JPS5690328A - Keyboard control system - Google Patents
Keyboard control systemInfo
- Publication number
- JPS5690328A JPS5690328A JP16775879A JP16775879A JPS5690328A JP S5690328 A JPS5690328 A JP S5690328A JP 16775879 A JP16775879 A JP 16775879A JP 16775879 A JP16775879 A JP 16775879A JP S5690328 A JPS5690328 A JP S5690328A
- Authority
- JP
- Japan
- Prior art keywords
- matrix
- key
- contents
- cpu8
- counters
- 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 make the keyboard for scanning the matrix have the N-key roll-over function, by providing two buffers for detecting a variation of the key code, and processing the contents as an input data in case when the memory contents of said buffers are same.
CONSTITUTION: The key matrix 1 is scanned by the outputs of the counters 4, 5 for counting the clock pulse of the oscillating circuit 6, and when the key switch of the matrix 1 has been depressed, the output of the matrix 1 is detected by the selector 3. Counting of the counters 4, 5 is stopped by said detected output, also a signal as keyboard status is output to the CPU8, and the counting values of the counters 4, 5 are input to the storage device 9. To this storage device 9 is connected the CPU8, and also two buffer registers 10, 11 are installed to the storage device 9. And, plural key codes which have been depressed at the same time by the CPU8 are read by different timing from the registers 10, 11, and in case when the contents are same, the storage contents are processed as an input data.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16775879A JPS5690328A (en) | 1979-12-24 | 1979-12-24 | Keyboard control system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16775879A JPS5690328A (en) | 1979-12-24 | 1979-12-24 | Keyboard control system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5690328A true JPS5690328A (en) | 1981-07-22 |
Family
ID=15855539
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16775879A Pending JPS5690328A (en) | 1979-12-24 | 1979-12-24 | Keyboard control system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5690328A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58168136A (en) * | 1982-03-29 | 1983-10-04 | Fujitsu Ltd | Keyboard controlling circuit |
JPS6132127A (en) * | 1984-07-24 | 1986-02-14 | Alps Electric Co Ltd | Key output system of keyboard |
-
1979
- 1979-12-24 JP JP16775879A patent/JPS5690328A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58168136A (en) * | 1982-03-29 | 1983-10-04 | Fujitsu Ltd | Keyboard controlling circuit |
JPS6132127A (en) * | 1984-07-24 | 1986-02-14 | Alps Electric Co Ltd | Key output system of keyboard |
JPH051485B2 (en) * | 1984-07-24 | 1993-01-08 | Alps Electric Co Ltd |
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