Abstract:
No counter circuit is used but a simple arrangement is used to allow a motor to be rotation driven by main drive pulses in accordance with a load. A control circuit ( 103 ), after starting to use second main drive pulses to drive a motor ( 105 ), continues the rotation driving of the motor ( 105 ) by use of the second main drive pulses if a rotation detecting circuit ( 110 ) detects a rotation detection signal indicative of the rotation of the motor ( 105 ) after a passage of a predetermined reference time period. However, the control circuit ( 103 ) uses first main drive pulses, which are shorter in pulse width than the second main drive pulses, instead of using the second main drive pulses, to perform the rotation driving of the motor ( 105 ) if the rotation detection signal is detected before the passage of the reference time period. Alternatively, the control circuit ( 103 ) uses correction drive pulses, which are the longest in pulse width, to perform a forced rotation driving of the motor ( 105 ) if no rotation detection signal is detected. Thereafter, the control circuit ( 103 ) uses the first main drive pulses to perform the rotation driving of the motor.

Description:
BACKGROUND OF THE INVENTION  
       [0001]     1. Field of the Invention  
         [0002]     The present invention relates to an analogue electronic clock and a motor control circuit which is suitably applicable to an analogue electronic clock or the like.  
         [0003]     2. Description of the Prior Art  
         [0004]     Conventionally, an analogue electronic clock which is configured to rotationally drive time hands for displaying time such as a hour hand, a minute hand and the like using a motor has been used. The analogue electronic clock includes the motor which rotationally drives the time hands and a motor control circuit which controls the rotation of the motor, wherein by rotationally driving the motor by the motor control circuit based on time signals which constitute references of time, the time hands can perform a time display.  
         [0005]     In the electronic clock which is described in JP-B-61-15385, for rotationally driving the motor which serves to drive the time hands, the motor is rotationally driven by selectively using a plurality of main drive pulses, and when a rotation detection circuit detects that the motor is not rotated, the motor is rotationally driven using an auxiliary drive pulse having a larger pulse width than widths of the above-mentioned respective main drive pulses thus realizing the rotational driving with minimum energy corresponding to a motor load.  
         [0006]     For example, a load such as an electronic clock calendar cannot be driven with the main drive pulse having a minimum pulse width (minimum energy) and hence, after performing the rotational driving with the correction drive pulse temporarily, the rotational driving is performed by changing the main drive pulse to the main drive pulse having the larger energy (the larger pulse width) than the minimum energy drive pulse (pulse-up).  
         [0007]     When the large load is continued, the rotational driving with the main drive pulse having the large pulse width which is proportional to the load is continued. When the large load disappears and the load becomes small, upon detecting that the motor is stably driven for a fixed time with the drive pulse, the motor is rotationally driven by changing the main drive pulse to the main drive pulse having small energy (small pulse width) (pulse-down) thus realizing the low power consumption.  
         [0008]     However, in performing the pulse-down along with the decrease of the load, the motor is configured such that when the motor is stably driven with the main drive pulses by predetermined times at this point of time, the pulse-down is performed. Accordingly, the fact that the normal rotational drive operation with the main drive pulse at this point of time is continuously performed predetermined times is counted by a counter circuit, and when the counter circuit counts the rotational drive operation the above-mentioned predetermined times, the pulse-down is performed thus changing the main pulse width to the main drive pulse having the pulse width corresponding to the magnitude of the load.  
         [0009]     Accordingly, the counter circuit is necessary in the analogue electronic clock and hence, in an attempt to form only an electronic circuit which constitutes a motor control circuit or an electronic circuit which constitutes an electronic clock including the motor control circuit into an integrated circuit (IC), there exists a drawback that an IC chip size cannot be reduced.  
         [0010]     Further, the pulse width to be changed, the pulse-width changing timing and the like in performing the pulse-down differ for respective products and hence, there exists a drawback that the circuit constitution becomes complicated to cope with the respective products.  
         [0011]     Further, in performing the pulse-down, it is necessary to perform the rotational driving with the main drive pulse having the pulse width larger than the necessary pulse width predetermined times and hence, there exists a drawback that the power consumption is increased. Accordingly, in an electronic clock or the like which uses a battery as a power source, there arises a drawback that the battery lifetime becomes short and the number of battery change is increased thus making the battery changing operation cumbersome.  
         [0012]     It is an object of the present invention to provide a motor control circuit which can rotationally drive a motor with a main drive pulse having a pulse width corresponding to a motor load with the simple constitution without using a counter circuit.  
         [0013]     Further, it is an object of the present invention to provide a motor control circuit which can realize the low power consumption.  
         [0014]     Further, it is an object of the present invention to provide an analogue electronic clock which can rotationally drive a motor with a main drive pulse having a pulse width corresponding to a motor load with the simple constitution without using a counter circuit.  
         [0015]     Further, it is an object of the present invention to provide an analogue electronic clock which can realize the low power consumption.  
       SUMMARY OF THE INVENTION  
       [0016]     According to the present invention, there is provided a motor control circuit which includes: a rotation detection means which detects a rotation detection signal in response to a rotation of a motor and detects whether the motor is rotated or not based on the rotation detection signal; and a control means which selects a main drive pulse corresponding to a magnitude of a load of the motor out of a plurality of main drive pulses which differ in energy from each other and drives the motor with the selected main drive pulse and, at the same time, when the rotation detection means detects that the motor is not rotated by the rotational driving with the main drive pulse based on the rotation detection signal, forcibly rotationally drives the motor with a correction drive pulse having energy larger than respective main drive pulses, wherein  
         [0017]     the control means selects any one of the main drive pulses out of the plurality of main drive pulses based on the relationship of a magnitude between a time until the rotation detection signal which is indicative of the rotation of the motor is detected by the rotation detection means and a predetermined reference time, and rotationally drives the motor based on the selected main drive pulse.  
         [0018]     A control means selects any one of main drive pulses out of a plurality of main drive pulses based on the relationship of a magnitude between a time until a rotation detection signal which is indicative of a rotation of a motor is detected by a rotation detection means and a predetermined reference time, and rotationally drives the motor based on the selected main drive pulse.  
         [0019]     Here, the control means may be configured such that the control means, in rotationally driving the motor with the main drive pulse, when the rotation detection signal which is indicative of the rotation of the motor is detected by the rotation detection means after a lapse of the reference time, rotationally drives the motor without changing the main drive pulse.  
