JP2001084054A - Electronic equpment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide electronic equipment to be driven by switching low power consumption operation and high speed operation in accordance with the sorts of power supplies connected by simple constitution. SOLUTION: The electronic equipment is provided with a low power consumption power supply 4, a high speed operation power supply 5 having characteristics different from that of the power supply 4, an oscillation means 3 for generating a clock signal, a control means 1 for receiving power supply from the power supply 4 or 5 and receiving the supply of an operation clock signal from the oscillation means 3, and a frequency changing means 2 of changing the frequency of a clock signal to be supplied to the control means 1 in accordance with the sort of the power supply connected to the control means 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device, and more particularly, to an electronic device having an operation mode that operates at high speed but consumes a large amount of power and an operation mode that consumes low power but operates at a low speed.

[0002]

2. Description of the Related Art Conventionally, as a power source of an electronic device connected to a so-called personal computer or the like, (1) power is directly supplied from the personal computer.
(2) A dedicated power supply device is connected to the electronic device to receive power supply, and (3) a power supply device such as a battery is built in the electronic device. There is also known an electronic device which can be used by appropriately switching its power supply.

In general, when an electronic device operates at a high speed, a user has less time to hold the electronic device.
There are many advantages. For example, digital cameras, scanners, and the like have the advantage of shortening the time for capturing images, and communication devices have the advantage of improving responsiveness and traffic load.

[0004] These high speeds can be realized by, for example, increasing the clock frequency. However, increasing the clock frequency causes a problem of increasing power consumption.
Also, depending on the power supply connected to the electronic device, it is necessary to reduce the power consumption even if the operation speed of the electronic device is suppressed due to the limitation of the power supply capability. For example,
If the power supply is a DC power supply with a commercial AC power supply as input, sufficient operating power can be supplied and the operating speed of the electronic equipment can be increased.However, if the power supply is a battery, the power consumption of the electronic equipment is ensured to ensure battery life. Is desired to be small.

[0005] Under such circumstances, there has been proposed a method and apparatus for controlling the operation speed and power consumption in accordance with the operation state of the electronic equipment, the voltage and current of the connected power supply, or by operating the user. ing. For example, Japanese Patent Application Laid-Open No. 5-19891 discloses a semiconductor device in which the frequency of a clock signal supplied to the device is changed to change the voltage of a power supply and switch between high-speed operation and low power consumption operation. Further, Japanese Patent Application Laid-Open No. Hei 5-235708 discloses that a change in power supply voltage is extracted as a current change,
An operation amplifier circuit and an oscillation circuit that change the oscillation frequency based on the current change value are disclosed.

[0006]

However, in the technique disclosed in Japanese Patent Laid-Open No. Hei 5-19891, if a supplied voltage differs depending on the type of power supply, a circuit for converting the voltage into a constant voltage in a personal computer or the like is provided. Required. In addition, the technique disclosed in Japanese Patent Application Laid-Open No. 5-235708 is inconvenient because the clock frequency is switched when the charge of the battery becomes low, so that it must be constantly monitored.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide an electronic device which operates by switching between low power consumption operation and high speed operation in accordance with the type of power supply connected with a simple configuration. With the goal.

[0008]

In order to achieve the above object, a first electronic apparatus according to the present invention comprises a first power supply, a second power supply having characteristics different from those of the first power supply, and a clock. Oscillating means for generating a signal, control means supplied with power from the first or second power supply, and supplied with an operation clock signal from the oscillating means, and frequency of a clock signal supplied to the control means And frequency changing means for changing the power supply according to the type of power supply connected to the control means.

In order to achieve the above object, a second aspect of the present invention is provided.
The electronic device according to the first aspect, wherein the first electronic device is the first electronic device.
Is a low power consumption power supply which gives priority to driving the control means with low power consumption.

[0010] In order to achieve the above object, a third aspect of the present invention is provided.
The electronic device according to the first aspect, wherein the second electronic device is the second electronic device.
Is a high-speed driving power supply that prioritizes driving the control device at high speed.

[0011]

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

FIG. 1 is a block diagram showing a schematic configuration of an electronic apparatus according to a first embodiment of the present invention.

As shown in FIG. 1, an electronic device 1 of the present embodiment
Reference numeral 00 denotes a control unit 1 that determines the type of the connected power supply, switches the clock frequency, and controls the entire electronic device, and a clock frequency change unit that changes the frequency of the clock signal supplied to the control unit 1. And a oscillating means for generating a clock signal to be supplied to the control means.

