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XR16C850IJ

UART with 128-byte FIFO’s FIFO Counters and Half-duplex Control

Exar Corporation 

XR16C850

D0-D7

-IOR,IOR

-IOW,IOW

RESET

A0-A2

-AS

CS0,CS1

-CS2

-DDIS

INT

-RXRDY

-TXRDY

XTAL1

RCLK

XTAL2

-BAUDOUT

Transmit

FIFO

Registers

Flow

Control

Logic

Receive

FIFO

Registers

Flow

Control

Logic

Transmit

Shift

TX

Register

Ir

Encoder

Receive

Shift

RX

Register

Ir

Decoder

Modem

Control

Logic

-DTR,-RTS

-OP1/RS485

-OP2

-CTS

-RI

-CD

-DSR

Figure 2. BLOCK DIAGRAM (STANDARD MODE)

Rev. 1.20

3

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