An electronic timekeeping system is implemented in bipolar integrated circuit technology for displaying time by way of a digital display. The bipolar circuitry is implemented utilizing integrated injection logic and the countdown chain utilizes flip-flops having geometrics configured to effect power grading. That is, the emitter geometry of the PNP injector is selectively varied so as to vary the injection base drive current.

An electronic timepiece having a multi-digit display of time data and a plurality of frequency divider circuits which generates time data, which comprises operation testing and time correcting means including at least two test terminals, and also a manually operable selecting switch and a manually operable correcting switch. The electronic timepiece also comprises a circuit means which is arranged such that varying combinations of logic level voltages applied to the test terminals can be utilized to test various modes of operation of the frequency divider circuits, a part of such testing being accomplished in conjunction with a signal of relatively high frequency applied to a terminal of one of the manually operable switches.

A digital display type electronic time keeper is disclosed which has a time standard signal generating source having a crystal oscillating circuit. Means are provided for frequency-dividing the time standard signal, for counting the signal fed from the means for frequency-dividing the time standard signal which is driven by at least one power source, and for decoding the counted data. A display device having a positive dielectric anisotropy twisted effect type nematic liquid crystal is driven by the decoded signal. A booster using two phase signals taken from a part of the frequency dividing means provides a power source for driving the counting means, the decoding means and the display device. A level adjuster matches the output of the frequency-dividing means and the input of the counting means and is disposed therebetween. Additional means are provided for correcting the display data of the display device.

An electronic timepiece having function circuitry for performing at least two different functions, each responsive to a manually applied function signal and further circuity for automatically selecting the predetermined function circuit responsive to the function signal is provided. The electronic timepiece includes a timekeeping circuit adapted to produce low frequency timekeeping signals. A first switching circuit is adapted to be selectively actuated to selectively produce the function signal and a second switching circuit is disposed intermediate the first switching circuit and each of the function circuits. The second switching circuit is adapted for manual actuation to selectively apply the selectively produced function signals to one of the function circuits and further includes circuitry for receiving one of the low frequency timekeeping signals produced by the timekeeping circuitry and in response thereto automatically selected a predetermined function circuit for selective application of a function signal within a predetermined period after the second switching circuit effects in response to the manual actuation thereof, a selection of one of the function circuits for receiving the function signal.

A switching arrangement and method for setting or adjusting a time-measuring device comprising at least two counters connected one after the other and connected in certain cases with indicator devices, of which one counter changes the counter position thereof by count-pulses emitted by a generator circuit at successive intervals of time and of which the other counter respectively upon transition of the said one counter from one defined counter position into another defined counter position receives a signal fed from the said one counter, which brings about its onward count, and a control device for resetting the said one counter, characterized in that the counting-range of the said one counter is divided up into two partial ranges of preferably at least approximately equal size, in one of which the said one counter emits a defined first output signal and in the other of which the one counter in question emits a defined second output signal, and that the control device resets the one counter in question out of a counter position lying in the first partial range into a first reset counter position lying in this first partial range for setting the time-measuring device backward and resetting of the said one counter out of a counter position lying in the second partial range into a second reset counter position likewise lying in the first partial range for setting the time measuring device forward.