JPS55959A - Input-output circuit of microcomputer - Google Patents

Input-output circuit of microcomputer

Info

Publication number
JPS55959A
JPS55959A JP7446178A JP7446178A JPS55959A JP S55959 A JPS55959 A JP S55959A JP 7446178 A JP7446178 A JP 7446178A JP 7446178 A JP7446178 A JP 7446178A JP S55959 A JPS55959 A JP S55959A
Authority
JP
Japan
Prior art keywords
input
output
latch
data
strobe
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
JP7446178A
Other languages
Japanese (ja)
Other versions
JPS5750292B2 (en
Inventor
Takashi Sakao
Yoshiaki Daimatsu
Toshiaki Suzuki
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP7446178A priority Critical patent/JPS55959A/en
Publication of JPS55959A publication Critical patent/JPS55959A/en
Publication of JPS5750292B2 publication Critical patent/JPS5750292B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Microcomputers (AREA)

Abstract

PURPOSE: To relieve a load on an external circuit and also to reduce programming by making it possible to use output data latch 4 with a strobe output function as an input data latch.
CONSTITUTION: When outputting is instructed, the output data of microcomputer μCM transmitted via data bus 8 are latched to input-output terminal 11 by latch circuits 9 and 10 by signal (a) from the arithmetic control part. A strobe signal generated by delay circuit 17 and inverter 18 secures that the data have been latched to the output latch completely. For the purpose of the execution of an input instruction, the value of data input-output terminal 11 is stroed in latch circuits 9 and 10 via AND gate 19 by the strobe signal of active LOW applied to strobe input-output terminal 16. Consequently, it can be used for both output and input latches, the need of a latch circuit needed for an external circuit is eliminated to relieve a load on the external circuit, and the programming is also reduced.
COPYRIGHT: (C)1980,JPO&Japio
JP7446178A 1978-06-19 1978-06-19 Input-output circuit of microcomputer Granted JPS55959A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7446178A JPS55959A (en) 1978-06-19 1978-06-19 Input-output circuit of microcomputer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7446178A JPS55959A (en) 1978-06-19 1978-06-19 Input-output circuit of microcomputer

Publications (2)

Publication Number Publication Date
JPS55959A true JPS55959A (en) 1980-01-07
JPS5750292B2 JPS5750292B2 (en) 1982-10-26

Family

ID=13547905

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7446178A Granted JPS55959A (en) 1978-06-19 1978-06-19 Input-output circuit of microcomputer

Country Status (1)

Country Link
JP (1) JPS55959A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62266645A (en) * 1986-05-14 1987-11-19 Nec Corp Serial interface circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54152936A (en) * 1978-05-24 1979-12-01 Hitachi Ltd Output buffer circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54152936A (en) * 1978-05-24 1979-12-01 Hitachi Ltd Output buffer circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62266645A (en) * 1986-05-14 1987-11-19 Nec Corp Serial interface circuit

Also Published As

Publication number Publication date
JPS5750292B2 (en) 1982-10-26

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