         [0020]     Further, the control means may be configured such that the control means, in rotationally driving the motor with the main drive pulse, when the rotation detection signal which is indicative of the rotation of the motor is detected by the rotation detection means before a lapse of the reference time, selects the main drive pulse having smaller energy than the main drive pulse used for the rotational driving and rotationally drives the motor with the selected main drive pulse.  
         [0021]     Further, according to the present invention, there is provided a motor control circuit which includes: a rotation detection means which detects a rotation detection signal in response to a rotation of a motor and detects whether the motor is rotated or not based on the rotation detection signal; and a control means which selects a main drive pulse corresponding toga magnitude of a load of the motor out of a plurality of main drive pulses which differ in energy from each other and rotationally drives the motor and, at the same time, when the rotation detection means detects that the motor is not rotated by the rotational driving with the main drive pulse based on the rotation detection signal, forcibly rotationally drives the motor with a correction drive pulse having energy larger than respective main drive pulses, wherein  
         [0022]     the control means, in driving the motor with the first main drive pulse having a first pulse width, when the rotation detection signal which is indicative of the rotation of the motor is detected by the rotation detection means, continues the rotational driving of the motor with the first main drive pulse and, at the same time, when the rotation detection signal which is indicative of the rotation of the motor is not detected by the rotation detection means, rotationally drives the motor with the correction drive pulse and, thereafter, rotationally drives the motor with the second main drive pulse having a larger pulse width than the first main drive pulse,  
         [0023]     the control means, in driving the motor with the second main drive pulse, when the rotation detection signal which is indicative of the rotation of the motor is detected by the rotation detection means and the rotation detection signal which is indicative of the rotation of the motor is detected by the rotation detection means after a lapse of a predetermined reference time, continues the rotational driving of the motor with the second main drive pulse,  
         [0024]     the control means, in driving the motor with the second main drive pulse, when the rotation detection signal which is indicative of the rotation of the motor is detected by the rotation detection means and the rotation detection signal which is indicative of the rotation of the motor is detected by the rotation detection means before a lapse of the predetermined reference time, changes the rotational driving of the motor with the first main drive pulse, and  
         [0025]     the control means, in driving the motor with the second main drive pulse, when the rotation detection signal which is indicative of the rotation of the motor is not detected by the rotation detection means, rotationally drives the motor with the first main drive pulse after the motor is rotationally driven with the correction drive pulse.  
         [0026]     A control means, in driving a motor with a first main drive pulse having a first pulse width, when a rotation detection signal which is indicative of the rotation of the motor is detected by a rotation detection means, continues the rotational driving of the motor with a first main drive pulse and, at the same time, when the rotation detection signal which is indicative of the rotation of the motor is not detected by the rotation detection means, rotationally drives the motor with a correction drive pulse and, thereafter, rotationally drives the motor with a second main drive pulse having a larger pulse width than the first main drive pulse,  
         [0027]     the control means, in driving the motor with the second main drive pulse, when the rotation detection signal which is indicative of the rotation of the motor is detected by the rotation detection means and the rotation detection signal which is indicative of the rotation of the motor is detected by the rotation detection means after a lapse of a predetermined reference time, continues the rotational driving of the motor with the second main drive pulse,  
         [0028]     the control means, in driving the motor with the second main drive pulse, when the rotation detection signal which is indicative of the rotation of the motor is detected by the rotation detection means and the rotation detection signal which is indicative of the rotation of the motor is detected by the rotation detection means before a lapse of the predetermined reference time, changes the rotational driving of the motor with the first main drive pulse, and  
         [0029]     the control means, in driving the motor with the second main drive pulse, when the rotation detection signal which is indicative of the rotation of the motor is not detected by the rotation detection means, rotationally drives the motor with the first main drive pulse after the motor is rotationally driven with the correction drive pulse.  
         [0030]     Further, the control means may be configured such that, the control means, in rotationally driving the motor with the main drive pulse having small energy, when the rotation detection signal which is indicative of the rotation of the motor is detected by the rotation detection means before a lapse of a first reference time, rotationally drives the motor without changing the main drive pulse.  
         [0031]     Further, the control means may be configured such that the control mean&#39;s, in rotationally driving the motor with the main drive pulse having small energy, when the rotation detection signal which is indicative of the rotation of the motor is detected by the rotation detection means after a lapse of the first reference time, changes the drive pulse such that the control means rotationally drives the motor with the main drive pulse having the larger energy than the main drive pulse.  
         [0032]     Further, the control means may be configured such that the control means, in rotationally driving the motor with the main drive pulse having large energy, when the rotation detection signal which is indicative of the rotation of the motor is detected by the rotation detection means before a lapse of a second reference time, changes the drive pulse such that the control means rotationally drives the motor with the main drive pulse having the smaller energy than the main drive pulse.  
         [0033]     Further, the control means may be configured such that the control means, in rotationally driving the motor with the main drive pulse having large energy, when the rotation detection signal which is indicative of the rotation of the motor is detected by the rotation detection means after a lapse of the second reference time, rotationally drives the motor without changing the main drive pulse.  
         [0034]     Further, the control means may be configured such that the control means, in rotationally driving the motor with the main drive pulse, when the rotation detection signal which is indicative of the motor is not detected by the rotation detection means, rotationally drives the motor with the correction drive pulse.  
         [0035]     Further, according to the present invention, there is provided a motor-control circuit which includes: a rotation detection means which detects a rotation detection signal in response to a rotation of a motor and detects whether the motor is rotated or not based on the rotation detection signal; and a control means which selects a main drive pulse corresponding to a magnitude of a load of the motor out of a plurality of main drive pulses which differ in energy from each other and rotationally drives the motor and, at the same time, when the rotation detection means detects that the motor is not rotated by the rotational driving with the main drive pulse based on the rotation detection signal, forcibly rotationally drives the motor with a correction drive pulse having energy larger than respective main drive pulses, wherein  
         [0036]     the control means, in rotationally driving the motor with the first main drive pulse having a first pulse width, when the rotation detection signal which is indicative of the rotation of the motor is detected by the rotation detection means before a lapse of a first reference time, rotationally drives the motor without changing the main drive pulse,  
         [0037]     the control means, in rotationally driving the motor with the first main drive pulse, when the rotation detection signal which is indicative of the rotation of the motor is detected by the rotation detection means after a lapse of the first reference time, changes the drive pulse such that the motor is rotationally driven with the second main drive pulse having larger energy than the first main drive pulse,  
         [0038]     the control means, in rotationally driving the motor with the second main drive pulse, when the rotation detection signal which is indicative of the rotation of the motor is detected by the rotation detection means before a lapse of a second reference time, changes the drive pulse such that the motor is rotationally driven with the first main drive pulse,  
         [0039]     the control means, in rotationally driving the motor with the second main drive pulse, when the rotation detection signal which is indicative of the rotation of the motor is detected by the rotation detection means after a lapse of the second reference time, rotationally drives the motor without changing the main drive pulse, and  
         [0040]     the control means, in rotationally driving the motor with the first or second main drive pulse, when the rotation detection signal which is indicative of the rotation of the motor is not detected by the rotation detection means, rotationally drives the motor with the correction driving pulse.  
