JPH0627258A - Time measuring instrument - Google Patents

Abstract

PURPOSE:To make continuous time measurement so as to eliminate the occurrence of unexpected omission of time measurement through carelessness by successively actuating a plurality of time measuring circuits and outputting operation ending signals to next circuits so as to start measurement. CONSTITUTION:Measuring units 11, 12,..., in control the measuring and other operations of time measuring sections 31, 32,..., 3n respectively connected to the units 11, 12,..., 1n by discriminating whether or not the sections 31, 32,..., 3n must make measurement based on given signals. Delay circuits 21, 22,..., 2n delay start and stop signals from the outside. The sections 31, 32,..., 3n measure the time intervals between the start signals and stop signals and store the time intervals in memories 41, 42,..., 4n. A switch 50 outputs the output of the unit 1n or a high-level value to the unit 11 based on an initializing signal and inverts a trigger waiting signal outputted from the unit 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a time measuring device which enables continuous measurement in time width measurement.

[0002]

2. Description of the Related Art In time measurement width measurement, time extension is performed when measuring fractional hours, and calculation for the extension is performed. Therefore, time for calculation is required in addition to the actual time required for measurement. , Continuous measurement was impossible. That is, when the start signal is input once, the start signal is not accepted until the calculation of the measurement result based on the start signal is completed, so that the time width is not continuously measured.

[0003]

Therefore, there is a problem in that the measurement may be missed in a signal which is continuously changing. An object of the present invention is to eliminate such missed signal measurement and enable continuous time measurement. Further, in the configuration according to the present invention,
It is devised so that the user can easily change the hardware configuration for continuous measurement.

[0004]

According to the present invention, there are provided a plurality of measurement control units for inputting a start signal, an initialization signal and a sampling clock from the outside and outputting a measurement signal, and a signal from each of the measurement control units. A plurality of time measuring units for performing time width measurement based on the above, a plurality of memories for storing data measured by each time width measuring instrument, and a switch for selecting a measurement preparation signal of the first time width measuring instrument, An initialization circuit for outputting a signal for controlling the switch is provided, and in the plurality of time width measuring instruments, the end signal from the first time width measuring instrument is a measurement preparation signal of the second time width measuring instrument. The end signal from the time width measuring device at the final stage is connected to the switch and is input to the switch.The switch selects an external signal or an end signal from the time width measuring device at the final stage. Output as the first measurement providing signal time width measuring instrument, a time measuring apparatus, characterized in that performed continuously time width measurement.

[0005]

By operating a plurality of time width measuring circuits in sequence and outputting an operation end signal to the next circuit, continuous time measurement becomes possible.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the basic configuration of the present invention.
Indicated by 11, 12, ..., 1n are measurement control units, which are connected to respective time measuring units 31, 32, based on a given signal.
It is determined whether or not the measurement is performed at 3n, and the measurement and other operations are controlled. Delay units 21, 22, ..., 2n delay the start and stop signals of external signal measurement.
.. 3n is a time measuring unit for measuring the time width between the start signal and the stop signal. 41, 42, ...
4n is a memory, which stores the measurement results and the like of each of the time measuring units 31, 32, ... 3n. A switch 50 outputs the output of the measurement control unit 1n or the value of H level to the measurement control unit 11 based on the initialization signal. The trigger wait signal output from the measurement control unit 11 is reversed. 60
Is an inverter, 70 is a flip-flop, 80 is an AND, and 90 is a CPU. The measurement control unit 11 is shown in FIG.
An example is shown in FIG. Flip-flop 110,
It consists of 120 and or 130.

The operation of such a configuration will be described with reference to the time chart of FIG. (A) is a reset signal from the CPU 90, (b) is a CPU signal which is input from the CPU 90 or the like for initialization. (C) is a start signal, which is a pulse signal indicating the start of time width measurement. (D) is a stop signal, which is a pulse signal indicating the end of the time width measurement.
(E) is a sampling clock, which is given from the CPU 90 or the like. D11 is an initialization signal input to the data input terminal (D11) of the flip-flop 110, which is selected by the switch 50 from the output of the flip-flop 70 or the output from the measurement control unit 1n. Q11 is a synchronization initialization signal, which is the Q11 of the flip-flop 110.
It is an output from the terminal and is obtained by synchronizing the initialization signal D11 with the sampling clock (e). Q12 is an input signal waiting signal, which is output from the flip-flop 120 and input to the time measuring unit 31. The inverted output terminal of Q12 outputs the input signal waiting signal of Q12 inverted. The second initialization signal (D21), the second synchronization initialization signal (Q21), the second input signal waiting signal (Q22), etc. are also signals in the measurement control unit 12 similar to the above.

