XR88C681CP/28 EXAR [Exar Corporation], XR88C681CP/28 Datasheet - Page 82

• Manufacturer Part Number: XR88C681CP/28
• Description: CMOS Dual Channel UART (DUART)
• Manufacturer: EXAR [Exar Corporation]

XR88C681
Transmitting Device
Receiving Device
IP2
RTSA
(OP0)
(RTS-in)
CTSA
OP3
(IP0)
(CTS-out)
TXDA
RXDB
TXRDY_A
(OP7)
To CPU
TXRDY_A
RTSA
CTSA
RXDA
Figure 44. Block Diagram and Timing Sequence of Two DUARTs Connected
in the Transmitter-RTS Controlled Configuration.
Rev. 2.11
82