JPS648422A - Key matrix circuit - Google Patents
Key matrix circuitInfo
- Publication number
- JPS648422A JPS648422A JP62164257A JP16425787A JPS648422A JP S648422 A JPS648422 A JP S648422A JP 62164257 A JP62164257 A JP 62164257A JP 16425787 A JP16425787 A JP 16425787A JP S648422 A JPS648422 A JP S648422A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- signal
- inputted
- code
- outputs
- 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.)
- Pending
Links
Landscapes
- Input From Keyboards Or The Like (AREA)
Abstract
PURPOSE:To shorten the detecting time of a key code and to prevent scanning potential from being shorted by instantaneously switching the inputs and outputs of the 1st and 2nd I/O circuits by the 1st and 2nd I/O control circuits. CONSTITUTION:At the time of inputting a timing signal from a control circuit 17, the 1st I/O circuit 15 outputs a high potential signal to signal lines 1-4 and transfers the input signal to the 2nd I/O circuit 16 to drive the circuit 16 as an input circuit. The signal lines 3, 7 are shorted by depressing a switch 57 and a high potential signal is transferred to the circuit 16 through the signal line 7. A low potential signal is inputted to the circuit 16 through the other signal lines, code '0010' is inputted to the circuit 16 and then inputted to a data switch 14 included in the circuit 17 to decide the depression of the switch. The 2nd I/O control circuit 13 outputs an output signal to the circuit 16 to output said code '0010'. Since the high potential signal is outputted to the signal line 7 and the low potential signal is outputted to the signal lines 5, 6, 8, the code '0010' is inputted to the control circuit 15 and the depression of the witch connected to the signal line 3 is decided.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62164257A JPS648422A (en) | 1987-06-30 | 1987-06-30 | Key matrix circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62164257A JPS648422A (en) | 1987-06-30 | 1987-06-30 | Key matrix circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS648422A true JPS648422A (en) | 1989-01-12 |
Family
ID=15789656
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62164257A Pending JPS648422A (en) | 1987-06-30 | 1987-06-30 | Key matrix circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS648422A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4997071A (en) * | 1987-05-27 | 1991-03-05 | Valeo | Automatic control system for a clutch coupling two rotating shafts |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5592928A (en) * | 1979-01-08 | 1980-07-14 | Sanyo Electric Co Ltd | Keyboard unit |
-
1987
- 1987-06-30 JP JP62164257A patent/JPS648422A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5592928A (en) * | 1979-01-08 | 1980-07-14 | Sanyo Electric Co Ltd | Keyboard unit |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4997071A (en) * | 1987-05-27 | 1991-03-05 | Valeo | Automatic control system for a clutch coupling two rotating shafts |
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