JPS5567852A - Malfunction preventing circuit for microcomputer system - Google Patents

Malfunction preventing circuit for microcomputer system

Info

Publication number
JPS5567852A
JPS5567852A JP14144378A JP14144378A JPS5567852A JP S5567852 A JPS5567852 A JP S5567852A JP 14144378 A JP14144378 A JP 14144378A JP 14144378 A JP14144378 A JP 14144378A JP S5567852 A JPS5567852 A JP S5567852A
Authority
JP
Japan
Prior art keywords
stack
processor
data
malfunction
address
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
JP14144378A
Other languages
Japanese (ja)
Inventor
Nobuyuki Takazawa
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP14144378A priority Critical patent/JPS5567852A/en
Publication of JPS5567852A publication Critical patent/JPS5567852A/en
Pending legal-status Critical Current

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Abstract

PURPOSE: To prevent the malfunction for the microcomputer system by giving monitor via the external circuit to the return address register after the branch process, the flag stack and stack pointer each.
CONSTITUTION: In case microprocessor 1 containing the RAM and ROM performs the writing of the data to the stack and the reading of the data from the stack, address latch 7 latches address signals A0WA15 via the signal sent from gate 2 or 3. Comparator 8, to which the highest- and lowest-rank addresses of the memory allotted as the stack, compares the value of these addresses with the latched address and then gives the control to reset or not processor 1 based on the result of the comparison. Processor 1 has the same operation even though the process of processor 1 is carried out through the writing of the external memory. In such constitution, such malfunction as to destroy the contents of the memories excepting the stack can be prevented owing to the data to be stored in the stuck.
COPYRIGHT: (C)1980,JPO&Japio
JP14144378A 1978-11-16 1978-11-16 Malfunction preventing circuit for microcomputer system Pending JPS5567852A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14144378A JPS5567852A (en) 1978-11-16 1978-11-16 Malfunction preventing circuit for microcomputer system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14144378A JPS5567852A (en) 1978-11-16 1978-11-16 Malfunction preventing circuit for microcomputer system

Publications (1)

Publication Number Publication Date
JPS5567852A true JPS5567852A (en) 1980-05-22

Family

ID=15292049

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14144378A Pending JPS5567852A (en) 1978-11-16 1978-11-16 Malfunction preventing circuit for microcomputer system

Country Status (1)

Country Link
JP (1) JPS5567852A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61172345U (en) * 1985-04-17 1986-10-25

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS513822A (en) * 1974-07-01 1976-01-13 Sanyo Electric Co Memorino raitopurotekutosochi
JPS52133739A (en) * 1976-04-30 1977-11-09 Ibm Data processor system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS513822A (en) * 1974-07-01 1976-01-13 Sanyo Electric Co Memorino raitopurotekutosochi
JPS52133739A (en) * 1976-04-30 1977-11-09 Ibm Data processor system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61172345U (en) * 1985-04-17 1986-10-25

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