xr16c2552ij Exar Corporation, xr16c2552ij Datasheet - Page 32

• Manufacturer Part Number: xr16c2552ij
• Description: 2.97v To 5.5v Dual Uart With 16-byte Fifo
• Manufacturer: Exar Corporation

XR16C2552
2.97V TO 5.5V DUAL UART WITH 16-BYTE FIFO
F
F
IGURE
IGURE
(Unloading)
(Loading data
(Unloading)
*INT is cleared when the ISR is read or when there is at least one character in the FIFO.
(Loading data
*INT is cleared when the ISR is read or when there is at least one character in the FIFO.
into FIFO)
TX
INT*
TXRDY#
IOW#
into FIFO)
20. T
21. T
TX
INT*
TXRDY#
IOW#
RANSMIT
RANSMIT
TX FIFO
TX FIFO
Empty
Empty
enabled
enabled
IER[1]
IER[1]
TX FIFO
Data in
R
R
EADY
EADY
Start
Start
Bit
ISR is read
Bit
S
ISR is read
& I
& I
S
T
D0:D7
D0:D7
T
WT
T
NTERRUPT
NTERRUPT
WRI
WRI
Stop
Stop
Bit
Bit
T
T
longer empty
longer empty
TX FIFO no
TX FIFO no
T
T
S
S
IMING
IMING
D0:D7
D0:D7
[FIFO M
[FIFO M
T
T
S
S
TX FIFO
32
Full
D0:D7
D0:D7
ODE
ODE
T
T
T
, DMA M
, DMA M
SRT
T
T
S
S
D0:D7
D0:D7
T
ODE
ODE
WT
T
T
D
E
S
S
NABLED
ISABLED
D0:D7
D0:D7
T
T
]
empty location
]
FOR
At least 1
FOR
in FIFO
T
T
SI
SI
C
C
S
S
Last Data Byte
Last Data Byte
xr
HANNELS
HANNELS
Transmitted
Transmitted
D0:D7
D0:D7
TXDMA#
TXDMA
TX FIFO
TX FIFO
Empty
Empty
T
SRT
T
T
REV. 1.0.0
A & B
A & B