JPS54115026A - Signal read-in system to microprocessor - Google Patents
Signal read-in system to microprocessorInfo
- Publication number
- JPS54115026A JPS54115026A JP2387378A JP2387378A JPS54115026A JP S54115026 A JPS54115026 A JP S54115026A JP 2387378 A JP2387378 A JP 2387378A JP 2387378 A JP2387378 A JP 2387378A JP S54115026 A JPS54115026 A JP S54115026A
- Authority
- JP
- Japan
- Prior art keywords
- led
- fet
- input terminal
- mpu
- microprocessor
- 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
- Control By Computers (AREA)
Abstract
PURPOSE: To enable to effective read-in only with one input terminal, by connecting a plurality of FET's in parallel with one input terminal provided with a microprocessor, and by connecting the FET to a plurality of LED's via resistors through correspondence.
CONSTITUTION: One input terminal is provided for the microprocesser MPU controlling input and output signal, and this is connected to the source or drsin of FET elements SW1 to SWn with a plurality sets in parallel connection operated as analog switches. Further, a plurality of output terminals a1 to an of the processor MPU are connected to the drain or source of the elements SW1 to SWn, and the gate of SW1 to SWn is connected to the output terminals O1 to On of the information unit consisting of the series circuit of resistor R1 and LED1,R2 and LED2,Rn and LEDn. With this constitution, a voltage of around logic level is fed to the processor MPU, and the current to LED1 to LEDn is adjusted with resistors R1 to Rn, and the signal from the external unit is read in the processor MPU.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2387378A JPS54115026A (en) | 1978-02-28 | 1978-02-28 | Signal read-in system to microprocessor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2387378A JPS54115026A (en) | 1978-02-28 | 1978-02-28 | Signal read-in system to microprocessor |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54115026A true JPS54115026A (en) | 1979-09-07 |
Family
ID=12122557
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2387378A Pending JPS54115026A (en) | 1978-02-28 | 1978-02-28 | Signal read-in system to microprocessor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54115026A (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS524748A (en) * | 1975-06-27 | 1977-01-14 | Western Electric Co | Selffcheck reading and writing circuit |
-
1978
- 1978-02-28 JP JP2387378A patent/JPS54115026A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS524748A (en) * | 1975-06-27 | 1977-01-14 | Western Electric Co | Selffcheck reading and writing circuit |
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