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IA16450
Preliminary Data Sheet
Universal Asynchronous Receiver/Transmitter
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
VCC
P
P
Ground.
+5V power.
IA16450 Register Address Map
Table 2
DLAB
A2
A1
A0
REGISTER DESCRIPTION
Receiver Buffer - Read Only
0
0
0
0
Transmitter Holding Register - Write Only
1
0
0
0
0
0
0
1
1
0
0
0
1
1
0
0
0
1
1
0
1
0
1
Divisor Latch (LSB)
Interrupt Enable Register
Divisor Latch (MSB)
1
X
X
X
Interrupt ID Register
Line Control Register
MODEM Control Register
Line Status Register
X
X
X
1
1
1
1
0
1
MODEM Status Register
Scratch
Copyright ã 1999, InnovASIC Inc.
Customer Specific IC Solutions
INNOVASIC [ INNOVASIC, INC ]
