JP2996062B2 - Stopwatch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stopwatch having functions such as start / stop / lap of integrated measurement time.

[0002]

2. Description of the Related Art A conventional stopwatch has a start / stop function.
In addition to basic functions such as stop / reset, additional functions such as lapping are provided.

[0003]

However, when various measurement functions are added, the number of switches for performing the measurement increases. The user memorizes which switch can perform what measurement (function), and when performing the switch operation, it is necessary to select the switch at the same time as the timing. In many cases, an erroneous switch is often operated by being distracted by the operation timing of the switch, and there has been a problem that it often fails to measure a necessary time. Therefore, an object of the present invention is to provide an easy-to-use stopwatch by reducing the number of switches requiring timing to one.

[0004]

According to the present invention, there is provided a stopwatch comprising: a timer for measuring time; a memory for storing a value measured by the timer in synchronization with a first external switch; Display means for displaying a value;
When the second external switch is operated, the latest measurement value stored in the storage unit is displayed by the display unit. It is characterized by displaying.

[0005]

The present invention will be described below in detail with reference to examples. FIG. 1 is a block diagram of a stopwatch according to the present invention. The control unit 1 has a built-in stopwatch counter in units of 1/10 second, and this stopwatch counter can read data by software. The stopwatch counter can generate a 1 Hz interrupt. The control unit 1 stores the 1 Hz interrupt in a memory register and counts the measurement data synchronized with the second, minute, and hour data. In the embodiment, the time can be measured up to 9 hours 59 minutes 59 seconds 9. The first switch 6 of the external operation member is a START / LAP switch, and timekeeping data is stored in the memory 2 according to the LAP measurement. The second switch 7 of the external operation member is STOP
/ RESET switch. The data being measured and the stored data in the memory 2 are sent to the LCD drive circuit 3 via the control unit 1 and displayed on the LCD display 5. A clock signal is sent from the crystal oscillation circuit 4 to the control unit 1 and the LCD drive circuit 3. The measurement processing unit 8 including the control unit 1, the memory 2, the LCD drive circuit 3, and the oscillation circuit 4 is configured by a one-chip microcomputer. In the embodiment, the first switch is set to the stopwatch counter S.
The second switch is a stop switch when the stopwatch counter is in the RUN state, and the second switch is a reset switch when the stopwatch is in the STOP state. This processing operation is the same as the conventional one.

The display 5 is a two-stage display, in which the lap time is displayed in the upper part and the accumulated time is displayed in the lower part.

FIG. 2 is a flowchart of the switch processing of the present invention. When the first and second switches are operated,
An interrupt occurs and the process proceeds to the switch processing (S20). First, "1st switch input?" (S21) is executed to determine whether the interrupt is caused by the first switch. First
If it is a switch, the process proceeds to "counting?" (S22) to determine whether the stopwatch counter is in the RUN state. In the STOP state, set the stopwatch counter to R
The process proceeds to "start timing" (S23) for setting the state to UN. Then, the process proceeds to "Display the contents of the counter in the lower row" for displaying the data being counted (S41), and the switch processing ends "E".
ND "(S42). If it is in the RUN state in S22, the timing data is stored in the memory 2 and" the content of the counter is stored in the memory "(S24). Judge "First LAP
? "Execute (S25). At first, display the timekeeping data stored in S24." Display the contents of the memory in the upper row. "
Proceed to (S26). Then, the process proceeds to “display“ LAP ”” (S29), which indicates that it is the lap time, and similarly proceeds to S42. If it is not the first lap process in S25, the lap time is calculated from the measurement data stored in S24 and the previously stored measurement data. "
Proceed to "Calculation of LAP time" (S27). Display the result of this calculation. Proceed to "Display the calculation result in the upper stage" (S28). The following is the same as above. Is an input to the second switch.First, it is determined whether or not the stopwatch counter is in the STOP state. "Execute (S30). If the stopwatch counter is in the RUN state, set the stopwatch counter to the STOP state. Go to" Stop the counter "(S31). Then, execute S24 to determine whether the measurement data is stored in the memory. Do "no memory?""Then proceed to (S32). If there is no memory, execute the" clear counter memory "(S33), which clears the stopwatch counter, the measurement data from the second to the hour, and the memory 2; When the memory is stored in S32, it is determined whether there is only one piece of clock data stored. "
(S34) is executed. When the number of stored data is one, the stored data is displayed. "Display the latest data in the memory at the bottom" (S37) and the stopwatch counter is set to S
"Display" STOP "indicating TOP status"
(S38) is executed, and the process proceeds to S42. That is, the upper and lower displays have the same measurement data. If the number of pieces of measurement data stored in S34 is other than one, the lap time is calculated from the latest measurement data stored last in the memory 2 and the measurement data stored second from the last. Is calculated ”(S35).
Then, "display calculation result in upper row" (S36) for displaying the calculation result is executed. Further, the latest data stored last is displayed by executing "display latest data in memory at lower stage" (S37), and "stop" is displayed to indicate that the stopwatch counter is in the STOP state.
(S38) is executed, and the process proceeds to S42. When the stopwatch counter is in the STOP state in S30, the display of the lap time is deleted.
9), “LAP” and “STOP” are turned off.
LAP, STOP "is deleted (S40), and the following is the same as above, and this series of processing is RESET processing.

