ST16C654D Exar Corporation, ST16C654D Datasheet - Page 43

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

xr
REV. 5.0.2
F
F
IGURE
IGURE
RX
INT
RXRDY#
IOR#
(Reading data out
of RX FIFO)
(Unloading)
INT*
TXRDY#
IOW#
(Loading data
into THR)
TX
*INT is cleared when the ISR is read or when data is loaded into the THR.
21. T
22. R
IER[1]
enabled
RANSMIT
T
ECEIVE
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
T
IMING
T
SSI
Timeout
IMING
WT
[FIFO M
S
[N
ISR is read
D0:D7
T
D0:D7
ON
SRT
43
-FIFO M
ODE
T
2.97V TO 5.5V QUAD UART WITH 64-BYTE FIFO
, 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
RR
T
FIFO
ST16C654/654D
TXNonFIFO
RXINTDMA#
A-D