INPUT/OUTPUT BUFFER CIRCUIT FOR AVOIDING MALFUNCTIONING IN PROCESSING SIGNALS
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United States of America Patent
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Aug 1, 2017
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Mar 10, 2015
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Abstract
An input/output (I/O) buffer circuit includes an I/O unit, a first register and a second register. The I/O unit selectively transmits digital signals and analog signals according to a first enable signal, and selectively receives signals and outputs signals at an I/O terminal according to a second enable signal. The first register latches a first control signal received before power is turned off, and outputs the first enable signal corresponding to the first control signal to the I/O unit when power is turned on. The second register latches a second control signal received before power is turned off, and outputs the second enable signal corresponding to the second control signal to the I/O unit when power is turned on.
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