JPS5537649A - Microcomputer - Google Patents

Microcomputer

Info

Publication number
JPS5537649A
JPS5537649A JP11042378A JP11042378A JPS5537649A JP S5537649 A JPS5537649 A JP S5537649A JP 11042378 A JP11042378 A JP 11042378A JP 11042378 A JP11042378 A JP 11042378A JP S5537649 A JPS5537649 A JP S5537649A
Authority
JP
Japan
Prior art keywords
change
terminals
extension
over
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
JP11042378A
Other languages
Japanese (ja)
Other versions
JPS6311706B2 (en
Inventor
Toshiaki Suzuki
Yoshiaki Daimatsu
Takashi Sakao
Kazuaki Mayumi
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 JP11042378A priority Critical patent/JPS5537649A/en
Publication of JPS5537649A publication Critical patent/JPS5537649A/en
Publication of JPS6311706B2 publication Critical patent/JPS6311706B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Microcomputers (AREA)
  • Information Transfer Systems (AREA)

Abstract

PURPOSE: To make efficient use of terminals by providing I/O port signal/extension control signal terminals, a change-over cirucit which selects either signal, and extension change-over terminals.
CONSTITUTION: When a one-chip microcomputer is used only at a master side, extension change-over terminal 29 is held at level "H", multiplexers 23W25 operate as change-over circuits, and I/O port signal/extension control signal terminals 26W28 are selected to input or output I/O port signals. To extend and use I/O by making a connection between master and slave units, terminal 29 is held at level "L". Multiplexers 20W22 operate as change-over circuits to select timing signals, data bus signals and control signals and the master side and slave side are connected together via terminals 26-40,27-41 and 28-42. Data of input-output instructions are inputted to or outputted from ports 61W69 at the slave side through terminal 27-41. Providing extension terminal 29 makes it possible to increase the number of I/O ports.
COPYRIGHT: (C)1980,JPO&Japio
JP11042378A 1978-09-07 1978-09-07 Microcomputer Granted JPS5537649A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11042378A JPS5537649A (en) 1978-09-07 1978-09-07 Microcomputer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11042378A JPS5537649A (en) 1978-09-07 1978-09-07 Microcomputer

Publications (2)

Publication Number Publication Date
JPS5537649A true JPS5537649A (en) 1980-03-15
JPS6311706B2 JPS6311706B2 (en) 1988-03-15

Family

ID=14535374

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11042378A Granted JPS5537649A (en) 1978-09-07 1978-09-07 Microcomputer

Country Status (1)

Country Link
JP (1) JPS5537649A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60225961A (en) * 1984-04-25 1985-11-11 Ascii Corp Interruption controller of cpu
JPS6246361A (en) * 1985-08-23 1987-02-28 Hitachi Ltd Data processor
JPS6471292A (en) * 1987-08-14 1989-03-16 Mitel Corp Dial tone detector

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60225961A (en) * 1984-04-25 1985-11-11 Ascii Corp Interruption controller of cpu
JPS6246361A (en) * 1985-08-23 1987-02-28 Hitachi Ltd Data processor
JPS6471292A (en) * 1987-08-14 1989-03-16 Mitel Corp Dial tone detector

Also Published As

Publication number Publication date
JPS6311706B2 (en) 1988-03-15

Similar Documents

Publication Publication Date Title
JPS57174701A (en) Decentralized controlling system
JPS52146534A (en) Input circuit
JPS5537649A (en) Microcomputer
JPS5593235A (en) Integrated circuit
JPS54146552A (en) Interruption control system
JPS55153188A (en) Memory unit
JPS55105466A (en) Exchange system
EP0070458A3 (en) Single chip microcomputer
JPS57125427A (en) Circuit for transmitting simultaneously command signal
JPS5748153A (en) Picture element density converting system
JPS56157554A (en) Microcomputer device
JPS5572256A (en) Information processor
JPS54159137A (en) Selector
JPS5694430A (en) Data gathering circuit for laboratory automation system
JPS54149438A (en) Sequence control circuit
JPS5525109A (en) Logic circuit
JPS54118750A (en) Control system by multi-system processor
JPS5483337A (en) Circuit scanning system
JPS5467344A (en) Selection system for processor
JPS5523548A (en) Input/output control circuit
JPS5769985A (en) Two dimension digital filter device
JPS553221A (en) Signal transmission/reception system
JPS5450231A (en) Encode circuit for contactless switch
JPS56156049A (en) Connecting system of circuit terminal
JPS5784643A (en) Signal separation circuit