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EXAR Corporation 48720 Kato Road, Fremont CA, 94538 · (510) 668-7000 · FAX (510) 668-7017 · www.exar.com · uarttechsupport@exar.com

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XR16L788

HIGH PERFORMANCE OCTAL UART

SEPTEMBER 2001

REV. 1.1.4

GENERAL DESCRIPTION

The XR16L788

(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.

OTE

Covered by US patents #5,649,122 and #5,949,787

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

NEW FEATURES:

· 5V and 3.3V with 5V Tolerant Inputs Operation

· Single Interrupt Output for all 8 UARTs

· Global Interrupt Source for all 8 UARTs

· 5G "Flat" UART Registers for Configurations

· Simultaneous UART Channels Initialization

· Auto RS485 Half-duplex Control with Program-

mable Turn-around Delay

· A General Purpose 16-bit Timer/Counter

· Sleep Mode with Wake-up Indication

· Highly Integrated Device for Space Saving

· First eight registers are 16C550 compatible

· 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 Hardware Flow Control Hysteresis

· Automatic Xon/Xoff Software Flow Control with Sta-

tus Indicator

· Infrared (IrDA 1.0) Data Encoder/Decoder

· Programmable Data Rate with Prescaler

· Up to 6.25 Mbps Serial Data Rate at 5V

· 100-pin QFP Package (14x20x3 mm)

IGURE

1. B

LOCK

IAGRAM

T M R C K

D e vice

C o n figu ra tio n

R e g isters

X T A L1
X T A L2

C rystal O sc/B u ffer

U A R T C ha n ne l 0

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 #

D a ta B u s

Inte rfa ce

R S T #

A 7:A 0

IO R #

IO W #

C S #

IN T #

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 #

U A R T C ha n ne l 7

U A R T C ha n ne l 6

U A R T C ha n ne l 5

U A R T C ha n ne l 4

U A R T C ha n ne l 3

U A R T C ha n ne l 2

U A R T C ha n ne l 1

1 6-bit

T im e r/C o un ter

64 B yte T X FIF O

64 B yte R X F IF O

B R G

E N D E C

T X & R X

U A R T

R eg s

D 7 :D 0

1 6/6 8#

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XR16L788 OCTAL UART

REV. 1.1.4

IGURE

2. P

THE

EVICE

ST#

16/

68#

GND

RCK

I
R

GND

4 5 6 7

1 0 1 1

1 3

1 2

1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 2 3 2 4 2 5 2 6 2 7 2 8 2 9 3 0

7 1 7 0

6 8

6 9

6 7 6 6 6 5 6 4 6 3 6 2 6 1 6 0 5 9 5 8 5 7 5 6 5 5 5 4 5 3 5 2 5 1

X R 1 6 L 7 8 8

1 0 0 -Q F P

R X 7

TX4

TS4#

CD4

TS4#

TX5

TS5#

CD5

7 2

7 3

7 4

7 5

7 6

7 7

7 8

8 0 7 9

C T S 7 #

D S R 7 #

C D 7 #

R I7#

R T S 7 #

D T R 7 #

T X 7

R X 6

C T S 6 #

D S R 6 #

C D 6 #

R I6#

R T S 6 #

D T R 6 #

T X 6

G N D

V C C

R X 5

C T S 5 #

TX3

TS3#

CD3

TS3#

TX2

TS2#

CD2

TS2#

R X 0

C T S 0 #

D S R 0 #

C D 0 #

R I0#

R T S 0 #

D T R 0 #

T X 0

R X 1

C T S 1 #

D S R 1 #

C D 1 #

R I1#

R T S 1 #

D T R 1 #

T X 1

V C C

G N D

X T A L 1

X T A L 2

ORDERING INFORMATION

ART

UMBER

ACKAGE

PERATING

EMPERATURE

ANGE

XR16L788CQ

14x20x3mm 100-QFP

0°C to +70°C

XR16L788IQ

14x20x3mm 100-QFP

-40°C to +85°C

XR16L788 OCTAL UART

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REV. 1.1.4

PIN DESCRIPTIONS

AME

YPE

ESCRIPTION

DATA BUS INTERFACE

A7-A0

20-27

Address data lines [7:0]. A0:A3 selects individual UART's 16 configuration reg-
isters, A4:A6 selects UART channel 0 to7, and A7 selects the global device
configuration registers.

