xr16l2751im Exar Corporation, xr16l2751im Datasheet - Page 23

• Manufacturer Part Number: xr16l2751im
• Description: 2.25v To 5.5v Duart With 64-byte Fifo And Powersave
• Manufacturer: Exar Corporation

xr
REV. 1.2.2
.
A
A2-A0
DDRESS
1 1 1
1 1 1
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
T
ABLE
EMSR
N
MCR
FLVL
RHR
MSR
THR
FCR
SPR
R
LCR
LSR
IER
ISR
AME
EG
9: INTERNAL REGISTERS DESCRIPTION.
RD/WR
RD/WR Divisor
RD/WR
RD/WR
W
R
WR
WR
WR
RD
RD
RD
RD
RD
EAD
RITE
/
RX FIFO
RX FIFO
CTS Int.
Enabled
Enable
Trigger
Enable
FIFOs
Global
Mode
Pres-
B
BRG
caler
Error
Input
Sam-
pling
Rate
Bit-7
Bit-7
CD#
Bit-7
Bit-7
16X
IT
0/
0/
-7
RX FIFO
Imd/Dly#
IR Mode
RTS Int.
Enabled
ENable
Enable
Trigger
Set TX
THR &
FIFOs
Empty
Break
B
Input
Error
Inter-
Bit-6
Bit-6
TSR
Bit-6
rupt.
Bit-6
LSR
RI#
IT
0/
0/
-6
16C550 Compatible Registers
2.25V TO 5.5V DUART WITH 64-BYTE FIFO AND POWERSAVE
TX FIFO
Set Par-
Xoff Int.
XonAny
Source
Enable
Trigger
Empty
DSR#
B
Input
Hyst.
Bit-5
Bit-5
Bit-5
THR
Bit-5
Auto
RTS
Bit-5
bit-3
INT
ity
IT
0/
0/
0/
0/
-5
23
TX FIFO
Lopback
Internal
Source
Trigger
Enable
Enable
Break
Sleep
Mode
Parity
CTS#
B
Even
Input
Hyst.
Bit-4
Bit-4
Bit-4
Bit-4
Auto
Bit-4
RTS
bit-2
INT
RX
IT
0/
0/
0/
-4
S
HADED BITS ARE ENABLED WHEN
OP2#/INT
RX Fram-
Inversion
ing Error
Stat. Int.
Modem
Enable
Source
Enable
Enable
Enable
Output
RS485
Output
Parity
Mode
B
Delta
DMA
Bit-3
Bit-3
Bit-3
CD#
Bit-3
Auto
Bit-3
INT
IT
-3
RX Line
(OP1#)
Enable
Source
Reset
Rsrvd
Parity
Rsrvd
B
FIFO
Delta
Error
Bit-2
Bit-2
Stat.
Bit-2
Stop
Bit-2
Bit-2
INT
Bits
RI#
Int.
RX
TX
IT
-2
Source
Control
Enable
Length
Output
Empty
Reset
DSR#
Count
RTS#
Over-
B
Word
Delta
Rx/Tx
FIFO
Error
FIFO
Bit-1
Bit-1
Bit-1
Bit-1
Bit-1
Bit-1
bit-1
INT
RX
RX
run
TX
Int
IT
-1
EFR B
Control
Enable
Source
Enable
Length
Output
FIFOs
Ready
Count
DTR#
CTS#
Rx/Tx
B
Word
Delta
FIFO
Bit-0
Bit-0
Data
Bit-0
Bit-0
Data
Bit-0
Bit-0
bit-0
INT
RX
Int.
RX
IT
-0
IT
XR16L2751
-4=1
LCR ≠ 0
LCR ≠ 0
LCR ≠ 0
LCR ≠ 0xBF
FCTR[6]=1
FCTR[6]=0
LCR[7]=0
C
OMMENT
X
X
X
BF
BF
BF