         [0041]     A control means, in rotationally driving a motor with a first main drive pulse having a first pulse width, when a rotation detection signal which is indicative of the rotation of the motor is detected by the rotation detection means before a lapse of a first reference time, rotationally drives the motor without changing the main drive pulse,  
         [0042]     the control means, in rotationally driving the motor with the first main drive pulse, when the rotation detection signal which is indicative of the rotation of the motor is detected by the rotation detection means after a lapse of the first reference time, changes the drive pulse such that the motor is rotationally driven with a second main drive pulse having larger energy than the first main drive pulse,  
         [0043]     the control means, in rotationally driving the motor with the second main drive pulse, when the rotation detection signal which is indicative of the rotation of the motor is detected by the rotation detection means before a lapse of a second reference time, changes the drive pulse such that the motor is rotationally driven with the first main drive pulse,  
         [0044]     the control means, in rotationally driving the motor with the second main drive pulse, when the rotation detection signal which is indicative of the rotation of the motor is detected by the rotation detection means after a lapse of the second reference time, rotationally drives the motor without changing the main drive pulse, and  
         [0045]     the control means, in rotationally driving the motor with the first or second main drive pulse, when the rotation detection signal which is indicative of the rotation of the motor is not detected by the rotation detection means, rotationally drives the motor with a correction driving pulse.  
         [0046]     The first and second reference times may be set to an equal time.  
         [0047]     Further, according to the present invention, there is provided an analogue electronic clock which includes: a motor which rotationally drives a clock hand; and a motor control circuit which performs a time counting operation in response to a time signal which constitutes a reference of time and controls the rotation of the motor, the analogue electronic clock is capable of performing a time display using the clock hand by rotationally driving the motor by the motor control circuit, wherein  
         [0048]     the motor control circuit is constituted of the motor control circuit described in any one of claims. 
     
    
     BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS  
       [0049]     A preferred form of the present invention is illustrated in the accompanying drawings in which:  
         [0050]      FIG. 1  is a block diagram of an analogue electronic clock according to an embodiment of the present invention;  
         [0051]      FIG. 2  is a constitutional view of a stepping motor used in the analogue electronic clock according to the embodiment of the present invention;  
         [0052]      FIG. 3  are timing charts showing an operation of the analogue electronic clock according to the embodiment of the present invention;  
         [0053]      FIG. 4  is a flow chart showing the manner of operation of the analogue electronic clock according to an embodiment of the present invention;  
         [0054]      FIG. 5  is a timing chart showing an operation of the analogue electronic clock according to the embodiment of the present invention;  
         [0055]      FIG. 6  is timing chart showing an operation of the analogue electronic clock according to another embodiment of the present invention;  
         [0056]      FIG. 7  is a flow chart showing the manner of operation of the analogue electronic clock according to an embodiment of the present invention; and  
         [0057]      FIG. 8  are timing charts showing the operation of the analogue electronic clock according to another embodiment of the present invention. 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0058]      FIG. 1  is a block diagram of an analogue electronic clock according to an embodiment of the present invention and shows an example of an analogue electronic wrist watch.  
         [0059]     In  FIG. 1 , the electronic clock includes an oscillation circuit  101  which oscillates a signal of a predetermined frequency, a frequency dividing circuit  102  which generates clock signals which become references at the time of timer counting by dividing a signal generated by the oscillation circuit  101 , a control circuit  103  which performs controls such as a control of respective electronic circuit components which constitute the electronic clock, a change control of drive pulses and the like, a drive pulse selection circuit  104  which selects and outputs a drive pulse for motor rotational driving based on a control signal from the control circuit  103 , a motor  105  which is rotationally driven based on the drive pulse from the drive pulse selection circuit  104 , an analogue display part  106  which includes time hands (three kinds of time hands consisting of an hour hand  107 , a minute hand  108 , a second hand  109  in the example shown in  FIG. 1 ) which are rotationally driven by the motor  105  and indicate the time, a rotation detection circuit  110  which detects a rotation detection signal which expresses a rotation state from the motor  105 , and a detection time determination circuit  111  which determines a magnitude relationship between a time from a predetermined time (for example, a point of time at which the supply of the drive pulse to the motor  105  is started or a point of time at which the supply of the drive pulse is finished) to a point of time at which a rotation detection signal which is indicative of the rotation of the motor  105  detects and a predetermined reference time.  
         [0060]     The rotation detection circuit  110  has the constitution substantially equal to the constitution of the rotation detection circuit described in the above-mentioned JP-B-61-15385 and is configured such that the rotation detection circuit  110  can detect the rotation detection signal of a level which exceeds a predetermined reference signal voltage Vcomp when the motor  105  is rotated and cannot detect the rotation detection signal of the level which exceeds the above-mentioned predetermined reference signal voltage Vcomp when the motor  105  is not rotated.  
         [0061]     Here, the control circuit  103 , the drive pulse selection circuit  104 , the rotation detection circuit  110  and the detection time determination circuit  111  constitute a motor control circuit. Further, the control circuit  103 , the rotation detection circuit  110  and the detection time determination circuit  111  constitute a rotation detection means, and the control circuit  103 , the drive pulse selection circuit  104 , the rotation detection circuit  110  and the detection time determination circuit  111  constitute a control means.  
         [0062]      FIG. 2  is a constitutional view of the motor  105  used in the embodiment of the present invention and shows an example of a clock-use stepping motor which is generally used in an analogue electronic clock.  
         [0063]     In  FIG. 2 , the motor  105  includes a stator  201  which has a rotor housing through hole  203 , a rotor  202  which is rotationally disposed in the rotor housing through hole  203 , a magnetic core  208  which is integrally formed with the stator  201 , and a coil  209  which is wound around the magnetic core  208 . In using the motor  105  in the electronic clock, the stator  201  and the magnetic core  208  are fixedly mounted on a dial plate (not shown in the drawing) using small bolts (not shown in the drawing).  