D7:D0

5-12

Data bus lines (7:0] (bidirectional).

IOR#

When 16/68# pin is at logic 1, it selects Intel bus interface and this input is
read strobe (active low). The falling edge instigates an internal read cycle and
retrieves the data byte from an internal register pointed by the address lines
[A7:A0], places it on the data bus to allow the host processor to read it on the
leading edge.
When 16/68# pin is at logic 0, it selects Motorola bus interface and this input
should be connected to VCC.

IOW#

When 16/68# pin is at logic 1, it selects Intel bus interface and this input
becomes write strobe (active low). The falling edge instigates the internal
write cycle and the leading edge transfers the data byte on the data bus to an
internal register pointed by the address lines.
When 16/68# pin is at logic 0, it selects Motorola bus interface and this input
becomes read (logic 1) and write (logic 0) signal (R/W#).

CS#

When 16/68# pin is at logic 1, this input is chip select (active low) to enable
the XR16L788 device.
When 16/68# pin is at logic 0, this input becomes the read and write strobe
(active low) for the Motorola bus interface.

INT#

Global interrupt output from XR16L788 (open drain, active low). This output
requires an external pull-up resistor (47K-100K ohms) to operate properly. It
may be shared with other devices in the system to form a single interrupt line
to the host processor and have the software driver polls each device for the
interrupt status.

MODEM OR SERIAL I/O INTERFACE

TX0

UART channel 0 Transmit Data or infrared transmit data.

RX0

100

UART channel 0 Receive Data or infrared receive data. Normal RXD input
idles at logic 1 condition. The infrared pulses can be inverted internally prior
the decoder by FCTR[4].

RTS0#

UART channel 0 Request to Send or general purpose output (active low).
This port may be used for one of two functions:
1) auto hardware flow control, see EFR bit-6, MCR bits-1 & 2, FCTR bits 0-3

and IER bit-6

2) RS485 half-duplex direction control, see FCTR bit-5, MCR bit-2 and MSR

bits 4-7.

CTS0#

UART channel 0 Clear to Send or general purpose input (active low). It can be
used for auto hardware flow control, see EFR bit-7, MCR bit-2 and IER bit-7.

DTR0#

UART channel 0 Data Terminal Ready or general purpose output (active low).
This port may be used one of two functions.
1) auto hardware flow control, see EFR bit-6, FCTR bits-0 to 3, MCR bits-0 &

2, and IER bit-6

2) RS485 half-duplex direction control, see FCTR bit-5, MCR bit-2 and MSR

bit 4-7.

DSR0#

UART channel 0 Data Set Ready or general purpose input (active low). It can
be used for auto hardware flow control, see EFR bit-7, MCR bit-2 and IER bit-
7.

CD0#

UART channel 0 Carrier Detect or general purpose input (active low).

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XR16L788 OCTAL UART

REV. 1.1.4

RI0#

UART channel 0 Ring Indicator or general purpose input (active low).

TX1

UART channel 1 Transmit Data or infrared transmit data.

RX1

UART channel 1 Receive Data or infrared receive data. Normal RXD input
idles at logic 1 condition. The infrared pulses can be inverted internally prior
the decoder by FCTR[4].

RTS1#

UART channel 1 Request to Send or general purpose output (active low). See
description of RTS0# pin.

CTS1#

UART channel 1 Clear to Send or general purpose input (active low). See
description of CTS0# pin.

DTR1#

UART channel 1 Data Terminal Ready or general purpose output (active low).
See description of DTR0# pin.

DSR1#

UART channel 1 Data Set Ready or general purpose input (active low). See
description of DSR0# pin.

CD1#

UART channel 1 Carrier Detect or general purpose input (active low).

RI1#

UART channel 1 Ring Indicator or general purpose input (active low).

TX2

UART channel 2 Transmit Data or infrared transmit data.

RX2

UART channel 2 Receive Data or infrared receive data. Normal RXD input
idles at logic 1 condition. The infrared pulses can be inverted internally prior
the decoder by FCTR[4].

RTS2#

UART channel 2 Request to Send or general purpose output (active low). See
description of RTS0# pin.

CTS2#

UART channel 2 Clear to Send or general purpose input (active low). See
description of CTS0# pin.

DTR2#

UART channel 2 Data Terminal Ready or general purpose output (active low).
See description of DTR0# pin.

