JPH03218130A - Optical signal input type device - Google Patents

Abstract

PURPOSE:To switch the operation of a microcomputer depending on the presence of an input signal and to extend the service life of the power supply by using an input monitor circuit monitoring an input signal for a prescribed time to a pre-stage of the reception processing microcomputer. CONSTITUTION:The optical signal input type device comprising of an optical signal reception circuit 1 and an information processing unit 2 is provided with an input monitor circuit 4. The input monitor circuit 4 includes a counter circuit and when an electric signal is repetitively outputted from the optical signal reception circuit 1 for a period not in excess of a period counting reference clocks for a prescribed number, it is detected to keep the information processing unit 2 in the operating state. When the period is exceeded and a succeeding electric signal is not outputted from the optical signal reception circuit 1, the operation of the information processing unit 2 is inhibited and the device is led to the standby state with less power consumption. Thus, power consumption is saved without losing a substantial object as the reception of an optical signal and the service life of the power supply of the device is extended.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an optical signal receiving circuit that receives an optical signal, converts it into an electrical signal, and outputs it, and an optical signal receiving circuit that receives the electrical signal from the optical signal receiving circuit and performs calculation. It relates to an optical signal input type device consisting of an information processing device that performs processing and outputs the result,
More specifically, the present invention relates to such an optical signal input type device that can reduce power consumption by guiding an information processing device to a standby state with low power consumption when the optical signal receiving circuit is not receiving an optical signal. It is something.

[Conventional technology]

Conventionally, this type of optical signal input type equipment has various uses such as process monitoring equipment and data reception display devices, but it is necessary to keep it in a constant operating state so that it can receive optical signals at any time. It was common to maintain

[Problem to be solved by the invention]

Since such conventional optical signal input type equipment always maintains an operating state, even if for some reason an optical signal does not arrive for a prolonged period, it maintains its operating state and reduces the power consumption. There was a problem of wasting energy.

An object of the present invention is to solve such problems, and to keep a device in an operating state only while optical signals repeatedly arrive within a certain period of time, and to put the device in a standby state for the rest of the period. and reduce power consumption during that time.
The object of the present invention is to provide an optical signal input type device equipped with such a means, which can extend the power life of the device.

[Means to solve the problem]

To achieve the above object, the present invention includes an optical signal receiving circuit that receives an optical signal, converts it into an electrical signal, and outputs it, and information that takes in the electrical signal from the optical signal receiving circuit, performs arithmetic processing, and outputs the result. An optical signal input device comprising a processing device and an input monitoring circuit is provided.

[Operation] The input monitoring circuit includes a counter circuit, and the optical signal receiving circuit repeatedly outputs an electrical signal at a period not exceeding a period during which the counter circuit counts a predetermined number of reference clocks. When this happens, the information processing device is maintained in an operating state by detecting this fact, but when the next electrical signal is not output from the optical signal receiving circuit even after the above-mentioned period has elapsed, this fact is detected and the information processing device is maintained in an operating state. The operation of the information processing device is prohibited and placed in a standby state with low power consumption.

In this way, when no optical signal is received, the device can be placed in a stand-high standby state to reduce power consumption, and when an optical signal is received, it can immediately go into operation. It is possible to reduce power consumption and extend the life of the device's power supply without sacrificing the original purpose of reception.

(Embodiment) Fig. 1 is a Bronnock diagram showing an embodiment of the present invention.In the figure, 1 is an optical signal receiving circuit, 2 is a microcomputer (information processing device), 3 is an output section, and 4 is an input section. The monitoring circuit 5 is a power source (for example, a battery).

The power supply 5 is connected to the optical signal receiving circuit 1 and the microcomputer 2.
, the output section 3, and the input monitoring circuit 4, respectively. The optical signal receiving circuit 1 receives an optical signal 6
When the signal arrives, it is received, converted into an electrical signal 7, and supplied to the microcomputer 2. The microcomputer 2 performs necessary processing on the received electrical signal (input signal) 7, and sends the processing result to the output section 3 for visual display or printing out, for example.

Now, consider a state in which no optical signal arrives and therefore the optical signal receiving circuit 1 does not output the electrical signal 7 as an initial state.

At this time, in the prior art, the microcomputer 1 was in an operating state, but in the present invention, the microcomputer 1 is in a standby state, so power consumption is reduced.

