xr16l2550im Exar Corporation, xr16l2550im Datasheet - Page 21

• Manufacturer Part Number: xr16l2550im
• Description: Industry Smallest Package Uart With 2.25v To 5.5v Operation
• Manufacturer: Exar Corporation

REV. 1.1.2
A
A2-A0
DDRESS
0 0 0
0 0 0
0 0 1
0 1 0
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
0 0 0
0 0 1
0 0 0
0 0 1
T
ABLE
DREV
N
DVID
MCR
RHR
MSR
DLM
THR
FCR
LCR
SPR
R
LSR
DLL
IER
ISR
AME
EG
8: INTERNAL REGISTERS DESCRIPTION.
RD/WR
RD/WR Divisor
RD/WR
RD/WR
RD/WR
RD/WR
W
R
WR
WR
RD
RD
RD
RD
RD
RD
EAD
RITE
/
RX FIFO
RX FIFO
CTS Int.
Enabled
Enable
Trigger
Enable
Global
FIFOs
B
Pres-
BRG
caler
Error
Input
Bit-7
Bit-7
CD#
Bit-7
Bit-7
Bit-7
Bit-7
IT
0/
0/
0
-7
RX FIFO
IR Mode
RTS Int.
Enabled
ENable
Enable
Trigger
Set TX
THR &
FIFOs
Empty
Break
B
Input
Bit-6
Bit-6
Bit-6
Bit-6
Bit-6
Bit-6
TSR
RI#
IT
0/
0/
0
-6
16C550 Compatible Registers
Baud Rate Generator Divisor
Set Par-
XonAny
Xoff Int.
Enable
Source
Empty
DSR#
B
Input
Bit-5
Bit-5
Bit-5
THR
Bit-5
Bit-5
Bit-5
Bit-5
INT
IT
ity
0/
0/
0/
0
0
-5
21
Lopback
Internal
Source
Enable
Enable
Break
Sleep
Mode
Parity
CTS#
B
Even
Input
Bit-4
Bit-4
Bit-4
Bit-4
Bit-4
Bit-4
Bit-4
INT
RX
IT
0/
0/
0
0
-4
S
LOW VOLTAGE DUART WITH 16-BYTE FIFO
HADED BITS ARE ENABLED WHEN
Modem
Source
Enable
Enable
Enable
Output
Enable
OP2#/
Fram-
Mode
Parity
B
Delta
DMA
Error
Bit-3
Bit-3
Bit-3
Bit-3
Bit-3
Bit-3
Bit-3
Stat.
CD#
INT
INT
Int.
RX
ing
IT
0
-3
RX Line
Source
(OP1#)
Enable
Reset
Parity
B
Delta
FIFO
Rsvd
Error
Bit-2
Bit-2
Bit-2
Bit-2
Bit-2
Bit-2
Bit-2
Stat.
Stop
Bits
INT
RI#
Int.
RX
TX
IT
0
-2
Control
Enable
Source
Length
Output
Empty
DSR#
Reset
RTS#
Over-
Word
B
FIFO
Error
Delta
Bit-1
Bit-1
Bit-1
Bit-1
Bit-1
Bit-1
Bit-1
Bit-1
INT
RX
RX
run
TX
Int
IT
1
-1
Control
Enable
Source
Enable
Length
Output
Ready
FIFOs
DTR#
CTS#
B
Word
Delta
Bit-0
Bit-0
Data
Bit-0
Bit-0
Data
Bit-0
Bit-0
Bit-0
Bit-0
INT
RX
Int.
RX
EFR B
IT
0
-0
XR16L2550
IT
LCR ≠ 0xBF
LCR ≠ 0xBF
-4=1
LCR[7] = 0
DLM=0x00
DLL=0x00
C
LCR[7]=1
LCR[7]=1
OMMENT