xr16l2751im Exar Corporation, xr16l2751im Datasheet - Page 47

• 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
F
F
IGURE
IGURE
RXRDY#
RX
INT
IOR#
(Reading data out
of RX FIFO)
(Loading data
*INT is cleared when the ISR is read or when TX FIFO fills up to the trigger level.
23. R
24. T
into FIFO)
TX
INT*
TXRDY#
IOW#
RANSMIT
ECEIVE
TX FIFO
Empty
enabled
IER[1]
Start
Bit
S
TX FIFO
Data in
D0:D7
R
R
EADY
Trigger Level or RX Data
EADY
RX FIFO fills up to RX
Stop
Bit
S
& I
Start
Timeout
D0:D7
& I
Bit
ISR is read
S
NTERRUPT
T
D0:D7
NTERRUPT
WT
TX FIFO fills up
to trigger level
T
Stop
Bit
T
T
D0:D7
2.25V TO 5.5V DUART WITH 64-BYTE FIFO AND POWERSAVE
T
T
IMING
SSI
S
IMING
D0:D7
[FIFO M
S
[FIFO M
T
SSR
D0:D7
T
S
47
D0:D7
T
WRI
ODE
T
ODE
, DMA E
T
S
, DMA M
T
D0:D7
SI
T
S
D0:D7
NABLED
T
ODE
below trigger level
S
TX FIFO drops
T
RRI
D0:D7
T
D
S
]
ISABLED
ISR is read
FOR
D0:D7
T
RX FIFO drops
Trigger Level
C
below RX
S
HANNELS
T
]
D0:D7
FOR
Empties
T
C
RR
T
FIFO
S
Last Data Byte
HANNELS
Transmitted
A & B
RXFIFODMA
D0:D7
TXDMA#
TX FIFO
XR16L2751
Empty
T
SRT
T
A & B