XR16M581 Exar Corporation, XR16M581 Datasheet - Page 47

• Manufacturer Part Number: XR16M581
• Description: 1.62V To 3.63V UART
• Manufacturer: Exar Corporation

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REV. 1.0.0
F
F
IGURE
IGURE
RX
INT
RXRDY#
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.
into FIFO)
TX
INT*
TXRDY#
IOW#
21. R
22. T
RANSMIT
ECEIVE
TX FIFO
First Byte is
Received in
Empty
enabled
RX FIFO
IER[1]
Start
Bit
S
TX FIFO
Data in
D0:D7
R
Stop
R
EADY
Bit
EADY
S
& I
T
Start
Bit
SSR
ISR is read
S
& I
D0:D7
NTERRUPT
T
D0:D7
WT
NTERRUPT
TX FIFO fills up
to trigger level
T
Stop
Bit
T
Trigger Level or RX Data
1.62V TO 3.63V UART WITH 16-BYTE FIFO AND VLIO INTERFACE
RX FIFO fills up to RX
T
D0:D7
T
T
IMING
S
SSI
Timeout
IMING
D0:D7
[FIFO M
S
[FIFO M
T
D0:D7
S
47
D0:D7
T
WRI
ODE
T
ODE
T
]
S
]
T
SI
D0:D7
T
S
D0:D7
T
below trigger level
S
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
FIFO
RR
T
S
Last Data Byte
Transmitted
RXINTDMA#
D0:D7
XR16M581
TXDMA#
TX FIFO
Empty
T
SRT
T