Page 6 of 10

IA16450

Preliminary Data Sheet

Universal Asynchronous Receiver/Transmitter

Copyright

© 1999, InnovASIC Inc.

Customer Specific IC Solutions

Name

Type

Description

XIN

I

External Crystal Input. This signal iniput is used in conjuction

with XOUT to form a feedback circuit for the baud rate

generator’s oscillator. If a clock signal will be generated off-

chip, then it should drive the baud rate generator through this

pin

XOUT

O

External Crystal Output. This signal output is used in

conjuction with XIN to form a feedback circuit for the baud

rate generator’s oscillator. If the clock signal will be generated

off-chip, then this pin is unused.

VSS

P

Ground.

VCC

P

+5V power.

IA16450 Register Address Map

Table 2

DLAB

A2

A1

A0

REGISTER DESCRIPTION

0

0

0

0

Receiver Buffer - Read Only

Transmitter Holding Register - Write Only

1

0

0

0

Divisor Latch (LSB)

0

0

0

1

Interrupt Enable Register

1

0

0

1

Divisor Latch (MSB)

X

0

1

0

Interrupt ID Register

X

0

1

1

Line Control Register

X

1

0

0

MODEM Control Register

DATA

X

1

0

1

Line Status Register

X

1

1

0

MODEM Status Register

X

1

1

1

Scratch