Electronic timepiece with controlled date display updating

A method of operating an electronic timepiece comprising:

• supplying power with a power source;
• suspending supply of power from the power source under a predetermined power-saving condition;
• driving hands, which indicate second, minute, and hour, with a hand-driving unit by receiving power from the power source;
• displaying calendar information with a date unit, the displayed calendar information comprising at least one of year, month, and day;
• driving the date unit with a date driving unit by receiving power from the power source;
• updating current calendar information with a date updating unit while the power-saving unit suspends the supply of power, the current calendar information comprising at least one of year, month, and day;
• upon termination of suspension of the supply of power by the power-saving unit, controlling the date driving unit with a control unit to drive the date unit so that the displayed calendar information coincides with the current calendar information, and, responsive to at least one predetermined timepiece condition, setting a speed of driving of the date unit.

An electronic timepiece comprising;

• a power source;
• a power-saving unit that suspends supply of power from the power source under a predetermined power-saving condition;
• a hand-driving unit that drives hands that indicate second, minute and hour by receiving power from the power source;
• a date unit that indicates displayed calendar information comprising at least one of year, month, and day;
• a zero time (0:00) detector that detects a zero time (0:00) position of the hands and outputs a zero time (0:00) detection signal;
• a 24 hours-timekeeping unit that counts time and outputs a 24-hours signal as each 24 hour time period elapses;
• a reset unit that outputs a reset signal after a system resetting;
• a control unit that resets the 24 hours-timekeeping unit following a first zero time (0:00) detection signal following the reset signal;
• a date driving unit that drives the date unit, the control unit controlling the date driving unit to drive the date unit and advance the date in response to a first zero time (0:00) detection signal following the reset signal, and thereafter controlling the date driving unit to drive the date unit and advance the date in response to each 24-hours signal.

An electronic timepiece comprising:

• a power source;
• a power-saving unit that suspends supply of power from the power source under a predetermined power-saving condition;
• a hand-driving unit that drives hands that indicate second, minute and hour by receiving power from the power source;
• a 24 hours-timekeeping unit that counts time and outputs a 24-hours signal as each 24 hours elapses;
• a reset unit that outputs a reset signal and resets the 24 hours-timekeeping unit;
• and
• a precondition of the power-saving unit suspending supply of power from the power source is reception of a 24-hours signal following the reset signal.

A method of operating an electronic timepiece comprising:

• supplying power with a power source;
• suspending supply of power from the power source under a predetermined power-saving condition;
• driving hands, which indicate second, minute, and hour, with a hand-driving unit by receiving power from the power source;
• detecting a zero time (0:00) position of the hands and outputting a zero time (0:00) detection signal;
• counting time with a 24 hours-timekeeping unit and outputting a 24-hours signal as each 24 hour time period elapses;
• outputting a reset signal;
• resetting the 24 hours-timekeeping unit in response to a first zero time (0:00) detection signal following the reset signal;
• driving a date unit to advance a date in response to a first zero time (0:00) detection signal following the reset signal, and thereafter driving the date unit to advance the date in response to each 24-hours signal.

A method of operating an electronic timepiece comprising:

• supplying power with a power source;
• suspending supply of power from the power source under a predetermined power-saving condition;
• driving hands, which indicate second, minute, and hour, with a hand-driving unit by receiving power from the power source;
• counting time with a 24 hours-timekeeping unit and outputting a 24-hours signal as each 24 hour time period elapses;
• outputting a reset signal that resets the 24 hours-timekeeping unit;
• suspending supply of power from the power source only after reception of a 24-hours signal following the reset signal.