JPS6476140A - Microcomputer system - Google Patents

Microcomputer system

Info

Publication number
JPS6476140A
JPS6476140A JP62232791A JP23279187A JPS6476140A JP S6476140 A JPS6476140 A JP S6476140A JP 62232791 A JP62232791 A JP 62232791A JP 23279187 A JP23279187 A JP 23279187A JP S6476140 A JPS6476140 A JP S6476140A
Authority
JP
Japan
Prior art keywords
port
input
circuit
output
external circuit
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
JP62232791A
Other languages
Japanese (ja)
Other versions
JPH0562784B2 (en
Inventor
Koichi Sugino
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.)
Seikosha KK
Original Assignee
Seikosha KK
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 Seikosha KK filed Critical Seikosha KK
Priority to JP62232791A priority Critical patent/JPS6476140A/en
Publication of JPS6476140A publication Critical patent/JPS6476140A/en
Publication of JPH0562784B2 publication Critical patent/JPH0562784B2/ja
Granted legal-status Critical Current

Links

Abstract

PURPOSE:To use as an output port to an external circuit except the time of receiving a signal from an input circuit by using an input port and an output port in common and connecting the resistance between the port and the input circuit. CONSTITUTION:To an input/output using port P0, an input circuit 2 and an external circuit 3 such as a watch dog timer are connected through a resistance R1. First, by the power source input, the port P0 is set for the input. This is executed by setting the prescribed bit of the register of a digital processing circuit 1 to '1.' The condition of a switch S is read, and after the reading is completed, the port P0 is switched for an output. This is executed by setting the prescribed bit of the above-mentioned register to '0.' Thereafter, the port P0 is used as an output port to the external circuit 3 and during the constant period, a clock pulse is supplied to the external circuit 3.
JP62232791A 1987-09-17 1987-09-17 Microcomputer system Granted JPS6476140A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62232791A JPS6476140A (en) 1987-09-17 1987-09-17 Microcomputer system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62232791A JPS6476140A (en) 1987-09-17 1987-09-17 Microcomputer system

Publications (2)

Publication Number Publication Date
JPS6476140A true JPS6476140A (en) 1989-03-22
JPH0562784B2 JPH0562784B2 (en) 1993-09-09

Family

ID=16944809

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62232791A Granted JPS6476140A (en) 1987-09-17 1987-09-17 Microcomputer system

Country Status (1)

Country Link
JP (1) JPS6476140A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0355941A (en) * 1989-07-25 1991-03-11 Nec Corp Key telephone set
JPH0370664U (en) * 1989-11-08 1991-07-16
US5184595A (en) * 1991-02-26 1993-02-09 Mitsubishi Denki Kabushiki Kaisha Disorder diagnosis device for fuel injection apparatus
JP2009116832A (en) * 2007-11-09 2009-05-28 Yamaha Motor Electronics Co Ltd Printed circuit board

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60237561A (en) * 1984-05-09 1985-11-26 Ascii Corp Indication system for system constitution of multifunctional cpu

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60237561A (en) * 1984-05-09 1985-11-26 Ascii Corp Indication system for system constitution of multifunctional cpu

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0355941A (en) * 1989-07-25 1991-03-11 Nec Corp Key telephone set
JPH0370664U (en) * 1989-11-08 1991-07-16
US5184595A (en) * 1991-02-26 1993-02-09 Mitsubishi Denki Kabushiki Kaisha Disorder diagnosis device for fuel injection apparatus
JP2009116832A (en) * 2007-11-09 2009-05-28 Yamaha Motor Electronics Co Ltd Printed circuit board

Also Published As

Publication number Publication date
JPH0562784B2 (en) 1993-09-09

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees