XR82C684CJ-F Datasheet, PDF (85/107 Pages) Exar Corporation – CMOS Quad Channel UART(QUART)

Remote Loopback Mode
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Note: The CPU has no access ot the Serial Data during Remote Loopback Mode.
Figure 46. A Block Diagram Depicting Remote Loopback Mode
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MR2n[5] - Transmitter Request-to-Send Control
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MR2n[4] - Clear to Send Control
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MR2n[3:0] - Stop Bit Length
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