JPS5510620A - Output change-over circuit - Google Patents

Output change-over circuit

Info

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
Application number
JP8255378A
Other languages
Japanese (ja)
Other versions
JPS616404B2 (en
Inventor
Toshinori Otsuka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP8255378A priority Critical patent/JPS5510620A/en
Publication of JPS5510620A publication Critical patent/JPS5510620A/en
Publication of JPS616404B2 publication Critical patent/JPS616404B2/ja
Granted legal-status Critical Current

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
JP8255378A 1978-07-07 1978-07-07 Output change-over circuit Granted JPS5510620A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (5)

* Cited by examiner, † Cited by third party
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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