JPS6432354A - Data register device - Google Patents

Data register device

Info

Publication number
JPS6432354A
JPS6432354A JP62189216A JP18921687A JPS6432354A JP S6432354 A JPS6432354 A JP S6432354A JP 62189216 A JP62189216 A JP 62189216A JP 18921687 A JP18921687 A JP 18921687A JP S6432354 A JPS6432354 A JP S6432354A
Authority
JP
Japan
Prior art keywords
cpu
write
runaway
signal
ram
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
JP62189216A
Other languages
Japanese (ja)
Inventor
Hiroki Saito
Shiyouichi Nakamura
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.)
Toshiba Corp
Original Assignee
Toshiba 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 Toshiba Corp filed Critical Toshiba Corp
Priority to JP62189216A priority Critical patent/JPS6432354A/en
Publication of JPS6432354A publication Critical patent/JPS6432354A/en
Pending legal-status Critical Current

Links

Landscapes

  • Storage Device Security (AREA)

Abstract

PURPOSE:To avoid the destruction of the user data even with the runaway of a CPU by giving a write permission signal to a RAM based on a write signal received from the CPU and an external operation signal. CONSTITUTION:A write permission signal is delivered through an AND gate 19 by means of a write signal WR received from a CPU 1 and the Q output of an RSFF 17 of a write control part 15 which responds to an operation means 13. Thus the data are registered into a RAM 5 by writing. In such a way, the registration of data can be externally inhibited to the RAM 5 at the runaway of the CPU 1. Thus the destruction of the user data can be avoided even with the CPU runaway.
JP62189216A 1987-07-29 1987-07-29 Data register device Pending JPS6432354A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62189216A JPS6432354A (en) 1987-07-29 1987-07-29 Data register device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62189216A JPS6432354A (en) 1987-07-29 1987-07-29 Data register device

Publications (1)

Publication Number Publication Date
JPS6432354A true JPS6432354A (en) 1989-02-02

Family

ID=16237502

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62189216A Pending JPS6432354A (en) 1987-07-29 1987-07-29 Data register device

Country Status (1)

Country Link
JP (1) JPS6432354A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0370054A (en) * 1989-08-09 1991-03-26 Canon Inc Electronic equipment
JPH0378053A (en) * 1989-08-22 1991-04-03 Canon Inc Data registration device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0370054A (en) * 1989-08-09 1991-03-26 Canon Inc Electronic equipment
JPH0378053A (en) * 1989-08-22 1991-04-03 Canon Inc Data registration device

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