A low power consumption power supply 4 as a first power supply and a high-speed operation power supply 5 as a second power supply can be connected to the electronic device 100. Either one or both power supplies can be connected. Is supplied with power.

The low power consumption power supply 4 has a relatively low power supply capability, whereas the high speed operation power supply 5 has a high power supply capability with respect to the low power consumption power supply 4. Let's assume a small battery and a commercial AC power source respectively.

In general, small batteries are small and highly portable, but have a limited power supply capability compared to commercial power supplies. The low power consumption power supply 4 is assumed to be a small battery having such properties. When a battery is used as a power supply, it is desirable that a circuit driven from the viewpoint of battery life and also from the viewpoint of instantaneous current supply capability suppress power consumption. In the present embodiment as well, in consideration of such circumstances, when the low power consumption power supply 4 is connected to the electronic device 100, the control unit 1 operates each circuit with low power consumption driving. The details will be described later.

On the other hand, a commercial power supply is not convenient, but is excellent in terms of current supply capability. By the way, in the case of an electronic device in which the operating speed of a circuit in the device can be changed by changing the frequency of a clock signal or the like, the higher the operation speed, the higher the power consumption, but the higher the power consumption. As described above, when the power supply to the electronic device 100 is the high-speed operation power supply 5 such as a commercial power supply, there is no problem in terms of power supply, so that the circuit can be operated at high speed. Also in the present embodiment, in consideration of such circumstances, when the high-speed operation power supply 5 is connected to the electronic device 100, the control unit 1 controls so as to perform high-speed operation suitable for each circuit. The details will be described later.

FIG. 2 is an electric circuit diagram showing the configuration of the electronic apparatus of the first embodiment in detail. As shown in the figure, a low power consumption power supply 4 (battery E1) as a first power supply or a high-speed operation power supply 5 (commercial power supply E2) as a second power supply can be connected to the electronic device 100 of the present embodiment. It has become.

The high-speed operation power supply 5 is connected to the stabilizing regulator 11 via a smoothing circuit (diode D1, capacitor C1) and a backflow prevention diode D3, while the low power consumption power supply 4 is connected via a backflow prevention diode D2. Connected to the stabilizing regulator 11.

The output of the stabilizing regulator 11 is connected to a CPU (hereinafter, referred to as CPU 1) as a control means 1 and serves as a power source. The output terminal of the transistor 12 for judging the power source type and the power source of the CPU 1 are connected via a resistor R3. Connected to the judgment port.

The transistor 12 functions as a switch for determining the type of power supply, and has its base connected to the output of the smoothing circuit (the cathode of the diode D1) via a resistor R1. Note that a resistor R2 is inserted between the base of the transistor 12 and the ground. Here, the electronic device 10
0 is not connected to the high-speed operation power supply 5 (E2),
Since the transistor 12 is turned off, the power supply determination port of the CPU 1 goes high.

The CPU 1 has a clock switching port and a clock input port. The clock switching port and the clock input port have three NOR circuits No.
r1, Nor2, Nor3, three inverter circuits In
A clock frequency changing circuit (frequency changing means 2) including v1, Inv2, Inv3, and two D-flip-flops Dff1 and Dff2, an oscillator Xtal1 (oscillating means 3), and the like are connected.

That is, one input terminal of the NOR circuit Nor1 is connected to the clock switching port, and the NOR circuit Nor2 is connected via the inverter circuit Inv3.
Is connected to one of the input terminals. Further, the NOR circuit N
The output terminals of or1 and NOR circuit Nor2 are NOR circuit No.
Connected to one input terminal of r3.

The other input terminal of the NOR circuit Nor1 is connected to the oscillator Xtal1 via the inverter circuit Inv2. Further, the other input terminal of the NOR circuit Nor2 is D
Connected to the Q output terminal of flip-flop Dff2.

On the other hand, the output terminal of the inverter circuit Inv2 is connected to the CK terminal of the D-flip-flop Dff1, and the Q output terminal of the D-flip-flop Dff1 is connected to the CK terminal of the D-flip-flop Dff2.

A resistor R4 and an inverter circuit Inv1 are connected in parallel to both ends of the oscillator Xtal1, and both ends of the oscillator Xtal1 are grounded via capacitors C2 and C3.

Next, the difference in power control of the CPU 1 depending on whether or not the high-speed operation power supply 5 (E2) is connected will be described.

