xr16l2751im Exar Corporation, xr16l2751im Datasheet - Page 46

• Manufacturer Part Number: xr16l2751im
• Description: 2.25v To 5.5v Duart With 64-byte Fifo And Powersave
• Manufacturer: Exar Corporation

XR16L2751
2.25V TO 5.5V DUART WITH 64-BYTE FIFO AND POWERSAVE
F
F
IGURE
IGURE
INT*
TXRDY#
IOW#
RX
INT
RXRDY#
TX
(Unloading)
(Loading data
into THR)
IOR#
(Reading data out
of RX FIFO)
*INT is cleared when the ISR is read or when data is loaded into the THR.
21. T
22. R
IER[1]
enabled
RANSMIT
ECEIVE
T
First Byte is
Received in
WRI
RX FIFO
Start
Bit
S
D0:D7
R
T
Start
WT
Stop
R
Bit
EADY
Bit
EADY
S
ISR is read
& I
T
T
& I
SSR
D0:D7
D0:D7
SRT
NTERRUPT
NTERRUPT
T
T
WRI
Trigger Level or RX Data
Stop
RX FIFO fills up to RX
Bit
T
D0:D7
T
IMING
T
T
SSI
IMING
Timeout
WT
[FIFO M
S
[N
ISR is read
D0:D7
T
ON
D0:D7
SRT
46
-FIFO M
ODE
T
, DMA D
S
ODE
D0:D7
]
FOR
T
ISABLED
S
T
T
WRI
C
RRI
D0:D7
HANNELS
]
T
FOR
T
WT
RX FIFO drops
Trigger Level
below RX
S
C
A & B
HANNELS
D0:D7
ISR is read
D0:D7
T
SRT
Empties
T
RR
T
FIFO
xr
TXNonFIFO
RXINTDMA#
A & B
REV. 1.2.2