JPS55131837A - Key input discriminating circuit - Google Patents
Key input discriminating circuitInfo
- Publication number
- JPS55131837A JPS55131837A JP3996179A JP3996179A JPS55131837A JP S55131837 A JPS55131837 A JP S55131837A JP 3996179 A JP3996179 A JP 3996179A JP 3996179 A JP3996179 A JP 3996179A JP S55131837 A JPS55131837 A JP S55131837A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- key input
- data
- key
- timing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
PURPOSE: To obtain a malfunction preventing circuit of excellent precision by providing a circuit which gives a scanning signal to a key input switch and another circuit which latches the output of the switch, and then by making a comparison between 1st and 2nd data, latched contents, by making use of the timing of the scanning circuit.
CONSTITUTION: Scanning circuit 6 which sends a scanning signal to key selecting circuit 1 and data latch circuit 3 which latches the output of a key input switch from selecting circuit 1 are provided. Then, a key input from selecting circuit 1 is detected by input detecting circuit 2 is applied to the clock input of circuit 3 amd further to sequence circuit 4, the output of which is applied to comparing circuit 5. A synchronizing signal synchronizing with a scanning signal from circuit 1 is applied to circuit 3 and comparing circuit 5 and data of the timing of a 1st key scan is latched by circuit 3 to make a comparison of the operation of the key input switch by comparing circuit 5 extending to the 2nd timing, so that when a coincidence is detected, the data latched by circuit 3 will be used to prevent malfunctions.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3996179A JPS55131837A (en) | 1979-04-03 | 1979-04-03 | Key input discriminating circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3996179A JPS55131837A (en) | 1979-04-03 | 1979-04-03 | Key input discriminating circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55131837A true JPS55131837A (en) | 1980-10-14 |
| JPS6346449B2 JPS6346449B2 (en) | 1988-09-14 |
Family
ID=12567544
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3996179A Granted JPS55131837A (en) | 1979-04-03 | 1979-04-03 | Key input discriminating circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55131837A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5750745U (en) * | 1980-09-10 | 1982-03-23 | ||
| JPS5793356A (en) * | 1980-12-02 | 1982-06-10 | Ricoh Co Ltd | Data read method of device controlled by microcomputer |
| JPS57161921A (en) * | 1981-03-31 | 1982-10-05 | Fuji Electric Co Ltd | Signal processing system |
| JPS60231226A (en) * | 1984-05-02 | 1985-11-16 | Nippon Denki Kanji Syst Kk | Detector of status of switch |
| JPS62138235U (en) * | 1986-02-21 | 1987-08-31 | ||
| JPH0325520A (en) * | 1989-06-23 | 1991-02-04 | Yagi Antenna Co Ltd | Data input system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5251828A (en) * | 1975-10-23 | 1977-04-26 | Omron Tateisi Electronics Co | Key input discriminating unit |
-
1979
- 1979-04-03 JP JP3996179A patent/JPS55131837A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5251828A (en) * | 1975-10-23 | 1977-04-26 | Omron Tateisi Electronics Co | Key input discriminating unit |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5750745U (en) * | 1980-09-10 | 1982-03-23 | ||
| JPS5793356A (en) * | 1980-12-02 | 1982-06-10 | Ricoh Co Ltd | Data read method of device controlled by microcomputer |
| JPS57161921A (en) * | 1981-03-31 | 1982-10-05 | Fuji Electric Co Ltd | Signal processing system |
| JPS60231226A (en) * | 1984-05-02 | 1985-11-16 | Nippon Denki Kanji Syst Kk | Detector of status of switch |
| JPS62138235U (en) * | 1986-02-21 | 1987-08-31 | ||
| JPH0325520A (en) * | 1989-06-23 | 1991-02-04 | Yagi Antenna Co Ltd | Data input system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6346449B2 (en) | 1988-09-14 |
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