US4218876A — Combined timekeeper and calculator with low power…

Claim 1

Independent Claim 93 words

An integrated circuit device having a timekeeping function comprising: a generator stage for generating basic clock signals and system clock signals, said system clock signals being obtainable by modifying said basic clock signals; a processor stage responsive to supply of said system clock signals for executing the operations required for the timekeeping function, said processor stage including a ROM (read only memory)-RAM (random access memory) combination; and clock control means for preventing said processor stage from being supplied with said system clock signals upon completion of the operations required for said timekeeping function.

Claim 2

Dependent Claim 93 words

An integrated circuit device having a timekeeping function comprising: a generator stage for generating basic clock signals and system clock signals, said system clock signals being obtainable by modifying said basic clock signals; a processor stage responsive to supply of said system clock signals for executing the operations required for the timekeeping function, said processor stage including a ROM (read only memory)-RAM (random access memory) combination; and clock control means for preventing said processor stage from being supplied with said system clock signals upon completion of the operations required for said timekeeping function.

Claim 3

Dependent Claim 22 words

The integrated circuit device as set forth in claim 1 wherein said integrated circuit device comprises a large number of MOS-FET elements.

Claim 4

Dependent Claim 25 words

The integrated circuit device as set forth in claim 1 the frequency of said basic clock being about 32 KHz generated by a quartz oscillator.

Claim 5

Dependent Claim 21 words

The integrated circuit device as set forth in claim 1 wherein said system clock signals comprise three distinctly phased clock signals.

Claim 6

Dependent Claim 130 words

An integrated circuit device having at least a timekeeping function comprising: a generator stage for generating basic clock signals and system clock signals, said system clock signals being obtainable by modifying said basic clock signals; means for establishing a one-second signal from said basic clock signals useful for performing the timekeeping function; a processor unit responsive to the supply of said system clock signals for executing the operation required for the timekeeping function; and a clock control for permitting said processor unit to be enabled with said system clock signals in response to the development of said one-second signal and for preventing said system clock signals from being fed to said processor unit when the operation required for the timekeeping function in response to said one-second signal has been completed.

Claim 7

Dependent Claim 130 words

An integrated circuit device having at least a timekeeping function comprising: a generator stage for generating basic clock signals and system clock signals, said system clock signals being obtainable by modifying said basic clock signals; means for establishing a one-second signal from said basic clock signals useful for performing the timekeeping function; a processor unit responsive to the supply of said system clock signals for executing the operation required for the timekeeping function; and a clock control for permitting said processor unit to be enabled with said system clock signals in response to the development of said one-second signal and for preventing said system clock signals from being fed to said processor unit when the operation required for the timekeeping function in response to said one-second signal has been completed.

Claim 8

Dependent Claim 33 words

The integrated circuit device as set forth in claim 5 wherein said operation required for the timekeeping function is executed only for a very short period of time compared to a one-second period.

Claim 9

Dependent Claim 32 words

The integrated circuit device as set forth in claim 5 wherein said operation required for the timekeeping function includes the addition of "one" to seconds information when each second has passed away.

Claim 10

Dependent Claim 29 words

The integrated circuit device as set forth in claim 7 wherein a frequency divider develops said one second signal in response to the output of said basic clock signals.

Claim 11

Dependent Claim 146 words

An integrated circuit device having a timekeeping mode and a calculator mode comprising: an oscillator for generating basic clock signals; a frequency divider responsive to said basic clock signals for generating intermediate clock signals and one-second signals useful in the timekeeper function; a clock generator responsive to said intermediate clock signals from said frequency divider for generating system clock signals; a processor unit responsive to supply of said system clock signals for executing arithmetic operations required for both the timekeeper function and the calculator function; and clock control means connected to said frequency divider for permitting said processor unit to be enabled with said clock signals in response to the development of said one-second signals and for preventing said system clock signals from being fed to said processor unit when the arithmetic operation required for the timekeeper function responsive to said one-second signal has been completed.

Claim 12

Dependent Claim 146 words

An integrated circuit device having a timekeeping mode and a calculator mode comprising: an oscillator for generating basic clock signals; a frequency divider responsive to said basic clock signals for generating intermediate clock signals and one-second signals useful in the timekeeper function; a clock generator responsive to said intermediate clock signals from said frequency divider for generating system clock signals; a processor unit responsive to supply of said system clock signals for executing arithmetic operations required for both the timekeeper function and the calculator function; and clock control means connected to said frequency divider for permitting said processor unit to be enabled with said clock signals in response to the development of said one-second signals and for preventing said system clock signals from being fed to said processor unit when the arithmetic operation required for the timekeeper function responsive to said one-second signal has been completed.

Claim 13

Dependent Claim 56 words

The integrated circuit device as set forth in claim 9 wherein said clock control comprises logical gate means responsive to a control signal which is developed for a period of time from the completion of the timekeeping operations or the calculator operations to the development of the one-second signal or any of the calculator key inputs.

Claim 14

Dependent Claim 35 words

The integrated circuit device as set forth in claim 10 wherein said control signal is derived from a logical gate means responsive to the one-second signal from said frequency divider and the calculator key inputs.

Claim 15

Dependent Claim 46 words

The integrated circuit device as set forth in claim 10 further comprising an external clock input terminal for receipt of external clock signals having a frequency higher than the frequency of said basic clock signal, said higher frequency clock signals being useful in the calculator mode.

Claim 16

Dependent Claim 32 words

The integrated circuit device as set forth in claim 9 wherein said frequency divider comprises a plurality of divider stages, a specific stage of which provides an output useful as stopwatch information.

Claim 17

Dependent Claim 34 words

The integrated circuit device as set forth in claim 9 wherein said frequency divider comprises a plurality of divider stages a specific stage of which provides an output useful for generating an alarm signal.

Claim 18

Independent Claim 157 words

A method of operating an integrated circuit device with a timekeeper function and a calculator function having an oscillator for generating clock signals and a one-second signal, and a processor unit for executing arithmetic operations required for the timekeeper function and the calculator function comprising the steps of: deciding whether said one-second signal has been developed; permitting supply of said clock signals to said processor unit if said one-second signal has been developed; executing addition of "one" to timekeeping information in units of seconds; effecting a required update of timekeeping information in units of seconds, minutes, and hours; renewing the contents of registers associated with readout of said units of updated timekeeping information; preventing said oscillator from supplying said processor unit with said clock signals after renewing of said register; deciding whether any key for the calculator function has been operated; and executing the calculator function in the presence of the operation of any of said keys.

Claim 19

Independent Claim 157 words

A method of operating an integrated circuit device with a timekeeper function and a calculator function having an oscillator for generating clock signals and a one-second signal, and a processor unit for executing arithmetic operations required for the timekeeper function and the calculator function comprising the steps of: deciding whether said one-second signal has been developed; permitting supply of said clock signals to said processor unit if said one-second signal has been developed; executing addition of "one" to timekeeping information in units of seconds; effecting a required update of timekeeping information in units of seconds, minutes, and hours; renewing the contents of registers associated with readout of said units of updated timekeeping information; preventing said oscillator from supplying said processor unit with said clock signals after renewing of said register; deciding whether any key for the calculator function has been operated; and executing the calculator function in the presence of the operation of any of said keys.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1983-08-26	1984-02-25	1984-08-26	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1987-08-26	1988-02-25	1988-08-26	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1991-08-26	1992-02-25	1992-08-26	$7700.00	Window Closed / Lapsed

Combined timekeeper and calculator with low power consumption features

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