JPH04199404A - Control device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a control device designed to vary the voltage during the period when a switch is pressed and to keep the voltage constant when the switch is released. .

BACKGROUND OF THE INVENTION In recent years, microprocessors have been widely used to control equipment. In such devices, control is often used to continuously change the voltage while the switch is pressed and keep the voltage constant when the switch is released.0For example, in a television receiver, the volume switch Control is such that while the switch is held down, the volume continues to increase or decrease, and when the switch is released, the volume remains constant at that point.

An example of the conventional control device mentioned above will be described below with reference to the drawings. FIG. 2 shows functional blocks of a conventional control device.

In Figure 2, 1 is a binary switch of on and off, 2
3 is a Shemite trigger input circuit that eliminates chattering when switching switches; 3 is a microprocessor circuit that performs processing such as data input/output according to the control circuit program; 4
5 is an input port for inputting data to the microprocessor circuit 3; 5 is an output port for outputting data from the microprocessor circuit 3; 6 is an interrupt input section for inputting an interrupt processing request signal to the microprocessor circuit 3; 7 is an interrupt input port for inputting an interrupt processing request signal to the microprocessor circuit 3; ROM stores the control program, 8 is RAM used by the microprocessor circuit 3 for processing, 9 is a DA converter that converts digital data into analog voltage, 15 measures the cycle of inputting data from the input port 4 and generates a signal. This is a timer counter that is output to the interrupt input section 6. a is a signal line connecting the switch 1 and the Schmitt trigger input circuit 2; b is an input signal line connecting the Schmitt trigger input circuit 2 and the input port 4; C is an interrupt signal line connecting the timer counter 15 and the interrupt input section 6; d
is an output signal line that connects the output port 5 and the AD converter 9, e is an address and data bus that connects the microprocessor circuit 3, input port 4, output port 5, interrupt input section 6, ROM 7, and RAM 8, and f is an AD conversion line. This is the output terminal of the device 9.

The operation of the control device configured as described above will be explained below.

The timer count 15 outputs a signal to the interrupt input section 6 at regular intervals. The microprocessor circuit 3 reads the state of the switch 1 from the input port 4 every time there is an interrupt input. When the switch 1 is on, the microprocessor circuit 3 increases the data at the output port 5. Furthermore, when the switch 1 is in the off state, the microprocessor circuit 3 holds the data at the output port 5 constant. Output port 5
The data is changed into a voltage by the AD converter 9 and output from the output terminal f, so that while the switch 1 is pressed, the voltage at the output terminal f is increased, and when the switch 1 is released, the voltage at the output terminal f is increased. Control can be performed to keep the voltage of f constant.

Problems to be Solved by the Invention However, in the above configuration, the microprocessor circuit 3 is always input with the switch state at a constant cycle, so the microprocessor circuit 3 is occupied for a certain period of time regardless of the on/off state of the switch. do. Therefore, if there are a large number of switches or if there are many processes other than controlling the DA converter 9, there may be restrictions. The problem was that the n speed decreased.

In view of the above problems, the present invention provides a control device in which the control speed hardly decreases even if the number of switches or the number of objects to be controlled increases.

Means for Solving the Problems In order to solve the above problems, the control device of the present invention includes a binary switch of an on state and an off state, and a signal that is sent only once when the state of the switch changes from off to on. output,
In addition, there is a change detection means that repeatedly outputs a signal a certain number of times when the state changes from on to off, and a DA that converts a digitally specified value into an analog voltage and outputs it.
When a signal is input from the converter and the change detection means, the state of the switch is checked, and when the switch is in the on state, the value given to the DA converter is continuously changed, and when the switch is in the off state, the value given to the DA converter is continuously changed. Control means are provided for maintaining the numerical value applied to the converter at its current value.

Effect of the Invention With the above-described configuration, the present invention can read the switch state only when the switch state changes, so the load is reduced and the control speed is almost constant even if the number of switches or the number of restricted objects increases. There will be no decline.

Embodiment Hereinafter, a control device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows functional blocks of a control device in an embodiment of the present invention.

