xr16c2850im Exar Corporation, xr16c2850im Datasheet - Page 43

• Manufacturer Part Number: xr16c2850im
• Description: Dual Uart With Tx And Rx Fifo Counters, 128 Bytes Of Fifos And Automatic Rs-485 Half Duplex Control
• Manufacturer: Exar Corporation

xr
REV. 2.1.3
F
F
IGURE
IGURE
RXRDY#
RX
INT
IOR#
(Unloading)
INT*
TXRDY#
IOW#
(Loading data
into THR)
(Reading data
out of RHR)
TX
*INT is cleared when the ISR is read or when data is loaded into the THR.
20. R
21. T
IER[1]
enabled
RANSMIT
ECEIVE
T
WRI
R
T
Start
Start
Bit
WT
R
Bit
EADY
EADY
ISR is read
& I
D0:D7
T
& I
D0:D7
SRT
NTERRUPT
NTERRUPT
T
WRI
Stop
Stop
Bit
Bit
T
RR
T
in RHR
1 Byte
Ready
Active
T
IMING
T
T
Data
T
SSR
SSR
IMING
WT
[N
[N
ISR is read
ON
T
D0:D7
ON
D0:D7
SRT
43
-FIFO M
2.97V TO 5.5V DUAL UART WITH 128-BYTE FIFOS
-FIFO M
ODE
ODE
T
RR
in RHR
1 Byte
]
Active
Ready
T
T
Data
]
FOR
SSR
SSR
FOR
T
C
WRI
C
HANNELS
HANNELS
T
WT
D0:D7
A & B
A & B
ISR is read
D0:D7
T
SRT
TXNonFIFO
T
RR
T
in RHR
1 Byte
Ready
Active
SSR
XR16C2850
T
Data
SSR
RXNFM