xr16l651im Exar Corporation, xr16l651im Datasheet - Page 52

• Manufacturer Part Number: xr16l651im
• Description: 2.25v To 5.5v Uart With 32-byte Fifo
• Manufacturer: Exar Corporation

XR16L651
2.25V TO 5.5V UART WITH 32-BYTE FIFO
F
IGURE
IOR# is shown here as an example. IOR would have the same timing as IOR#, but active high.
(Unloading)
(Loading data
*INT cleared when the ISR is read or when TX FIFO fills up to trigger level.
31. 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
NTERRUPT
D0:D7
TX FIFO fills up
to trigger level
T
T
IMING
D0:D7
[FIFO M
S
TX FIFO
52
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
At least 1
in FIFO
ISR Read
S
áç
áç
áç
áç
Last Data Byte
Transmitted
D0:D7
TXDMA
T
REV. 1.3.0