JPH03124128A - Radio equipment press switch control circuit - Google Patents

Abstract

PURPOSE:To restore a processor to normal operation automatically even when the processor malfunctions or runs away by resetting the processor continuously till a preset prescribed time elapses from the time when a power supply voltage is reduced to a specified value or below. CONSTITUTION:When the transmission state of a press-on signal is continued due to malfunction or runaway of a processor 1, A timer circuit 3 counts time by a trigger signal inputted from a waveform shaping circuit 2. The timer expires when 1 preset prescribed time elapses and an output of a control signal from the timer circuit 3 is automatically stopped at that point of time. The control signal is fed to a driver circuit 4 and a press switch of a radio equipment is controlled. Thus, even when the press-on signal is not reset, the press switch is automatically reset when a prescribed time elapses and the continuous transmission state of the radio equipment is prevented.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a radio press switch control circuit that controls on/off of a radio press switch using a press-on signal from a processor.

[Conventional technology]

FIG. 3 is a block diagram showing a conventional radio press switch control circuit disclosed in, for example, Japanese Unexamined Patent Publication No. 64-17520. A processor that sends out continuous press-on signals to perform press-on operations, and is composed of, for example, a microcomputer. 2 is this processor 1
When the press-on signal is input from the processor 1, the waveform shaping circuit converts it into a trigger signal and outputs it. A timer circuit 3 is connected to the waveform shaping circuit 2 and is activated by a trigger signal to generate a control signal for limiting the press-on duration based on a preset time limit. Further, the press-on signal from the processor 1 is also directly input to the timer circuit 3, bypassing the waveform shaping circuit 2. 4 is this timer circuit 3
It converts the control signal from the timer circuit 3 into a signal with sufficient voltage to control the press switch of the radio device (not shown), and converts the control signal from the timer circuit 3 into a signal with sufficient voltage to control the press switch of the radio device (not shown). This is a driver circuit that outputs to the press line. Next, the operation will be explained. When turning on the press switch of a radio, the processor 1 first sends out a press-on signal that lasts for the desired time to keep the press switch on. This press-on signal is input to the waveform shaping circuit 2, where the waveform is shaped, converted into a trigger signal, and sent to the timer circuit 3. The timer circuit 3 is activated by this trigger signal, outputs a control signal to the driver circuit 4, and starts time counting. Here, if the press-on signal from the processor 1 is turned off before the timer circuit 3 times up, the timer circuit 3 stops outputting the control signal in accordance with the press-on signal directly input from the processor 1. The control signal generated by the timer circuit 3 in this manner is sent to the driver circuit 4. The driver circuit 4 converts the input control signal into a signal with sufficient voltage to turn on the press switch of the radio, and outputs it to the press line to the press switch of the radio. The on/off state of the press switch of the radio is controlled by this signal; it is turned on when this signal is given, and turned off when this signal is cut off. Furthermore, if an abnormality in the power supply to processor 1 causes the power supply voltage to drop instantaneously and processor 1 malfunctions or goes out of control, the press-on signal sent by processor l will not be stopped and the sending state will continue. Sometimes it remains. In such a case, the timer circuit 3 starts time counting by the trigger signal input from the waveform shaping circuit 2, and when a preset predetermined time elapses, the timer circuit 3 times up and automatically stops outputting the control signal. . Therefore, the on/off control of the press switch of the wireless device is performed by a signal based on this control signal converted into a specified voltage by the driver circuit 4, so that the processor 1 is Even if the press-on signal cannot be turned off due to malfunction or runaway, the press switch will be automatically turned off after a predetermined period of time, and the radio will not enter a continuous transmitting state.

[Problem to be solved by the invention]

Since the conventional radio press switch control circuit is configured as described above, it is possible to prevent the radio from entering a continuous transmitting state due to a malfunction or runaway of the processor 1. To restore operation, the user must switch the power supply to processor 1 to -H.
There was a problem in that it was necessary to turn off the processor 1 and start up the processor 1 again. This invention was made in order to solve the above-mentioned problems, and is a wireless press switch control that can automatically return to normal operation after a malfunction or runaway of the processor without any user operation. The purpose is to obtain a circuit.

[Means to solve the problem]

The radio press switch control circuit according to the present invention includes a low voltage detection circuit that detects that the voltage of the power supply supplied to the processor has fallen below a predetermined voltage value, and a reset signal that resets the processor. of,
A reset signal generation circuit is provided that continuously outputs a signal until a preset time based on a detection signal generated by the low voltage detection circuit.

[Effect]

The reset signal generation circuit in this invention receives the detection signal generated by the low voltage detection circuit when it detects that the voltage of the power supply to the processor has fallen below a predetermined voltage value set in advance. By outputting a reset signal that is activated by a detection signal and continues to perform reset control of the processor until a predetermined time has elapsed, the processor can return to normal operation after malfunction or runaway. To realize a radio press switch control circuit that can automatically perform the return.

