JPS62129653U - - Google Patents

Info

Publication number
JPS62129653U
JPS62129653U JP1757786U JP1757786U JPS62129653U JP S62129653 U JPS62129653 U JP S62129653U JP 1757786 U JP1757786 U JP 1757786U JP 1757786 U JP1757786 U JP 1757786U JP S62129653 U JPS62129653 U JP S62129653U
Authority
JP
Japan
Prior art keywords
input
port
output
microcomputer
diode
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
JP1757786U
Other languages
Japanese (ja)
Other versions
JPH04419Y2 (en
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 filed Critical
Priority to JP1757786U priority Critical patent/JPH04419Y2/ja
Publication of JPS62129653U publication Critical patent/JPS62129653U/ja
Application granted granted Critical
Publication of JPH04419Y2 publication Critical patent/JPH04419Y2/ja
Expired legal-status Critical Current

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  • Microcomputers (AREA)

Description

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本考案の一実施例のブロツク図。第２
図はマイクロコンピユータの内部構成を示すブロ
ツク図。第３図は本考案の一実施例の作用の説明
に供するフローチヤート。第４図は従来例のブロ
ツク図。 ＣＰ……マイクロコンピユータ、Ｒ０〜Ｒ３…
…プルダウン抵抗、Ｄ０およびＤ１……ダイオー
ド、Ｐ０〜Ｐ３……入出力ポート。 FIG. 1 is a block diagram of one embodiment of the present invention. Second
The figure is a block diagram showing the internal configuration of a microcomputer. FIG. 3 is a flowchart for explaining the operation of one embodiment of the present invention. FIG. 4 is a block diagram of a conventional example. CP...Microcomputer, R0 to R3 ...
...Pull-down resistor, D0 and D1 ...diode, P0 to P3 ...input/output port.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 複数ビツト単位の入出力兼用ポートを有するマ
イクロコンピユータにおいて、入出力兼用ポート
にプルアツプ抵抗またはプルダウン抵抗をそれぞ
れ接続し、入出力兼用ポート中入力ポートとして
使用するポートにはダイオードを介して入力デー
タを導くと共に、入出力兼用ポートを出力モード
に設定したときダイオードをオフ状態にするデー
タを入力ポートとして使用するポートに出力する
ことを特徴とするマイクロコンピユータのポート
入出力回路。 In a microcomputer that has input/output ports in units of multiple bits, a pull-up resistor or pull-down resistor is connected to each input/output port, and input data is guided through a diode to the port used as an input port among the input/output ports. A port input/output circuit for a microcomputer is further characterized in that when the input/output port is set to output mode, data that turns off a diode is output to a port used as an input port.
JP1757786U 1986-02-12 1986-02-12 Expired JPH04419Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1757786U JPH04419Y2 (en) 1986-02-12 1986-02-12

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1757786U JPH04419Y2 (en) 1986-02-12 1986-02-12

Publications (2)

Publication Number Publication Date
JPS62129653U true JPS62129653U (en) 1987-08-17
JPH04419Y2 JPH04419Y2 (en) 1992-01-08

Family

ID=30810459

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1757786U Expired JPH04419Y2 (en) 1986-02-12 1986-02-12

Country Status (1)

Country Link
JP (1) JPH04419Y2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6473411A (en) * 1987-09-14 1989-03-17 Nec Corp Bus driving system
JPH0161751U (en) * 1987-10-13 1989-04-19

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6473411A (en) * 1987-09-14 1989-03-17 Nec Corp Bus driving system
JPH0161751U (en) * 1987-10-13 1989-04-19

Also Published As

Publication number Publication date
JPH04419Y2 (en) 1992-01-08

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