External signal detection circuit and real-time clock

Details External signal detection circuit and real-time clock External signal detection circuit and real-time clock

2006-07-05

2008-08-26

Perveen, Rehana (Department: 2116)

Electrical computers and digital processing systems: support

Clock, pulse, or timing signal generation or analysis

C713S300000, C713S320000, C331S065000, C331S074000, C331S185000

Reexamination Certificate

active

07418614

ABSTRACT:
An external signal detection circuit includes an input port, to which a first end of a circuit including a pull-up resistor connected in series with a first switch portion is connected, the input port receiving an input of an external signal; an input detection portion connected to the input port for receiving an input of the external signal and an input of an input detection signal that sets a timing for intermittently detecting the input of the external signal; and a connection control portion turning on the first switch portion in time with the timing at which the external signal is detected.

REFERENCES:
patent: 6958953 (2005-10-01), Retter et al.
patent: 2005/0268127 (2005-12-01), Shiba et al.
patent: A 7-325780 (1995-12-01), None

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