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UART idle line level

You probe a UART TX line while nothing is being sent. What level should you see on a standard 3.3 V logic-level UART?

A.Low, about 0 V, and each frame starts with a high start bitB.A steady square wave at the baud rateC.High, about 3.3 V, and each frame starts with a low start bitD.Half the supply, about 1.65 V

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UART idle line level

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