The operation in such a configuration will be described.
First, the reset signal from the CPU 90 becomes H level, and the entire device according to the present invention starts operating. At this time, in the first sampling, the switch 50 selects the output of the flip-flop 70 which has become H level due to the rise of the CPU signal (b) from the CPU 90. This is the rising edge of the initialization signal (D11). Therefore, terminal D
When the rising edge of the sampling clock (e) is given when 11 is at the H level, the output of (Q11) of the flip-flop 110 rises. This synchronization initialization signal (Q11) is applied to the terminal D1 of the flip-flop 120.
Since it is input to 1, the output of the terminal Q12 of the flip-flop 120 rises at the rising edge of the start signal (c).

Since the inverted output of the terminal Q12 and the OR of the reset signal are input to the reset terminal of the flip-flop 110, if the reset signal remains at the H level, the terminal Q12 rises, that is, the inverted output of the terminal Q12 falls. When there is a terminal Q of the lip flop 110
11 falls. Therefore, the output of the terminal Q12 falls at the next rise of the start signal (c).

The output of the terminal Q12 is input to the time measuring section 31 as an input waiting signal (so-called arming signal). Therefore, while the input waiting signal (so-called arming signal) Q12 is at the H level, the time measuring unit 31 measures the time width T1 between the input start signal and stop signal. Since the start signal (c) and the stop signal (d) are input to the time measuring unit 31 with a delay of the same time, an input waiting signal (so-called arming signal)
The time width T1 exists while Q12 is at the H level.

An input waiting signal (so-called arming signal) is input to the measuring unit 12 as a second initialization signal (D11) from the output of the terminal Q12. The subsequent operation is as described above. Continuous measurement is possible by repeating the same operation. The arming signal of the measuring unit 1n becomes the initialization signal of the next measuring unit 11, and the continuous operation is repeated again.

[0012]

According to the present invention, a time measuring device capable of measuring a continuous time width can be realized. Further advantages of the present invention will be described. A first advantage is that the present invention can provide a function (related to continuous time measurement) corresponding to the specifications of the user side by adding a unit such as a measurement unit and a time measurement unit accompanying it. That is, a user whose measurement target frequency is low may use a small number of measurement units, and a user whose measurement target frequency is high may use a large number of measurement units to improve the measurement accuracy. Second
The advantage of is that the input waiting signal (arming signal) is generated based on the initialization signal synchronized with the sampling clock. Therefore, it is effective when the start signal of the input signal to be measured is very slow or very fast with respect to the sampling clock cycle.

[Brief description of drawings]

FIG. 1 is a basic configuration diagram of the present invention.

FIG. 2 is a configuration diagram of a main part of the present invention.

FIG. 3 is a time chart showing the operation of the present invention.

[Explanation of symbols]

 11, 12 ... 1n Measurement control unit 21, 22, ... 2n Delay circuit 31, 32, ... 3n Time measuring unit 41, 42, ... 4n Memory 50 Switch 60 Inverter 70 Flip-flop 80 And 90 CPU

Claims (1)

[Claims] 1. A plurality of measurement control units that input a start signal, an initialization signal, and a sampling clock from the outside and output a measurement signal, and perform time width measurement based on the signals from each of the measurement control units. A plurality of time measuring units, a plurality of memories for storing data measured by each time width measuring instrument, a switch for selecting a measurement preparation signal of the first time width measuring instrument, and a signal for controlling the switch And an initialization circuit for outputting the end signal from the first time width measuring device in the plurality of time width measuring devices so that the end signal from the first time width measuring device becomes the measurement preparation signal of the second time width measuring device. The end signal from the time width measuring device is input to the switch, and the switch selects an external signal or the end signal from the final time width measuring device to measure the first time width measuring device. A time measuring device characterized by outputting as a prepared signal and continuously measuring the time width.