First, the case where the high-speed operation power supply 5 is not connected to the electronic device 100 will be described. The CPU 1 detects the level of the power determination port by its internal processing. If the high-speed operation power supply 5 (E2) is not connected to the electronic device 100, the transistor 12 is turned off as described above.
Is at the H level. Thereby, the CP
An H-level signal is output to the clock switching port of U1.

The output signal (H) of the clock switching port is sent to the NOR circuit Nor2 through the NOR circuit Nor1 and the inverter circuit Inv3. This Noah circuit No
The oscillator Xtal1 is connected to one input terminal of r1 via the inverter circuit Inv2 as described above. However, since the clock switching port is at H level, the output of the NOR circuit Nor1 is at L level. Fixed to

As described above, one input terminal of the NOR circuit Nor2 is connected to the Q terminal of the D flip-flop Dff2.
Output is connected. This Q output includes an oscillator Xtal1
Is output to two D-flip-flops Dff1, Dff
The clock signal whose frequency has been reduced to ４ by passing through 2 appears. Therefore, the output of the NOR circuit Nor3 becomes the 1/4 clock frequency of the oscillator Xtal1, and this clock frequency is supplied to the CPU1.

Next, the case where the high-speed operation power supply 5 (E2) is connected to the electronic device 100 will be described. When the high-speed operation power supply 5 is connected, the transistor 12 is turned on, so that the power supply determination port of the CPU 1 goes to L level. The CPU 1 detects the level of the power supply determination port by its internal processing. Since the level is at the L level here, the CPU 1 outputs the L level to the clock switching port.

The output signal (L) of the clock switching port is sent to the NOR circuit Nor2 through the NOR circuit Nor1 and the inverter circuit Inv3. This Noah circuit No
As described above, the oscillator Xtal1 is connected to one input terminal of r1 via the inverter circuit Inv2, but since the clock switching port is at L level, the output of the NOR circuit Nor1 is It becomes the same as Xtal1.

The Q output of the D-flip-flop Dff2 is connected to one input terminal of the NOR circuit Nor2, but the NOR circuit Nor2 has passed through the inverter circuit Inv3.
2 is at the H level, the output of the NOR circuit Nor2 is fixed at the L level. Therefore, the output of the NOR circuit Nor3 is obtained by simply inverting the output of the oscillator Xtal1, and this output is supplied to the CPU1. When the high-speed operation power supply 5 (E2) is connected, the low power consumption power supply 4 (E2) is connected.
The same operation is obtained even if 1) is removed.

As described above, in the electronic apparatus according to the first embodiment, when the connected power supply is a power supply, such as a battery, for which power consumption must be taken into consideration, the oscillation frequency is reduced and each circuit is operated with low power consumption. If the connected power supply is a power supply with excellent power supply capability, such as a commercial power supply, increase the oscillation frequency and drive each circuit at high speed, depending on the type of the connected power supply. The operation can be switched between low power consumption operation and high speed operation.

Next, a second embodiment of the present invention will be described. FIG. 3 is a block diagram illustrating a schematic configuration of an electronic device according to a second embodiment of the present invention.

As shown in FIG. 3, the electronic device 200 according to the second embodiment includes a control unit 1 that determines the type of the connected power supply, switches the clock frequency, and controls the entire electronic device. Oscillating means 6 for generating and sending a clock signal when operating the control means 1 with low power consumption, and high-speed operation for generating and sending a clock signal when operating the control means 1 at high speed Oscillation means 7
And.

As in the first embodiment, the electronic device 200 includes a low power consumption power supply 4 as a first power supply,
A high-speed operation power supply 5 as a second power supply is connectable, and power is supplied from one or both power supplies. Here, the low power consumption power supply 4
Is a power supply having relatively high power supply capability, whereas the high-speed operation power supply 5 is a power supply having relatively high power supply capability,
In this embodiment, a small battery and a commercial power supply are assumed.

FIG. 4 is an electric circuit diagram showing in detail the configuration of the electronic apparatus of the second embodiment. As shown in the figure, the electronic device 200 of the second embodiment has a low power consumption power supply 4 as a first power supply, as in the first embodiment.
(Battery E1) or a high-speed operation power supply 5 (commercial power supply E2) as a second power supply can be connected.

The high-speed operation power supply 5 is connected to the stabilizing regulator 11 via a smoothing circuit (diode D1, capacitor C1) and a backflow prevention diode D3, while the low power consumption power supply 4 is connected via a backflow prevention diode D2. Connected to the stabilizing regulator 11.

