JPH0456330B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a remote control device, and in particular, in addition to data input via a keyboard (hereinafter referred to as first data), data input without using the keyboard is input by the user. The present invention relates to a remote control device having a function of transmitting data (hereinafter referred to as second data) that can be set and changed from the outside.

[Conventional technology]

Conventionally, many remote control devices of this type have been proposed.

FIG. 4 is a block diagram of a conventional example of a remote control device.

The oscillation output of the oscillation circuit 1 is frequency-divided by the frequency divider circuit 2. The timing generator circuit 3 generates a timing signal from the output signal of the frequency dividing circuit 2.
The key scan circuit 4 outputs a scanning signal to a key switch group 11 having a plurality of key switches 12,
A key operation signal generated by operating the key switch 12 is decoded by the decoding circuit 5. The output 24 of the decode circuit 5 is latched by the data latch circuit 6, and the output 25 of the decode circuit 5 and the output 26 of the data latch circuit 6 are input to comparison input terminals A and B of the comparison circuit 7, respectively.
Further, the output of the decoding circuit 5 is transmitted to the multiple press detection circuit 9.
The output 29 of the multiple press detection circuit 9 is input to the output enable terminal OE of the comparison circuit 7, and when multiple presses are detected, the output 28 of the comparison circuit 7 is inhibited (when a specific key is pressed multiple times). (If the button is pressed once, the data will be changed to the one pressed once and data transmission will continue.) The output control circuit 8 enters an output enable state when comparison inputs A and B of the comparison circuit 7 match and a match signal 28 is output, and the output control circuit 8 enters an output enable state when the comparison inputs A and B of the comparison circuit ₇ match and a match signal ₂₈ is output. Remote control signals corresponding to data 27 (output of data latch circuit 6) and 30 of No. 2 are output as first and second transmission data, respectively. The diodes 20 and 21 are connected between two of _{the key scan output terminals Y0 to Y7 , Y0} and _Y5 , and the data input terminal _D2 of the output control circuit 8, and generate second data 30. . Timing signal 3 for data latch circuit 6, comparison circuit 7, and output control 8
1, 32, and 33 are output from the timing generator 3.

The key operation signal is decoded and latched by the decoding circuit 5, and the latched signal 26
matches the decode output 25 being output at that time, and when multiple presses are not detected, the first transmission data is output. Further, data 30 generated by selecting the key scan signals Y ₀ to _{Y 7} by the diodes 20 and 21 is transmitted from the output control circuit 8 as second transmission data.

Figure 5 shows the first and sixth key scan outputs.
This is a second data waveform diagram when the diodes 20 and 21 are connected to Y ₀ and Y ₅ , and this signal is applied to the pull-down resistor connected to the input terminal D ₂ of the output control circuit 8. This waveform can be arbitrarily changed by the user by changing the position and number of diodes.

[Problem that the invention seeks to solve]

The conventional remote control device mentioned above is
The selection of the transmission data that can be changed by the user, that is, the second transmission data, was done by adding diodes, so depending on the data, the number of diodes added increased, increasing the cost.
Also, if you want to change the transmission data that has been set,
This method has the disadvantage that it is not economical because the application must be changed in order to change the position of the diode.

[Means for solving problems]

The remote control device of the present invention includes a switch, a fuse, which is disconnected when the control signal is at the first logic level, and connected when the control signal is at the second logic level.
The switch and the fuse ROM are connected in series, and one end of the series connection circuit is connected to one external signal input terminal, and the other end is connected to the other external signal via the resistor. an external signal input circuit connected to an input terminal and having an output point at a connection point between the series connection circuit and the resistor; and an external signal input circuit that outputs a predetermined scanning output of the key scan circuit when the control signal is at a first logic level. a first gate circuit that masks the scanning output when the logic level is 2;
The external setting data generation circuit includes a second gate circuit that inputs the output of the gate circuit and outputs the output to the output control circuit.

[Effect]

When transmitting the first data, by setting the control signal to the first logic level, the external signal input circuit can be turned off and keyboard input can be performed, and the external signal is transmitted as the second data. By setting the control signal to the second logic level, different data can be transmitted for when the fuse ROM is disconnected and when it is not disconnected. Furthermore, by controlling the phase and pulse width of the control signal, it is possible to generate second data by superimposing the key scan signal and the external signal in different phases and with different pulse widths.

In this way, by changing the logic level, phase, and pulse width of the control signal and further cutting the fuse ROM, the user can easily and freely change the second data.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the remote control device of the present invention, FIG. 2 is a circuit diagram of the external setting data generation circuit 10 of FIG. 1, and FIG. 3 shows the operation of each part of the circuit of FIG. FIG.

In this embodiment, an external setting data generation circuit 10 for generating second data is provided in place of the diodes 20 and 21 of the conventional remote control device shown in FIG.

