Real time clock apparatus

Details Real time clock apparatus Real time clock apparatus

2007-07-10

2007-07-10

Chang, Joseph (Department: 2817)

Oscillators

Combined with particular output coupling network

C331S065000

Reexamination Certificate

active

11294755

ABSTRACT:
A given length of an input signal can be detected with small power consumption. A real time clock apparatus has an oscillating module which outputs an original oscillating clock signal having a predetermined frequency, a plurality of dividing modules which divides the original oscillating clock signal outputted from the oscillating module to generate clock signals having a period different from each other, a clock selecting circuit which outputs a clock signal having a given period outputted from the dividing module based on the supplied selection signal, and a signal detecting circuit which is connected to an external switch and which detects a length of an inputted signal by a clock signal outputted from the clock selecting circuit and senses whether the inputted signal is an input signal from the switch.

REFERENCES:
patent: 2003/0061529 (2003-03-01), Iwasa
patent: 05-053703 (1993-03-01), None
patent: 2504190 (1996-04-01), None

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