At this time, when an optical signal arrives and the optical signal receiving circuit 1 outputs an electrical signal 7, this electrical signal 7 is inputted to the input monitoring circuit 4 as an input signal. When the input monitoring circuit 2 receives the electrical signal 7 as an input signal, it changes the operation control signal 8 and immediately shifts the microcomputer 2 from the standby state to the operating state (receiving state).

The microcomputer 2 that has entered the operating state receives and processes the electrical signal 7, outputs the processing result to the output unit 3, and then
A counter reset signal 9 is sent to the input monitoring circuit 4 to start the reference clock counting operation of the counter included therein. After receiving the counter reset signal 9, the input monitoring circuit 4 waits for an input (waiting for the electric signal 7) for about 8 seconds (the period required for the counter to finish counting a predetermined number of reference clocks), and If the electric signal 7 is input again as the next input signal during that time, the microcomputer 2 that received and processed it will
Since the reset signal 9 is given, the human power monitoring circuit 4
Then, the counter in it is reset, and as a result, the operation control signal has no effect on the microcomputer 3.
continues to work.

If the electrical signal 7 is not input as an input signal within the above-mentioned reception waiting time (approximately 8 seconds), the reset signal 9 will not be given from the microcomputer 2, so the input monitoring circuit 4
The counter inside counts over, thereby changing the operation control signal 8, and the microcomputer 2 shifts to a stand-by state, and the power consumption is reduced.

FIG. 2 is a circuit diagram showing details of the input monitoring circuit 4 in FIG. 1.

In FIG. 2, 4l is a first stage counter, and 42 is a next stage counter. When the electrical signal 7 arrives as an input signal, it is input to the clear terminal CL of the next stage counter 42 of the input monitoring circuit 4 and immediately resets the counter 42, so that the operation control signal from the QC terminal is The level changes from the H (high) level to the L (mouth-) level, and the microcomputer 2, which had been in the stand-by state, shifts to the operating state.

Since the microcomputer 2 has entered the operating state, it receives and processes the electric signal 7 as an input signal, and when it finishes outputting the result, it outputs a counter recent signal 9, which is sent to the input monitoring circuit 4. The counter 41 is inputted to the clear terminal CL of the first stage counter 41 to reset the counter 41, so the counter 41 starts counting anew.

After that, if the next electric signal 7 does not arrive within the input signal waiting period of 8 seconds, for example, the microcomputer 2 will not output the counter reset signal 9, so the first stage counter 41 A predetermined number of clocks (the number that requires 8 seconds to complete counting) is counted and assigned, and the output is sent to the next-stage counter 42. Therefore, the next stage counter 42 receives this and increases the operation control signal from the QC terminal from the previous (low) level to the H level.
(high) level, leading the microcomputer 2 to a standby state. As a result, the microcomputer 2 enters a low power consumption state.

Next, when the electric signal 7 arrives as an input signal, the same thing as described above is repeated.

In this way, the microcomputer 2 is guided into an operating state when there is a human input signal and into a standby state when there is no human input signal, thereby reducing power consumption and extending the life of the power source (built-in battery) 5. .

〔Effect of the invention〕

According to the present invention, by using an input monitoring circuit that monitors an input signal for a certain period of time in the front stage of a reception processing microcomputer, the operation or non-operation (stand-high state) of the microcomputer can be switched depending on the presence or absence of an input signal. This makes it possible to reduce the power consumption of microcomputers and, by extension, equipment, and extend the life of the power supply.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 is a circuit diagram showing details of the input monitoring circuit in FIG. 1. Explanation of symbols 1... Optical signal receiving circuit, 2... Microcomputer (information processing device) 3... Output section, 4... Input monitoring circuit, 5... Power supply, 4 1, 4 2. ··counter.

Claims (1)

[Claims] 1) An optical signal receiving circuit that receives an optical signal, converts it into an electrical signal, and outputs it, and an information processing device that takes in the electrical signal from the optical signal receiving circuit, performs arithmetic processing, and outputs the result. An optical signal input type device comprising a counter circuit, and an electrical signal is repeatedly output from the optical signal receiving circuit at a period not exceeding a period in which the counter circuit counts a predetermined number of reference clocks. However, if the next electrical signal is not output from the optical signal receiving circuit even after the above-mentioned period has elapsed, this is detected and the information processing device is maintained in an operating state. 1. An optical signal input type device comprising an input monitoring circuit that detects the information processing device and prohibits the operation of the information processing device to lead the information processing device to a standby state with low power consumption.