         [0064]     The rotor  202  is polarized in two poles (S pole and N pole). In an outer end portion of the stator  201  which is formed of a magnetic material, a plurality of (two in this embodiment) cutout portions (outer notches)  206 ,  207  are formed at positions which face each other with the rotor housing through hole  203  sandwiched there between. Saturable portions  210 ,  211  are formed between the respective outer notches  206 ,  207  and the rotor housing through hole  203 .  
         [0065]     The saturable portions  210 ,  211  are configured such that the saturable portions  210 ,  211  are not magnetically saturated with a magnetic flux of the rotor  202  but are magnetically saturated when the coil  209  is excited and increase magnetic resistance thereof. The rotor housing through hole  203  has a profile thereof formed in a circular shape in which a plurality of (two in this embodiment) half-moon like cut out portions (inner notches)  204 ,  205  are formed integrally in opposedly facing portions of a circular through hole.  
         [0066]     The cutout portions  204 ,  205  form positioning portions which determine a stop position of the rotor  202 . In a state that the coil  209  is not excited, the rotor  202  is, as shown in  FIG. 2 , stably stopped at a position corresponding to the positioning portions as shown in  FIG. 2 , that is, the positions at which a magnetic pole axis A of the rotor  202  is orthogonal to a line segment which connects the cutout portions  204 ,  205 .  
         [0067]     Here, when a drive pulse having a square wave shape is supplied to the coil  209  from the drive pulse selection circuit  104  so that an electric current “i” is made to flow in the arrow direction in  FIG. 2 , a magnetic flux is generated in the stator  201  in the arrow direction indicated by a broken line. Accordingly, the saturable portions  210 ,  211  are saturated and the magnetic resistance thereof is increased and, thereafter, due to an interaction between a magnetic pole generated by the stator  201  and a magnetic pole generated by the rotor  202 , the rotor  202  is rotated by 180° in the direction indicated by an arrow in  FIG. 2  and is stably stopped.  
         [0068]     Next, when a inverse-polarity drive pulse having a square wave shape is supplied to the coil  209  from the drive pulse selection circuit  104  so that an electric current is made to flow in the direction opposite to the arrow direction in  FIG. 2 , a magnetic flux is generated in the stator  201  in the direction opposite to the arrow direction indicated by the broken line. Accordingly, the saturable portions  210 ,  211  are firstly saturated and, thereafter, due to an interaction between a magnetic pole generated by the stator  201  and a magnetic pole generated by the rotor  202 , the rotor  202  is rotated by 180° in the same direction as the above-mentioned direction and is stably stopped.  
         [0069]     Thereafter, by supplying signals which differ in polarities (AC signals) to the coil  209 , the above-mentioned operation is repeatedly performed thus realizing the continuous rotation of the rotor  202  in the direction indicated by the arrow for every 180 degrees. Here, in this embodiment, as the drive pulse, as described later, a plurality of main drive pulses P 11 , P 12  and a correction drive pulse P 2  are used.  
         [0070]      FIG. 3  is a timing chart showing a plurality of (two kinds in this embodiment) main drive pulses (the first main drive pulse P 11  having a first pulse width, the second main drive pulse P 12  having a second pulse width) used in this embodiment and a rotation detection signal which expresses whether the motor  105  is rotated or not in this embodiment.  
         [0071]     In  FIG. 3 , the main drive pulses P 11 , P 12  are pulse signals which have a square wave shape which differ in drive energy (pulse width in this embodiment) from each other, and the main drive pulse P 11  has the smaller energy than the main drive pulse P 12 , in other words, has the smaller pulse width than the main drive pulse  12 . As described later, the correction drive pulse P 2  having a third pulse width is configured to possess the larger energy (larger pulse width) than the main drive pulses P 11 , P 12 . That is, the respective drive pulses P 11 , P 12 , P 2  have the respective pulse widths thereof set in order of P 11 &lt;P 12 &lt;P 2 .  
         [0072]     Out of the rotation detection signals shown in  FIG. 3 , the rotation detection signals S 1 , S 2  of levels which exceed the predetermined reference signal voltage Vcomp are rotation detection signals which are indicative of the rotation of the motor  105 , while the rotation detection signals of levels which are equal to or below the predetermined reference signal voltage Vcomp are rotation detection signals which are detected when the motor  105  is not rotated.  
         [0073]     Here, the main drive pulses P 11 , P 12  are drive pulses for continuously rotationally driving the motor  105 , while the correction drive pulse P 2  is a drive pulse which is temporarily used for forcibly rotationally driving the motor  105  when a load of the motor  105  is increased so that the motor  105  cannot be rotationally driven with the main drive pulses P 11 , P 12 .  
         [0074]     Although explained in detail later, this embodiment is made by focusing on a following phenomenon. That is, when the pulse width of the main drive pulse is proper or large compared to a magnitude of a load of the motor  105 , the motor  105  is rotated fast and hence, the rotation detection signal which is indicative of the rotation of the motor  105  is generated at an early time, when the pulse width of the main drive pulse is small compared to the magnitude of the load of the motor  105 , the motor  105  is rotated gently and hence, the rotation detection signal which is indicative of the rotation of the motor  105  is generated at a delayed time, and when the pulse width of the main drive pulse is excessively small compared to the magnitude of the load of the motor  105 , the motor  105  is not rotated and hence, the rotation detection signal which is indicative of the rotation of the motor  105  is not generated. That is, this embodiment is configured to select either one of the plurality of main drive pulses P 11 , P 12  based on the magnitude relationship between time from a predetermined reference time (in  FIG. 3 , a point of time that the supply of the main drive pulses P 11 , P 12  to the motor  105  is finished in  FIG. 3 ) to a point of time at which the rotation detection signal which is indicative of the rotation of the motor  105  is detected by a rotation detection circuit  110  and a predetermined reference time “t” and rotationally drives the motor  105  with the selected main drive pulse.  
         [0075]     That is, this embodiment is configured such that either one of the plurality of main drive pulses P 11 , P 12  is selected corresponding to the magnitude of the load and the motor  105  is driven with the selected main drive pulse, wherein when the load is small, the motor  105  is rotationally driven with the main drive pulse P 11  and when the load is large so that the motor  105  is not rotationally driven with the main drive pulse P 1 , the motor  105  is rotationally driven with the main drive pulse P 12 .  
