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Which type of device may be used to interface a parallel data format with external equipment’s serial format?

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Which type of device may be used to interface a parallel data format with external equipment’s serial format?

(a) UART

(b) Key matrix

(c) Memory chip

(d) Series in Parallel out

I got this question during an online exam.

Query is from Ring Counter in chapter Registers of Digital Circuits

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The correct option is (a) UART

To explain I would say: UART means Universal Asynchronous Receiver/Transmitter which converts the bytes it receives from the computer along parallel circuits into a single serial bit stream for outbound transmission. And also receives data in serial form and converts it into parallel form and sent to the processor.

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