JPS5773432A - Malfunction preventing system of microprocessor - Google Patents
Malfunction preventing system of microprocessorInfo
- Publication number
- JPS5773432A JPS5773432A JP55148786A JP14878680A JPS5773432A JP S5773432 A JPS5773432 A JP S5773432A JP 55148786 A JP55148786 A JP 55148786A JP 14878680 A JP14878680 A JP 14878680A JP S5773432 A JPS5773432 A JP S5773432A
- Authority
- JP
- Japan
- Prior art keywords
- microprocessor
- level
- supply voltage
- holding state
- preventing system
- 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
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Quality & Reliability (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Power Sources (AREA)
Abstract
PURPOSE:To prevent the malfunction of an electronic device using a microprocessor, by deteting the level reduction of a supply voltage before the voltage reaches its working threshold and keeping the microprocessor in the holding state. CONSTITUTION:When the level of a power supply voltage -EO begins to lower and then lowered down to the Zener voltage of a Zener diode Z1, the diode Z1 is turned off. Thus no current flows into the photodiode in a photocoupler PH1, and the H signal is supplied to a holding terminal HOLD of a microprocessor CPU. When the CPU judges that the holding state should be kept, then stops its operation by the fact that the level of the terminal HOLD is set at H.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55148786A JPS5773432A (en) | 1980-10-23 | 1980-10-23 | Malfunction preventing system of microprocessor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55148786A JPS5773432A (en) | 1980-10-23 | 1980-10-23 | Malfunction preventing system of microprocessor |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5773432A true JPS5773432A (en) | 1982-05-08 |
Family
ID=15460642
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP55148786A Pending JPS5773432A (en) | 1980-10-23 | 1980-10-23 | Malfunction preventing system of microprocessor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5773432A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59226918A (en) * | 1983-06-07 | 1984-12-20 | Koito Mfg Co Ltd | Control circuit of microcomputer |
JPS615326A (en) * | 1984-06-19 | 1986-01-11 | Matsushita Electric Ind Co Ltd | Service interruption detecting circuit of controller |
-
1980
- 1980-10-23 JP JP55148786A patent/JPS5773432A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59226918A (en) * | 1983-06-07 | 1984-12-20 | Koito Mfg Co Ltd | Control circuit of microcomputer |
JPS615326A (en) * | 1984-06-19 | 1986-01-11 | Matsushita Electric Ind Co Ltd | Service interruption detecting circuit of controller |
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