xr16m890 Exar Corporation, xr16m890 Datasheet - Page 59

• Manufacturer Part Number: xr16m890
• Description: Uart With 128-byte Fifo And Integrated Level Shifters
• Manufacturer: Exar Corporation

REV. P1.1.1
F
F
IGURE
IGURE
RXRDY#
RX
INT
IOR#
(Reading data out
of RX FIFO)
(Unloading)
(Loading data
*INT is cleared when the ISR is read or when TX FIFO fills up to the trigger level.
28. R
29. T
into FIFO)
TX
INT*
TXRDY#
IOW#
RANSMIT
ECEIVE
First Byte is
Received in
TX FIFO
Empty
RX FIFO
enabled
IER[1]
Start
Bit
S
TX FIFO
Data in
D0:D7
R
Stop
R
EADY
Bit
EADY
S
& I
T
Start
SSR
& I
Bit
ISR is read
S
D0:D7
NTERRUPT
T
D0:D7
NTERRUPT
WT
TX FIFO fills up
to trigger level
T
Stop
Bit
T
Trigger Level or RX Data
UART WITH 128-BYTE FIFO AND INTEGRATED LEVEL SHIFTERS
RX FIFO fills up to RX
T
D0:D7
T
IMING
T
SSI
S
Timeout
IMING
D0:D7
[FIFO M
PRELIMINARY
S
[FIFO M
T
D0:D7
S
59
D0:D7
T
WRI
ODE
T
ODE
]
T
S
]
T
D0:D7
SI
T
S
T
D0:D7
S
below trigger level
TX FIFO drops
T
RRI
D0:D7
T
S
ISR is read
D0:D7
T
RX FIFO drops
Trigger Level
below RX
S
T
D0:D7
Empties
T
RR
T
FIFO
S
Last Data Byte
RXINTDMA#
Transmitted
XR16M890
D0:D7
TXDMA#
TX FIFO
Empty
T
SRT
T