Circuit for electronic watches
AssigneeEbauches S.A.
InventorsJean-Luc Beguin, Willy Droz
Life of this patent
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Abstract
A circuit for electronic watches to enable selection between a 12 hour clock display and a 24 hour clock display. The circuit is driven by the hours counter of a watch and includes a control input for selecting the mode of operation and a logic network having outputs for controlling the display of the tens of hours and, for a 12 hour clock system, for controlling an AM or PM display.
Claims3
An electronic timepiece having a digital display, an AM-PM indicator, an hour units counter, and means to enable selection by way of a control input between a 24 hour clock display mode and a 12 hour clock display mode, the improvement wherein said selection means comprises a first and a second flip-flop circuit, a decoder circuit coupled between outputs of said flip-flop circuits and a digital display and AM-PM indicator for driving said display and indicator, and logic means coupled with the counter and said flip-flop circuits and responsive to the control input for interconnecting said flip-flop circuits to form a counter for the tens of hours when said 24 hour clock display mode is selected, and for connecting said first flip-flop circuit to count the tens of hours and said second flip-flop circuit to control the AM-PM indicator when said 12 hour clock display mode is selected.
Dependencies are inferred from the claim text.