XR17C158 Exar Corporation, XR17C158 Datasheet - Page 28

• Manufacturer Part Number: XR17C158
• Description: Eight-channel Pci-based (UART)
• Manufacturer: Exar Corporation

PRELIMINARY
T
A
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 1
0 0 0 1
0 0 1 0
0 0 1 0
0 0 1 1
0 1 0 0
0 1 0 1
0 1 1 0
0 1 1 1
1 0 0 0
1 0 0 1
1 0 1 0
1 0 1 0
1 0 1 1
1 0 1 1
1 1 0 0
1 1 0 0
1 1 0 1
1 1 1 0
1 1 1 1
A3-A0
ABLE
DDRESS
11: UART CHANNEL CONFIGURATION REGISTERS DESCRIPTION.
XCHAR
TFCNT
RFCNT
RFTRG
TFTRG
XOFF1
XOFF2
FCTR
XON1
XON2
N
MCR
RHR
DLM
MSR
MSR
THR
FCR
LCR
SPR
EFR
R
DLL
LSR
IER
ISR
AME
EG
W
R
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
EAD
RITE
W
W
W
W
W
W
W
W
W
R
R
R
R
R
R
/
CTS/DSR#
CTS/DSR
Int. Enable
Prescaler
RX FIFO
RX FIFO
Enable
Trigger
Divisor
Enable
RS485
Enable
E
FIFOs
DLY-3
B
Table
BRG
Bit-7
Bit-7
Bit-7
Bit-7
Bit-7
TRG
Auto
Bit-7
Bit-7
Bit-7
Bit-7
Bit-7
Bit-7
Bit-7
Bit-7
Bit-1
RROR
CD
IT
0/
0/
0/
0/
0/
-7
RTS/DTR#
RTS/DTR
Int. Enable
RX FIFO
Trigger
Enable
Set TX
Enable
RS485
Enable
FIFOs
Empty
Break
DLY-2
B
Table
Bit-6
Bit-6
Bit-6
Bit-6
Bit-6
TRG
Auto
Bit-6
Bit-6
Bit-6
Bit-6
Bit-6
Bit-6
Bit-6
Bit-6
TSR
Bit-0
IT
IR
RI
0/
0/
0/
0/
0/
-6
Set Parity
Int. Enable
Flow Cntl
TX FIFO
Sp. Char.
Xon/Xoff/
XonAny
Special
Trigger
RS485
RS485
Enable
Empty
Select
Delta-
DLY-1
B
DSR
Char
Bit-5
Bit-5
Bit-5
Bit-5
THR
Bit-5
Auto
Bit-5
Bit-5
Bit-5
Bit-5
Bit-5
Bit-5
Bit-5
Bit-5
IT
0/
0/
0/
0/
0/
-5
28
RX Break RX Fram-
Xoff/spe-
RX Input
TX FIFO
Lopback
Invert IR
cial char
Internal
IER [7:4],
ISR [5:4],
FCR[5:4],
MCR[7:5]
MSR[7:4]
Trigger
Enable
RS485
DLY-0
Parity
Enable
B
Even
Bit-4
Bit-4
Bit-4
Bit-4
Bit-4
Bit-4
Bit-4
Bit-4
Bit-4
Bit-4
Bit-4
Bit-4
Bit-4
CTS
IT
0/
0/
0/
0
-4
Status Int.
RTS/DTR
Hyst Bit-3
Reserved Reserved Reserved Reserved
Flow Cntl
Software
ing Error
Modem
Enable
Source
Enable
Mode
Parity
OP2
B
Delta
DMA
Bit-3
Bit-3
Bit-3
Bit-3
Bit-3
Bit-3
Bit-3
Bit-3
Bit-3
Bit-3
Bit-3
CD#
Bit-3
Bit-3
Bit-3
Bit-3
INT
IT
PCI BUS OCTAL UART
-3
1
Status Int.
RTS/DTR
RX Parity
RTS/DTR
Hyst Bit-2
Flow Cntl
Stop Bits
TX FIFO
Flow Sel
Software
RX Line
Source
Enable
Reset
OP1
B
Delta
Error
Bit-2
Bit-2
Bit-2
Bit-2
Bit-2
Bit-2
Bit-2
Bit-2
Bit-2
Bit-2
Bit-2
Bit-2
Bit-2
Bit-2
Bit-2
INT
RI#
IT
-2
1
/
S
HADED BITS ARE ENABLED BY
TX Empty
RTS# Pin
RTS/DTR
Hyst Bit-1
RX Over-
Flow Cntl
RX FIFO
Software
Xon Det.
Indicator
Control
Enable
Source
Length
Reset
DSR#
B
Word
Delta
Bit-1
Bit-1
Bit-1
Bit-1
Bit-1
Bit-1
Bit-1
Bit-1
Bit-1
Bit-1
Bit-1
Bit-1
Bit-1
Bit-1
Bit-1
Bit-1
INT
Int.
run
IT
-1
DTR# Pin
RTS/DTR
Hyst Bit-0
Flow Cntl
Software
RX Data
RX Data
Xoff Det.
Indicator
Source
Control
Enable
Enable
Length
Ready
FIFOs
CTS#
B
Word
Delta
Bit-0
Bit-0
Bit-0
Bit-0
Bit-0
Bit-0
Bit-0
Bit-0
Bit-0
Bit-0
Bit-0
Bit-0
Bit-0
Bit-0
Bit-0
Bit-0
INT
Int.
IT
-0
XR17C158
User Data
REV. 1.0.0
C
LCR[7]=0
LCR[7]=0
LCR[7]=1
LCR[7]=1
Self-clear
after read
EFR B
OMMENT
IT
-4.