XR16C854 Datasheet, PDF (22/51 Pages) Exar Corporation – QUAD UART WITH RX/TX FIFO COUNTERS,128-BYTE FIFO

XR16C854
D0-D7
-IOR,-IOW
RESET
A0-A2
-CS A-D
Figure 12, INTERNAL LOOP-BACK MODE DIAGRAM
Transmit
FIFO
Registers
Flow
Control
Logic
Receive
FIFO
Registers
Flow
Control
Logic
Transmit
Shift
Register
Ir
Encoder
Receive
Shift
Register
Ir
Decoder
INT A-D
-RXRDY
-TXRDY
XTAL1
XTAL2
Rev. 1.00P
22
TX A-D
RX A-D
-RTS A-D
-CD A-D
-DTR A-D
-RI A-D
-OP1 A-D
-DSR A-D
-OP2 A-D
-CTS A-D