KR960010922B1 - Apparatus for transforming - Google Patents

Abstract

a key matrix circuit(20) having several keys; a micom(10) to control the key input-processing and the key operation execution of the key matrix circuit(20); and a memory part(30) to store the execution code and the addresses of the program execution according to each execution code. The micom(10) comprises: a RAM(10C) to store data from the memory part(30) temporarily; and a data I/O part(10F) to perform data exchange with the external circuit.

Description

Key Matrix Key Change Device

1 is a schematic block diagram of an apparatus for changing a key function of a key matrix according to the present invention.

2 is a detailed block diagram of a key function changing apparatus of a key matrix according to the present invention.

3 is a waveform diagram showing a scan pulse output for explaining the kisscan method of the present invention.

4 is a diagram for explaining an operation of loading data into the RAM from the memory unit of FIG. 2 during an initialization operation.

* Explanation of symbols for main parts of the drawings

10: Micom 10A: CPU

10B: ROM 10C: RAM

10D: scan data input unit 10E: scan pulse output unit

10F: data I / O section 20: key matrix circuit

30: memory

The present invention relates to a key function changing device of a key matrix, and more particularly, it is possible to implement various various functions on the same key matrix circuit board by changing a key operation defined on a key matrix outside of a general electronic device. It relates to a key function changing device of a key matrix.

A conventional key input device for inputting a plurality of keys includes a key matrix provided with a plurality of keys, and a microcomputer for controlling key input processing and key operation. When each key on the key matrix circuit is operated, the microcomputer performs a control operation by a unique execution code stored in the internal ROM corresponding to the key. That is, when a key is input, the execution code corresponding to the key is decoded and the jump to the corresponding function processing routine is performed to control the key operation corresponding to the corresponding tee.

In this case, since the execution code is stored in the internal ROM of the microcomputer for each key defined on the key matrix, the key matrix circuit board may be changed when the product option or design specification is changed and the existing key position and arrangement are changed. There is a problem that needs to be changed.

Accordingly, the present invention has been made in view of the above circumstances, and it is possible to change a key operation defined on a key matrix circuit, so that various functions can be implemented on a key matrix circuit board. The purpose is to provide.

According to a preferred embodiment of the key operation changing device of the key matrix according to the present invention for achieving the above object, a key matrix circuit having a plurality of keys installed therein, and controlling key input processing and key operation execution of the key matrix circuit. A key input device having a microcomputer for computing, comprising: a memory unit for storing an execution code and an execution address of a program corresponding to each code in advance, wherein the microcomputer temporarily stores data from the memory unit And RAM 1/0 unit for data exchange with an external memory unit.

Here, the microcomputer receives the execution code and the program execution address data from the memory unit during the initialization operation and stores the data from the n address of the internal RAM. Decodes the code, compares the decoded key input data with data from n address of the RAM to check whether there is the same code, and if the same data exists, reads the corresponding execution address and executes the program with the corresponding execution address. It is desirable to be able to jump. In the case where the key arrangement on the key matrix circuit is to be changed, it is preferable to change any one of the execution code stored in the memory unit and the execution address data corresponding to the code.

According to the present invention configured as described above, since an external memory unit is separately provided outside the microcomputer, the definition of the key of the key matrix circuit can be changed by changing the key code of the external memory or the execution code.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic block diagram of a key function changing apparatus of a key matrix according to the present invention, and FIG. 2 is a block diagram showing each configuration of FIG.

In the drawings, their operation in the conventional manner in the microcomputer 10 and the key matrix 20 is as follows. As shown in FIG. 3, the scan pulse output unit 10E of the microcomputer 10 sequentially outputs the scan pulses to the key matrix circuit 20, and the keys K0 to K15 of the key matrix circuit 20. FIG. When is pressed (when there is a key input), the state of the scan data of the corresponding column is reversed. In this case, when the data of the corresponding key is inverted, the microcomputer 10 uses a combination of output scan pulse data and input scan data. It is code aware. If the key K2 of the key matrix circuit 20 is pressed, the scan data inputs are all low level when the data of the first row is output, and the scan data inputs are all low level even when the second row is output, and the third row is When this output is made, the ports ① of the scan data input section 10B are high level and the ports ②, ③, ④ of the scan data input section become low level. When one of the input ports becomes high level in this way, the key codes are combined in the following manner. That is, scan pulse output (0100) + scan data input (0001) = key code (0100 0001). Therefore, the microcomputer 10 performs the operation by referring to the key code in the ROM table of the internal ROM 10B.

The microcomputer 10 of the apparatus of the present invention is provided with a RAM 10C for temporarily storing data and a data 1/0 unit 10F for exchanging data with the external memory unit 30. In the present invention, the executable code is not stored in the ROM 10B of the microcomputer 10, and can be written and erased. Is stored in advance.

In the present invention configured as described above, the kisscan method of the conventional key input device is the same, but there is a difference in the method of referring to the ROM table in the input keyload.

That is, during the reset operation, the microcomputer 10 inputs a table (ie, execution code and program execution address data) for key codes through the external memory unit 30 through the data 1/0 unit 10E. As shown in Fig. 4, the data is temporarily stored in the internal RAM 10C from address n to address m4-ml, where m is the maximum number of operable keys.

Here, each address of the RAM 10C is defined as follows, for example, in the case of a television set in advance. In other words,

When the key input is made in the key matrix circuit 20 while the execution code and the program execution address data are loaded into the RAM 10C, the CPU 10 outputs the scan pulse output unit 10E and the scan data input unit. The current keycode is decoded from the input data of 10D. Thereafter, the CPU 10 compares the decoded key input data with data from address n of the RAM 1OC to check whether there is the same code. If the same data exists, the corresponding execution address is read and the program execution is jumped to the corresponding execution address. On the other hand, if the same code does not exist, it is determined as an invalid key and the key input is ignored.

If the key arrangement on the key matrix circuit 20 is changed, the execution address data or the execution code may be changed among the execution code stored in the memory unit 30 and the execution address data corresponding to the code. .

That is, the content stored in the specific address of the memory unit 30 will be described by taking an example as shown in Table 1 below.

As described above, according to the present invention, since the definition of the key of the key matrix circuit can be changed by changing the key code of the external memory unit separately installed outside the microcomputer or the execution code, the key position can be changed in various ways on the same circuit board. have.

Claims (4)

In a key input device comprising a key matrix circuit 20 provided with a plurality of keys and a microcomputer 10 for controlling key input processing and key operation execution of the key matrix circuit 20, the execution code and each code And a memory unit 30 for storing the execution address of a program corresponding to the memory in advance, wherein the microcomputer 10 includes a RAM 10C for temporarily storing data from the memory unit 30; And a data 1/0 unit (10F) for exchanging data of the external memory unit (30). The microcomputer 10 of claim 1, wherein the microcomputer 10 receives the execution code and the program execution address data from the memory unit 30 during an initialization operation and loads the data from the n address of the internal RAM 110C. 20 decodes the current keycode from the can pulse output and scan data input upon key input, and compares the decoded key input data with data from address n of the RAM 10C to see if the same code exists. And, if the same data exists, read the corresponding execution address and jump the program execution to the corresponding execution address. The method according to claim 1, wherein when the key arrangement on the key matrix circuit 20 is changed, any one of the execution code stored in the memory unit 30 and the execution address data corresponding to the code is changed. Key matrix key function change device characterized in that. The key function changing apparatus according to any one of claims 1 to 4, wherein the memory unit (30) is made of an EEPROM.