The output of the stabilizing regulator 11 is connected to the CPU 1 which is the control means 1 and serves as a power source, and is also connected to the collector terminal of the transistor 12 for judging the type of power source and the power source judging port of the CPU 1 via the resistor R3. .

The transistor 12 functions as a switch for determining the type of power supply, and has its base connected to the output of the smoothing circuit (the cathode of the diode D1) via a resistor R1. Note that a resistor R2 is inserted between the base of the transistor 12 and the ground. Here, the electronic device 20
0 is not connected to the high-speed operation power supply 5 (E2),
Since the transistor 12 is turned off, the power supply determination port of the CPU 1 goes high.

The CPU 1 has a clock switching port and a clock input port. The clock switching port and the clock input port are provided with a circuit corresponding to the oscillation unit 6 for low power consumption operation and the oscillation unit 7 for high speed operation.
Is connected.

The oscillating means 6 for low power consumption operation includes an oscillator Xtal3, analog switches A3 and A4 respectively connected to both ends of the oscillator Xtal3, and capacitors C4 and C5 inserted between the oscillator Xtal3 and ground. Is provided. Each of the switches A3 and A4 is an electronic switch having a control terminal. Both of the control terminals are connected to a clock switching port, and the oscillator Xtal is controlled under the control of the CPU 1.
Switches the three outputs on and off.

An inverter circuit Inv1 and a resistor R4 are connected in parallel to both ends of the oscillator Xtal3 via the switches A3 and A4, and an output of the oscillator Xtal3 is connected to a clock input port of the CPU 1. When the switches A3 and A4 are turned on under the control of the CPU 1, the clock signal of the oscillator Xtal3 is supplied to the clock input port.

On the other hand, the high-speed operation oscillating means 7 includes an oscillator Xtal2 which oscillates a higher frequency than the oscillator Xtal3.
And analog switches A1 and A2 connected to both ends of the oscillator Xtal2, and capacitors C2 and C3 inserted between the ground and the ground. Each of the switches A1 and A2 is an electronic switch having a control terminal. Both of these control terminals are connected to a clock switching port via an inverter circuit Inv4, and under the control of the CPU 1, turn on and off the output of the oscillator Xtal2. Switch.

Both ends of the oscillator Xtal2 are connected to both ends of the inverter circuit Inv1 and the resistor R4 via switches A1 and A2. When the switches A1 and A2 are turned on under the control of the CPU 1, the oscillator Xta
The clock signal 12 is supplied to the clock input port.

Next, in the electronic apparatus according to the second embodiment, the CPU determines whether or not the high-speed operation power supply 5 (E2) is connected.
The difference between the two power controls will be described.

First, a case where the high-speed operation power supply 5 is not connected to the electronic device 200 will be described. The CPU 1 detects the level of the power determination port by its internal processing. If the high-speed operation power supply 5 (E2) is not connected to the electronic device 200, the transistor 12 is turned off as described above.
Is at the H level. Thereby, the CP
An H-level signal is output to the clock switching port of U1. At this time, an H-level signal is input to the control terminals of the switches A3 and A4, and an L-level signal is input to the control terminals of the switches A1 and A2 via the inverter circuit Inv4.

Since an L-level signal is input to the control terminals of the switches A1 and A2, the switch is turned off and the oscillator Xta
The clock signal of l2 is not supplied to the CPU1. On the other hand, since an H level signal is input to the control terminals of the switches A3 and A4, the switches A3 and A4 are turned on, and the clock signal of the oscillator Xtal3 is supplied to the CPU 1. That is, CPU1
Is supplied with a clock signal from the oscillation unit 6 for low power consumption operation.

Next, the case where the high-speed operation power supply 5 (E2) is connected to the electronic device 200 will be described. When the high-speed operation power supply 5 is connected, the transistor 12 is turned on, so that the power supply determination port of the CPU 1 goes to L level. The CPU 1 detects the level of the power determination port through its internal processing. Since the level is at the L level here, an L-level signal is output to the clock switching port. At this time, an L-level signal is supplied to the control terminals of the switches A3 and A4, while the switches A1 and A4
An H level signal is input to the control terminal 2 via the inverter circuit Inv4.

Since an L-level signal is input to the control terminals of the switches A3 and A4, the switches are turned off and the oscillator Xta
The clock signal 13 is not supplied to the CPU 1. On the other hand, since an H level signal is input to the control terminals of the switches A1 and A2, the switches A1 and A2 are turned on, and the clock signal of the oscillator Xtal2 is supplied to the CPU1. That is, CPU1
Is supplied with a clock signal from the oscillation means 7 for high-speed operation.

