JPS6248198B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic device with an alarm function.

Recently, for example, small-sized electronic calculators have been developed in which a clock function is incorporated and an alarm is activated at a preset time. On the other hand, since small batteries are generally used as a power source in this type of small electronic calculator, it is highly desirable to devise circuits and systems that can reduce power consumption as much as possible.

The present invention has been made in view of the above points, and
It is an object of the present invention to provide an electronic device having an alarm function that can sufficiently exhibit an alarm function and further reduce power consumption.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings, taking a small electronic computer with an alarm function as an example. In FIG. 1, numeral 1 is a calculation function section operated by the first power supply section 2a, and numeral 3 is a timekeeping function section operated by the second power supply section 2b. Note that the calculation function section 1 includes an alarm sound generation function. In the first power supply section 2a, a DC power source 4 such as a battery is supplied to a DC-DC converter 7 through a parallel circuit of a power switch 5 and a switching circuit 6.
The DC converter 7 converts the voltage into various voltages. The voltage output from this DC-DC converter 7 is supplied to the calculation function section 1 as an operating voltage. This calculation function unit 1 includes a key input unit 11, a calculation unit 12 that performs calculations according to input data from the key input unit 11, a storage unit 13 that stores calculation data and calculation results of this calculation unit 12, and The key input unit 11, the calculation unit 12, the control unit 14 that controls the storage unit 13, etc. are the main components, and the input data, calculation results, etc. stored in the storage unit 13 are sent to the display unit 16 via the decoder 15. transmitted and displayed digitally. Further, the calculation function section 1 is provided with a timing signal generation circuit 17, and this circuit 1
A timing signal outputted from the decoder 15 is sent to a display drive circuit 18, and the display drive circuit 18 drives the display section 16 in accordance with the output of the decoder 15. Further, the timing signal generation circuit 17 outputs a signal in the audible frequency range for alarm, and the signal is sent to the speaker drive circuit 2 via the AND circuit 19.
Sent to 0. And this speaker drive circuit 2
0 drives the speaker 21.

Next, the configuration of the timekeeping function section 3 will be described. Reference numeral 31 is an oscillator that generates a reference signal.The output of this oscillator 31 is sent to the timing signal generation circuit 32 in the timekeeping function section 3, and the calculation function section 1
The signal is sent to the timing signal generation circuit 17 inside. The output of the timing signal generation circuit 32 is sent to the input circuit 35 along with the outputs of the time register 33 and alarm data register 34. This input circuit 35 selects an input signal according to a control signal from a control circuit 36 and sends it to an arithmetic circuit 37 . This calculation circuit 37 performs calculations such as addition and subtraction in accordance with calculation instructions from the control circuit 36. This calculation circuit 3
The output of 7 is controlled by a control circuit 36. The signal is sent to the time register 33 via the gate circuit 38. The contents of this time register 33 are cyclically held via a gate circuit 38 and are stored in the calculation function section 1.
The data is transferred to the storage unit 13 in response to a command from the control unit 14 within the storage unit 13. The alarm data register 34 also stores alarm time setting data input from the key input section 11 of the calculation function section 1 in the storage section 13.
and is given via the gate circuit 39. Also,
The output of the arithmetic circuit 37 is output from the flip-flop 4.
It is applied to the reset terminal R of 0 and to the set terminal S of the flip-flop 41. A reset signal is applied to the reset terminal R of this flip-flop 41 via a reset switch 42. The set terminal S of the flip-flop 40 is connected to signal lines 36a and 36 from the control circuit 36.
An alarm judgment signal J _s having a time width of one word and a timing signal T which are output to the terminal b are applied via an AND circuit 43 . The above-mentioned alarm judgment signal _Js is sent to the time register 33 as shown in FIG.
The timing signal T has a time width of one word in synchronization with the clock pulse φ _e output at the final timing of each read cycle, and the timing signal T is output near the leading edge of this alarm judgment signal J _s . Further, the control unit 36 outputs a judgment end pulse J _E at the trailing edge of the judgment signal J _s as shown in FIG. 2 via the signal line 36 c. This judgment end pulse J _E is passed through an AND circuit 44 together with the output of the flip-flop 40 to the flip-flop 4
It is applied to the set terminal S of 5. The side output of the flip-flop 41 is applied to the reset terminal R of the flip-flop 45. The output of the flip-flop 45 is sent to the switching circuit 6 of the first power supply section 2a, and is also applied to the control section 14 and the AND circuit 19 in the calculation function section 1.

