JPS55124848A - Malfunction prevention unit for microprocessor - Google Patents
Malfunction prevention unit for microprocessorInfo
- Publication number
- JPS55124848A JPS55124848A JP3112679A JP3112679A JPS55124848A JP S55124848 A JPS55124848 A JP S55124848A JP 3112679 A JP3112679 A JP 3112679A JP 3112679 A JP3112679 A JP 3112679A JP S55124848 A JPS55124848 A JP S55124848A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- microprocessor
- diode
- power supply
- zener diode
- 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
- Power Sources (AREA)
Abstract
PURPOSE: To prevent the malfunction of microprocessor, by turning on and off the clock operation in response to the power supply voltage variation.
CONSTITUTION: When rated voltage is fed between the power supply terminals of the microprocessor 1, and when the voltage at the junction point B of the resistance R4 and the Zener diode 9 is taken more than the Zener voltage, breakdown current flows to the Zener diode 9. In this case, the voltage at the junction point A between the resistances R1 and R2 is determined with the value of voltage dividing ratio of the resistances R1 and R2. If this value is set so that no forward current flows to the diode 8, the impedance Z viewed from the oscillator is very high. When the voltage between the power supply terminals is lowered, the Zener diode 9 is non- conductive and the potential at point B is increased, thereby flowing current to the diode 8 and lowering the impedance Z. Thus, the clock oscillator is stopped and the processor 1 interrupts the execution.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3112679A JPS55124848A (en) | 1979-03-19 | 1979-03-19 | Malfunction prevention unit for microprocessor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3112679A JPS55124848A (en) | 1979-03-19 | 1979-03-19 | Malfunction prevention unit for microprocessor |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55124848A true JPS55124848A (en) | 1980-09-26 |
Family
ID=12322722
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3112679A Pending JPS55124848A (en) | 1979-03-19 | 1979-03-19 | Malfunction prevention unit for microprocessor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55124848A (en) |
-
1979
- 1979-03-19 JP JP3112679A patent/JPS55124848A/en active Pending
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