In the external setting data generation circuit 10, the key scan output _Y0 is connected to the first column of the key matrix 11 via a clocked buffer 13. The clocked buffer 13 and the switch 16 are controlled by the same control signal 22.
When 2 is "1", the clocked buffer 13 is turned off and the switch 16 is turned on. switch 16,
The fuse ROM 18 and the resistor 15 are connected in series, and both ends thereof are connected to the terminals S ₁ and S ₂ .
This constitutes an external signal input circuit 20 which has an output point. External signals are applied to terminals S ₁ and S ₂ . The output point P of the external signal input circuit 20 and the output of the clock driver 13 are both connected to the input terminal of the buffer 14, and when the control signal 22 is "1", the external signal is ”, the key scan signal is input to the buffer 14 and output to the output control circuit 8. Therefore, even if the signal input to the buffer 14 from point P when the control signal 22 is "1" is an analog signal, it is output from the buffer 14 as a digital signal.

Next, the operation of this embodiment will be explained with reference to FIG.

When the fuse ROM18 is energized, the terminal _S1 ,
When a DC voltage higher than the threshold voltage of the buffer 14 is applied between _S2 (terminal _S2 is connected to the negative electrode), the clocked buffer 13 goes high during period T when the control signal 22 is "1". The DC voltage between the terminals S ₁ and S ₂ is applied to the input terminal of the buffer 14 . As a result, Batsuhua 14
outputs "1" during period T, and outputs a key scan signal during other periods. Therefore, the clocked buffer 13 receives the first row key scan output Y ₀
When inputting the signal and applying the sixth column key scan output _Y5 as the control signal 22 to the clocked buffer 13 and switch 16, the same waveform as shown in FIG. 5 is obtained (FIG. 3C). In the above case, when a part of one pulse (pulse width T ₁ ) of the first column key scan signal (D in FIG. 3) is applied as the control signal 22, the second data 30 (E in FIG. 3) is applied. is the period
At T ₁ (shaded area), terminals S ₁ and S ₂ are connected to the buffer 14.
Since the inter-voltage voltage is input, it has the same waveform as the first column key scan signal _Y0 . But Hughes
When the ROM 18 is disconnected, a waveform (FIG. 3F) obtained by inverting the first row key scan signal _Y0 during the period _T1 is obtained.

In this way, the control signal 22 is changed, and further,
By cutting the fuse ROM18, the second
The data 30 can be changed arbitrarily. Furthermore, the first and second data can be logically calculated and transmitted.

Note that normally, the input 30 of the output control circuit 8 is generated only by the output of the external signal input circuit 20. Further, in this embodiment, the external setting data generation circuit 10 is connected to the output of the first column of the key scan circuit 4, but it can also be connected to other key scan outputs.

〔Effect of the invention〕

As explained above, the present invention arbitrarily switches transmission of keyboard input data and data input without going through the keyboard using a control signal. By changing the phase and pulse width of the signal and cutting the fuse ROM, it is possible to provide a remote control device that allows the user to freely and easily change the transmitted data from the outside. be.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the remote control device of the present invention, FIG. 2 is a circuit diagram of the external setting data generation circuit 10 of FIG. 1, and FIG. 3 is a waveform showing the operation of the circuit of FIG. 2. 4 is a block diagram of a conventional example of a remote control device, and FIG. 5 is a diagram showing an example of second data of the device shown in FIG. DESCRIPTION OF SYMBOLS 1... Oscillation circuit, 2... Frequency division circuit, 3... Timing generator circuit, 4... Key scan circuit, 5... Decoding circuit, 6... Data latch circuit, 7... Comparison circuit, 8... Output control circuit , 9...multiple press detection circuit, 10...external setting data generation circuit, 11...key matrix, 12...
...Key switch, 13...Clocked buffer,
14... Buffer, 15... Resistor, 16... Switch, 18... Fuse ROM, 20... External signal input circuit, 22... Control signal, 24, 25...
Decode circuit output, 26...Data latch circuit output, 27...First data signal line, 28...Comparison circuit output, 30...Second data signal line, 31,
32, 33...Timing signal line, _S1 , _S2 ...External signal input terminal.

Claims (1)

[Claims] 1. In a remote control device having a function of outputting transmission data corresponding to data entered and decoded from a keyboard and data set from outside without using a keyboard, the control signal is the first control signal. is disconnected when the logic level of
It has a switch, a fuse ROM, a resistor, and an external signal input terminal that are connected at the second logic level, and the switch and the fuse ROM are connected in series, and one end of the series connection circuit is connected to one external signal input terminal. an external signal input circuit whose other end is connected to the other external signal input terminal via a resistor, and whose output point is the connection point between the series connection circuit and the resistor; At this time, the predetermined scanning output of the key scan circuit is output, and the second
a first gate circuit that masks the scanning output when the logic level is , and a second gate circuit that inputs the output of the external signal input circuit and the output of the first gate circuit and outputs it to an output control circuit. A remote control device characterized by having an external setting data generation circuit.