xr16c2550ip Exar Corporation, xr16c2550ip Datasheet - Page 30

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

XR16C2550
2.97V TO 5.5V DUART WITH 16-BYTE FIFO
F
F
IGURE
IGURE
RX
INT
RXRDY#
IOR#
(Reading data out
of RX FIFO)
INT*
TXRDY#
IOW#
TX
(Unloading)
(Loading data
into THR)
*INT is cleared when the ISR is read or when data is loaded into the THR.
18. T
19. R
IER[1]
enabled
RANSMIT
ECEIVE
T
First Byte is
Received in
WRI
RX FIFO
Start
Bit
S
D0:D7
R
T
Start
Stop
WT
R
Bit
Bit
EADY
EADY
S
ISR is read
T
& I
SSR
T
& I
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
T
IMING
T
SSI
Timeout
IMING
WT
[FIFO M
S
[N
ISR is read
D0:D7
T
ON
D0:D7
SRT
30
-FIFO M
ODE
T
, DMA D
S
ODE
D0:D7
]
FOR
T
ISABLED
S
T
T
WRI
RRI
C
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. 1.0.1