GB2187909B - An interface circuit - Google Patents
An interface circuitInfo
- Publication number
- GB2187909B GB2187909B GB8705635A GB8705635A GB2187909B GB 2187909 B GB2187909 B GB 2187909B GB 8705635 A GB8705635 A GB 8705635A GB 8705635 A GB8705635 A GB 8705635A GB 2187909 B GB2187909 B GB 2187909B
- Authority
- GB
- United Kingdom
- Prior art keywords
- microprocessor
- power
- enabled
- reset
- interface circuit
- 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.)
- Expired - Fee Related
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/0703—Error or fault processing not based on redundancy, i.e. by taking additional measures to deal with the error or fault not making use of redundancy in operation, in hardware, or in data representation
- G06F11/0751—Error or fault detection not based on redundancy
- G06F11/0754—Error or fault detection not based on redundancy by exceeding limits
- G06F11/0757—Error or fault detection not based on redundancy by exceeding limits by exceeding a time limit, i.e. time-out, e.g. watchdogs
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/14—Error detection or correction of the data by redundancy in operation
- G06F11/1402—Saving, restoring, recovering or retrying
- G06F11/1415—Saving, restoring, recovering or retrying at system level
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/16—Error detection or correction of the data by redundancy in hardware
- G06F11/20—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/22—Modifications for ensuring a predetermined initial state when the supply voltage has been applied
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Quality & Reliability (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Electronic Switches (AREA)
- Retry When Errors Occur (AREA)
- Debugging And Monitoring (AREA)
- Power Sources (AREA)
Abstract
A power on reset and watchdog circuit for a microprocessor (IC1) inhibits operation of the microprocessor for a predetermined period of time on initial application of power and thereafter enables the microprocessor as long as it receives an appropriate signal (pin 2 of IC1) from the microprocessor indicating normal operation. If this signal fails, the microprocessor is reset. Two circuits can be used with additional logic gates with a pair of microprocessors such that only one is enabled when power is first applied, and if this should fail to operate subsequently the second is enabled and the first inhibited. <IMAGE>
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IE65986 | 1986-03-13 | ||
IE861292A IE861292L (en) | 1986-05-15 | 1986-05-15 | Reset circuit for microprocessor |
IE205186 | 1986-07-31 |
Publications (3)
Publication Number | Publication Date |
---|---|
GB8705635D0 GB8705635D0 (en) | 1987-04-15 |
GB2187909A GB2187909A (en) | 1987-09-16 |
GB2187909B true GB2187909B (en) | 1990-09-12 |
Family
ID=27270317
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8705635A Expired - Fee Related GB2187909B (en) | 1986-03-13 | 1987-03-10 | An interface circuit |
Country Status (2)
Country | Link |
---|---|
GB (1) | GB2187909B (en) |
NL (1) | NL8700584A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2635885B1 (en) * | 1988-08-26 | 1993-01-15 | Beris | METHOD FOR PROTECTING A PROGRAMMED SYSTEM AT THE CENTRAL UNIT AGAINST PARASITES AND DEVICE FOR CARRYING OUT SAID METHOD |
AT398645B (en) * | 1991-11-04 | 1995-01-25 | Alcatel Austria Ag | COMPUTER SYSTEM |
GB2306815A (en) * | 1995-11-04 | 1997-05-07 | Thomson Multimedia Sa | Delay circuit for consumer electronic goods eg TV sets, VCRs |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2006488A (en) * | 1977-10-20 | 1979-05-02 | Euteco Spa | Computer system for controlling the operation of an industrial plant |
US4367422A (en) * | 1980-10-01 | 1983-01-04 | General Electric Company | Power on restart circuit |
GB2105877A (en) * | 1981-09-14 | 1983-03-30 | United Technologies Corp | Watch-dog timer circuit |
US4429236A (en) * | 1980-09-24 | 1984-01-31 | Robert Bosch Gmbh | Apparatus for generating pulses upon decreases in supply voltage |
-
1987
- 1987-03-10 GB GB8705635A patent/GB2187909B/en not_active Expired - Fee Related
- 1987-03-11 NL NL8700584A patent/NL8700584A/en not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2006488A (en) * | 1977-10-20 | 1979-05-02 | Euteco Spa | Computer system for controlling the operation of an industrial plant |
US4429236A (en) * | 1980-09-24 | 1984-01-31 | Robert Bosch Gmbh | Apparatus for generating pulses upon decreases in supply voltage |
US4367422A (en) * | 1980-10-01 | 1983-01-04 | General Electric Company | Power on restart circuit |
GB2105877A (en) * | 1981-09-14 | 1983-03-30 | United Technologies Corp | Watch-dog timer circuit |
Non-Patent Citations (3)
Title |
---|
WO 82/01269 * |
WO 83/00155 * |
WO 86/03312 * |
Also Published As
Publication number | Publication date |
---|---|
NL8700584A (en) | 1987-10-01 |
GB8705635D0 (en) | 1987-04-15 |
GB2187909A (en) | 1987-09-16 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19930310 |