         [0076]     In rotationally driving the motor  105  with the main drive pulse P 11 , when it is determined by the detection time determination circuit  111  that the rotation detection signal S 1  which is indicative of the rotation of the motor  105  is generated at the point of time earlier than the predetermined reference time “t” (within T 1 ), that is, when the rotation detection signal S 1  which is indicative of the rotation of the motor  105  is detected by the rotation detection circuit  110  before the predetermined reference time “t” elapse&#39;s, the control circuit  103  determines that the rotational driving is performed with proper energy for the load of the motor  105  and continues the rotational driving of the motor  105  with the main drive pulse P 11 .  
         [0077]     In rotationally driving the motor  105  with the main drive pulse P 12 , when it is determined by the detection time determination circuit  111  that the rotation detection signal S 2  which is indicative of the rotation of the motor  105  is generated at the point of time later than the predetermined reference time “t” (within T 2 ), that is, when the rotation detection signal S 2  which is indicative of the rotation of the motor  105  is detected by the rotation detection circuit  110  after the predetermined reference time “t” elapses, the control circuit  103  determines that the rotational driving is performed with the main drive pulse. P 12  proper for the load of the motor  105  and continues the rotational driving of the motor  105  with the main drive pulse P 12 .  
         [0078]     On the other hand, in rotationally driving the motor  105  with the main drive pulse P 12 , when it is determined by the detection time determination circuit  111  that the rotation detection signal S 1  which is indicative of the rotation of the motor  105  is generated at the point of time earlier than the predetermined reference time “t” (within T 1 ), that is, when the rotation detection signal which is indicative of the rotation of the motor  105  is detected by the rotation detection circuit  110  before the predetermined reference time “t” elapses, the control circuit  103  determines that the motor  105  is driven with the main drive pulse P 12  which has the large energy compared to the load of the motor  105 , that is, energy is wasted and performs the selection changeover of the main drive pulse (pulse-down) to rotationally drive the motor  105  with the main drive pulse P 11 , and performs a control such that the motor  105  is rotationally driven with the newly selected main drive pulse P 11 .  
         [0079]      FIG. 4  is a flowchart showing the manner of operation. Of the analogue electronic clock according to this embodiment of the present invention and is mainly a flowchart showing processing of the control circuit  103 .  
         [0080]      FIG. 5  is a timing chart showing the manner of operation of the analogue electronic clock according to this embodiment of the present invention.  
         [0081]     Hereinafter, in conjunction with  FIG. 1  to  FIG. 5 , the manner of operation of the analogue electronic clock according to this embodiment of the present invention and the manner of operation of the motor control circuit suitably applicable to the analogue electronic clock are explained.  
         [0082]     In  FIG. 1 , the oscillation circuit  101  generates the reference clock signal having the predetermined frequency, and the frequency dividing circuit  102  generates clock signals which become the references of timer counting by dividing the frequency of the above-mentioned signal generated by the oscillation circuit  101  and outputs the clock signals to the control circuit  103 .  
         [0083]     First of all, the usual drive operation (see  FIG. 5A ) in which the motor load is small and the motor  105  is rotationally driven with the main drive pulse P 11  is explained.  
         [0084]     In this case, firs to fall, the control circuit  103  performs the timer counting by counting the above-mentioned time signals and, at predetermined timing, generates a control signal for rotationally driving the motor  105  with the first main drive pulse P 11  having the short pulse width (step S 401  in  FIG. 4 ).  
         [0085]     The drive pulse selection circuit  104 , in response to the control signal from the control circuit  103 , rotationally drives the motor  105  with the main drive pulse P 11 . The motor  105  is rotationally driven with the main drive pulse P 11  and rotationally drives the time hands  107  to  109 . Accordingly, the display part  106  sequentially displays the present time using the time hands  107  to  109 .  
         [0086]     The rotation detection circuit  110  detects the rotation detection signal which is indicative of a rotation state from the motor  105  and outputs the rotation state to the detection time determination circuit  111 . The detection time determination circuit  111  compares the rotation detection signal from the rotation detection circuit  110  and the predetermined reference signal voltage Vcomp, determines whether the rotation detection signal voltage exceeds the predetermined reference signal voltage Vcomp or not, that is, whether the motor  105  is rotated or not, and notifies whether the motor  105  is rotated or not to the control circuit  103 . Further, when the detection time determination circuit  111  detects the rotation detection signal which exceeds the above-mentioned reference signal voltage Vcomp, the detection time determination circuit  111  compares the time from the completion of supply of the main drive pulse P 11  to the motor  105  to the point of time that the rotation detection signal is generated with the predetermined reference time “t”, and notifies whether the time to the point of time that the rotation detection signal is generated is larger than the reference time “t” or not to the control circuit  103 .  
         [0087]     The control circuit  103 , based on the information from the detection time determination circuit  111 , determines whether the voltage of the rotation detection signal exceeds the reference signal voltage. Vcomp or not, that is, whether the motor  105  is rotated or not (step S 402 ).  
         [0088]     When the control circuit  103  determines that the rotation detection signal voltage exceeds the reference signal voltage Vcomp, that is, the motor  105  is rotated in step S 402 , this implies that the load of the motor  105  is of a magnitude which allows the driving of the motor  105  with the main drive pulse P 11 . Accordingly, the processing returns to step S 401  and the control circuit  103  outputs the control signal for continuously rotationally driving the motor  105  with the main drive pulse P 11  to the drive pulse selection circuit  104 . The drive pulse selection circuit  104  continuously rotationally drives the motor  105  with the main drive pulse P 11  in response to the control signal from the control circuit  103 . By repeating the above-mentioned steps, the usual drive operation is performed.  
         [0089]     Next, the pulse-up operation is explained ( FIG. 5B ). When the control circuit  103  determines that the rotation detection signal voltage does not exceed the reference signal voltage Vcomp, that is, the motor  105  is not rotated in step S 402 , this implies that the load of the motor  105  is not of a magnitude which allows the driving of the motor  105  with the main drive pulse P 11 . Accordingly, the control circuit  103  outputs the control signal for rotationally driving the motor  105  with the correction drive pulse P 2  temporarily to the drive pulse selection circuit  104  (step S 403 ).  
         [0090]     The drive pulse selection circuit  104  rotationally drives the motor  105  with the correction drive pulse P 2  in response to the above-mentioned control signal from the control circuit  103 . Accordingly, the motor  105  which is not driven with the main drive pulse P 11  is driven and rotated with the correction drive pulse P 2  which immediately follows the main drive pulse P 11 .  
