xr16l2751im Exar Corporation, xr16l2751im Datasheet - Page 48

• 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
IGURE
(Unloading)
(Loading data
*INT cleared when the ISR is read or when TX FIFO fills up to trigger level.
25. T
into FIFO)
TX
INT*
TXRDY#
IOW#
RANSMIT
enabled
IER[1]
Start
Bit
S
R
D0:D7
EADY
ISR Read
Stop
Bit
T
& I
S
D0:D7
NTERRUPT
TX FIFO fills up
to trigger level
T
T
IMING
D0:D7
[FIFO M
S
TX FIFO
48
Full
D0:D7
T
WRI
ODE
T
, DMA M
T
SRT
S
D0:D7
ODE
T
WT
T
E
S
NABLED
D0:D7
below trigger level
TX FIFO drops
T
T
]
SI
empty location
FOR
At least 1
in FIFO
ISR Read
C
S
xr
HANNELS
Last Data Byte
Transmitted
D0:D7
TXDMA
T
REV. 1.2.2
A & B