XR16L580_07 EXAR [Exar Corporation], XR16L580_07 Datasheet - Page 45

• Manufacturer Part Number: XR16L580_07
• Description: SMALLEST 2.25V TO 5.5V UART WITH 16-BYTE FIFO AND POWERSAVE
• Manufacturer: EXAR [Exar Corporation]

REV. 1.4.1
F
F
IGURE
IGURE
RX
INT
IOR#
(Reading data out
of RX FIFO)
(Loading data
*INT is cleared when the ISR is read or when TX FIFO fills up to the trigger level.
into FIFO)
TX
INT*
IOW#
23. R
24. T
TX FIFO
Empty
enabled
RANSMIT
ECEIVE
IER[1]
Start
Bit
S
D0:D7
Stop
R
Bit
R
EADY
EADY
S
Start
T
Bit
I
ISR is read
SSR
S
NTERRUPT
D0:D7
I
NTERRUPT
D0:D7
SMALLEST 2.25V TO 5.5V UART WITH 16-BYTE FIFO AND POWERSAVE
TX FIFO fills up
to trigger level
T
Stop
Bit
T
Trigger Level or RX Data
RX FIFO fills up to RX
T
IMING
T
D0:D7
IMING
T
S
SSI
Timeout
D0:D7
[FIFO M
[FIFO M
S
T
D0:D7
S
45
ODE
D0:D7
T
ODE
WRI
T
]
]
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
T
S
XR16L580
Last Data Byte
Transmitted
D0:D7
RXINTDMA#
T
TX INT