         [0091]     When the load of the motor  105  is increased extremely momentarily, by performing the driving of the motor  105  with the main drive pulse P 11  in the next step, there is enough possibility that the motor  105  is rotated. However, in general, the possibility that the motor  105  is rotationally driven is small and hence, in the next step, the control circuit  103  performs a control such that the motor  105  is rotationally driven with the main drive pulse P 12  to ensure the rotation in a more reliable manner (step S 404 ). The drive pulse selection circuit  104  rotationally drives the motor  105  with the main drive pulse P 12  under the control of the control circuit  103 .  
         [0092]     Next, the pulse-down operation is explained (see  FIG. 5 ( c )). The control circuit  103 , after rotationally driving the motor  105  with the main drive pulse P 12  in step S 404 , determines whether the rotation detection signal voltage exceeds the reference signal voltage Vcomp or not, that is, the motor  105  is rotated or not based on the information from the detection time determination circuit  111  (step S 405 ).  
         [0093]     When the control circuit  103  determines that the rotation detection signal voltage does not exceed the reference signal voltage Vcomp, that is, the motor  105  is not rotated in step S 405 , this implies that the load of the motor  105  is not of a magnitude which allows the driving of the motor  105  with the main drive pulse P 12 . Accordingly, the control circuit  103  outputs the control signal for rotationally driving the motor  105  with the correction drive pulse P 2  temporarily to the drive pulse selection circuit  104  (step S 406 ). The drive pulse selection circuit  104  rotationally drives the motor  105  with the correction drive pulse P 2  in response to the above-mentioned control signal from the control circuit  103 . Accordingly, the motor  105  which is not driven with the main drive pulse P 12  is driven and rotated with the correction drive pulse P 2  which immediately follows the main drive pulse P 12 . The load of the motor  105  is temporarily increased, and once the motor  105  is rotated, there exists a possibility that the load is decreased. Accordingly, the control circuit  103 , after executing the processing in step S 406 , returns to step S 401  and performs the rotational drive control of the motor  105  with the main drive pulse P 11 .  
         [0094]     When the control circuit  103  determines that the rotation detection signal voltage exceeds the reference signal voltage Vcomp, that is, the motor  105  is rotated in step S 405 , the control circuit  103  compares the time from the completion of supply of the main drive pulse P 12  to the motor  105  to the point of time that the rotation detection signal is generated with the reference time “t” and determines whether the time to the point of time that the rotation detection signal is generated is longer than the predetermined reference time “t” or not (that is, whether the time to the point of time that the rotation detection signal is generated falls within the time T 1  side before the reference time “t” or within the time T 2  side after the reference time “t”) (step S 407 ).  
         [0095]     When the control circuit  103  determines that the time from the completion of supply of the main drive pulse P 12  to the motor  105  to the point of time that the rotation detection signal is generated is longer than the reference time “t”, the control circuit  103  determines that the load of the motor  105  is of a magnitude which is proper to perform the rotational driving of the motor  105  with the main drive pulse P 12 . Accordingly, the control circuit  103  returns to step S 404  and the control circuit  103  continues the rotational driving of the motor  105  with the main drive pulse P 12 .  
         [0096]     On the other hand, when the control circuit  103  determines that the time from the completion of supply of the main drive pulse P 12  to the motor  105  to the point of time that the rotation detection signal is generated is shorter than the reference time “t”, in step  407 , the control circuit  103  determines that the load of the motor  105  is of a magnitude which is too small to perform the rotational driving of the motor  105  with the main drive pulse P 12  (the driving with the main drive pulse P 12  causes a large power loss). Accordingly, the processing returns to step S 401  and the control circuit  103  performs the rotational driving of the motor  105  with the main drive pulse P 11 . In this manner, the pulse-down control is performed.  
         [0097]     As has been explained above, the motor control circuit according to this embodiment selects any one of the main drive pulses out of the plurality of main drive pulses based on the relationship of a magnitude between the time until the rotation detection signal which is indicative of the rotation of the motor is detected and the predetermined reference time, and rotationally drives the motor based on the selected main drive pulse. Accordingly, it is possible to rotationally drive the motor with the main drive pulse having the energy corresponding to the load of the motor with the simple constitution without using the counter circuit whereby the reduction of power consumption can be realized. Further, by forming the motor control circuit into an integrated circuit, it is possible to miniaturize the motor control circuit.  
         [0098]     Further, according to the analogue electronic clock of the above-mentioned each embodiment, it is possible to rotationally drive the motor with the main drive pulse having the energy corresponding to the load with the simple constitution and hence, the reduction of power consumption and the miniaturization of the electronic clock can be realized.  
         [0099]     Next, an analogue electronic clock according to another embodiment of the present invention is explained. Here, a block diagram of this embodiment and a constitutional view of a stepping motor used in the analogue electronic clock are equal to  FIG. 1  and  FIG. 2 . Further, in the explanation of another embodiment made hereinafter, parts identical with the parts shown in  FIG. 1  to  FIG. 5  are given same symbols and their explanation is omitted.  
         [0100]      FIG. 6  is a timing chart showing a plurality of (two kinds in this embodiment) main drive pulses (the first main drive pulse P 11  having a first pulse width, the second main drive pulse P 12  having a second pulse width which has larger energy than the first main drive pulse) and a rotation detection signal which expresses whether the motor  105  is rotated or not used in this embodiment.  
         [0101]     In  FIG. 6 , the main drive pulses P 11 , P 12  and the correction drive pulse P 2  described later are, in the same manner as the embodiment shown in  FIG. 3 , configured to have respective pulse widths thereof set in order of P 11 &lt;P 12 &lt;P 2 .  
         [0102]     Out of the rotation detection signals shown in  FIG. 6 , the rotation detection signals S 1 , S 2  of levels which exceed the predetermined reference signal voltage Vcomp are rotation detection signals which are indicative of the rotation of the motor  105 , while the rotation detection signals of levels which are equal to or below the reference signal voltage Vcomp are rotation detection signals which are indicative of the non-rotation of the motor  105 .  
         [0103]     Although described later in detail, in this embodiment, respectively corresponding to the main drive pulses P 11 , P 12 , reference times “t 1 ”, “t 2 ” which become the determination references at the time of changeover between the main drive pulses P 11 , P 12  (pulse changeover determination times) are provided.  
