1978-04-05
1980-01-22
Weldon, Ulysses
58 50R, 58 23R, 58 395, G04F 704
Patent
active
041843207
ABSTRACT:
An electronic stop watch includes a time counter circuit starting to count reference clock pulses in response to a starting signal and a digital display arrangement having a predetermined number of display sections to display the time counted or measured by the time counter circuit.
A specified count detection circuit is provided to detect that a count of the time counter circuit has reached a specified value which can be displayed by the display sections of the display arrangement. A detection output signal from the detection circuit serves as a display changeover command signal to control count signals which are supplied from the time counter circuit to the display arrangement so that the display arrangement can display time, according to the count of the time counter circuit, in large units of time, for example, in "hours and minutes", instead of small units of time, for example, in "minutes and seconds", after a detection signal has been produced from the detection circuit.
REFERENCES:
patent: 3672155 (1972-06-01), Bergey et al.
patent: 3788058 (1974-01-01), Idei et al.
patent: 3789600 (1974-02-01), Champan
patent: 3795099 (1974-03-01), Tsuruishi
patent: 3854277 (1974-12-01), Samejima et al.
patent: 3940920 (1976-03-01), Nakamura et al.
patent: 3991552 (1976-11-01), Ho et al.
"CT6004-CMOS Digital Watch Circuit" Cal Tex Semiconductor, Inc., P.O. Box 2808, Santa Clara, CA, 95051, Jul. 24, 1974.
Casio Computer Co. Ltd.
Weldon Ulysses
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