xr16c864iq Exar Corporation, xr16c864iq Datasheet - Page 24

• Manufacturer Part Number: xr16c864iq
• Description: Quad Uart With Rx/tx Fifo Counters And 128-byte Fifo
• Manufacturer: Exar Corporation

XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
A
A2-A0
X X X
DDRESS
0 0 0
0 0 0
0 0 1
0 0 0
0 0 1
0 0 0
0 0 1
0 1 0
1 0 0
1 0 1
1 1 0
1 1 1
T
ABLE
XOFF1 RD/WR
XOFF2 RD/WR
FSTAT
DREV
XON1 RD/WR
XON2 RD/WR
FCTR RD/WR
N
DVID
DLM
TRG
EFR
R
DLL
FC
AME
EG
9: INTERNAL REGISTERS DESCRIPTION.
RD/WR
RD/WR
RD/WR
R
W
WR
RD
RD
RD
RD
EAD
RITE
/
RDYD#
Enable
RX/TX
CTS#
Mode
B
Bit-7
Bit-7
Bit-7
Bit-7
Bit-7
Auto
Bit-7
Bit-7
Bit-7
Bit-7
RX-
IT
0
-7
SCPAD
RDYC#
Enable
Swap
RTS#
B
Bit-6
Bit-6
Bit-6
Bit-6
Bit-6
Auto
Bit-6
Bit-6
Bit-6
Bit-6
RX-
IT
0
-6
Baud Rate Generator Divisor
Enhanced Registers
Special
RDYB#
Select
B
Table
Char
Bit-5
Bit-5
Bit-5
Bit-5
Bit-5
Bit-1
Bit-5
Bit-5
Bit-5
Bit-5
RX-
Trig
IT
0
-5
24
IER [7:4],
ISR [5:4],
FCR[5:4],
MCR[7:5]
RDYA#
Enable
B
Table
Bit-4
Bit-4
Bit-4
Bit-4
Bit-4
Bit-0
Bit-4
Bit-4
Bit-4
Bit-4
RX-
Trig
IT
1
-4
S
HADED BITS ARE ENABLED WHEN
Direction
RDYD#
Control
RS485
B
Bit-3
Bit-3
Bit-3
Soft-
ware
Flow
Bit-3
Bit-3
Bit-3
Bit-3
Bit-3
Bit-3
Bit-3
Auto
Cntl
TX-
IT
0
-3
RDYC#
RX IR
B
Input
Bit-2
Bit-2
Bit-2
Bit-2
Soft-
ware
Flow
Bit-2
Bit-2
Bit-2
Bit-2
Bit-2
Bit-2
Cntl
Inv.
TX-
IT
1
-2
RDYB#
B
Soft-
ware
Bit-1
Bit-1
Bit-1
Bit-1
Bit-1
Auto
RTS
Hyst
Bit-1
Flow
Bit-1
Bit-1
Bit-1
Bit-1
Bit-1
Cntl
TX-
IT
0
-1
EFR B
RDYA#
B
Bit-0
Bit-0
Bit-0
Bit-0
Auto
Bit-0
Soft-
ware
Flow
Bit-0
Bit-0
Bit-0
Bit-0
Bit-0
Bit-0
RTS
Hyst
Cntl
TX-
áç
áç
áç
áç
IT
0
-0
IT
-4=1
LCR
LCR 0xBF
FSRS# pin is
a logic 0. No
address lines
LCR=0
LCR[7] = 1
LCR[7] = 1
DLM=0x00
DLL=0x00
C
required.
REV. 2.0.1
OMMENT
0xBF
X
BF