JPS57101927A - Input/output circuit of microcomputer - Google Patents

Input/output circuit of microcomputer

Info

Publication number
JPS57101927A
JPS57101927A JP55178334A JP17833480A JPS57101927A JP S57101927 A JPS57101927 A JP S57101927A JP 55178334 A JP55178334 A JP 55178334A JP 17833480 A JP17833480 A JP 17833480A JP S57101927 A JPS57101927 A JP S57101927A
Authority
JP
Japan
Prior art keywords
input
circuit
gate
signal
case
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
JP55178334A
Other languages
Japanese (ja)
Other versions
JPS5942334B2 (en
Inventor
Osamu Ikeda
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.)
Tokyo Sanyo Electric Co Ltd
Sanyo Electric Co Ltd
Sanyo Denki Co Ltd
Original Assignee
Tokyo Sanyo Electric Co Ltd
Sanyo Electric Co Ltd
Sanyo Denki 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 Tokyo Sanyo Electric Co Ltd, Sanyo Electric Co Ltd, Sanyo Denki Co Ltd filed Critical Tokyo Sanyo Electric Co Ltd
Priority to JP55178334A priority Critical patent/JPS5942334B2/en
Publication of JPS57101927A publication Critical patent/JPS57101927A/en
Publication of JPS5942334B2 publication Critical patent/JPS5942334B2/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/38—Information transfer, e.g. on bus

Abstract

PURPOSE:To raise a function of a microcomputer by a simple circuit configuration, by applying a pulse signal to a set terminal of a storage circuit through an AND gate controlled by a signal for switching a normal input and a latch input. CONSTITUTION:In case when data applied to input/output terminals a0-a3 is a normal input having a sufficiently long pulse period, a signal LIO becomes ''1'', an AND gate 10 is made conducting, and an operation as before is executed. On the other hand, in case when it is a latch input of data having a very short pulse, when data applied to the input terminals a0-a3 becomes ''1'' in a very short period in a state that a storage circuit 8 has been reset, this signal makes the circuit 8 a set state through an AND gate 12. Accordingly, ''1'' is stored in the circuit 8, and from an output Q, ''1'' is applied to an AND gate 11 through a buffer 9. In this case, when an input instruction is executed periodically, ''1'' stored in the circuit 8 stores ''0'' in the circuit 8 through a bus line 7.
JP55178334A 1980-12-16 1980-12-16 Microcomputer input/output circuit Expired JPS5942334B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55178334A JPS5942334B2 (en) 1980-12-16 1980-12-16 Microcomputer input/output circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55178334A JPS5942334B2 (en) 1980-12-16 1980-12-16 Microcomputer input/output circuit

Publications (2)

Publication Number Publication Date
JPS57101927A true JPS57101927A (en) 1982-06-24
JPS5942334B2 JPS5942334B2 (en) 1984-10-15

Family

ID=16046668

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55178334A Expired JPS5942334B2 (en) 1980-12-16 1980-12-16 Microcomputer input/output circuit

Country Status (1)

Country Link
JP (1) JPS5942334B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61104114A (en) * 1984-10-27 1986-05-22 Mazda Motor Corp Cylinder block structure of engine

Also Published As

Publication number Publication date
JPS5942334B2 (en) 1984-10-15

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