Abstract: To provide an electronic unit which can prevent brake control from stopping a generator. An electronically controlled mechanical timepiece, which is an electronic unit, includes a generator 2 driven by a coil spring 1 to generate electric power, and a rotation control unit 50 driven by electric energy of the generator to control the rotation period of the generator 2. The rotation control unit 50 is provided with a brake control unit 55 for comparing a reference signal fs with a rotation-detection signal FG1 corresponding to the rotation period of the generator 2 to apply brake control to the generator 2, and a generator-stop preventing unit 56 for setting the amount of brake to be applied to the generator 2 to a first brake setting value to prevent the generator 2 from being stopped, when the rotation period of the generator 2 is equal to or longer than a first setting period which is longer than a reference period.

Abstract: An electronically controlled mechanical timepiece has first and second switches (121, 122) placed between an input terminal (22a) of a capacitor (22) and output terminals MG1 and MG2 of a generator (20), a third switch (130) placed between the output terminal MG1 and an input terminal (22b) of the capacitor (22), and a brake control circuit (55) enabled to control the switches independent of one another. Electric current is fed through the generator 20 by opening the switch (121) and closing the switches (122, 130). Thus, a rate measurement pulse is outputted therefrom. Consequently, rate measurement is easily achieved.

Abstract: An electronically controlled mechanical timepiece includes a mechanical energy source; a generator for converting mechanical energy transmitted through a train wheel to electrical energy. A rotation controller coupled to the generator controls rotation of the generator and includes switch capable of short circuiting the generator by intermittently activating and deactivating the switch using chopper control.

Abstract: A pointer electronic timepiece (1) has a plurality of step motors, a plurality of pointers (11 to 18), and a plurality of external operation members of a winding crown (5) and buttons (6, 7). The pointer to be adjusted is selected from the plurality of pointers (15 to 18) by operating one of the buttons (6) while drawing out the winding crown (5) to a second stage and the other button (7) is operated to adjust the position of the selected pointer. Since the position of the pointers (15 to 18) driven by three step motors can be adjusted by the two buttons (6, 7), the number of the external operation member is not necessary to be increased even when the pointers (15 to 18), i.e. the step motors, are increased, so that the size and thickness of a movement-holder and cost thereof can be reduced and operability during adjustment can be improved.

Abstract: An electronically controlled mechanical timepiece includes a mechanical energy source; a generator for converting mechanical energy transmitted through a train wheel to electrical energy. A rotation controller coupled to the generator controls rotation of the generator and includes switch capable of short circuiting the generator by intermittently activating and deactivating the switch using chopper control.

Abstract: A timepiece includes a mechanical energy source, a generator, and a train wheel connecting the mechanical energy source and the generator. The mechanical energy source drives the train wheel to cause the generator to rotate thereby creating electrical power. A rotation controller coupled to the generator controls the rotation of the generator, and includes a rotation detector for detecting the rotation of the generator and generating a rotation signal corresponding to the rotation and a reference signal generator for generating a reference signal based on a signal from a time reference source. The brake controller counts the reference signal and produces a first count, counts the rotation signal and produces a second count, and brakes the rotation of the generator when the first count is less than the second count.

Abstract: An electronically controlled mechanical timepiece, which is an electronic device, is equipped with a generator 2 for converting the mechanical energy transmitted from a mainspring through the intermediary of a train wheel into electrical energy, and a rotation control unit for controlling the rotation cycle of the generator 2. The rotation control unit is equipped with a count-up/down counter 60 that compares a reference signal with a rotation detection signal of the generator 2 thereby to adjust a braking time for the generator 2, and a brake control signal generating circuit 81 that corrects the time set at the count-up/down counter 60 on the basis of the rotation cycle of the generator 2. If the rotation cycle of the generator 2 significantly deviates from a reference signal cycle, then the braking time is adjusted on the basis of the rotation cycle.

Abstract: A receiver is provided to receive at least a first call number with accompanying message information and a second call number with accompanying common information (e.g. time, weather, stock quotes). The power is supplied to the wireless section of the selective call receiver only for the time period during which information associated with each call number is received. Further, the second call number is common to all receivers and may be received each time the first call number is received. To reduce the consumption of the power supply, the receiver is provided with an execution control signal which may be selectively operated either manually or automatically to control the reception of the second call number. When the second call number is not received or when information is not transmitted in time slots allocated for that purpose, a reduction in the consumption of the power supply is attained.

Abstract: An electronic timekeeping device performs timekeeping functions and on command selectively outputs a plurality of data signals and performs supplemental functions for an external unit such as a microcomputer. Control signals inputted via a data bus from the external unit actuate switch means which selectively permit the external unit to command the timekeeping device to output required data signals or perform a particular function. The basic timekeeping circuits of the device continuously perform the timekeeping function regardless of the data signals or functions which have been commanded for output, and when the external unit is inoperative. Data signals from the external unit can also be input to modify the data output of the timekeeping device. Individual data buses within the timekeeping device are devoted to particular functions.

Abstract: An electronic timepiece calendar circuit whereby the display of at least the date is automatically effected during both leap years and non-leap years is provided. The electronic timepiece calendar circuitry includes a date counter that is indexed by a count of one from a count of one to at least 31 and thereafter is returned to a count of one to begin counting the dates of the next month. A month counter is provided for being indexed by one through a count of one to at least 12 each time the date counter is returned to a count of one and further is adapted to produce a signal representative of the count thereof. A control circuit is provided for receiving the month signal produced by the month counter and in response thereto returns the count of the day counter to one when the count of the month counter is two and the date counter is changed from 28 to 29 or from 30 to 31 depending on whether a leap year signal is applied thereto.