As described above, in the electronic apparatus according to the second embodiment, when the connected power supply is a power supply such as a battery which must take power consumption into consideration, the oscillation circuit having a relatively low oscillation frequency is operated. Each circuit is driven with low power consumption, while if the connected power supply is a power supply with excellent power supply capability such as a commercial power supply, each circuit is driven at high speed by an oscillation circuit with a relatively high oscillation frequency. By doing so, the operation can be switched between the low power consumption operation and the high speed operation according to the type of the connected power supply.

Next, a third embodiment of the present invention will be described. FIG. 5 is a block diagram showing a configuration of an electronic device according to the third embodiment of the present invention.

The electronic device according to the third embodiment is an electronic device connected to either a parallel port or a USB port of a computer, and switches between low power consumption operation and high speed operation according to the connected port. Features. Further, it is connected to the camera to control the drive and display of the camera, adjust the camera function, diagnose the camera state, and perform abnormal state processing (recovery from an abnormal state, etc.).

As shown in FIG. 5, the electronic device 300 of the third embodiment is connected to the camera 40 to control the driving and display of the camera, adjust the camera function, diagnose the camera state, and process the abnormal state ( A device for performing a recovery from an abnormal state, for example, switching of a clock frequency and the like, and a CPU 21 for controlling the whole of the electronic device, and a power determining circuit 22 for determining a type of power supplied to the electronic device. And CPU2
Oscillation circuit for low power consumption operation (first oscillation circuit) for generating and sending a clock signal when operating 1 with low power consumption
23, a high-speed operation oscillation circuit (second oscillation circuit) 24 for generating and sending a clock signal when the CPU 21 operates at high speed, the first oscillation circuit 23 under the control of the CPU 21, A clock selection circuit 25 for switching the operation with the oscillation circuit 24 of the personal computer;
And a USB connector of the personal computer 30.
A USB port connector 27 connected to the port.

When the electronic device 300 is connected to the parallel port of the personal computer 30, the data output terminals D0 to D7 of the parallel port are set to the H output, and these are collectively used as power supply to the electronic device. . Note that data communication between the personal computer 30 and the electronic device 300 is performed using the remaining signal lines.
These are connected to the signal input / output ports of the CPU 21, respectively.

Here, the current supply capability of the parallel ports D0 to D7 is 2 mA / line, and even if eight lines are combined, the current is only 16 mA. If the electronic device 300 attempts to use a higher current, the voltage drops sharply.
It is necessary to reduce the power consumption so as not to use a current of 16 mA or more. Therefore, the CPU 21 looks at the signal input to the power supply determination input port, and issues a signal from the clock switching output port so as to use the oscillation circuit (first oscillation circuit 23) having a low clock frequency.

The clock selection circuit 25 receives this signal and drives the first oscillation circuit 23, and the second oscillation circuit 24
Stop the operation of. At this time, since the CPU 21 operates in response to the clock signal of the first oscillation circuit 23, operations such as communication with the personal computer 30 and processing inside the CPU 21 are delayed, but the electronic device itself operates with low power consumption.

On the other hand, when the electronic device 300 is connected to the USB port of the personal computer 30,
The power of the electronic device is supplied from a USB port. USB
Can supply current up to 500 mA,
It is not necessary to reduce the power consumption of 0. Therefore, C
The PU 21 looks at the signal input to the power supply determination input port, and checks the oscillation circuit (second oscillation circuit 2) having a high clock frequency.
Send a signal to the clock switch output to use 4).

The clock selection circuit 25 receives this signal and drives the second oscillation circuit 24, and the first oscillation circuit 23
Stop the operation of. At this time, the CPU 21 operates by receiving the clock signal of the second oscillation circuit 24,
00, the communication with the personal computer 30 and the processing inside the CPU 21 are performed at high speed, and the electronic device 300 operates at high speed. The communication between the personal computer 30 and the electronic device 300 is performed by USB.
It is well known to use two signal lines.

As described above, in the electronic apparatus according to the third embodiment, when power is supplied via the parallel port, the oscillation circuits having relatively low oscillation frequencies are operated to drive the circuits with low power consumption. On the other hand, when power is supplied via a USB port, the power is supplied when the power is supplied from a personal computer by driving each circuit at a high speed with an oscillation circuit having a relatively high oscillation frequency. The operation can be switched between low power consumption operation and high speed operation according to the type of power supply.

