XR16C854 Datasheet, PDF (4/51 Pages) Exar Corporation – QUAD UART WITH RX/TX FIFO COUNTERS,128-BYTE FIFO

XR16C854
Figure 3, Block Diagram 68 Mode
D0-D7
R/-W
-RESET
A0-A4
-CS
IRQ
-RXRDY A-D
-TXRDY A-D
XTAL1
MIDI
XTAL2
Transmit
FIFO
Registers
Flow
Control
Logic
Receive
FIFO
Registers
Flow
Control
Logic
Transmit
Shift
Register
TX A-D
Ir
Encoder
Receive
Shift
Register
RX A-D
RXIR A-D
Ir
Decoder
Modem
Control
Logic
-DTR A-D
-RTS A-D
-CTS A-D
-RI A-D
-CD A-D
-DSR A-D
Rev. 1.00P
4