Next, the operation of the present invention configured as described above will be explained. The timekeeping function section 3 performs a timekeeping operation by being constantly supplied with an operating voltage from the second power supply section 2b. When setting or correcting the clock time in the clock function section 3, the power switch 5 is turned on to supply operating voltage to the calculation function section 1, and then time data is input using the key input section 11. The time data input by this key operation is stored in the storage unit 13.
is sent to and temporarily stored. After inputting the time data, a control signal is sent from the control section 14 to the gate circuit 38 by operating a time setting key (not shown) of the key input section 11, and the time is temporarily stored in the storage section 13. Data is gate circuit 38
The timer is set in the timer register 33 via the timer, and the timer operation is started from this set time. That is,
The signal output from the timing signal generation circuit 32 is sent to the arithmetic circuit 37 via the input circuit 35 together with the output of the time register 33.
``1'' is added to the least significant bit of ``1'' at a predetermined period. The result of this addition is sent to the time register 33 via the gate circuit 38, and is cyclically held via the gate circuit 38 until the next addition. Further, the carry at each unit time associated with the above addition operation is performed in the arithmetic circuit 37 in accordance with a control command from the control circuit 36.

Further, in setting the alarm data, first, alarm time setting data is inputted using the key input section 11, similar to the setting of the above-mentioned time data. Alarm data input by this key operation is sent to the storage section 13 and temporarily stored, and then the key input section 11
The alarm data is transferred to the alarm data register 34 via the gate circuit 39 by operating an alarm data setting key (not shown) in . The alarm data set in the alarm data register 34 is circulated and held via the gate circuit 39 and sent to the arithmetic circuit 37 via the input circuit 35 at fixed intervals, for example, every 0.5 seconds. It is compared to see if it matches the data. Also,
Prior to this data comparison, the control circuit 36 outputs the judgment signal J _s and the timing signal T shown in FIGS. As a result, the flip-flop 40 is set, and within one word thereafter, the alarm data and time data are compared as described above. To compare this data, a subtraction command is sent from the control circuit 36 to the arithmetic circuit 37, and the arithmetic circuit 37 subtracts the time data from the alarm data. If the current time has not reached the alarm time, the subtraction result of the arithmetic circuit 37 will not be "0", and the flip-flop 40 will be reset by this subtraction result. After that, from the control circuit 36 to the signal line 3
The judgment end pulse J _E is output at 6c, but at this point the output of the flip-flop 40 is "0", so the output of the AND circuit 44 is "0".
Therefore, flip-flop 45 is not set. When the current time reaches the alarm time, the subtraction result of the arithmetic circuit 37 becomes "0", and the flip-flop 40 is not reset as shown in FIG. 2e, but is kept in the set state. Therefore, when the determination end signal shown in FIG. 2d is output from the control section 36 to the signal line 36c, the AND circuit 4
The output of 0 becomes “1” and the flip-flop 45
is set as shown in FIG. 2f, and its output becomes "1". The output of the flip-flop 45 is sent to the switching circuit 6 of the first power supply section 2a, and the circuit is switched so that the direct source 4 is connected to the DC-DC converter 7. Therefore, even if the power switch 5 is off at this time, various operating voltages are output from the DC-DC converter 7, and the calculation function section 1 becomes operable. Further, the output of the flip-flop 45 is sent to the AND circuit 19 to open its gate, so that an alarm signal is sent from the timing signal generation circuit 17 to the speaker drive circuit 20, and the speaker 21 is driven. That is, the alarm operation is performed by driving this speaker 21. Furthermore, the output of the flip-flop 45 is sent to the control section 14 within the calculation function section 1. When this control section 14 receives a "1" signal from the flip-flop 45, it reads out the contents of the clock register 33 into the storage section 13, and, if necessary, converts the signal by the arithmetic section 12 in accordance with the display form of the display section 16. For example, when the time register 33 performs a time measurement operation using a hexadecimal signal format, it is converted to a decimal signal format. Then, the time data stored in the storage section 13 is sent to the display section 16 via the decoder 15, and the time is displayed. In this way, at the alarm time, the speaker 21 emits an alarm sound, and the time can be displayed on the display section 16 if necessary. When the alarm operation is to be stopped, the reset switch 42 is operated to reset the flip-flop 41. When this flip-flop 41 is reset, the output on that side becomes "1" and the flip-flop 45 is reset. As a result, the output of the flip-flop 45 becomes "0", the switching circuit 6 is switched to open the connection between the DC-DC converter 7 and the DC power supply 4, and the power supply to the calculation function section 1 is cut off. Therefore, the operation of the calculation function section 1 is stopped, and the alarm operation is stopped.

