JP2003303049A - Input device of position data - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an input device of position data, which can always detect normal position information, even if an analog voltage is converted into abnormal digital data resulting from some possible cause. <P>SOLUTION: The input device is provided with: a position sensor 3 including a key switch 2 for switching the analog voltage 1 representing the position information; an A/D converter 4 for performing A/D conversion of the output of the position sensor 3; a data transfer circuit 9 for transferring the output data of the A/D converter 4 to storage means (5), (6); a depressing time measurement means 7 of a key switch 2 for controlling the A/D converter 4; and an open state detecting means 8 of the key switch 2 for controlling the data transfer circuit 9. The depression time measurement means 7 controls the start of the A/D converter 4 and data transfer circuit 9 at the point when detecting the depression of the key switch 2, and the open state detecting means 8 controls to stop the data transfer of the data transfer circuit 9 at the point when detecting the key switch 2. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for inputting position data, and more particularly to a device for using a graphical user interface (GUI) such as a computer or a mobile phone, for selecting a command displayed as a picture or a graphic. The present invention relates to a position data input device, which is generally called a pointing device.

[0002]

2. Description of the Related Art A conventional position data input device will be described below with reference to the drawings. FIG. 2 is a block diagram showing a circuit example of a conventional position data input device.

In FIG. 2, 11 is an analog voltage representing position information, 12 is a key switch, 13 is a position sensor,
Reference numeral 14 is an A / D converter, 15 is a register, 16 is a microprocessor, and an analog voltage 1 representing position information.
The input of the A / D converter 14 and the input of the pressing time measuring means 17 are connected to the position sensor 13 which is composed of the key switch 12 for switching 1.

As its operation, the pressing time measuring means 17
Compares the pressing time of the key switch 12 with a predetermined time, and sends a start signal to the A / D converter 14 when the key switch 12 is pressed for more than the predetermined time. A /
The D converter 14 uses the analog voltage 1 which is position information.
1 is started to be converted into a digital voltage, and when the conversion is completed, the data is transferred to the register 15. Thereafter, the microprocessor 16 reads the data in the register 15 to complete the series of processing of the position data.

[0005]

However, in such a configuration, when the command from the pressing time measuring means 17 is received, A
The analog voltage 11 indicating the position information by the / D converter 14
If the key switch 12 is always pressed while converting the
Is converted into a digital voltage, but the A / D converter 14
If the key switch 12 is opened for a short time within the conversion operation time (hereinafter referred to as the settling time), the analog voltage 11 and the input of the A / D converter 14 are in the open state, and the analog voltage representing the position information is displayed. There is a problem that an unstable analog voltage different from 11 is converted into digital data by the A / D converter 14 and finally transferred to the register 15.

The present invention solves the above-mentioned conventional problems. Even if the analog voltage is converted into abnormal digital data for some reason, normal position information can always be detected. An object is to provide an input device.

[0007]

A position data input device of the present invention is a position sensor including a key switch for switching an analog voltage representing position information, and an output of the position sensor is analog / digital (A / D). Convert A
An A / D converter, a data transfer circuit for transferring output data of the A / D converter to a storage means, and the A
The key switch pressing time measuring means for controlling the / D converter and the key switch open state detecting means for controlling the data transfer circuit are provided, and the pressing time measuring means detects the pressing of the key switch. A /
Start control of D converter and data transfer circuit,
The open state detecting means controls the data transfer of the data transfer circuit to be stopped when the open state of the key switch is detected.

According to the present invention, even if the key switch is opened for a short time and the analog voltage is converted into abnormal digital data, it has a function of stopping the data transfer to the register. Therefore, normal position information can always be detected.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the circuit configuration of an embodiment of the position data input device of the present invention.

In FIG. 1, 1 is an analog voltage, 2 is a key switch, 3 is a position sensor, 4 is an A / D converter, 5 is a register, 6 is a microprocessor, and the register 5 constitutes a data storage means. ing. 7
Is a pressing time measuring means of the key switch 2, 8 is an open state detecting means of the key switch 2, and 9 is a data transfer circuit.

As for the circuit configuration, with respect to the position sensor 3 composed of the key switch 2 for switching the analog voltage 1 representing the position information, the input of the A / D converter 4 and the input of the pressing time measuring means 7 and the open state. The input of the detection means 8 is connected. Further, the pressing time measuring means 7 controls the A / D converter 4 and the open state detecting means 8, and when the pressing time measuring means 7 detects the pressing of the key switch 2, the A / D converter 4 and the open state detecting means 8 are detected. These are controlled to start respectively. Upon receiving the start signal, the open state detecting means 8 starts to monitor the open state of the key switch 2, and when the key switch 2 opens, sends an open detection signal to the data transfer circuit 9,
The data transfer circuit 9 that has transferred the output of the A / D converter 4 to the register 5 is stopped and controlled. The microprocessor 6 reads data from the register 5 at an arbitrary timing.

