IA16450 Datasheet, PDF (6/10 Pages) InnovASIC, Inc – Universal Asynchronous Receiver/Transmitter

IA16450
Page 6 of 10
Preliminary Data Sheet
Universal Asynchronous Receiver/Transmitter
Name
XIN
XOUT
VSS
VCC
Type
I
O
P
P
Description
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
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.
Ground.
+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
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