JPS5674899A - Memory information protecting circuit - Google Patents

Memory information protecting circuit

Info

Publication number
JPS5674899A
JPS5674899A JP15092579A JP15092579A JPS5674899A JP S5674899 A JPS5674899 A JP S5674899A JP 15092579 A JP15092579 A JP 15092579A JP 15092579 A JP15092579 A JP 15092579A JP S5674899 A JPS5674899 A JP S5674899A
Authority
JP
Japan
Prior art keywords
flag
data
cell group
famos
eprom
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
JP15092579A
Other languages
English (en)
Japanese (ja)
Other versions
JPS6128144B2 (enExample
Inventor
Isato Kazama
Hideharu Toyomoto
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP15092579A priority Critical patent/JPS5674899A/ja
Publication of JPS5674899A publication Critical patent/JPS5674899A/ja
Publication of JPS6128144B2 publication Critical patent/JPS6128144B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Storage Device Security (AREA)
  • Read Only Memory (AREA)
JP15092579A 1979-11-20 1979-11-20 Memory information protecting circuit Granted JPS5674899A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15092579A JPS5674899A (en) 1979-11-20 1979-11-20 Memory information protecting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15092579A JPS5674899A (en) 1979-11-20 1979-11-20 Memory information protecting circuit

Publications (2)

Publication Number Publication Date
JPS5674899A true JPS5674899A (en) 1981-06-20
JPS6128144B2 JPS6128144B2 (enExample) 1986-06-28

Family

ID=15507398

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15092579A Granted JPS5674899A (en) 1979-11-20 1979-11-20 Memory information protecting circuit

Country Status (1)

Country Link
JP (1) JPS5674899A (enExample)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5699945U (enExample) * 1979-12-27 1981-08-06
JPS5823398A (ja) * 1981-08-04 1983-02-12 Fujitsu Ltd メモリ内容保護機構付マイクロコンピュ−タ
JPS5894195A (ja) * 1981-11-30 1983-06-04 Nec Home Electronics Ltd ワンチツプ・マイクロコンピユ−タ
JPH0455961A (ja) * 1990-06-25 1992-02-24 Sigma Corp マイクロコンピュータ
JPH0476749A (ja) * 1990-07-19 1992-03-11 Toshiba Corp セキュリティ回路
JPH0520204A (ja) * 1991-07-11 1993-01-29 Matsushita Electric Ind Co Ltd 半導体装置

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5699945U (enExample) * 1979-12-27 1981-08-06
JPS5823398A (ja) * 1981-08-04 1983-02-12 Fujitsu Ltd メモリ内容保護機構付マイクロコンピュ−タ
JPS5894195A (ja) * 1981-11-30 1983-06-04 Nec Home Electronics Ltd ワンチツプ・マイクロコンピユ−タ
JPH0455961A (ja) * 1990-06-25 1992-02-24 Sigma Corp マイクロコンピュータ
JPH0476749A (ja) * 1990-07-19 1992-03-11 Toshiba Corp セキュリティ回路
JPH0520204A (ja) * 1991-07-11 1993-01-29 Matsushita Electric Ind Co Ltd 半導体装置

Also Published As

Publication number Publication date
JPS6128144B2 (enExample) 1986-06-28

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