xr16v554 Exar Corporation, xr16v554 Datasheet - Page 38

• 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
IGURE
(Unloading)
(Loading data
*INT cleared when the ISR is read or when TX FIFO fills up to trigger level.
into FIFO)
TX
INT*
TXRDY#
IOW#
23. T
RANSMIT
enabled
IER[1]
Start
Bit
S
R
D0:D7
EADY
ISR Read
Stop
Bit
T
S
& I
D0:D7
NTERRUPT
TX FIFO fills up
to trigger level
T
T
IMING
D0:D7
[FIFO M
S
TX FIFO
38
Full
D0:D7
T
WRI
ODE
T
T
, DMA M
SRT
S
D0:D7
ODE
T
WT
T
E
S
NABLED
D0:D7
below trigger level
TX FIFO drops
T
T
SI
]
empty location
FOR
At least 1
in FIFO
ISR Read
C
S
Last Data Byte
HANNELS
Transmitted
D0:D7
TXDMA
T
REV. 1.0.2
A-D