JPH0139276B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a remote control device, and more particularly to a remote control device in which transmission data is configured by a mask ROM.

Many conventional remote control devices have been proposed, but the conventional remote control device 10 shown in FIG.
a frequency divider circuit 12 that divides the frequency of the oscillation signal by 1/N; a timing generator circuit 13 that generates a timing signal based on the output signal of the frequency divider circuit 12; and a key switch group 21 that includes a plurality of key switches 21a and 21b. A key scanning circuit 14 outputs a scanning signal to the key switch group 21, a decoding circuit 15 inputting a key operation signal obtained by pressing the key switch 21a, and a data latch circuit 16 latching a decoded signal obtained by decoding the key operation signal. , a multiple press detection circuit 9 for detecting a signal obtained from the decoding circuit 15 when a key switch is pressed multiple times, a comparison circuit 17 for comparing the outputs of the decoding circuit 15 and the data latch circuit 16, and the comparison circuit 1.
According to the results of step 7, the output control circuit 18 is configured to send out the output signal of the data latch circuit 16, and the key scan pulse is repeatedly output according to the number of keys to be used in accordance with the key scan signal from the key scan circuit 14. The key scan circuit 14 defines the period from the rise of the first key scan signal to the fall of the final pulse of one key scan cycle as one key scan cycle,
Let it be M seconds. When the key switch group 11 is operated, a key scan signal from the key scan circuit 14 is sent to the decoding circuit 15 as a key signal corresponding to the operated key switch. The decode circuit 15 generates data corresponding to the key signal, and supplies the decode signal to the data latch circuit 6 for latching.

After arbitrary M seconds (one key scan cycle), the key signal corresponding to the same key switch as described above is taken into the decoding circuit 5, and the decoded data and the data latched in the data latch circuit 6 are compared to the comparison circuit 17. When a data match is detected, the output control circuit 18 outputs the latched key signal to the remote signal 12.
is outputted from the terminal 20, and if no data match is obtained, the latched signal is not sent to the output control circuit 18 as a key signal.

Note that the multiple pushout detection circuit 19 prohibits data comparison and sends an output prohibition command to the output control circuit 18 when the key switch group 21 is pressed multiple times.

Through this series of operations, the conventional remote control device transmits a remote signal corresponding to the operated key switch, but since the remote signal is obtained by a combination of the logic of the decoding circuit 5 and the timing generator circuit 3, it is difficult to convert it into an IC. In this case, the key switch and remote signal remain fixed in a one-to-one relationship and cannot be changed.

Therefore, with conventional remote control devices, only limited remote signals can be obtained, and the types of receiving devices are limited.

Conventional remote control devices are used in television receivers, audio devices, and the like, but while the number of these devices continues to increase, they have the disadvantage that remote signals are limited as described above.

An object of the present invention is to eliminate such drawbacks in conventional remote control devices and to provide a highly versatile remote control device.

According to the present invention, there is provided a timing generator circuit that outputs a plurality of timing signals, a key switch group having a plurality of key switches, a key scan circuit that scans the key switch group, and a decoder circuit that decodes a key signal obtained by pressing a key switch. a data latch circuit that latches a decode signal, a comparison circuit that compares an output signal of the decode circuit with the data latch signal, and an output control circuit that outputs a remote signal corresponding to the key switch signal according to the result of the comparison circuit. There is obtained a remote control device having a mask ROM which uses output data from a data latch circuit as an address signal and outputs a data signal corresponding to the signal to the output control circuit.

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

FIG. 2 is a block diagram of one embodiment of the present invention. In FIG. 2, one embodiment of the present invention includes an oscillation circuit 31 that oscillates at an arbitrary frequency fo, and an oscillation circuit 31 that oscillates at an arbitrary frequency fo.
A key switch has a frequency divider circuit 32 that divides the frequency of the frequency divider circuit 32, a timing generator circuit 33 that receives the frequency division signal of the frequency divider circuit 32, outputs a plurality of timing signals, and supplies them to each part, and a plurality of key switches 41a and 41b. group 41 and the key switch group 4
1, a decode circuit 35 that decodes the key signal from the key switch, a data latch circuit 6 that latches the decoded signal, a comparison circuit 37 that compares the decoded signal with the data latch signal, and the latch circuit 35 that decodes the key signal from the key switch. A mask (ROM) storage device 50 that changes the output signal of the circuit, an output control circuit 8 that outputs the output signal of the mask ROM corresponding to the key signal caused by pressing the key switch, and an output signal of the decoding circuit 35 to detect multiple presses. It also includes a multiple press detection circuit 9 that outputs the output signal to a comparison circuit 37 .