In Figure 1, 1 is a switch, 2 is a digital trigger input circuit, 3 is a microprocessor circuit, 4 is an input port, 5 is an output port, 6 is an interrupt input section, 7 is a ROM, 8 is a RAM, and 9 is an AD converter. The above configuration is the same as that of FIG. 2 showing the functional blocks of a conventional control device. 10
11 is a rising edge detection circuit that outputs a signal when the state of switch 1 changes from off to on; 11 is a falling edge detection circuit that outputs a signal when the state of switch 1 changes from on to off; 12. 13 and 14
is a delay circuit that delays an input signal by a certain amount of time and outputs the delayed signal.

a is a signal line connecting switch l and Schmint trigger input circuit 2, b is a signal line connecting switch L and Schmint trigger input circuit 2 and input port 4
d is an output signal line that connects the output port 5 and the AD converter 9, e is the input signal line that connects the microprocessor sensor circuit 3, input port 4, output port 5, interrupt input section 6, ROM 7, R
Address bus and data bus connecting AM8, f is A
Output terminal of D converter 9, g is Schmint trigger input circuit 2
A signal line connects the rising edge detection circuit 10 and the falling edge detection circuit 11, and h is the rising edge.

i is an interrupt signal line connecting falling edge detection circuit 11 and interrupt input section 6; j is an interrupt signal line connecting delay circuit 12 and interrupt input section 6; The connecting interrupt signal line k is an interrupt signal line connecting the delay circuit 14 and the interrupt input section 6.

The operation of the control device configured as described above will be explained below with reference to FIG.

First, when the state of the switch 1 changes from off to on, the change in the state of the switch l rises and the edge detection circuit 10
When a 0 interrupt signal is input, the interrupt signal is detected by the microprocessor circuit 3 and input to the interrupt input section 6.
reads the state of the switch from the input port 4. At this time, since the state of the switch 1 is on, the microprocessor sensor circuit 3 continuously increases the value of the output port 5. As a result, the output voltage of the DA converter 9 increases continuously.

Next, when the state of the switch 1 changes from on to off, the state of the switch l is detected by the falling edge detection circuit 11 and an interrupt signal is input to the interrupt input section 6. The interrupt signal is also input to the one-stage delay circuit 12 and the two-stage delay circuit 13.14, delayed in time, and input to the interrupt input section 6. In this way, when the state of the switch 1 changes from on to off, the interrupt signal will be input three times.9 The microprocessor circuit 3 to which the interrupt signal is input reads the state of the switch from the input port 4.
At this time, since the switch 1 is off, the microprocessor circuit 3 holds the value of the output port 5 constant.

As a result, the output voltage of the DA converter 9 is also held constant and output from the output terminal f.

The reason why the interrupt signal is input three times when switch 1 changes from on to off is because the interrupt signal is input only once when the state of switch 1 changes from off to on. This is because malfunctions that occur in these cases are given importance.

For example, in the case of a volume increase switch on a television receiver, if the on state is not recognized, the switch can be pressed again. However, if the off state is not recognized, the volume will continue to increase even though the switch is released.

In the case of the conventional example, the state of the switch is read out at regular intervals, so that even if a malfunction occurs, it can be recovered immediately. However, when detecting edges as in this configuration, it is practically necessary to consider the case of malfunction.

As described above, according to this embodiment, the switch 1, the rising edge detection circuit 10, and the falling edge detection circuit 1
1, delay circuits 12, 13, and 14, and input port 4,
By providing the interrupt input section 6, output port 5, AD converter 9, microprocessor circuit 3, RMA 7, and RAM 8, the state of the switch 1 is read out and turned on only when the state of the switch 1 changes. It is possible to control the output voltage by continuously increasing it when it is off and keeping it constant when it is off.

Effects of the Invention As described above, according to the present invention, there are two states, an on state and an off state.
a value switch, and a change detection means that outputs a signal only once when the state of the switch changes from off to on, and repeatedly outputs the signal a fixed number of times when the state changes from on to off. When a signal is input from the DA converter and the change detection means, the state of the switch is checked, and when the switch is on, the value given to the DA converter is continuously changed, and when the switch is off, the value given to the DA converter is continuously changed. By providing a control means that maintains the numerical value given to the DA converter at the current value, the number of times the switch status is read can be limited, the load is reduced, and the number of switches and the objects to be controlled can be reduced. Even if it increases, the control speed will hardly decrease.

[Brief explanation of the drawing]

FIG. 1 is a functional block diagram of a control device according to an embodiment of the present invention, and FIG. 2 is a functional block diagram of a conventional control device. 1...Switch, 3...Microprocessor circuit, 4...Input port, 5...
・Output port, 6... Interrupt input section, 7...
...ROM, 8...RAM, 9...A
D converter, 10... rising edge detection circuit, 11... falling edge detection circuit, 12.
13゜14... Delay circuit.

Claims (1)

[Claims] A binary switch of an on state and an off state, a signal is output only once when the state of the switch changes from off to on, and a signal is output only once when the state of the switch changes from on to off. A change detection means that repeatedly outputs a signal a certain number of times when a change occurs, and a DA converter that converts a digitally designated value into an analog voltage and outputs it, and when a signal is input from the change detection means, the state of the switch is determined. and a control means for continuously changing the numerical value given to the DA converter when in the on state, and maintaining the numerical value given to the DA converter at the current value when in the off state. A control device characterized by: