A delay time detection circuit includes below configurations. A clock generation unit generates a sub scale clock signal, based on a system clock signal. A count unit generates a count signal while sequentially and repeatedly incrementing a count number, based on the sub scale clock signal. A sub scale signal generation unit receives the count signal, and generates sub scale signals, equal in number to the count number, that each have, at a rate of once in the count number, a rectangular wave for a duration being associated with a second period and that are shifted in timing relative to one another according to the second period. A delay time calculation unit receives the input clock signal, and calculates a delay time within a range of the first period of the input clock signal with respect to the system clock signal, based on one of the sub scale signals.

The invention relates to a method for step-by-step time setting of a sympathetic watch (200) by a sympathetic clock (100), forming together a sympathetic assembly, where a predetermined time-setting step and a reference position of the displays (3; 4; 5) of the watch (200) are determined, and where the clock (100) performs the time setting of the watch (200) by positioning a transmission line in a position corresponding to the time setting, and by actuating, in successive steps, each of the value of the predetermined step, a transmission line capable of imparting to a time-setting mechanism internal to the watch (200) any movement necessary to precisely achieve the display of the current time.

A method for permanent time setting of a sympathetic watch (200) by a sympathetic clock (100) forming a sympathetic assembly (1000) with the watch (200) which includes an hour display (4) and a minute display (5), a reference position of which will be defined, and the time-setting is executed only at request by action of a user on a control means (300) included in the clock (100) or the watch (200), or automatically periodically controlled by the clock (100), and, to perform the time setting, the clock (100) drives the displays (4; 5) of the watch backwards, in the counter-clockwise direction, with a sufficiently long stroke to ensure that the displays (4; 5) pass through the reference position; or the clock controls means of the watch (200) which are disposed so as to ensure the displacement of the displays to the reference position by means of heart-pieces.

A delay time detection circuit includes below configurations. A clock generation unit generates a sub scale clock signal, based on a system clock signal. A count unit generates a count signal while sequentially and repeatedly incrementing a count number, based on the sub scale clock signal. A sub scale signal generation unit receives the count signal, and generates sub scale signals, equal in number to the count number, that each have, at a rate of once in the count number, a rectangular wave for a duration being associated with a second period and that are shifted in timing relative to one another according to the second period. A delay time calculation unit receives the input clock signal, and calculates a delay time within a range of the first period of the input clock signal with respect to the system clock signal, based on one of the sub scale signals.

A method for permanent time setting of a sympathetic watch (200) by a sympathetic clock (100) forming a sympathetic assembly (1000) with the watch (200) which includes an hour display (4) and a minute display (5), a reference position of which will be defined, and the time-setting is executed only at request by action of a user on a control means (300) included in the clock (100) or the watch (200), or automatically periodically controlled by the clock (100), and, to perform the time setting, the clock (100) drives the displays (4; 5) of the watch backwards, in the counter-clockwise direction, with a sufficiently long stroke to ensure that the displays (4; 5) pass through the reference position; or the clock controls means of the watch (200) which are disposed so as to ensure the displacement of the displays to the reference position by means of heart-pieces.

The invention relates to a method for step-by-step time setting of a sympathetic watch (200) by a sympathetic clock (100), forming together a sympathetic assembly, where a predetermined time-setting step and a reference position of the displays (3; 4; 5) of the watch (200) are determined, and where the clock (100) performs the time setting of the watch (200) by positioning a transmission line in a position corresponding to the time setting, and by actuating, in successive steps, each of the value of the predetermined step, a transmission line capable of imparting to a time-setting mechanism internal to the watch (200) any movement necessary to precisely achieve the display of the current time.

A method for reference time setting of the displays of a sympathetic watch by a sympathetic clock forming a sympathetic assembly with the watch. At any time, the reference time setting of the watch is performed by a first phase during which the placement in the reference position is triggered, by a first displacement of an interface between the clock and the watch, the reference time setting of the displays, and the coupling mechanism is uncoupled to allow the rack to drive the display gear train of the watch in the counter-clockwise direction, over as many revolutions as necessary, until the pawl meets the ratchet tooth opening of the hour cam, then the time-setting mechanism controlled by the clock sets the time of the displays of the watch in the clockwise direction to the exact time by recoiling the rack, then the coupling mechanism is recoupled.