【Example】

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 1 is a processor, 2 is a waveform shaping circuit, 3 is a timer circuit, and 4 is a driver circuit, and since these are the same or equivalent parts to those of the conventional circuit with the same reference numerals in FIG. 3, a detailed explanation will be given. Omitted. Further, 5 is a low voltage detection circuit that monitors the voltage of the power supply supplied to the processor 1 and generates a detection signal when it detects that the power supply voltage has decreased below a predetermined voltage value set in advance. . Reference numeral 6 is formed by a timer activated by a detection signal generated by this low voltage detection circuit 5, and is connected between the processor 1 and this low voltage detection circuit 5, and is connected to the detection signal from the low voltage detection circuit 5. This is a reset signal generation circuit that continuously outputs a reset signal for controlling the reset of the processor 1 until a preset time has elapsed after being activated by the signal. Next, the operation will be explained. If there is no abnormality in the power supply being supplied to the processor and the power supply voltage is higher than a predetermined voltage value, the low voltage detection circuit 5 will not output a detection signal to the reset signal generation circuit 6. The reset signal generation circuit 6 is activated by this detection signal, and if no detection signal is input, it maintains an off state and does not output a reset signal to the processor 1. In this state, processor l operates normally and the third
It operates in the same way as the conventional case shown in the figure. That is, the press-on signal output from the processor l is waveform-shaped by the waveform shaping circuit 2, converted into a trigger signal, and sent to the timer circuit 3. The timer circuit 3 is activated by this trigger signal, outputs a control signal to the driver circuit 4, and starts time counting. processor 1
When the press-on signal from the press-on signal turns off, the timer circuit 3 stops outputting the control signal in accordance with the press-on signal. The driver circuit 4 converts the control signal from the timer circuit 3 into a signal with sufficient voltage to turn on the press switch of the radio, outputs it to the press line, and controls the on/off of the press switch of the radio. . Here, if the press-on signal continues to be sent due to a malfunction or runaway of the processor l due to an instantaneous voltage drop in the power supply, etc., the timer circuit 3 receives the trigger signal input from the waveform shaping circuit 2. After the time count is started, the time is up when a predetermined time period has elapsed, and the output of the control signal from the timer circuit 3 is automatically stopped at that point. This control signal is sent to the driver circuit 4, converted into a signal of a specified voltage, and sent to the press line, and the press switch of the radio is controlled by this signal. Therefore, even if the press-on signal cannot be turned off due to a malfunction or runaway of the processor I, the press switch is automatically turned off after a predetermined period of time, and the wireless device is prevented from entering a continuous transmitting state. Furthermore, such a voltage drop in the power supply supplied to the processor 1 is detected by the low voltage detection circuit 5. That is, when detecting that the voltage of the power supply supplied to the processor l has become below a predetermined voltage value, the low voltage detection circuit 5 generates a detection signal and sends it to the reset signal generation circuit 6. . The reset signal generation circuit 6 is activated by the detection signal from the low voltage detection circuit 5, and is activated by the detection signal from the low voltage detection circuit 5.
Generates a reset signal to control the reset. The reset signal generation circuit 6 starts time counting at the same time as it is activated, and sends out this reset signal until a preset predetermined period of time elapses and the time is up. The processor 1 is reset-controlled by this reset signal, and when the predetermined period of time has elapsed and the reset signal from the reset signal generation circuit 6 stops, the reset control is canceled. Thereafter, the processor 1 automatically resumes operation from the initial state based on a pre-built-in program. Here, if the set times of the timer circuit 3, the reset signal generation circuit 6, and the set voltage of the low voltage detection circuit 15 are appropriately selected, there will be no problem at all in normal operation. In addition, in the above embodiment, the control of the press switch of the radio device is executed regardless of the time, but it is also possible to set a time limit on the control of the press switch of the radio device. FIG. 2 is a block diagram showing such an embodiment. In this figure, the same or corresponding parts as those in the embodiment shown in FIG. 1 are given the same reference numerals, and their explanations are omitted. Also,
In the figure, 7 is a switch circuit that controls passage of a signal output from the driver circuit 4 to the press line. 8 constantly generates 24-hour repetitive time information,
This clock circuit generates operation start information and operation end information based on this repetition time information and supplies them to the switch circuit 7. Next, the operation will be explained. The clock circuit 8 is preset with a start time that permits operation after that time, and an end time that prohibits operation after that time. The clock circuit 8 generates operation start information and supplies it to the switch circuit 7 when the constantly generated repetitive time information reaches the set start time. The switch circuit 7 is closed by this operation start information and connects the driver circuit 4 to the press line. The subsequent operation is similar to that of the embodiment shown in FIG. Furthermore, when the end time set in the repetition time information reaches the end time, the clock circuit 8 generates an operation end signal and outputs it to the switch circuit 7. The switch circuit 7 receives this operation end signal and opens, cutting off the connection between the driver circuit 4 and the press line. Therefore, the signal from the driver circuit 4 based on the press-on signal subsequently sent out from the processor 1 is not output to the press line, and on/off control of the press switch of the radio is prohibited. In this way, it is possible to limit the control of the press switch of the radio to only the period from the start time to the end time set in the clock circuit 8.

【Effect of the invention】

As described above, according to the present invention, from the time when it is detected that the power supply voltage supplied to the processor has decreased to a specified value or less until the predetermined time set in advance has elapsed, the processor continues to operate. Since the wireless press switch control circuit is configured to reset, even if the processor malfunctions or goes out of control, it is possible to obtain a radio press switch control circuit that can automatically return to normal operation without any operation by the user.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a radio press switch control circuit according to an embodiment of the present invention, FIG. 2 is a block diagram showing another embodiment of the invention, and FIG. 3 is a conventional radio press switch control circuit. FIG. 1 is a processor, 5 is a low voltage detection circuit, and 6 is a reset signal generation circuit. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] A processor that sends out a press-on signal for controlling a press switch of a wireless device; and a processor that detects that the voltage of a power supply supplied to the processor has fallen below a predetermined voltage value and generates a detection signal. a low voltage detection circuit; and a reset signal for resetting the processor based on a detection signal generated by the low voltage detection circuit;
A radio press switch control circuit comprising a reset signal generation circuit that continuously outputs until a preset time.