xr16c2852ij Exar Corporation, xr16c2852ij Datasheet - Page 46

• Manufacturer Part Number: xr16c2852ij
• Description: 2.97v To 5.5v Dual Uart With 128-byte Fifos
• Manufacturer: Exar Corporation

XR16C2852
2.97V TO 5.5V DUAL UART WITH 128-BYTE FIFOS
F
F
IGURE
IGURE
(Unloading)
(Loading data
(Unloading)
(Loading data
*INT cleared when the ISR is read or when TX FIFO fills up to trigger level.
*INT is cleared when the ISR is read or when TX FIFO fills up to the trigger level.
into FIFO)
into FIFO)
TX
INT*
TXRDY#
IOW#
TX
INT*
TXRDY#
IOW#
24. T
25. T
RANSMIT
RANSMIT
TX FIFO
enabled
Empty
enabled
IER[1]
IER[1]
TX FIFO
Data in
Start
Bit
S
R
R
D0:D7
EADY
EADY
ISR Read
Stop
Bit
T
Start
Bit
ISR is read
S
S
& I
& I
T
D0:D7
D0:D7
WT
NTERRUPT
NTERRUPT
TX FIFO fills up
to trigger level
TX FIFO fills up
to trigger level
Stop
Bit
T
T
T
T
S
IMING
IMING
D0:D7
D0:D7
[FIFO M
[FIFO M
T
S
S
TX FIFO
46
Full
D0:D7
D0:D7
T
T
WRI
WRI
ODE
ODE
T
T
T
, DMA M
, DMA M
T
SRT
SI
T
S
S
D0:D7
D0:D7
below trigger level
T
ODE
ODE
TX FIFO drops
WT
T
T
D
E
S
S
ISR is read
NABLED
ISABLED
D0:D7
D0:D7
below trigger level
TX FIFO drops
T
T
T
SI
]
empty location
]
FOR
FOR
At least 1
in FIFO
ISR Read
C
C
S
S
Last Data Byte
Last Data Byte
xr
HANNELS
HANNELS
Transmitted
Transmitted
D0:D7
D0:D7
TXDMA#
TX FIFO
TXDMA
Empty
T
SRT
T
T
REV. 2.1.1
A & B
A & B