JPS5510620A - Output change-over circuit - Google Patents
Output change-over circuitInfo
- Publication number
- JPS5510620A JPS5510620A JP8255378A JP8255378A JPS5510620A JP S5510620 A JPS5510620 A JP S5510620A JP 8255378 A JP8255378 A JP 8255378A JP 8255378 A JP8255378 A JP 8255378A JP S5510620 A JPS5510620 A JP S5510620A
- Authority
- JP
- Japan
- Prior art keywords
- output
- register
- input
- output terminal
- terminal
- 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.)
- Granted
Links
Abstract
PURPOSE: To assign an input-output terminal for an input or output terminal without inconvenience, by providing no inefficient instruction for setting the input- output terminal to serve as input or output one.
CONSTITUTION: When input-output terminal 11 used as an output terminal, its output data are temporarily stored in output register 12. Writing to this register 12 is done by storing data on signal line 14 in register 12 when a write signal from control line 13 is supplied to register 12. The output side of register 12 is connected to terminal 11 via switch 13 and terminal 11 is also connected to input line 16. In addition, FF17, provided, is set by a write signal to register 12. Switch 15 is turned ON by its set output. By way of control line 18, FF17 is reset by an initialization signal to the whole unit, for example, independent of the write signal.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8255378A JPS5510620A (en) | 1978-07-07 | 1978-07-07 | Output change-over circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8255378A JPS5510620A (en) | 1978-07-07 | 1978-07-07 | Output change-over circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5510620A true JPS5510620A (en) | 1980-01-25 |
JPS616404B2 JPS616404B2 (en) | 1986-02-26 |
Family
ID=13777680
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8255378A Granted JPS5510620A (en) | 1978-07-07 | 1978-07-07 | Output change-over circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5510620A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60171520A (en) * | 1984-02-16 | 1985-09-05 | Nec Corp | Large-scale integrated circuit |
JPH01155531U (en) * | 1988-04-14 | 1989-10-25 | ||
JPH04101157U (en) * | 1991-01-31 | 1992-09-01 | 富士通テン株式会社 | One-chip microcomputer bidirectional input/output port switching circuit |
JPH0744287A (en) * | 1993-07-30 | 1995-02-14 | Nisca Corp | Picture inputting device |
-
1978
- 1978-07-07 JP JP8255378A patent/JPS5510620A/en active Granted
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60171520A (en) * | 1984-02-16 | 1985-09-05 | Nec Corp | Large-scale integrated circuit |
JPH01155531U (en) * | 1988-04-14 | 1989-10-25 | ||
JPH04101157U (en) * | 1991-01-31 | 1992-09-01 | 富士通テン株式会社 | One-chip microcomputer bidirectional input/output port switching circuit |
JP2568744Y2 (en) * | 1991-01-31 | 1998-04-15 | 富士通テン株式会社 | Switching circuit for bidirectional input / output port of one-chip microcomputer |
JPH0744287A (en) * | 1993-07-30 | 1995-02-14 | Nisca Corp | Picture inputting device |
Also Published As
Publication number | Publication date |
---|---|
JPS616404B2 (en) | 1986-02-26 |
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