JPS5580134A - Integrated circuit - Google Patents
Integrated circuitInfo
- Publication number
- JPS5580134A JPS5580134A JP15542278A JP15542278A JPS5580134A JP S5580134 A JPS5580134 A JP S5580134A JP 15542278 A JP15542278 A JP 15542278A JP 15542278 A JP15542278 A JP 15542278A JP S5580134 A JPS5580134 A JP S5580134A
- Authority
- JP
- Japan
- Prior art keywords
- cpu5
- reset
- state
- integrated circuit
- power supply
- 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.)
- Granted
Links
Landscapes
- Microcomputers (AREA)
Abstract
PURPOSE: To make a decision on power-ON and reset modes and a reset mode in operation by a program, by providing an integrated circuit for a microcomputer, etc., with a clock generator and power level detecting method of detecting the state of a power supply.
CONSTITUTION: This integrated circuit is provided with power failure detector 1 detecting the state of power supply VCC to a system with CPU5 and clock generator 7 which generates clock pulses needed for the operation of the system. In addition, time FF13 is provided whose state is set by the output pulse of generator 7 and reset by a detection signal from detector 1, and it functions to let CPU5 know a time elapse in normal operation. When a reset request is sent to CPU5, CPU5 is informed of whether clocks are cut off so far by a read instruction of FF13 and a decision on the presence of the cutting-off of clocks is made by the read instruction of FF13 executed first after CPU5 is reset, thereby deciding upon the state of the power supply.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15542278A JPS5580134A (en) | 1978-12-13 | 1978-12-13 | Integrated circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15542278A JPS5580134A (en) | 1978-12-13 | 1978-12-13 | Integrated circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5580134A true JPS5580134A (en) | 1980-06-17 |
| JPS63816B2 JPS63816B2 (en) | 1988-01-08 |
Family
ID=15605647
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15542278A Granted JPS5580134A (en) | 1978-12-13 | 1978-12-13 | Integrated circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5580134A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58169219A (en) * | 1982-03-31 | 1983-10-05 | Nec Home Electronics Ltd | Memory contents holding system of microcomputer |
| JPS59218525A (en) * | 1983-05-27 | 1984-12-08 | Maitetsuku:Kk | Personal computer having reset function |
| EP0458303A2 (en) * | 1990-05-22 | 1991-11-27 | Nec Corporation | Microcomputer with power failure detection |
| JP2007508173A (en) * | 2003-10-11 | 2007-04-05 | プレー・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング | Switching device that detects voltage interruption |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03456A (en) * | 1989-05-29 | 1991-01-07 | Honda Motor Co Ltd | Casting apparatus |
-
1978
- 1978-12-13 JP JP15542278A patent/JPS5580134A/en active Granted
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58169219A (en) * | 1982-03-31 | 1983-10-05 | Nec Home Electronics Ltd | Memory contents holding system of microcomputer |
| JPS59218525A (en) * | 1983-05-27 | 1984-12-08 | Maitetsuku:Kk | Personal computer having reset function |
| EP0458303A2 (en) * | 1990-05-22 | 1991-11-27 | Nec Corporation | Microcomputer with power failure detection |
| EP0458303A3 (en) * | 1990-05-22 | 1994-11-09 | Nec Corp | Microcomputer with power failure detection |
| JP2007508173A (en) * | 2003-10-11 | 2007-04-05 | プレー・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング | Switching device that detects voltage interruption |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63816B2 (en) | 1988-01-08 |
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