JPS55124848A - Malfunction prevention unit for microprocessor - Google Patents

Malfunction prevention unit for microprocessor

Info

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
Application number
JP3112679A
Other languages
Japanese (ja)
Inventor
Teisho Fujiyama
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP3112679A priority Critical patent/JPS55124848A/en
Publication of JPS55124848A publication Critical patent/JPS55124848A/en
Pending legal-status Critical Current

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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
JP3112679A 1979-03-19 1979-03-19 Malfunction prevention unit for microprocessor Pending JPS55124848A (en)

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)

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