XR16L784
HIGH PERFORMANCE 2.97V TO 5.5V QUAD UART
JULY 2008
REV. 1.2.3
GENERAL DESCRIPTION
The XR16L784
1
(784) is a quad Universal
Asynchronous Receiver and Transmitter (UART). The
device is designed for high bandwidth requirement in
communication systems. The global interrupt source
register provides a complete interrupt status
indication for all 4 channels to speed up interrupt
parsing. Each UART has its own 16C550 compatible
set of configuration registers, transmit and receive
FIFOs of 64 bytes, fully programmable transmit and
receive FIFO level triggers, transmit and receive
FIFO level counters, automatic RTS/CTS or DTR/
DSR hardware flow control with programmable
hysteresis, automatic software (Xon/Xoff) flow
control, IrDA (Infrared Data Association) encoder/
decoder, and a 16-bit general purpose timer/counter.
N
OTE
:
1 Covered by U.S. Patents #5,649,122 and #5,949,787
FEATURES
•
2.97V to 5.5V operation with 5V Tolerant Inputs
•
8-bit Intel or Motorola Data Bus Interface
•
Single Open Drain Interrupt output for all 4
channels
•
Global Interrupt Source Registers for all channels
•
5G (Fifth Generation) “Flat” Register Set
•
Each UART is Independently Controlled with:
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APPLICATIONS
•
Remote Access Servers
•
Ethernet Network to Serial Ports
•
Network Management
•
Factory Automation and Process Control
•
Point-of-Sale Systems
•
Multi-port RS-232/RS-422/RS-485 Cards
F
IGURE
1. B
LOCK
D
IAGRAM
16C550 Compatible Registers
64-byte Transmit and Receive FIFOs
Transmit and Receive FIFO Level Counters
Programmable TX and RX FIFO Trigger Levels
Automatic RTS/CTS or DTR/DSR Flow Control
Selectable RTS Flow Control Hysteresis
Automatic Xon/Xoff Software Flow Control
Automatic RS485 Half-duplex Control Output
with 16 Selectable Turn-around Delay
Infrared (IrDA 1.1) Data Encoder/Decoder
Programmable Data Rate with Prescaler
Up to 3.12 (16x) and 6.25 (8x) Mbps Data Rate
•
A General Purpose 16-bit Timer/Counter
•
Sleep Mode with Automatic Wake-up Indicator
•
64-pin LQFP Package (10x10x1.4 mm)
*All Inputs are 5V Tolerant
(Except XTAL1)
UART Channel 0
A7:A0
D7:D0
IOR#
IOW#
CS#
INT#
16/68#
RST#
ENIR
Crystal Osc/
Buffer
16-bit
Timer/Counter
UART Channel 3
Intel or
Motorola
Data
Bus
Interface
Device
Configuration
Register
s
BRG
64 Byte RX FIFO
UART
Regs
64 Byte TX FIFO
TX &
RX
IR
ENDEC
2.97V to 5.5V VCC
GND
TX0, RX0, DTR0#,
DSR0#, RTS0#,
CTS0#, CD0#, RI0#
UART Channel 1
UART Channel 2
TX3, RX3, DTR3#,
DSR3#, RTS3#,
CTS3#, CD3#, RI3#
XTAL1
XTAL2
TMRCK
784BLK
Exar
Corporation 48720 Kato Road, Fremont CA, 94538
•
(510) 668-7000
•
FAX (510) 668-7017
•
www.exar.com
EXAR [ EXAR CORPORATION ]
