ST16C654 EXAR [Exar Corporation], ST16C654 Datasheet - Page 23

• Manufacturer Part Number: ST16C654
• Description: 2.97V TO 5.5V QUAD UART WITH 64-BYTE FIFO
• Manufacturer: EXAR [Exar Corporation]

ST16C654/654D
2.97V TO 5.5V QUAD UART WITH 64-BYTE FIFO
REV. 5.0.0
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
T
ABLE
N
MCR
RHR
MSR
DLM
THR
FCR
LCR
SPR
R
LSR
DLL
IER
ISR
AME
EG
10: INTERNAL REGISTERS DESCRIPTION.
RD/WR
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
Enable
Enable
Trigger
Divisor
Global
FIFOs
CTS#
Pres-
B
BRG
caler
Error
Input
Bit-7
Bit-7
CD#
Bit-7
Bit-7
Bit-7
Int.
IT
0/
0/
-7
RX FIFO
IR Mode
Enabled
ENable
Enable
Trigger
Set TX
THR &
FIFOs
Empty
Break
RTS#
B
Input
Bit-6
Bit-6
Bit-6
Bit-6
Bit-6
TSR
RI#
Int.
IT
0/
0/
-6
16C550 Compatible Registers
Baud Rate Generator Divisor
TX FIFO
Set Par-
XonAny
Xoff Int.
Source
Enable
Trigger
Empty
DSR#
B
Input
Bit-5
Bit-5
Bit-5
THR
Bit-5
Bit-5
Bit-5
INT
IT
ity
0/
0/
0/
0/
-5
23
TX FIFO
Lopback
Internal
Source
Enable
Trigger
Enable
Break
Sleep
Mode
Parity
CTS#
B
Even
Input
Bit-4
Bit-4
Bit-4
Bit-4
Bit-4
Bit-4
INT
RX
IT
0/
0/
0/
-4
S
HADED BITS ARE ENABLED WHEN
RX Fram-
INT Out-
ing Error
Stat. Int.
Modem
Source
(OP2#)
Enable
Enable
Enable
Enable
Mode
Parity
B
DMA
Delta
Bit-3
Bit-3
Bit-3
CD#
Bit-3
Bit-3
Bit-3
INT
put
IT
-3
RX Line
Enable
Source
(OP1#)
Reset
Parity
B
FIFO
Rsvd
Delta
Error
Bit-2
Bit-2
Stat.
Bit-2
Stop
Bit-2
Bit-2
Bit-2
INT
Bits
RI#
Int.
RX
TX
IT
-2
Source
Control
Enable
Length
Output
Empty
Reset
DSR#
RTS#
Over-
B
FIFO
Word
Delta
Error
Bit-1
Bit-1
Bit-1
Bit-1
Bit-1
Bit-1
Bit-1
INT
RX
RX
run
TX
Int
IT
-1
Source
Control
Enable
Enable
Length
Output
Ready
FIFOs
DTR#
EFR B
CTS#
Word
Delta
B
Bit-0
Data
Data
Bit-0
Bit-0
Bit-0
Bit-0
Bit-0
Bit-0
INT
RX
Int.
RX




IT
-0
IT
LCR
-4=1
LCR[7] = 0
LCR[7] = 0
LCR[7] = 0
LCR[7] = 1
C
OMMENT
0xBF