JPS55116118A - Reset circuit of microcomputer - Google Patents
Reset circuit of microcomputerInfo
- Publication number
- JPS55116118A JPS55116118A JP2435279A JP2435279A JPS55116118A JP S55116118 A JPS55116118 A JP S55116118A JP 2435279 A JP2435279 A JP 2435279A JP 2435279 A JP2435279 A JP 2435279A JP S55116118 A JPS55116118 A JP S55116118A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- reset
- circuit
- microcomputer
- point
- 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
- Electronic Switches (AREA)
Abstract
PURPOSE: To make use of the reset circuit of a microcomputer for a car battery power circuit, etc., efficiently by performing the secure reset operation of the microcomputer even when a power voltage falls abnormally, by providing a voltage decision circuit which forms a short circuit across a capacitor.
CONSTITUTION: Voltage decision circuit 4 is provided. With a car key switch ON, a voltage across regulated power circuit 3 rises from zero (point A) toward regulated power voltage 5V, and Zener voltage V2 of Zener diode 4a turns transistor Tr's 4b and 4f OFF and ON respectively in a low-voltage period (between A and B), so that microcomputer μC7 will stay reset during period A-B. After point B, the power voltage of μC7 increases above T2 and while Tr4b turns ON, 4f turns OFF. Capacitor 5, on the other hand, starts charging with a time constant more than the reset time of μC7 to reset μC7, and consequently the reset is released approximately at point C when the charge of capacitor 5 ends, so that electric load 8 will normally be controlled after point C by a signal from the I/C terminal of μC7.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2435279A JPS55116118A (en) | 1979-03-01 | 1979-03-01 | Reset circuit of microcomputer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2435279A JPS55116118A (en) | 1979-03-01 | 1979-03-01 | Reset circuit of microcomputer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS55116118A true JPS55116118A (en) | 1980-09-06 |
Family
ID=12135792
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2435279A Pending JPS55116118A (en) | 1979-03-01 | 1979-03-01 | Reset circuit of microcomputer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55116118A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5940926U (en) * | 1982-09-08 | 1984-03-16 | 株式会社東芝 | Reset circuit with backup power supply |
| JPS59131071U (en) * | 1983-02-19 | 1984-09-03 | 株式会社日本テクナ−ト | voltage monitoring device |
| JPS59157731A (en) * | 1983-02-25 | 1984-09-07 | Fujitsu General Ltd | Power supply circuit with reset circuit |
| JPS59178730U (en) * | 1983-05-16 | 1984-11-29 | 日本ビクター株式会社 | reset circuit |
| JPS6454151U (en) * | 1987-09-28 | 1989-04-04 | ||
| KR100473216B1 (en) * | 1995-12-22 | 2005-05-20 | 톰슨 콘슈머 일렉트로닉스, 인코포레이티드 | A reset system for ensuring proper reset when used with decaying power supplies |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5094461A (en) * | 1973-12-21 | 1975-07-28 |
-
1979
- 1979-03-01 JP JP2435279A patent/JPS55116118A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5094461A (en) * | 1973-12-21 | 1975-07-28 |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5940926U (en) * | 1982-09-08 | 1984-03-16 | 株式会社東芝 | Reset circuit with backup power supply |
| JPH0237061Y2 (en) * | 1982-09-08 | 1990-10-08 | ||
| JPS59131071U (en) * | 1983-02-19 | 1984-09-03 | 株式会社日本テクナ−ト | voltage monitoring device |
| JPS59157731A (en) * | 1983-02-25 | 1984-09-07 | Fujitsu General Ltd | Power supply circuit with reset circuit |
| JPS59178730U (en) * | 1983-05-16 | 1984-11-29 | 日本ビクター株式会社 | reset circuit |
| JPS6454151U (en) * | 1987-09-28 | 1989-04-04 | ||
| KR100473216B1 (en) * | 1995-12-22 | 2005-05-20 | 톰슨 콘슈머 일렉트로닉스, 인코포레이티드 | A reset system for ensuring proper reset when used with decaying power supplies |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2020384A1 (en) | Battery charger for a portable wireless telephone set having means for tricklingly charging the battery with an increased current during a stand-by period of the telephone set | |
| JPS55111079A (en) | Capacity recovery method in lead acid battery | |
| JPS55116118A (en) | Reset circuit of microcomputer | |
| JPS5764398A (en) | Memory device | |
| JPS5290046A (en) | Voltage monitor circuit | |
| JPS6041795Y2 (en) | power supply | |
| JPS533615A (en) | Voltage controller for ac magneto generator | |
| JPS5258833A (en) | Non-interrupting power supply device | |
| JPS6430430A (en) | Power source circuit | |
| JPS5487265A (en) | Wrist watch with secondary battery | |
| JPS5518731A (en) | Generating circuit for initial reset signal | |
| JPS5479442A (en) | Starting system of static type reactive power regulating device | |
| JPS5753629A (en) | Battery type scale | |
| JPS54134342A (en) | Captive generator control system | |
| TW235385B (en) | Charging control device | |
| JPS54103615A (en) | Demodulating and modulating device | |
| JPS5324865A (en) | Portable electronic timepiece | |
| JPH0161838U (en) | ||
| JPS5688517A (en) | Output controller of microcomputer | |
| JPS54115749A (en) | Source voltage monitor | |
| JPS5720554A (en) | Protective device for starter | |
| JPS55119368A (en) | Method for starting battery charger | |
| JPS5322347A (en) | Analogue memory circuit | |
| JPS54100627A (en) | Status holding circuit | |
| JPS641432A (en) | Power circuit for clock |