xr16c2550ip Exar Corporation, xr16c2550ip Datasheet - Page 31

• Manufacturer Part Number: xr16c2550ip
• Description: Dual Uart With 16-byte Transmit And Receive Fifos
• Manufacturer: Exar Corporation

xr
REV. 1.0.1
F
F
IGURE
IGURE
RXRDY#
RX
INT
IOR#
(Reading data out
of RX FIFO)
(Unloading)
(Loading data
*INT is cleared when the ISR is read or when there is at least one character in the FIFO.
20. R
21. 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
T
WT
WRI
T
Stop
Bit
T
T
D0:D7
longer empty
TX FIFO no
T
T
IMING
SSI
S
IMING
D0:D7
[FIFO M
S
[FIFO M
T
SSR
D0:D7
T
S
31
D0:D7
ODE
T
ODE
, DMA E
T
S
, DMA M
2.97V TO 5.5V DUART WITH 16-BYTE FIFO
D0:D7
T
S
D0:D7
NABLED
T
ODE
S
T
RRI
D0:D7
T
D
S
]
ISABLED
FOR
D0:D7
T
RX FIFO drops
Trigger Level
C
below RX
S
HANNELS
T
]
D0:D7
FOR
T
SI
Empties
T
C
RR
T
FIFO
S
Last Data Byte
HANNELS
Transmitted
A & B
RXFIFODMA
D0:D7
TXDMA#
XR16C2550
TX FIFO
Empty
T
SRT
T
A & B