CN201017282Y - Frequency transformator keyboard circuit - Google Patents
Frequency transformator keyboard circuit Download PDFInfo
- Publication number
- CN201017282Y CN201017282Y CNU2006201625970U CN200620162597U CN201017282Y CN 201017282 Y CN201017282 Y CN 201017282Y CN U2006201625970 U CNU2006201625970 U CN U2006201625970U CN 200620162597 U CN200620162597 U CN 200620162597U CN 201017282 Y CN201017282 Y CN 201017282Y
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- circuit
- gating
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Abstract
The utility model provides a converter keyboard circuit, which solves the problem that the single-chip input/output ports may be not enough if key stroking and display functions are to be implemented in a keyboard circuit in the prior art. The converter keyboard circuit provided in the utility model comprises: a keyboard single-chip, which comprises a group of nixie tube segment drive ports and a group of keyboard scan circuits connected to the multiplexed terminals of the keyboard single-chip; a gating chip, which comprises a group of nixie tube gating input terminals and a group of nixie tube gating signal output terminals; the nixie tube gating input terminals are connected to the multiplexed terminals of the keyboard single-chip. In the utility model, the scan circuit and the nixie tube gating circuit multiplex the same group of single-chip ports, and key stroking and display functions are implemented via one port of the single-chip.
Description
Technical field
The utility model relates to frequency converter, specifically, relates to a kind of frequency converter keyboard circuit.
Background technology
Frequency converter is a kind of application product very widely.In order to realize that frequency converter is carried out some controls and selection, frequency converter is equipped with keyboard usually, and the keyboard of frequency converter is mainly realized connecing key operation and shown two functions.Because the I/O terminal number amount of the single-chip microcomputer that uses in the keyboard circuit is limited, in the time of realizing button simultaneously and show two functions in keyboard circuit, the not enough problem of single-chip microcomputer input/output end port quantity can appear.
The utility model content
Therefore, the purpose of this utility model is to provide a kind of frequency converter keyboard circuit, and this circuit is realized button and Presentation Function by by multiplexing single-chip microcomputer delivery outlet.
According to above-mentioned purpose, frequency converter keyboard circuit of the present utility model comprises:
Keyboard microcontroller comprises that one group of charactron field drives port and one group of multiplexing end;
Keyboard scanning circuit links to each other with the multiplexing end of described keyboard microcontroller;
The gating chip comprises one group of charactron gating input end and one group of charactron gating signal output terminal; This charactron gating input end links to each other with the multiplexing end of described keyboard microcontroller.
In above-mentioned frequency converter keyboard circuit, described sweep circuit comprises the button branch road of many parallel connections, and every branch road comprises that diode of series connection and one are by strong.
In above-mentioned frequency converter keyboard circuit, described sweep circuit comprises 6 button branch roads.
As mentioned above, in the utility model, sweep circuit and charactron gating are multiplexing same group of one-chip machine port utilizes a port of single-chip microcomputer, realized button and Presentation Function.
Description of drawings
Fig. 1 shows frequency converter keyboard circuit of the present utility model.
Embodiment
See also Fig. 1, Fig. 1 is frequency converter keyboard figure of the present utility model.This frequency converter keyboard circuit comprises: keyboard microcontroller 10, sweep circuit 20 and gating chip 30.
Sweep circuit 20 includes many button branch roads, and every button branch road comprises a diode and a button, and diode and button are connected in series, the parallel connection of every button branch road.Sweep circuit 20 is also connected to the P3.5 and the P3.7 port of single-chip microcomputer 10.In the present embodiment, show the example of six branch roads.Other port of single-chip microcomputer 10, for example VCC port, RESET port, RXD and TXD port, XTAL2 and XTAL1 port, VSS end etc. are the same with traditional mode with being connected of other circuit, for give top priority to what is the most important and know for the purpose of, just no longer describe in detail here, can be with reference to conventional art.
When entering into the key scan program, the charactron field of single-chip microcomputer 10 drives port P1.0-P1.7 and is put 1, and every section that makes charactron all is dark, does not show.Even gating chip 10 has gating signal output at this moment, charactron can not lighted yet, so multiplexing port P3.2, P3.4 can only be used in the keyboard scan function at this moment.When as " charactron gating ", because showing, keyboard adopts dynamic scan, be only to have a charactron selected in a certain moment, for example, need No. 2 charactrons to light, then multiplexing port P3.2, P3.3 and the P3.4 with single-chip microcomputer 10 is output as 001, this moment is through the conversion of gating chip 30, its number pipe gating signal output terminal X1 is output as 1, all the other are output as 0, No. 2 charactron is promptly selected, and these No. 2 charactrons show according to the output of the charactron field driving port P1.0-P1.7 of single-chip microcomputer 10.So can multiplexing one group of port realize the function of keyboard scan and charactron gating simultaneously, simplified circuit structure.
Claims (3)
1. a frequency converter keyboard circuit is characterized in that, comprising:
Keyboard microcontroller comprises that one group of charactron field drives port and one group of multiplexing end;
Keyboard scanning circuit links to each other with the multiplexing end of described keyboard microcontroller; With
The gating chip comprises one group of charactron gating input end and one group of charactron gating signal output terminal; This charactron gating input end links to each other with the multiplexing end of described keyboard microcontroller.
2. frequency converter keyboard circuit as claimed in claim 1 is characterized in that, described sweep circuit comprises the button branch road of many parallel connections, and every branch road comprises a diode and button of series connection.
3. frequency converter keyboard circuit as claimed in claim 2 is characterized in that, described sweep circuit comprises 6 button branch roads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006201625970U CN201017282Y (en) | 2006-12-30 | 2006-12-30 | Frequency transformator keyboard circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006201625970U CN201017282Y (en) | 2006-12-30 | 2006-12-30 | Frequency transformator keyboard circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201017282Y true CN201017282Y (en) | 2008-02-06 |
Family
ID=39057779
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2006201625970U Expired - Fee Related CN201017282Y (en) | 2006-12-30 | 2006-12-30 | Frequency transformator keyboard circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201017282Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103036546A (en) * | 2012-12-14 | 2013-04-10 | 深圳和而泰智能控制股份有限公司 | Light-emitting diode (LED) and button multiplex circuit and household appliance |
| CN104113348A (en) * | 2013-04-19 | 2014-10-22 | 江苏沁恒股份有限公司 | Device for button scanning under multi-digit nixie tube driving environment and control method |
-
2006
- 2006-12-30 CN CNU2006201625970U patent/CN201017282Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103036546A (en) * | 2012-12-14 | 2013-04-10 | 深圳和而泰智能控制股份有限公司 | Light-emitting diode (LED) and button multiplex circuit and household appliance |
| CN104113348A (en) * | 2013-04-19 | 2014-10-22 | 江苏沁恒股份有限公司 | Device for button scanning under multi-digit nixie tube driving environment and control method |
| CN104113348B (en) * | 2013-04-19 | 2017-07-18 | 江苏沁恒股份有限公司 | Device and control method for the key scan under multidigit nixie tube drive environment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080206 Termination date: 20111230 |