Input circuit shared by multi signal sources

Details Input circuit shared by multi signal sources Input circuit shared by multi signal sources

2006-11-29

2008-11-18

Shin, Christopher B. (Department: 2181)

Electrical computers and digital data processing systems: input/

Input/output data processing

Input/output access regulation

C710S015000, C710S062000, C710S072000, C713S323000

Reexamination Certificate

active

07454534

ABSTRACT:
An input circuit shared by multi signal sources each of which outputting a type of signals includes a processing unit (10). The processing unit includes a plurality of input pins (11) and an interrupt pin (12), each of the input pins connecting with one or more of the signal sources and receiving signals from the signal sources. The input circuit further includes a tristate buffer (30) The tristate buffer includes an enable pin (33) enabling the tristate buffer upon receiving an enable signal, a plurality of input pins (31) connecting with one or more of the signal sources and receiving signals from the signal sources, and a plurality of output pins (32) connecting with the interrupt pin of the processing unit and producing an interrupt signal to the interrupt pin according to the signals received at the input pins. A related wake-up signal input circuit is also provided.

REFERENCES:
patent: 5640571 (1997-06-01), Hedges et al.
patent: 5842028 (1998-11-01), Vajapey
patent: 5883446 (1999-03-01), Yuth
patent: 6009495 (1999-12-01), DeRoo et al.
patent: 6192425 (2001-02-01), Sato
patent: 6256746 (2001-07-01), Cheng
patent: 6272645 (2001-08-01), Wang

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