xr16c2552ij Exar Corporation, xr16c2552ij Datasheet - Page 16

• Manufacturer Part Number: xr16c2552ij
• Description: 2.97v To 5.5v Dual Uart With 16-byte Fifo
• Manufacturer: Exar Corporation

XR16C2552
2.97V TO 5.5V DUAL UART WITH 16-BYTE FIFO
.
See “Receiver” on page 12.
See “Transmitter” on page 11.
4.0 INTERNAL REGISTER DESCRIPTIONS
4.1
4.2
A
A2-A0
DDRESS
0 1 0
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
Receive Holding Register (RHR) - Read- Only
Transmit Holding Register (THR) - Write-Only
N
MCR
MSR
RHR
THR
FCR
SPR
DLM
LCR
LSR
AFR
R
DLL
IER
ISR
AME
EG
RD/WR
RD/WR Divisor
RD/WR
RD/WR
RD/WR
RD/WR
RD/WR
R
W
WR
WR
RD
RD
RD
RD
EAD
RITE
/
RX FIFO
RX FIFO
Enabled
Trigger
Enable
Global
FIFOs
T
B
Error
Input
Bit-7
Bit-7
Bit-1
Bit-7
Bit-7
Bit-7
CD#
ABLE
IT
0
0
0
-7
7: INTERNAL REGISTERS DESCRIPTION.
RX FIFO
Enabled
Trigger
Set TX
THR &
Empty
FIFOs
Break
B
Input
Bit-6
Bit-6
Bit-0
TSR
Bit-6
Bit-6
Bit-6
RI#
IT
0
0
0
-6
16C550 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
0
0
-5
16
Internal
Enable
Parity
Loop-
Break
CTS#
B
Even
Input
back
Bit-4
Bit-4
Bit-4
Bit-4
Bit-4
RX
IT
0
0
0
0
-4
Modem
Control
Enable
Source
Enable
Enable
Output
Fram-
Parity
OP2#
Mode
B
Delta
DMA
Error
Bit-3
Bit-3
Stat.
Bit-3
CD#
Bit-3
Bit-3
Bit-3
INT
Int.
RX
ing
IT
0
-3
RX Line
Enable
Source
(OP1#)
RXRDY#
Reset
Parity
B
Delta
FIFO
Rsvd
Error
Bit-2
Bit-2
Bit-2
Bit-2
Bit-2
Bit-2
Select
Stat.
Stop
Bits
INT
RI#
Int.
RX
TX
IT
-2
Baudout#
Control
Enable
Source
Length
Output
Empty
DSR#
Reset
RTS#
Word
Over-
B
FIFO
Delta
Error
Select
Bit-1
Bit-1
Bit-1
Bit-1
Bit-1
Bit-1
Bit-1
INT
run
RX
RX
TX
Int
IT
-1
rent Write
Enable
Source
Enable
Control
Length
Output
Ready
FIFOs
Concur-
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
xr
LCR[7] = 0
LCR[7] = 1
C
OMMENT
REV. 1.0.0