As shown in FIG. 3, the mask ROM is composed of an address select circuit 51, a memory cell 52, etc., the address select circuit 51 has m address lines, is connected to the data latch circuit 36, and the memory cell 52 is It has n output lines,
It is connected to the output control circuit 38. This mask ROM is made by writing information 52a, 52b, . . . on a mask used in the manufacturing process, and is configured to send out a data code as a remote signal.

Next, the operation of one embodiment of the present invention will be described.

In this embodiment, an oscillation signal oscillated at an arbitrary frequency fo from an oscillation circuit 31 is divided into 1/N by a 1/N frequency dividing circuit 32.
The signal is frequency-divided into a timing signal and supplied to the timing generator circuit 33. The timing signal from the timing generator circuit 33 is supplied to each circuit, and the key scan circuit 34 uses this timing signal to generate a key scan signal. This key scan signal is repeatedly output as key scan pulses of the same number or more than the number of keys used, and one key scan cycle of Q key scan pulses is M seconds.

When one of the key switches in the key switch group 41 is selected and pressed, a key signal corresponding to the pressed key switch is sent to the decoding circuit 35. The decode circuit 35 sends data corresponding to the sent key signal to the data latch circuit 36, where the data is latched. The data latched in the data latch circuit 36 is stored in the mask ROM 50.
sent to.

In the mask ROM 50, as shown in FIG. 3, a decode signal composed of m bits is supplied to the address select circuit 51.
Memory cell 2 is accessed from memory cell 1. In the memory cell 52, each cell 52a, 5
Since 2b is provided in advance, a remote signal consisting of n bits is generated on n output lines accordingly.

On the other hand, after arbitrary M seconds, the key scan circuit 34
The above-mentioned key scan pulse is generated, the key switch being pressed is selected by the same operation, and the data corresponding to the key switch is sent to the decoding circuit 35.
supply to. Based on this, the comparator circuit 37 compares the data previously latched by the data latch circuit 36 with the data from the decode circuit 35 after M seconds. When the comparison circuit 37 detects data matching, it sends the matching signal to the output control circuit 38. Output control circuit 38
Then, the n-bit data converted by the mask ROM 50 is taken in and sent out via the terminal 40 as a remote signal.

The multiple press detection circuit 39 is connected to the key switch group 11.
When the button is pressed multiple times or by chattering, data comparison in the comparison circuit 37 is prohibited. Therefore, the comparator circuit 37 puts the output control circuit 8 into an output inhibited state.

As described above, in this embodiment, the remote signal output from the output control circuit is applied to the mask ROM 50 selected by the output signal of the data latch circuit 36.
Therefore, even if the output of the data latch circuit 36 is the same, the mask ROM 50
By changing the position of the gate, that is, the transistor, it is possible to arbitrarily change the remote signal.

Note that the mask ROM 50 can have any number of address signals and any number of data signals, so as the number of data signals increases, the number of data combinations increases, and if the number of data signals is n, then the number becomes 2n. , The number of addresses is also determined by the number of address signals, and if it is m, then 2m addresses can be selected.

As explained above, the present invention allows the remote signal to be changed arbitrarily using the mask ROM, and has the effect of providing a highly versatile device.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing a conventional remote control device, Fig. 2 is a block diagram showing an embodiment of the present invention, and Fig. 3 is a diagram showing a mask ROM and its peripheral circuits used in an embodiment of the present invention. . 31... Oscillation circuit, 32... Frequency dividing circuit, 33...
...Timing generator circuit, 34...Key scan circuit, 35...Decode circuit, 36...Data latch circuit, 37...Comparison circuit, 38...Output control circuit, 39...Multiple press detection circuit, 40...Remote signal Output terminal, 41...Key switch group, 50...Mask ROM, 51...
Address select circuit, 52...memory cell.

Claims (1)

[Claims] 1. A timing generator circuit that outputs a plurality of timing signals, a key switch group having a plurality of key switches, a key scan circuit that scans the key switch group in response to the timing signal, and a key signal that is obtained by operating the key switch. A decode circuit that latches the decode signal from the decode circuit, a data latch circuit that latches the decode signal from the decode circuit, and compares the decode signal from the decode circuit obtained by scanning the key switch group for the second time with the data latch signal of the data latch circuit. a comparison circuit that generates a match signal when the match signal is matched; an output control circuit that outputs the supplied key data signal as a remote signal in response to the match signal; and an output control circuit that outputs the supplied key data signal as a remote signal in response to the match signal; a mask that supplies a data signal corresponding to the signal to the output control circuit as the key data signal;
A remote control device characterized by having a ROM.