JPS55110317A - Power reset circuit of micro-computer-applied system - Google Patents
Power reset circuit of micro-computer-applied systemInfo
- Publication number
- JPS55110317A JPS55110317A JP1748879A JP1748879A JPS55110317A JP S55110317 A JPS55110317 A JP S55110317A JP 1748879 A JP1748879 A JP 1748879A JP 1748879 A JP1748879 A JP 1748879A JP S55110317 A JPS55110317 A JP S55110317A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- time
- waveform
- transistor
- power
- 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 it possible to reset power securely all the time by turning OFF the power-supply of an input output circuit of CPU while supplying a reset signal of short and constant time to CPU short time after the operation of a human hand can not correspond with power ON.
CONSTITUTION: At time t0 when the power supply is turned ON, voltage Vcc of waveform (a) is supplied to a power terminal to develope a voltage of waveform (b) at the base of transistor 28. At time t1 when the voltage reaches voltage VBE1 which turns transistor 28 ON t1Wt0 is set too short in time for a human hand to control. The collector voltage of transistor 28 is held at a high level as shown by waveform (c) and the base voltage of transistor 29 has waveform (d). As a result, transistor 29 is cut off during t1Wt2 and a voltage of waveform (e) appears at its collector. Here, t1Wt2 is also set short in time as mentioned above. This voltage is supplied as a reset signal to CPU1 and changed into a voltage of waveform (f) by transistor 30 to turn OFF the power supply of input-output unit 16 or CPU1.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1748879A JPS55110317A (en) | 1979-02-16 | 1979-02-16 | Power reset circuit of micro-computer-applied system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1748879A JPS55110317A (en) | 1979-02-16 | 1979-02-16 | Power reset circuit of micro-computer-applied system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55110317A true JPS55110317A (en) | 1980-08-25 |
Family
ID=11945379
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1748879A Pending JPS55110317A (en) | 1979-02-16 | 1979-02-16 | Power reset circuit of micro-computer-applied system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55110317A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5819539U (en) * | 1981-07-31 | 1983-02-07 | 日本電気ホームエレクトロニクス株式会社 | Starting device for signal processing circuit |
-
1979
- 1979-02-16 JP JP1748879A patent/JPS55110317A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5819539U (en) * | 1981-07-31 | 1983-02-07 | 日本電気ホームエレクトロニクス株式会社 | Starting device for signal processing circuit |
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