xr16l651im Exar Corporation, xr16l651im Datasheet - Page 50

• 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
F
IGURE
IGURE
INT*
IOW#
*INT is cleared when the ISR is read or when data is loaded into the THR.
RX
INT
RXRDY#
TX
(Unloading)
TXRDY#
(Loading data
into THR)
IOR#
(Reading data out
of RX FIFO)
IOR# is shown here as an example. IOR would have the same timing as IOR#, but active high.
IOW# is shown here as an example. IOW would have the same timing as IOW#, but active high.
27. T
28. R
IER[1]
enabled
RANSMIT
ECEIVE
T
First Byte is
Received in
WRI
RX FIFO
Start
Bit
S
D0:D7
R
T
Start
R
WT
Stop
Bit
EADY
Bit
EADY
S
ISR is read
& I
T
& I
T
SSR
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
IMING
T
T
SSI
IMING
Timeout
WT
[FIFO M
S
[N
ISR is read
D0:D7
T
ON
D0:D7
SRT
50
-FIFO M
ODE
T
, DMA D
S
ODE
D0:D7
]
T
ISABLED
S
T
T
WRI
RRI
D0:D7
]
T
T
WT
RX FIFO drops
Trigger Level
below RX
S
D0:D7
ISR is read
D0:D7
T
SRT
Empties
T
RR
T
FIFO
áç
áç
áç
áç
TXNonFIFO
RXINTDMA#
REV. 1.3.0