XR88C681CP/40 Exar Corporation, XR88C681CP/40 Datasheet - Page 81

• Manufacturer Part Number: XR88C681CP/40
• Description: Dual Channel UART
• Manufacturer: Exar Corporation

Specifications of XR88C681CP/40

• Features: *
• Number Of Channels: 2, DUART
• Fifo's: 1 Byte, 3 Byte
• Voltage - Supply: 5V
• With Parallel Port: Yes
• With Cmos: Yes
• Mounting Type: Through Hole
• Package / Case: 40-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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
Figure 43. A Flow Diagram Depicting an Algorithm That Could be Used to Apply
No
the Receiver-Controlled RTS/CTS Handshaking Mode
Write 01h to QUART Address 0Eh
Assert RTSA
(This invokes the “SET OUTPUT
PORT BITS COMMAND” and sets
the Output Port pin, OP0 to a logic
“0”.)
For Receiving Device
MR1A[7] = 1
For Transmitting Device
MR2B[7] = 1
RTSA is Automatically
Negated by Receiver
Controlled RTS Function.
FFULLA
Asserted?
Start
Is
Yes
81
No
FFULLA
Negated?
Is
Yes
XR88C681