If the second switch is operated while the stopwatch counter is in the RUN state, the stopwatch counter enters the STOP state and, at the same time, measurement data obtained by operating the first switch immediately before the second switch is operated is displayed.

[0009] The lower display is updated every 16 Hz.

FIG. 3 is a display diagram showing a display example of the display unit 5. As an example, there is a 400 m competition with two rounds of a 200 m track. The competitor carries a stopwatch and 200
Self-measurement including lap time every m. FIG. 3 (a)
Is in the RESET state. In this state, when the first switch (START / LAP) is operated at the same time as the start of the competition, the stopwatch counter is in the RUN state (S2
3), the contents of the stopwatch counter are updated at 16 Hz in the lower part as shown in FIG. When the first switch is operated again for measuring the lap time when the vehicle has made one round of the track and passed 200 m, the measured time 0 hour 00 minute 25 second 3 is stored in the memory 2 and becomes as shown in FIG. S24, S25, S26, S29). The lap time is held until the next lap time is measured. When the first switch is operated again at the goal point, the measurement time is 0
The time 00: 52: 5 is stored in the memory 2, and FIG.
(S24, S25, S27, S28, S2
9). Stopwatch counter remains R after passing goal
Since the state is the UN state, the time is accumulated as shown in FIG. Here, if the stopwatch counter is set to the STOP state by operating the second switch without worrying about the timing, the measurement time at the time of stopping is invalidated, and FIG.
(F) (S31, S32, S34, S3
5, S36, S37, S38). That is, the stop time is data measured at the goal point, and the stop switch is a switch for stopping the measurement (similar to FIG. 3D). Here, when the second switch is operated, the state becomes as shown in FIG. 3 (g) (S39, S40, S33).

The memory 2 stores 0 hours 00 minutes 25 seconds 3 and the latest 0 hours 00 minutes 52 seconds 5 and the lap time is calculated from these two data.

Although the lap measurement has been described in the embodiment,
Split measurement is also possible.

[0013]

As described above, in the conventional method, the point in time when the second switch, which is a stop switch, is pressed (timing) is set as the stop time, so that the first and second switches are switches that require timing. It has become. According to the present invention, only one switch needs to be the first switch, and the user only needs to consider the timing of the time measurement, thus providing a convenient stopwatch.

[Brief description of the drawings]

FIG. 1 is a block diagram of a stopwatch of the present invention.

FIG. 2 is a flowchart of a switch process of the present invention.

FIG. 3 is a display diagram showing a display example of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Control part 2 ... Memory 3 ... LCD drive circuit 4 ... Oscillation circuit 5 ... Display 6 ... First switch 7 ... Second switch 8 ... Measurement processing Department

Claims (1)

(57) [Claims] A timer for measuring time; a memory for storing a value measured by the timer in synchronization with a first external switch; a display for displaying a value measured by the memory;
A stopwatch having stop means for stopping the measurement of the timing means in synchronization with a second external switch;
When the second external switch is operated, the latest measured value stored in the storage means is displayed on a display means.