         [0104]     This embodiment is configured such that either one of the plurality of main drive pulses P 11 , P 12  is selected based on the magnitude relationship between time from a predetermined reference time (a point of time that the supply of the main drive pulses P 11 , P 12  to the motor  105  is finished in  FIG. 6 ) to a point of time at which the rotation detection signal which is indicative of the rotation of the motor  105  is detected by a rotation detection circuit  110  and predetermined reference times “t 1 ”, “t 2 ” and rotationally drives the motor  105  with the selected main drive pulse. That is, in the same manner as the above-mentioned embodiment, since a rotational speed of the motor  105  is changed corresponding to the energy of the drive pulse, by comparing the time until the rotation detection signal is detected and the predetermined reference times, it is determined whether the motor is rotationally driven with the drive pulse having the proper energy or not and the proper drive pulse is selected based on a result of the determination.  
         [0105]     In rotationally driving the motor  105  with the main drive pulse P 11 , for example, when it is determined by the detection time determination circuit  111  that the rotation detection signal S 2  which is indicative of the rotation of the motor  105  is generated at the point of time earlier than the first reference time “t 1 ” (within T 11 ), that is, when the rotation detection signal S 2  which is indicative of the rotation of the motor  105  is detected by the rotation detection circuit  110  before the predetermined reference time “t 1 ” elapses, the control circuit  103  determines that the rotational driving is performed with proper energy for the load of the motor  105  and continues the rotational driving of the motor  105  with the main drive pulse P 11 .  
         [0106]     In rotationally driving the motor  105  with the main drive pulse P 11 , when it is determined by the detection time determination circuit  111  that the rotation detection signal S 2  which is indicative of the rotation of the motor  105  is generated at the point of time later than the first reference time “t 1 ” (within T 21 ), that is, when the rotation detection signal S 2  which is indicative of the rotation of the motor  105  is detected by the rotation detection circuit  110  after the predetermined reference time “t 1 ” elapses, the control circuit  103  determines that the drive energy of the motor  105  is small and changes over the main drive pulse from the main drive pulse P 11  to the main drive pulse P 12  having larger energy than the main drive pulse P 11  and continues the rotational driving of the motor  105  with the main drive pulse P 12 .  
         [0107]     On the other hand, in rotationally driving the motor  105  with the main drive pulse P 12 , when it is determined by the detection time determination circuit  111  that the rotation detection signal S 1  which is indicative of the rotation of the motor  105  is generated at the point of time earlier than the predetermined second reference time “t 2 ” (within T 12 ), that is, when the rotation detection signal S 1  which is indicative of the rotation of the motor  105  is detected by the rotation detection circuit  110  before the predetermined second reference time “t 2 ” elapses, the control circuit  103  determines that the motor  105  is rotationally driven with the excessive energy for the load of the motor  105  and the changes over the rotational driving of the motor  105  to the rotational driving with the main drive pulse P 11  having the smaller energy than the main drive pulse P 12 .  
         [0108]     On the other hand, in rotationally driving the motor  105  with the main drive pulse P 12 , when it is determined by the detection time determination circuit  111  that the rotation detection signal S 1  which is indicative of the rotation of the motor  105  is generated at the point of time later than the predetermined second reference time “t 2 ” (within T 22 ), that is, when the rotation detection signal S 2  which is indicative of the rotation of the motor  105  is detected by the rotation detection circuit  110  after the predetermined second reference time “t 2 ” elapses, the control circuit  103  determines that the drive energy of the motor  105  is proper and the rotational driving of the motor  105  with the main drive pulse P 12  is continued.  
         [0109]     In this manner, this embodiment is configured such that either one of the plurality of main drive pulses P 11 , P 12  is selected corresponding to the magnitude of the load and the motor  105  is driven with the selected main drive pulse, wherein when the load is small, the motor  105  is rotationally driven with the main drive pulse P 11  and when the load is large so that the motor  105  is not rotationally driven with the main drive pulse P 11 , the motor  105  is rotationally driven with the main drive pulse P 12 . Accordingly, by eliminating the driving of the motor  105  with the correction drive pulse P 2  as much as possible, it is possible to realize power saving.  
         [0110]      FIG. 7  is a flowchart showing the manner of operation of the analogue electronic clock according to another embodiment of the present invention and is mainly a flowchart showing processing of the control circuit  103 .  
         [0111]      FIG. 8  is a timing chart showing the manner of operation of the analogue electronic clock according to this embodiment.  
         [0112]     Hereinafter, in conjunction with  FIG. 1 ,  FIG. 2  and  FIG. 6  to  FIG. 8 , the manner of operation of the analogue electronic clock according to another embodiment of the present invention and the motor control circuit suitably applicable to the analogue electronic clock is explained by mainly focusing on portions which makes another embodiment different from the above-mentioned embodiment.  
         [0113]     First of all, the usual drive operation (see  FIG. 8A ) in which the motor load is small and the motor  105  is rotationally driven with the main drive pulse P 11  is explained.  
         [0114]     In this case, first of all, the control circuit  103  performs the timer counting by counting time signals from the frequency dividing circuit  102  and, at a predetermined timing, generates a control signal for rotationally driving the motor  105  with the first main drive pulse P 11  having the short pulse width (step S 701  in  FIG. 7 ).  
         [0115]     The drive pulse selection circuit  104 , in response to the control signal from the control circuit  103 , rotationally drives the motor  105  with the main drive pulse P 11 . The motor  105  is rotationally driven with the main drive pulse P 11  and rotationally drives the time hands  107  to  109 . Accordingly, the display part  106  sequentially displays the present time using the time hands  107  to  109 .  
         [0116]     The rotation detection circuit  110  detects the rotation detection signal which is indicative of a rotation state from the motor  105  and outputs the rotation state to the detection time determination circuit  111 . The detection time determination circuit  111  compares the rotation detection signal from the rotation detection circuit  110  and the predetermined reference signal voltage Vcomp, determines whether the rotation detection signal voltage exceeds the predetermined reference signal voltage Vcomp or not, that is, whether the motor  105  is rotated or not, and notifies whether the motor  105  is rotated or not to the control circuit  103 . Further, when the detection time determination circuit  111  detects the rotation detection signal which exceeds the above-mentioned reference signal voltage Vcomp, the detection time determination circuit  111  compares the time from the completion of supply of the main drive pulse P 11  to the motor  105  to the point of time that the rotation detection signal is generated with the predetermined reference time (pulse changeover determination time) “t 1 ”, and notifies whether the time to the point of time that the rotation detection signal is generated is larger (longer) than the reference time “t 1 ” or not to the control circuit  103 .  
