XR68C681 View Datasheet(PDF) - Exar Corporation

Part Name

Description

MFG CO.

XR68C681

CMOS Dual Channel UART(DUART)

Exar Corporation 

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XR68C681

Remote Loopback Mode

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Note: The CPU has no access to the Serial Data during Remote Loopback Mode.

Figure 22. A Block Diagram Depicting “Remote Loopback Mode” Operation

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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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