ST16C654D Exar Corporation, ST16C654D Datasheet - Page 44

• Manufacturer Part Number: ST16C654D
• Description: St16c654d -quad Uart With 64-byte Fifo And Infrared Irda Encoder/decoder
• Manufacturer: Exar Corporation

ST16C654/654D
2.97V TO 5.5V QUAD UART WITH 64-BYTE FIFO
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#
23. R
24. T
RANSMIT
ECEIVE
TX FIFO
Empty
enabled
IER[1]
Start
Bit
S
TX FIFO
Data in
D0:D7
R
R
EADY
Trigger Level or RX Data
EADY
RX FIFO fills up to RX
Stop
Bit
S
& I
Start
Bit
ISR is read
S
& I
Timeout
D0:D7
T
NTERRUPT
D0:D7
WT
NTERRUPT
TX FIFO fills up
to trigger level
Stop
T
Bit
T
T
D0:D7
T
IMING
T
S
SSI
IMING
D0:D7
[FIFO M
S
[FIFO M
T
T
SSR
D0:D7
S
44
D0:D7
T
WRI
ODE
T
ODE
T
, DMA E
S
, DMA M
T
SI
D0:D7
T
S
D0:D7
NABLED
T
below trigger level
ODE
TX FIFO drops
S
T
RRI
D0:D7
T
D
S
]
ISR is read
ISABLED
FOR
D0:D7
T
RX FIFO drops
Trigger Level
C
below RX
T
S
HANNELS
]
D0:D7
FOR
C
Empties
T
S
Last Data Byte
xr
RR
T
FIFO
HANNELS
Transmitted
D0:D7
A-D
RXFIFODMA
TXDMA#
TX FIFO
Empty
T
SRT
T
REV. 5.0.2
A-D