XR16C2450IJ EXAR [Exar Corporation], XR16C2450IJ Datasheet - Page 13

• Manufacturer Part Number: XR16C2450IJ
• Description: 2.97V TO 5.5V DUART
• Manufacturer: EXAR [Exar Corporation]

xr
REV. 1.0.0
.
See “Receiver” on page 10.
See “Transmitter” on page 9.
The Interrupt Enable Register (IER) masks the interrupts from receive data ready, transmit empty, line status
and modem status registers. These interrupts are reported in the Interrupt Status Register (ISR).
4.0 INTERNAL REGISTER DESCRIPTIONS
4.1
4.2
4.3
A
A2-A0
DDRESS
0 0 0
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
0 0 0
0 0 1
Receive Holding Register (RHR) - Read- Only
Transmit Holding Register (THR) - Write-Only
Interrupt Enable Register (IER) - Read/Write
N
MCR
RHR
MSR
THR
SPR
DLM
R
LCR
LSR
DLL
IER
ISR
AME
EG
RD/WR
RD/WR Divisor
RD/WR
RD/WR
RD/WR
RD/WR
W
R
WR
RD
RD
RD
RD
EAD
RITE
/
Enable
B
Input
T
Bit-7
Bit-7
CD#
Bit-7
Bit-7
Bit-7
ABLE
IT
0
0
0
0
-7
5: INTERNAL REGISTERS DESCRIPTION
Set TX
THR &
Empty
Break
B
Input
Bit-6
Bit-6
TSR
Bit-6
Bit-6
Bit-6
RI#
IT
0
0
0
-6
16C450 Compatible Registers
Baud Rate Generator Divisor
Set Par-
Empty
DSR#
B
Input
Bit-5
Bit-5
THR
Bit-5
Bit-5
Bit-5
ity
IT
0
0
0
-5
13
Internal
Enable
Break
Parity
Loop-
CTS#
B
Even
Input
Bit-4
Bit-4
back
Bit-4
Bit-4
Bit-4
RX
IT
0
0
-4
Modem
Source
Enable
Enable
Enable
Output
OP2#/
Fram-
Parity
B
Error
Delta
Bit-3
Bit-3
Stat.
Bit-3
CD#
Bit-3
Bit-3
Bit-3
INT
INT
Int.
RX
ing
IT
-3
RX Line
(OP1#)
Enable
Source
Rsrvd
Parity
B
Delta
Error
Bit-2
Bit-2
Bit-2
Stop
Bit-2
Bit-2
Bit-2
Stat.
INT
Bits
RI#
Int.
RX
IT
-2
Source
Control
Enable
Length
Output
Empty
DSR#
RTS#
Over-
Word
B
Error
Delta
Bit-1
Bit-1
Bit-1
Bit-1
Bit-1
Bit-1
Bit-1
INT
RX
run
TX
Int
IT
-1
2.97V TO 5.5V DUART
Control
Enable
Source
Length
Output
Ready
DTR#
CTS#
B
Word
Delta
Bit-0
Bit-0
Data
Bit-0
Bit-0
Data
Bit-0
Bit-0
Bit-0
INT
RX
Int.
RX
IT
-0
XR16C2450
LCR[7] = 0
LCR[7] = 1
C
OMMENT