatus according to claim 1, further comprising an image forming unit that forms a print image based on the image data output from the data conversion unit. 4. A data processing method for controlling power consumption during standby according to a data input mode, comprising: receiving data from an external device; and converting the received data into image data. Changing the maximum power supply capacity in at least two or more steps and supplying power required for the conversion operation to the image data; and selectively outputting at least two or more types of clocks, Outputting a reference clock required for the conversion operation to the image data, and in synchronization with receiving data from the external device, increasing the maximum power supply capacity required for the conversion operation to the image data; Thereafter, a step of increasing the frequency of the output clock, and receiving the next data after a lapse of a predetermined time after receiving the data from the external device If not, lowering the frequency of the output clock to reduce the maximum power supply capacity required for the conversion operation to the image data. 5. A power supply circuit comprising: a first power supply circuit having a maximum power supply capacity of a first level; and an output unit commonly connected to an output unit of the first power supply circuit; A second having a second level maximum power supply capacity higher than the second level
The second power supply circuit supplies the output power of the output power from the output unit of the second power supply circuit based on a switching signal from the data receiving means or the data conversion means. 5. The data processing method according to claim 4, wherein 6. The data processing method according to claim 4, wherein a print image is formed based on image data output by the conversion operation. 7. A medium recording a program for controlling power consumption during standby according to a data input mode by a computer, the control program causing the computer to receive data from an external device, The received data is converted to image data.In synchronization with receiving data from the external device, the maximum power supply capacity required for the operation of converting to the image data is increased, and then the output is If the next data is not received even after a lapse of a predetermined time from the reception of data from the external device, the frequency of the output clock is decreased, and the frequency of the output clock is reduced. A medium having recorded thereon a data processing control program for reducing a maximum power supply capacity required for a conversion operation. 8. A first power supply circuit having a maximum power supply capacity of a first level, and an output unit commonly connected to an output unit of the first power supply circuit; A second having a second level maximum power supply capacity higher than the second level
The power supply circuit of the second power supply circuit, based on a switching signal from the data reception or the conversion operation to the image data, the output power of the output unit of the second power supply circuit A medium on which a data processing control program according to claim 7, wherein a supply amount is controlled. 9. The medium according to claim 7, wherein a print image is formed based on image data output by the conversion operation. 10. An apparatus for controlling power consumption during standby according to a data input mode, comprising: a receiving unit for receiving data from an external device; and a data for converting the received data into image data. Conversion means; a power supply means for changing the maximum power supply capacity in at least two or more stages and supplying power required for the operation of the data conversion means; and selectively outputting clocks of at least two or more frequencies. A clock output unit that outputs a reference clock necessary for the operation of the data conversion unit; anda maximum power supply capacity of the power supply unit in synchronization with the data reception unit receiving data from the external device. First control means for increasing the frequency and then changing the frequency of the clock output from the clock output means; and If the stage does not receive the next data after a lapse of a predetermined time after receiving data from the external device, the frequency of the clock output from the clock output unit is changed, and the maximum of the power supply unit is changed. A data processing apparatus comprising: a second control unit configured to reduce a power supply capacity. 11. The power supply unit includes: a first power supply circuit having a first level maximum power supply capacity; and an output unit commonly connected to an output unit of the first power supply circuit. And a second higher than the first level
A second power supply circuit having a maximum power supply capacity of a level of the second power supply circuit, based on a switching signal from the data receiving means or the data conversion means. 11. The data processing device according to claim 10, further comprising a unit that controls a supply amount of output power output from the output unit. 12. The image processing apparatus according to claim 10, further comprising an image forming unit that forms a print image based on the image data output from the data conversion unit.
2. The data processing device according to 1. 13. A data processing method for controlling power consumption during standby in accordance with a data input mode, comprising: receiving data from an external device; and converting the received data into image data. Changing the maximum power supply capacity in at least two or more steps and supplying power required for the conversion operation to the image data; and selectively outputting at least two or more types of clocks, Outputting a reference clock required for the conversion operation to the image data, and in synchronization with receiving data from the external device, increasing the maximum power supply capacity required for the conversion operation to the image data; Then, changing the frequency of the output clock; and receiving the next data even after a lapse of a predetermined time after receiving the data from the external device. Changing the frequency of the output clock to reduce the maximum power supply capacity required for the conversion operation to the image data when the communication is not performed. 14. A first power supply circuit having a maximum power supply capacity of a first level, an output unit commonly connected to an output unit of the first power supply circuit, and And a second power supply circuit having a maximum power supply capacity of a second level higher than the second power supply level. 14. The data processing method according to claim 13, wherein a supply amount of output power output from an output unit of the second power supply circuit is controlled. 15. The data processing method according to claim 13, wherein a print image is formed based on the image data output by the conversion operation. 16. A medium storing a program for controlling power consumption during standby according to a data input mode by a computer, the control program causing the computer to receive data from an external device, The received data is converted to image data.In synchronization with receiving data from the external device, the maximum power supply capacity required for the operation of converting to the image data is increased, and then the output is If the next data is not received even after a lapse of a predetermined time after receiving the data from the external device, the frequency of the output clock is changed to change the frequency of the output clock to the image data. A medium storing a data processing control program, characterized in that the maximum power supply capacity required for the conversion operation is reduced. 17. A power supply circuit comprising: a first power supply circuit having a maximum power supply capacity of a first level; and an output unit commonly connected to an output unit of the first power supply circuit; And a second power supply circuit having a maximum power supply capacity of a second level higher than the level, based on a switching signal from the data reception or the conversion operation to the image data, 17. The medium according to claim 16, wherein the supply amount of the output power output from the output unit of the second power supply circuit is controlled. 18. The medium according to claim 16, wherein a print image is formed based on image data output by the conversion operation.