INPUT/OUTPUT BUFFER CIRCUIT

摘要

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 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.

主权项

1. An input/output (I/O) buffer circuit comprising:
an I/O unit configured to selectively transmit digital signals and analog signals according to a first enable signal, and selectively receive signals and output signals at an I/O terminal according to a second enable signal; a first register configured to latch a first control signal received before power is turned off, and output the first enable signal corresponding to the first control signal to the I/O unit when power is turned on; and a second register configured to latch a second control signal received before power is turned off, and output the second enable signal corresponding to the second control signal to the I/O unit when power is turned on.