         [0117]     The control circuit  103 , based on the information from the detection time determination circuit  111 , determines whether the voltage of the rotation detection signal exceeds the reference signal voltage Vcomp or not, that is, whether the motor  105  is rotated or not (step S 702 ).  
         [0118]     Further, when the control circuit  103  determines that the rotation detection signal voltage exceeds the reference signal voltage Vcomp, that is, the motor  105  is rotated in step S 702 , the control circuit  103  determines whether the time from the completion of supply of the main drive pulse P 11  to the motor  105  to the point of time that the rotation detection signal is generated is longer than the pulse changeover determination time “t 1 ” which is the first reference time or not (step S 703 ).  
         [0119]     When the control circuit  103  determines that the time to the point of time that the rotation detection signal is generated is longer than the pulse changeover determination time “t 1 ” in step S 703 , the control circuit  103  determines that the drive energy is more or less insufficient with the main drive pulse P 11  and performs a control to rotationally drive the motor  5  by changing over the main drive pulse P 11  to the main drive pulse P 12  having the larger energy than the main drive pulse P 11  (step S 705 ).  
         [0120]     Further, when the control circuit  103  determines that the rotation detection signal voltage does not exceed the reference signal voltage Vcomp, that is, the motor  105  is not rotated in step S 702 , the control circuit  103  rotationally drives the motor  105  with the correction drive pulse P 2  and, thereafter, performs a control to rotationally drive the motor  105  by changing over the correction drive pulse. P 2  to the main drive pulse P 12  (step S 704 ).  
         [0121]     When the control circuit  103  determines that the time to the point of time that the rotation detection signal is generated is not longer than the pulse changeover determination time “t 1 ” in step S 703 , the control circuit  103  determines that the rotational driving of the motor  105  with the main drive pulse P 11  is proper and returns to step S 701 .  
         [0122]     The control circuit  103 , after rotationally driving the motor  105  with the main drive pulse P 12  in step S 705 , determines whether the rotation detection signal voltage exceeds the reference signal voltage Vcomp or not, that is, the motor  105  is rotated or not based on the information from the detection time determination circuit  111  (step S 706 ).  
         [0123]     When the control circuit  103  determines that the rotation detection signal voltage exceeds the reference signal voltage Vcomp, that is, the motor  105  is rotated in step S 706 , the control circuit  103  determines whether the time from the completion of supply of the main drive pulse P 12  to the motor  105  to the point of time that the rotation detection signal is generated is longer than the pulse changeover determination time “t 2 ” which is the second reference time shorter than the above-mentioned pulse changeover determination time “t 1 ” (step S 707 )  
         [0124]     When the control circuit  103  determines that the time to the point of time that the rotation detection signal is generated is larger (longer) than the pulse changeover determination time “t 2 ” in step S 707 , the control circuit  103  determines that the drive energy is more or less insufficient with the main drive pulse P 11  and the driving of the motor  105  with the main drive pulse P 12  is proper and returns to step S 705  and performs a control to continue the rotational driving of the motor  105  with the main drive pulse P 12 .  
         [0125]     When the control circuit  103  determines that the rotation detection signal voltage does not exceed the reference signal voltage Vcomp, that is, the motor  105  is not rotated in step S 706 , the control circuit  103  performs a control such that the control circuit  103  performs the rotational driving of the motor  105  with the correction drive pulse P 2  and, thereafter, returns to step S 701  and performs the rotational driving of the motor  105  by changing over the correction drive pulse P 2  to the main drive pulse P 11 . (step S 708 ).  
         [0126]     Further, when the control circuit  103  determines that the time to the point of time that the rotation detection signal is generated is not longer than the pulse changeover determination time “t 2 ” in step. S 707 , the control circuit  103  determines that the drive energy is excessively large with the main drive pulse P 12  and the driving of the motor  105  with the main drive pulse P 11  is proper and returns to step S 701  and performs a control to continue the rotational driving of the motor  105  by changing over the main drive pulse P 12  to the main drive pulse P 11 .  
         [0127]     As has been explained above, according to another embodiment, it is possible to obtain not only the advantageous effects substantially equal to the advantageous effect of the above-mentioned embodiment but also an advantageous effect that the changeover between the main drive pulses P 11 , P 12  can be performed without performing the driving of the motor  105  with the correction drive pulse P 2  as an intermediate operation so that the further energy saving is achieved. Further, it is possible to prevent the occurrence of the failure of pulse-down from the main drive pulse P 12  to the main drive pulse P 11  due to the irregularities of detection times which are generated attributed to the irregularities of parts per se such as rotor, stator and the like or assembling irregularities.  
         [0128]     Here, according to another embodiment, although the plurality of pulse changeover determination times “t 1 ”, “t 2 ” are set different from each other, these pulse changeover determination times “t 1 ”, “t 2 ” may be set equal to each other.  
         [0129]     Further, in the above-mentioned embodiments, as the plurality of main drive pulses which differ in drive energy, the main drive pulses which differ in the pulse width from each other are used. However, the plurality of main drive pulses may differ from each other in the voltage level of the drive pulse or the plurality of main drive pulses may differ from each other in both of the pulse width and the voltage level of the drive pulse.  
         [0130]     According to the motor control circuit of the present invention, it is possible to rotationally drive the motor with the main drive pulse having the energy corresponding to a load with the simple constitution without using the counter circuit. Further, the reduction of power consumption can be realized.  
         [0131]     Further, by eliminating the driving with the correction drive pulse at the time of: performing the changeover between the main drive pulses, it is possible to realize the further reduction of power consumption.  
         [0132]     Further, according to the analogue electronic clock of the present invention, it is possible to rotationally drive the motor with the main drive pulse having the energy corresponding to a load with the simple constitution without using the counter circuit. Further, the reduction of power consumption can be realized.  
         [0133]     The analogue electronic clock of the present invention is applicable to various analogue electronic clocks including an analogue electronic wrist watch, an analogue electronic table clock, an analogue electronic clock with a calendar, and is particularly applicable to an analogue electronic clock which uses a battery as a power source.  
         [0134]     Further, the motor control circuit of the present invention is applicable to motor control circuits of various motors besides the motor control circuit for a stepping motor for driving time hands and the calendar of the above-mentioned analogue electronic clock.