The operation of the position data input circuit configured as described above will be described.

First, the pressing time measuring means 7 enters the detection state and starts monitoring the pressing state of the key switch 2 of the position sensor 3. Then, when the key switch 2 is pressed, the pressing time measuring means 7 starts measuring the pressing time, and sends a start signal to the A / D converter 4 when the set pressing detection time is exceeded. At the same time, a start signal is sent to the open state detecting means 8. Therefore, when the pressing of the key switch 2 is detected, the A / D converter 4 outputs the analog voltage 1
At the same time as converting the signal into a digital signal, the open state detecting means 8 starts monitoring the open state of the key switch 2. At this time, if the key switch 2 is not opened within the settling time of the A / D converter 4, the open state detecting means 8
Does not send an open detection signal to the data transfer circuit 9,
The data transfer circuit 9 transfers the digital data to the register 5 immediately after the conversion of the A / D converter 4 is completed.

Here, when the key switch 2 is opened within the settling time of the A / D converter 4, the analog voltage 1 and the input of the A / D converter 4 are opened, so that the A / D converter 4 is opened. Therefore, an unstable analog voltage different from the analog voltage 1 may be converted into digital data. However, in this case, the open state detecting means 8 monitors the open state of the key switch 2 for a time equal to or longer than the settling time of the A / D converter 4, whereby the open state detecting means 8 transfers the data. An open detection signal will be sent to the circuit 9. In response to the open detection signal, the data transfer circuit 9 stops transferring the abnormal digital data output converted by the A / D converter 4 to the register 5.
Therefore, when the key switch 2 is opened within the settling time of the A / D converter 4, the data in the register 5 is not updated and the data previously converted by the A / D converter 4 is stored.

When the conversion operation of the A / D converter 4 is completed, the next position data input starts, and the pressing time measuring means 7 enters the detection state again and starts monitoring the pressing state of the key switch 2 of the sensor 3. When the key switch 2 is pressed, the pressing time measuring means 7 starts to measure the pressing time, and when the set pressing detection time is exceeded, a start signal is sent to the A / D converter 4 and at the same time the open state detecting means 8 is released. Also, a start signal is sent to. Therefore, when the depression is detected, the A / D converter 4 starts converting the analog voltage 1 into a digital signal, and at the same time, the open state detecting means 8 starts monitoring the open state of the key switch 2. A /
If the key switch 2 is not opened within the settling time of the D converter 4, the open state detection means 8 does not send a detection signal to the data transfer circuit 9, so the data transfer circuit 9 completes the conversion of the A / D converter 4. Immediately after that, the digital data is transferred to the register 5.

By repeating such a series of operations, after the pressed state of the key switch 2 is detected, A /
When the key switch 2 is opened within the settling time of the D converter 4, no data is updated from the A / D converter 4 to the register 5 so that the data is not updated. And settling of the A / D converter 4
Data is transferred to the register 5 only when the key switch 2 is continuously pressed within the time, so that the microprocessor 6 can always read normal data.

As described above, according to the present embodiment, even if the analog voltage is converted into abnormal digital data, it has a function of stopping the data transfer to the data storage means. Therefore, normal position information can always be detected, and the microprocessor can always read a normal value.

[0018]

As described above, according to the present invention, even if the analog voltage is converted into abnormal digital data, it has a function of stopping the data transfer to the data storage means. Therefore, the advantageous effect that the normal position information can always be detected and the microprocessor can always read the normal value is obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing a circuit configuration in an embodiment of a position data input device of the invention.

FIG. 2 is a block diagram showing a circuit example of a conventional position data input device.

[Explanation of symbols]

1,11 Position information analog voltage 2,12 key switch 3,13 sensor 4,14 A / D converter 5,15 registers 6,16 microprocessor 7,17 Pressing time measuring means 8 Open state detection means 9 Data transfer circuit

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 5B068 AA05 DE03                 5B087 AA09 BB21 DJ09                 5K067 AA21 BB04 BB21 DD20 EE02                       FF03 FF23 HH22 KK15 KK17

Claims (2)

[Claims] 1. A position sensor including a key switch for switching an analog voltage representing position information, an A / D converter for analog / digital (A / D) converting the output of the position sensor, and an A / D converter. A data transfer circuit for transferring the output data to the storage means, means for measuring the pressing time of the key switch for controlling the A / D converter, and means for detecting the open state of the key switch for controlling the data transfer circuit. The pressing time measuring means controls the start of the A / D converter and the data transfer circuit when the pressing of the key switch is detected, and the open state detecting means transfers the data when the opening of the key switch is detected. A position data input device characterized in that the data transfer of a circuit is controlled to be stopped. 2. The open state detecting means is a fixed time within the A / D conversion operation time of the A / D converter or the A / D.
The position data input device according to claim 1, wherein the position data input device operates for a time longer than a conversion operation time.