EP1004948A2 - Montre peu chère - Google Patents

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Publication number
EP1004948A2
EP1004948A2 EP99118280A EP99118280A EP1004948A2 EP 1004948 A2 EP1004948 A2 EP 1004948A2 EP 99118280 A EP99118280 A EP 99118280A EP 99118280 A EP99118280 A EP 99118280A EP 1004948 A2 EP1004948 A2 EP 1004948A2
Authority
EP
European Patent Office
Prior art keywords
oscillator
microcontroller
clock
low accuracy
time
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.)
Withdrawn
Application number
EP99118280A
Other languages
German (de)
English (en)
Other versions
EP1004948A3 (fr
Inventor
Pascal Hayet
Alain Sauve
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Mannesmann VDO AG
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mannesmann VDO AG, Siemens AG filed Critical Mannesmann VDO AG
Priority to EP99118280A priority Critical patent/EP1004948A3/fr
Publication of EP1004948A2 publication Critical patent/EP1004948A2/fr
Publication of EP1004948A3 publication Critical patent/EP1004948A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G3/00—Producing timing pulses
    • G04G3/02—Circuits for deriving low frequency timing pulses from pulses of higher frequency
    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G3/00—Producing timing pulses
    • G04G3/02—Circuits for deriving low frequency timing pulses from pulses of higher frequency
    • G04G3/027—Circuits for deriving low frequency timing pulses from pulses of higher frequency by combining pulse-trains of different frequencies, e.g. obtained from two independent oscillators or from a common oscillator by means of different frequency dividing ratios

Definitions

  • the present invention relates to a device with a means for Show the time based on a clock, the rate for the clock is given by an oscillator with low accuracy, which works continuously and provides impulses while the device is equipped with a microcontroller with a very precise clock, but which is switched off when the device is switched off.
  • an oscillation control circuit comprises an astable multivibrator and display means such as Example a light emitting diode connected to the astable multivibrator and is controlled by it.
  • An object of the invention is to provide an inexpensive one Watch, which nevertheless has good precision.
  • the device is provided with means that at least if the device is turned off, are active to the microcontroller periodically to start for a moment, and to tune the frequency of the Low accuracy oscillators using the very accurate clock calibrate while the microcontroller is on and by means to use the result of the calibration to display a corrected Time.
  • the car radio of Figure 1 comprises an antenna 1, a tuner 2, which an intermediate frequency amplifier and demodulator 3 and then one with a loudspeaker 5 connected audio amplifier 4 follows.
  • a microcontroller 9 For administration all functions of the car radio is a microcontroller 9, the is connected by a bus 19 to the above elements.
  • the removable front panel 16 includes a keyboard 10 and a display screen 7.
  • a blinking LED flashes (LED) 17.
  • the pulses used for this flashing LED will be by an inexpensive, based on a known circuit Using low precision RC oscillator 6, for example an integrated circuit of the type HEF4528. This oscillator controls diode 17 directly.
  • An interface 20 leads from this oscillator on the bus 19 a series of pulses with a period from to Example 1 second.
  • This oscillator also becomes a time display function for the car radio derived. This is possible if the main microcontroller 9 the Low-precision oscillator periodically using their own, exact crystal clock 21 calibrated, i.e. the period of the RC oscillator measures in the microcontroller that of the RC oscillator correct time spent.
  • step 11 the oscillator sends a pulse to the microcontroller.
  • step 12 the microcontroller during the for the Blinking of the LED, plus incrementing a first counter, necessary time woken up.
  • step 13 when the first counter reaches a predetermined one Has reached value "n" (J), the microcontroller then calibrates in step 15 the RC oscillator; if it has not done so (N), then the Microcontroller stopped.
  • the microcontroller starts for calibration simply a second internal counter (based on an exact Crystal oscillator) at the impulse arrival event and stops it at the next Pulse event ( Figure 5). After that, the clock value is last through this Calibration for the period from the previous calibration (or as Alternative until next calibration) corrected.
  • the microcontroller creates on the basis of an "incorrect" Beat a "true” beat.
  • the clock is of course only displayed when the radio is switched on. When the radio is turned off the real time is saved every minute every time when the microcontroller is woken up.
  • n 60 (calibration every minute) seems a good compromise to be: It increases the quiescent current of the entire car radio compared to the case without calibration by only 2% during the Error in the clock pulse estimate is then only 1 PPM (in one Environment where the temperature would change 10 times faster the error would only be 10 PPM, i.e. previously negligible).
  • the upper curve of Figure 5 represents two successive pulses of flashing LED, and the lower curve shows the clock pulses of the microcontroller.
  • the microcontroller counts the number of clock pulses between two successive pulses. The absolute mistake in the Measurement of the pulse rate by the microcontroller's oscillator given by the difference between En and En + 1. It's completely random its average being half the microcontroller clock period and when measuring the pulse period on a large number of Samples can be neglected.
  • the microcontroller is with one Register for storing the count between En and En + 1 equipped with the number of pulses received from the oscillator represents.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electric Clocks (AREA)
EP99118280A 1998-09-22 1999-09-15 Montre peu chère Withdrawn EP1004948A3 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP99118280A EP1004948A3 (fr) 1998-09-22 1999-09-15 Montre peu chère

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP98402328 1998-09-22
EP98402328 1998-09-22
EP99118280A EP1004948A3 (fr) 1998-09-22 1999-09-15 Montre peu chère

Publications (2)

Publication Number Publication Date
EP1004948A2 true EP1004948A2 (fr) 2000-05-31
EP1004948A3 EP1004948A3 (fr) 2006-02-15

Family

ID=26151697

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99118280A Withdrawn EP1004948A3 (fr) 1998-09-22 1999-09-15 Montre peu chère

Country Status (1)

Country Link
EP (1) EP1004948A3 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2616398C2 (de) * 1976-04-14 1978-06-01 Siemens Ag, 1000 Berlin Und 8000 Muenchen Schaltungsanordnung zur Regelung der Impulsfolgefrequenz eines Signals
US4305041A (en) * 1979-10-26 1981-12-08 Rockwell International Corporation Time compensated clock oscillator
CH643106B (fr) * 1980-11-26 Suisse Horlogerie Garde-temps comprenant une chaine de diviseurs au rapport de division ajustable.
FI95980C (fi) * 1992-09-04 1996-04-10 Nokia Mobile Phones Ltd Menetelmä ja kytkentäjärjestely ajan mittaamiseksi tarkasti epätarkalla kellolla

Also Published As

Publication number Publication date
EP1004948A3 (fr) 2006-02-15

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