JPS5567852A - Malfunction preventing circuit for microcomputer system - Google Patents
Malfunction preventing circuit for microcomputer systemInfo
- 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
Links
Landscapes
- Executing Machine-Instructions (AREA)
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
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61172345U (en) * | 1985-04-17 | 1986-10-25 |
Citations (2)
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 |
-
1978
- 1978-11-16 JP JP14144378A patent/JPS5567852A/en active Pending
Patent Citations (2)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61172345U (en) * | 1985-04-17 | 1986-10-25 |
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