In this way, in the present invention, the timekeeping function section 3 performs constant clock operation, but the calculation function section 1 including the alarm generation section operates only when the power switch 5 is turned on or when an alarm occurs, and the alarm sound is emitted. During the generation function, the operation is always stopped, which can reduce power consumption.

In the above embodiment, the alarm operation is stopped by operating the reset key 42, but in other cases, for example, the control circuit 36 outputs a signal with a cycle of 1 minute, and this 1 minute signal is output from the reset key 42. If the alarm is applied to the reset terminal R of the flip-flop 41 through the OR circuit, if the alarm operation is performed for one minute, the above 1.
The alarm operation can be automatically stopped by the minute signal.

Further, in the embodiment described above, a case is shown in which one alarm data is set in the alarm data register, but a plurality of alarm data may be set in the alarm data register. Although an example is shown in which the storage unit 13 stores time data, alarm data, and calculation data, the storage unit 13 is not limited to this, for example,
Of course, information related to the alarm, such as data for controlling the alarm, can be stored.

Further, in the above embodiment, an example was shown in which the present invention was applied to a small electronic calculator with an alarm function, but it goes without saying that the present invention can also be applied to electronic devices with an alarm function, such as an electronic watch with an alarm function.

As described above, according to the present invention, the alarm function can be fully demonstrated, and power consumption can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a circuit configuration diagram showing an embodiment of the present invention;
FIG. 2 is a timing chart for explaining the operation of the same embodiment. 1... Calculation function section, 2a... First power supply section, 2
b...Second power supply unit, 3...Timekeeping function unit, 6...
Switching circuit, 33...Time register, 34...Alarm data register, 37...Arithmetic circuit.

Claims (1)

[Claims] 1. In an electronic device that has a first circuit system that is constantly supplied with power and is in an operating state, and a second circuit system that can be brought into an operating state as necessary, the first circuit system has: At least a reference signal generator that generates a reference signal, a clock circuit that obtains time information by counting the reference signal from the reference signal generator, an alarm storage circuit that stores alarm time setting data, and settings for this alarm storage circuit. The second circuit system includes a coincidence detection circuit that compares the set alarm time setting data and the time data measured by the clock circuit to detect a match, and the second circuit system includes a display unit and a display unit that displays at least the alarm time. It is equipped with a sound alarm function section for sounding a sound, a storage section for storing information related to the alarm, and a control section for controlling the sound sound function section and the storage section, from the coincidence detection circuit of the first circuit system. An electronic device having an alarm function, characterized in that the second circuit system is controlled to be in an operational state by a coincidence detection signal, and information in the storage section is displayed on the display section.