XR88C681CN View Datasheet(PDF) - Exar Corporation

Part Name

Description

MFG CO.

XR88C681CN

CMOS Dual Channel UART (DUART)

Exar Corporation 

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XR88C681

For Receiving Device

MR1A[7] = 1

For Transmitting Device

MR2B[7] = 1

Start

Assert RTSA

Write 01h to QUART Address 0Eh

(This invokes the “SET OUTPUT

PORT BITS COMMAND” and sets

the Output Port pin, OP0 to a logic

“0”.)

Is

No

FFULLA

Asserted?

Yes

RTSA is Automatically

Negated by Receiver

Controlled RTS Function.

No

Is

FFULLA

Yes

Negated?

Figure 43. A Flow Diagram Depicting an Algorithm That Could be Used to Apply

the Receiver-Controlled RTS/CTS Handshaking Mode

H.1.2 Transmitter-Controlled RTS/CTS Handshaking

In this mode, the Transmitter now has the ability to negate the RTS output (to the Receiving Device). Specifically, this

mode allows the Transmitter to negatye the RTS signal, one bit period after emptying the THR and TSR.

Rev. 2.11

81

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