JPS57196363A - Automatic switching device of single chip microcomputer mode - Google Patents

Automatic switching device of single chip microcomputer mode

Info

Publication number
JPS57196363A
JPS57196363A JP56079190A JP7919081A JPS57196363A JP S57196363 A JPS57196363 A JP S57196363A JP 56079190 A JP56079190 A JP 56079190A JP 7919081 A JP7919081 A JP 7919081A JP S57196363 A JPS57196363 A JP S57196363A
Authority
JP
Japan
Prior art keywords
signal
circuit
outside
address signal
inputted
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
JP56079190A
Other languages
Japanese (ja)
Other versions
JPH0213345B2 (en
Inventor
Isao Nakamura
Toshimasa Kihara
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.)
Hitachi Microcomputer System Ltd
Hitachi Ltd
Original Assignee
Hitachi Ltd
Hitachi Microcomputer Engineering 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 Hitachi Ltd, Hitachi Microcomputer Engineering Ltd filed Critical Hitachi Ltd
Priority to JP56079190A priority Critical patent/JPS57196363A/en
Publication of JPS57196363A publication Critical patent/JPS57196363A/en
Publication of JPH0213345B2 publication Critical patent/JPH0213345B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F15/00—Digital computers in general; Data processing equipment in general
    • G06F15/76—Architectures of general purpose stored program computers
    • G06F15/78—Architectures of general purpose stored program computers comprising a single central processing unit
    • G06F15/7839—Architectures of general purpose stored program computers comprising a single central processing unit with memory
    • G06F15/7864—Architectures of general purpose stored program computers comprising a single central processing unit with memory on more than one IC chip

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Microcomputers (AREA)

Abstract

PURPOSE:To effectively use a computer, by decoding an address signal in its inside, detecting whether this signal is an address signal of an inside memory or an outside memory, and automatically sending out the address signal to the outside only in case of an address of the outside memory. CONSTITUTION:When an address signal is inputted to a decoder 2 and a low potential signal is inputted to AND circuits 8 and 4, an AND condition of the circuit 8 is not formed but an AND condition of the circuit 4 is formed. Accordingly, the circuit 4 sends out the address signal to a memory 9 through an OR circuit 6 and a buffer 7. Also, when a signal of high potential is inputted to the circuits 8 and 4, the AND condition of the circuit is formed, and it is detected that the I/O port can be used. As a result, an I/O port output signal A is outputted to the outside through the circuit 6 and the buffer 7, or from the outside, an I/O port input data signal Ain is inputted through the buffer 8, and the address signal is used as I/O.
JP56079190A 1981-05-27 1981-05-27 Automatic switching device of single chip microcomputer mode Granted JPS57196363A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56079190A JPS57196363A (en) 1981-05-27 1981-05-27 Automatic switching device of single chip microcomputer mode

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56079190A JPS57196363A (en) 1981-05-27 1981-05-27 Automatic switching device of single chip microcomputer mode

Publications (2)

Publication Number Publication Date
JPS57196363A true JPS57196363A (en) 1982-12-02
JPH0213345B2 JPH0213345B2 (en) 1990-04-04

Family

ID=13683051

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56079190A Granted JPS57196363A (en) 1981-05-27 1981-05-27 Automatic switching device of single chip microcomputer mode

Country Status (1)

Country Link
JP (1) JPS57196363A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5268341A (en) * 1975-12-01 1977-06-07 Intel Corp Mos digital computer

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5268341A (en) * 1975-12-01 1977-06-07 Intel Corp Mos digital computer

Also Published As

Publication number Publication date
JPH0213345B2 (en) 1990-04-04

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