謾莽
SEPTEMBER 2001
XR16L788
HIGH PERFORMANCE OCTAL UART
REV. 1.1.4
GENERAL DESCRIPTION
The XR16L788
1
(788), formerly XR16L758, is a 5V
and 3.3V with 5V tolerant inputs octal Universal Asyn-
chronous Receiver and Transmitter (UART). The
highly integrated device is designed for high band-
width requirement in communication systems. A new
feature increases device driver efficiency includes a
global interrupt pin with global interrupt source regis-
ters that provide complete and detailed interrupt sta-
tus information for all 8 channels that will speed up in-
terrupt parsing. Other new facilities include simulta-
neous UART registers initialization, individual UART
channel soft-reset, DTR/DSR hardware flow control,
software flow control (Xoff/Xon) detection indicators,
RS-485 half-duplex direction control with programma-
ble turn-around delay, Intel or Motorola bus interface
and sleep mode now has a wake-up indicator.
N
OTE
:
Covered by US patents #5,649,122 and #5,949,787
NEW FEATURES:
鈥?5V and 3.3V
with 5V Tolerant Inputs Operation
鈥?Single Interrupt Output for all 8 UARTs
鈥?Global Interrupt Source for all 8 UARTs
鈥?5G 鈥淔lat鈥?UART Registers for Configurations
鈥?Simultaneous UART Channels Initialization
鈥?Auto RS485 Half-duplex Control with Program-
mable Turn-around Delay
鈥?A General Purpose 16-bit Timer/Counter
鈥?Sleep Mode with Wake-up Indication
鈥?Highly Integrated Device for Space Saving
鈥?/div>
First eight registers are 16C550 compatible
鈥?/div>
64-byte Transmit and Receive FIFOs
鈥?/div>
Transmit and Receive FIFO Level Counters
鈥?/div>
Programmable TX and RX FIFO Trigger Levels
鈥?/div>
Automatic RTS/CTS or DTR/DSR Flow Control
鈥?/div>
Selectable Hardware Flow Control Hysteresis
鈥?/div>
Automatic Xon/Xoff Software Flow Control with Sta-
tus Indicator
鈥?/div>
Infrared (IrDA 1.0) Data Encoder/Decoder
鈥?/div>
Programmable Data Rate with Prescaler
鈥?/div>
Up to 6.25 Mbps Serial Data Rate at 5V
鈥?/div>
100-pin QFP Package (14x20x3 mm)
APPLICATIONS
鈥?/div>
Remote Access Servers
鈥?/div>
Ethernet Network to Serial Ports
鈥?/div>
Network Management
鈥?/div>
Factory Automation and Process Control
鈥?/div>
Point-of-Sale Systems
鈥?/div>
Multi-port RS-232/RS-422/RS-485 Cards
F
IGURE
1. B
LOCK
D
IAGRAM
U A R T C ha n ne l 0
UART
R eg s
64 B yte T X FIF O
TX & RX
IR
ENDEC
RST#
A 7:A 0
D 7 :D 0
IO R #
IO W #
CS#
IN T #
1 6/6 8#
D a ta B u s
Inte rfa ce
D e vice
C o n figu ra tio n
R e g isters
BRG
T X 0 , R X 0 , D T R 0# ,
D S R 0# , R T S 0# ,
C T S 0 # , C D 0 #, R I0 #
64 B yte R X F IF O
U A R T C ha n ne l 1
U A R T C ha n ne l 2
U A R T C ha n ne l 3
U A R T C ha n ne l 4
U A R T C ha n ne l 5
U A R T C ha n ne l 6
1 6-bit
T im e r/C o un ter
U A R T C ha n ne l 7
T X 7 , R X 7 , D T R 7# ,
D S R 7# , R T S 7# ,
C T S 7 # , C D 7 #, R I7 #
X T A L1
X T A L2
TM RCK
C rystal O sc/B u ffer
EXAR
Corporation 48720 Kato Road, Fremont CA, 94538
鈥?/div>
(510) 668-7000
鈥?/div>
FAX (510) 668-7017
鈥?/div>
www.exar.com
鈥?/div>
uarttechsupport@exar.com
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