JPS5692632A - Keyboard control system - Google Patents
Keyboard control systemInfo
- Publication number
- JPS5692632A JPS5692632A JP16976879A JP16976879A JPS5692632A JP S5692632 A JPS5692632 A JP S5692632A JP 16976879 A JP16976879 A JP 16976879A JP 16976879 A JP16976879 A JP 16976879A JP S5692632 A JPS5692632 A JP S5692632A
- Authority
- JP
- Japan
- Prior art keywords
- repeat
- read
- signal
- keyboard
- line
- 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
Abstract
PURPOSE: To reduce the overhead in software formation, by providing the line buffer LB at the keyboard scan-return side and controlling the buffer output every time when the repeat signal is received.
CONSTITUTION: When a repeat key switch is depressed on a keyboard unit 3, an arbitrary repeat cycle signal is made at a repeat control circuit 4 and it is input to LB5. LB5 inhibits the return line 15 when a significant signal is fed to a signal line 18, the output of LB5 is all made "High", and the return line 19 is made to "High". The keyboard control LSI1 does not read in twice, even if depression is continuously made after the data is once read in, but when the return line 19 is once made to H level, the LSI1 makes enable/desirable control so that the key switch is again read in. Thus, in synchronizing with the repeat cycle, the key code on the unit 3 can be read in and the program of data readout routine can be simplified.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16976879A JPS5692632A (en) | 1979-12-26 | 1979-12-26 | Keyboard control system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16976879A JPS5692632A (en) | 1979-12-26 | 1979-12-26 | Keyboard control system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5692632A true JPS5692632A (en) | 1981-07-27 |
Family
ID=15892489
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16976879A Pending JPS5692632A (en) | 1979-12-26 | 1979-12-26 | Keyboard control system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5692632A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62271117A (en) * | 1986-05-20 | 1987-11-25 | Sanyo Electric Co Ltd | Key input device |
-
1979
- 1979-12-26 JP JP16976879A patent/JPS5692632A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62271117A (en) * | 1986-05-20 | 1987-11-25 | Sanyo Electric Co Ltd | Key input device |
JPH0750423B2 (en) * | 1986-05-20 | 1995-05-31 | 三洋電機株式会社 | Key input device |
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