JPS5757354A - Cut-off controller for internal memory - Google Patents

Cut-off controller for internal memory

Info

Publication number
JPS5757354A
JPS5757354A JP55133499A JP13349980A JPS5757354A JP S5757354 A JPS5757354 A JP S5757354A JP 55133499 A JP55133499 A JP 55133499A JP 13349980 A JP13349980 A JP 13349980A JP S5757354 A JPS5757354 A JP S5757354A
Authority
JP
Japan
Prior art keywords
cut
program
memory
power source
instruction word
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.)
Pending
Application number
JP55133499A
Other languages
Japanese (ja)
Inventor
Norimasa Yamaguchi
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.)
Sharp Corp
Original Assignee
Sharp Corp
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 Sharp Corp filed Critical Sharp Corp
Priority to JP55133499A priority Critical patent/JPS5757354A/en
Publication of JPS5757354A publication Critical patent/JPS5757354A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/26—Power supply means, e.g. regulation thereof

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Techniques For Improving Reliability Of Storages (AREA)

Abstract

PURPOSE:To realize automatic cut-off with use of a simple circuit, by controlling a system program of an external storage means to write into a volatile memory based on a program of an internal nonvolatile memory when the power source is applied. CONSTITUTION:An internal nonvolatile memory 1A that performs a bootstrap sets and stores a cut-off instruction word after a program by which a prescribed operation is carried out after a power source is applied. Then a system program is controlled to write into a volatile memory 1B from an external storage device 12 and based on the program of the memory 1A during a period from the application of power source to the detection of the cut-off instruction word. When the reading of the cut-off instruction word is detected, the memory 1A is cut off to be jumped to a desired program of the memory 1B.
JP55133499A 1980-09-24 1980-09-24 Cut-off controller for internal memory Pending JPS5757354A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55133499A JPS5757354A (en) 1980-09-24 1980-09-24 Cut-off controller for internal memory

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55133499A JPS5757354A (en) 1980-09-24 1980-09-24 Cut-off controller for internal memory

Publications (1)

Publication Number Publication Date
JPS5757354A true JPS5757354A (en) 1982-04-06

Family

ID=15106194

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55133499A Pending JPS5757354A (en) 1980-09-24 1980-09-24 Cut-off controller for internal memory

Country Status (1)

Country Link
JP (1) JPS5757354A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59167763A (en) * 1983-03-01 1984-09-21 エスジーエス―トムソン　マイクロエレクトロニクス，インコーポレイテッド Microcomputer
JPS6068441A (en) * 1983-09-22 1985-04-19 Fujitsu Ltd 1-chip microcomputer
JPH01102664A (en) * 1987-10-15 1989-04-20 Fujitsu Ltd Initial program loading system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5426629A (en) * 1977-07-29 1979-02-28 Sharp Corp Microcomputer unit
JPS5474631A (en) * 1977-11-28 1979-06-14 Hitachi Ltd Memory bank control system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5426629A (en) * 1977-07-29 1979-02-28 Sharp Corp Microcomputer unit
JPS5474631A (en) * 1977-11-28 1979-06-14 Hitachi Ltd Memory bank control system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59167763A (en) * 1983-03-01 1984-09-21 エスジーエス―トムソン　マイクロエレクトロニクス，インコーポレイテッド Microcomputer
JPS6068441A (en) * 1983-09-22 1985-04-19 Fujitsu Ltd 1-chip microcomputer
JPH0228179B2 (en) * 1983-09-22 1990-06-21 Fujitsu Ltd
JPH01102664A (en) * 1987-10-15 1989-04-20 Fujitsu Ltd Initial program loading system

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