Incrementing signal hold circuit for a clock/calculator
AssigneeHewlett-Packard Company
InventorsEdward A. Heinsen, Vijay V. Marathe
Life of this patent
Estimating the term…
Abstract
A watch/calculator is disclosed which employs a hold circuit to hold clock incrementing pulses when data from the clock is transferred to calculator circuitry or an arithmetic operation is performed on the data. When the time data is returned from the calculator circuitry to the clock circuitry or the arithmetic operation is completed, the hold circuit releases any held incrementing signal so that an increment signal is not lost, even when the time data is momentarily out of the clock circuitry in the calculator circuitry or other operations are being performed on the time data. Thus, when the time data is returned to the clock circuitry or the operation is completed, the data is incremented or updated as it would have been normally.
Claims10
A clock calculator comprising:
- an input device;
- a display;
- a clock means coupled to the display for storing time data, the clock means including incrementing circuit means for producing an increment signal to periodically update the time data;
- calculator circuit means coupled to the input device, the display and the clock means for performing arithmetic operations on time data from the clock means;
- data transfer means connected to the calculator circuit means and the clock means for transferring data between the calculator circuit means and the clock means;
- and
- hold circuit means coupled to the clock means for holding any increment signal that occurs when arithmetic operations are being performed on the time data and for updating the time data in accordance with any held increment signal when the time data is transferred back to the clock means from the calculator circuit means.
A clock calculator comprising:
- an input device;
- a display;
- clock means coupled to the display for storing time data, the clock means including incrementing circuit means for producing an increment signal to periodically update the time data;
- calculator circuit means coupled to the input device, the display and the clock means for performing arithmetic operations on time data;
- and
- hold circuit means coupled to the clock means for holding any increment signal that occurs when arithmetic operations are being performed on the time data and for updating the time data in accordance with any held increment signal when the arithmetic operation is completed.
Dependencies are inferred from the claim text.