GB1322869A - Memory circuit - Google Patents
Memory circuitInfo
- Publication number
- GB1322869A GB1322869A GB1322869DA GB1322869A GB 1322869 A GB1322869 A GB 1322869A GB 1322869D A GB1322869D A GB 1322869DA GB 1322869 A GB1322869 A GB 1322869A
- Authority
- GB
- United Kingdom
- Prior art keywords
- windings
- reset
- state
- counter
- stages
- 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
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K21/00—Details of pulse counters or frequency dividers
- H03K21/40—Monitoring; Error detection; Preventing or correcting improper counter operation
- H03K21/403—Arrangements for storing the counting state in case of power supply interruption
Abstract
1322869 Counting apparatus FORD MOTOR CO Ltd 3 Dec 1971 56185/71 Headings G4A and G4D A counting circuit is provided with a memory whereby the original count will be restored after a period in which supply voltage is removed. Each of the four bi-stable stages 12 of each decade of a BCD counter feeding for instance a solid state display device (not shown) has its Q, Q outputs respectively connected to the set and reset windings 14, 15 of a bi-stable magnetic core 13. Whenever one of the stages 12 changes state one of the windings 14, 15 is momentarily energized through a transistor switch 19, 20 to similarly change the state of the respective core. When, after an interruption of the power supply, the bi-stable stages 12 are re-energized they are initially all reset to " 0 " condition the power supply to the switches 19, 20 being withheld during this operation to ensure that the cores remain unchanged. After a delay determined by a circuit 22 a switch 17 restores the supply to switches 19, 20 and also energizes a pulse generator 24. The latter issues a reset pulse to windings 25 on the cores causing all those in a " 1 " state to reset to " 0 " and at the same time to issue a pulse from their read out windings 26. These pulses are delayed by circuits 28 until the reset pulse on windings 25 has disappeared and then applied to the set inputs S of the respective bi-stable stages 12 to set appropriate ones to " 1 " state; those which are set issue a Q output which restores the respective cores to the original states so that the whole counter is restored to its condition prior to the power interruption. The counting circuit may be employed in an odometer for a vehicle. A transducer coupled to the wheels or transmission of the vehicle feeds pulses to the counter representing distance travelled. The counter feeds a digital display device which may comprise an electroluminescent material; similar display devices show other operating conditions of the vehicle such as speed, fuel, oil pressure &c.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5618571 | 1971-12-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1322869A true GB1322869A (en) | 1973-07-11 |
Family
ID=10475957
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1322869D Expired GB1322869A (en) | 1971-12-03 | 1971-12-03 | Memory circuit |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE2255633A1 (en) |
| GB (1) | GB1322869A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4085311A (en) * | 1975-02-27 | 1978-04-18 | Laurel Bank Machine Co., Ltd. | Memory device with error prevention of data during power failure |
| EP0067364A2 (en) * | 1981-06-12 | 1982-12-22 | Siemens Aktiengesellschaft | Method and arrangement for a non-volatile storage of the counting state of an electronic counter |
| EP0067925A2 (en) * | 1981-06-15 | 1982-12-29 | VDO Adolf Schindling AG | Circuit for storing a multidigit decimal value corresponding to the distance covered by a vehicle |
-
1971
- 1971-12-03 GB GB1322869D patent/GB1322869A/en not_active Expired
-
1972
- 1972-11-14 DE DE19722255633 patent/DE2255633A1/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4085311A (en) * | 1975-02-27 | 1978-04-18 | Laurel Bank Machine Co., Ltd. | Memory device with error prevention of data during power failure |
| EP0067364A2 (en) * | 1981-06-12 | 1982-12-22 | Siemens Aktiengesellschaft | Method and arrangement for a non-volatile storage of the counting state of an electronic counter |
| EP0067364A3 (en) * | 1981-06-12 | 1984-01-18 | Siemens Aktiengesellschaft | Method and arrangement for a non-volatile storage of the counting state of an electronic counter |
| EP0195885A2 (en) * | 1981-06-12 | 1986-10-01 | Siemens Aktiengesellschaft | Method and device for the non-volatile memorizing of the counting state of an electronic counter circuit |
| EP0195885A3 (en) * | 1981-06-12 | 1986-11-26 | Siemens Aktiengesellschaft Berlin Und Munchen | Method and device for the non-volatile memorizing of the counting state of an electronic counter circuit |
| EP0067925A2 (en) * | 1981-06-15 | 1982-12-29 | VDO Adolf Schindling AG | Circuit for storing a multidigit decimal value corresponding to the distance covered by a vehicle |
| EP0067925A3 (en) * | 1981-06-15 | 1984-07-04 | Vdo Adolf Schindling Ag | Circuit for storing a multidigit decimal value corresponding to the distance covered by a vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2255633A1 (en) | 1973-06-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| 746 | Register noted 'licences of right' (sect. 46/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |