xr16v554 Exar Corporation, xr16v554 Datasheet - Page 36

• Manufacturer Part Number: xr16v554
• Description: 2.25v To 3.6v Quad Uart With 16-byte Fifo
• Manufacturer: Exar Corporation

XR16V554/554D
2.25V TO 3.6V QUAD UART WITH 16-BYTE FIFO
F
F
IGURE
IGURE
RXRDY#
RX
INT
(Reading data out
of RX FIFO)
INT*
TXRDY#
IOW#
IOR#
TX
(Unloading)
(Loading data
into THR)
*INT is cleared when the ISR is read or when data is loaded into the THR.
19. T
20. R
IER[1]
enabled
RANSMIT
ECEIVE
T
First Byte is
Received in
WRI
RX FIFO
Start
Bit
S
D0:D7
T
R
Start
Stop
WT
R
Bit
Bit
EADY
EADY
S
ISR is read
& I
T
SSR
T
& I
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
Timeout
IMING
WT
[FIFO M
S
[N
ISR is read
D0:D7
T
D0:D7
ON
SRT
36
-FIFO M
ODE
T
, DMA D
S
ODE
D0:D7
]
FOR
T
ISABLED
S
T
T
WRI
RRI
C
D0:D7
HANNELS
]
T
FOR
T
WT
RX FIFO drops
Trigger Level
below RX
S
C
A-D
HANNELS
D0:D7
ISR is read
D0:D7
T
SRT
Empties
T
FIFO
RR
T
TXNonFIFO
RXINTDMA#
A-D
REV. 1.0.2