JPS54104744A - Signal input circuit to computer - Google Patents
Signal input circuit to computerInfo
- Publication number
- JPS54104744A JPS54104744A JP1172278A JP1172278A JPS54104744A JP S54104744 A JPS54104744 A JP S54104744A JP 1172278 A JP1172278 A JP 1172278A JP 1172278 A JP1172278 A JP 1172278A JP S54104744 A JPS54104744 A JP S54104744A
- Authority
- JP
- Japan
- Prior art keywords
- data
- computer
- sampling
- input signal
- signal
- 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 enable the input of a number of asynchronous serial digital signals, by utilizing the programmable peripheral interface having the latch circuit and the interrupt function to computer and increasing the number of the latch circuits in the permissible range of the processing speed of computer.
CONSTITUTION: The circuit is provided with the programmable peripheral interface 17 latching the input signal from the asynchronous serial digital signal lines 1 to 16, and the latched timing signal is fed from the demultiplier 18 demultiplying the reference signal of the microcomputer 19. Further, the input signal is sampled with the timing of 1/(2n+1) (where: n is an integer more than 1) of the nominal delivery speed, and the sampling and the sampling data immediately before it are compared. If there is a change between the logical value of the both data, the n-th data from the sampling time point is judged as true data, if no change, the data at 2n+1-th data from the sampling time point judging immediately before the true data is judged as the data of continuous input signal.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1172278A JPS54104744A (en) | 1978-02-03 | 1978-02-03 | Signal input circuit to computer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1172278A JPS54104744A (en) | 1978-02-03 | 1978-02-03 | Signal input circuit to computer |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54104744A true JPS54104744A (en) | 1979-08-17 |
Family
ID=11785924
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1172278A Pending JPS54104744A (en) | 1978-02-03 | 1978-02-03 | Signal input circuit to computer |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54104744A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58172742A (en) * | 1982-04-05 | 1983-10-11 | Oki Electric Ind Co Ltd | Reading system for analog-to-digital conversion data |
JPH0495478U (en) * | 1991-01-16 | 1992-08-19 |
-
1978
- 1978-02-03 JP JP1172278A patent/JPS54104744A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58172742A (en) * | 1982-04-05 | 1983-10-11 | Oki Electric Ind Co Ltd | Reading system for analog-to-digital conversion data |
JPS6318212B2 (en) * | 1982-04-05 | 1988-04-18 | Oki Electric Ind Co Ltd | |
JPH0495478U (en) * | 1991-01-16 | 1992-08-19 |
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