[Appendix] According to the embodiment of the present invention as described in detail above, the following configuration can be obtained. That is, (1) a first power supply, a second power supply having different characteristics from the first power supply, an oscillating means for generating a clock signal, and power supplied from the first or second power supply, A control unit supplied with an operation clock signal from the oscillation unit; and a frequency changing unit that changes a frequency of the clock signal supplied to the control unit according to a type of a power supply connected to the control unit. An electronic device, comprising:

(2) The electronic apparatus according to (1), wherein the first power supply is a low power consumption power supply in which priority is given to driving the control means with low power consumption.

(3) The electronic apparatus according to (1), wherein the second power supply is a high-speed drive power supply for which priority is given to driving the control device at high speed.

(4) The first power supply is a low-power-consumption power supply whose priority is to drive the control means with low power consumption, and the second power supply is a priority to drive the control means at high speed. The electronic device according to (1), wherein the electronic device is a high-speed drive power supply to be operated.

(5) The electronic device according to any one of (1) to (4), wherein the voltage output from the first power supply is equal to the voltage output from the power supply output from the second power supply.

(6) The electronic device according to any one of (1) to (4), wherein the voltage output from the first power supply is lower than the voltage output from the second power supply.

(7) The electronic device according to any one of (1) to (6), wherein a current that can be supplied by the first power supply and a current that can be supplied by the second power supply are equal.

(8) The electronic device according to any one of (1) to (6), wherein the current that can be supplied by the first power supply is lower than the current that can be supplied by the second power supply.

(9) The electronic apparatus according to any one of (1) to (8), wherein the oscillating means includes the oscillating means for the first power supply and the oscillating means for the second power supply.

(10) The electronic apparatus according to (9), wherein the frequency of the oscillation means for the first power supply is lower than the frequency of the oscillation means for the second power supply.

(11) The frequency changing means selects one of the oscillation means for the first power supply and the oscillation means for the second power supply, wherein (9) to (1)
Electronic equipment according to 0).

(12) The frequency changing means obtains the frequency of the first power supply oscillating means by dividing the frequency of a clock signal generated by the second power supply oscillating means. (9) The electronic device according to (10).

(13) The electronic device according to any one of (1) to (12), which is a device for controlling a camera.

(14) The electronic device according to (13), which is a device for controlling a driving mechanism of a camera.

(15) The electronic device according to (13), wherein the electronic device is a device for controlling a status display of a camera.

(16) The electronic device according to (13), which is a device for controlling a camera adjusting operation.

(17) The electronic device according to (13), which is a device for controlling a state diagnosis of a camera.

(18) The electronic device according to (13), which is a device for controlling an abnormal processing operation of the camera.

[0080]

As described above, according to the present invention, it is possible to provide an electronic device which operates by switching between low power consumption operation and high speed operation according to the type of power supply connected with a simple configuration. it can.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a schematic configuration of an electronic apparatus according to a first embodiment of the invention.

FIG. 2 is an electric circuit diagram specifically showing a configuration of the electronic device of the first embodiment.

FIG. 3 is a block diagram illustrating a schematic configuration of an electronic device according to a second embodiment of the invention.

FIG. 4 is an electric circuit diagram specifically showing a configuration of an electronic device according to the second embodiment.

FIG. 5 is a block diagram showing a configuration of an electronic device according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Control means 2 ... Frequency changing means 3 ... Oscillation means 4 ... Low power consumption power supply 5 ... High speed operation power supply 6 ... Low power consumption operation oscillation means 7 ... High speed operation oscillation means 12 ... Power supply type judgment transistor

Claims (4)

[Claims] A first power supply; a second power supply having different characteristics from the first power supply; an oscillating means for generating a clock signal; and power supplied from the first or second power supply; And,
Control means for supplying an operation clock signal from the oscillating means; and frequency changing means for changing the frequency of the clock signal supplied to the control means in accordance with the type of power supply connected to the control means. Electronic equipment characterized by the above. 2. The electronic apparatus according to claim 1, wherein the first power supply is a low power consumption power supply that gives priority to driving the control unit with low power consumption. 3. The electronic apparatus according to claim 1, wherein the second power supply is a high-speed drive power supply that gives priority to driving the control device at high speed. 4. The electronic device according to claim 1, wherein the device is a device for controlling a camera.