DSR2#

UART channel 2 Data Set Ready or general purpose input (active low). See
description of DSR0# pin.

CD2#

UART channel 2 Carrier Detect or general purpose input (active low).

RI2#

UART channel 2 Ring Indicator or general purpose input (active low).

TX3

UART channel 3 Transmit Data or infrared transmit data.

RX3

UART channel 3 Receive Data or infrared receive data. Normal RXD input
idles at logic 1 condition. The infrared pulses can be inverted internally prior
the decoder by FCTR[4].

RTS3#

UART channel 3 Request to Send or general purpose output (active low). See
description of RTS0# pin.

CTS3#

UART channel 3 Clear to Send or general purpose input (active low). See
description of CTS0# pin.

DTR3#

UART channel 3 Data Terminal Ready or general purpose output (active low).
See description of DTR0# pin.

DSR3#

UART channel 3 Data Set Ready or general purpose input (active low). See
description of DSR0# pin.

CD3#

UART channel 3 Carrier Detect or general purpose input (active low).

RI3#

UART channel 3 Ring Indicator or general purpose input (active low).

TX4

UART channel 4 Transmit Data or infrared transmit data.

RX4

UART channel 4 Receive Data or infrared receive data. Normal RXD input
idles at logic 1 condition. The infrared pulses can be inverted internally prior
the decoder by FCTR[4].

AME

YPE

ESCRIPTION

XR16L788 OCTAL UART

áç

REV. 1.1.4

RTS4#

UART channel 4 Request to Send or general purpose output (active low). See
description of RTS0# pin.

CTS4#

UART channel 4 Clear to Send or general purpose input (active low). See
description of CTS0# pin.

DTR4#

UART channel 4 Data Terminal Ready or general purpose output (active low).
See description of DTR0# pin.

DSR4#

UART channel 4 Data Set Ready or general purpose input (active low). See
description of DSR0# pin.

CD4#

UART channel 4 Carrier Detect or general purpose input (active low).

RI4#

UART channel 4 Ring Indicator or general purpose input (active low).

TX5

UART channel 5 Transmit Data or infrared transmit data.

RX5

UART channel 5 Receive Data or infrared receive data. Normal RXD input
idles at logic 1 condition. The infrared pulses can be inverted internally prior
the decoder by FCTR[4].

RTS5#

UART channel 5 Request to Send or general purpose output (active low). See
description of RTS0# pin.

CTS5#

UART channel 5 Clear to Send or general purpose input (active low). See
description of CTS0# pin.

DTR5#

UART channel 5 Data Terminal Ready or general purpose output (active low).
See description of DTR0# pin.

DSR5#

UART channel 5 Data Set Ready or general purpose input (active low). See
description of DSR0# pin.

CD5#

UART channel 5 Carrier Detect or general purpose input (active low).

RI5#

UART channel 5 Ring Indicator or general purpose input (active low).

TX6

UART channel 6 Transmit Data or infrared transmit data.

RX6

UART channel 6 Receive Data or infrared receive data. Normal RXD input
idles at logic 1 condition. The infrared pulses can be inverted internally prior
the decoder by FCTR[4].

RTS6#

UART channel 6 Request to Send or general purpose output (active low). See
description of RTS0# pin.

CTS6#

UART channel 6 Clear to Send or general purpose input (active low). See
description of CTS0# pin.

DTR6#

UART channel 6 Data Terminal Ready or general purpose output (active low).
See description of DTR0# pin.

DSR6#

UART channel 6 Data Set Ready or general purpose input (active low). See
description of DSR0# pin.

CD6#

UART channel 6 Carrier Detect or general purpose input (active low).

RI6#

UART channel 6 Ring Indicator or general purpose input (active low).

TX7

UART channel 7 Transmit Data or infrared transmit data.

RX7

UART channel 7 Receive Data or infrared receive data. Normal RXD input
idles at logic 1 condition. The infrared pulses can be inverted internally prior
the decoder by FCTR[4].

RTS7#

UART channel 7 Request to Send or general purpose output (active low). See
description of RTS0# pin.

CTS7#

UART channel 7 Clear to Send or general purpose input (active low). See
description of CTS0# pin.

DTR7#

UART channel 7 Data Terminal Ready or general purpose output (active low).
See description of DTR0# pin.

AME

YPE

ESCRIPTION

Part Number XR16L788

Document Outline