XR16C850CM EXAR [Exar Corporation], XR16C850CM Datasheet - Page 17

• Manufacturer Part Number: XR16C850CM
• Description: 2.97V TO 5.5V UART WITH 128-BYTE FIFO
• Manufacturer: EXAR [Exar Corporation]

F
xr
REV. 2.3.1
N
IGURE
OTE
F
Receive Data
Byte and Errors
: Table-B selected as Trigger Table for
IGURE
128 bytes by 11-bit
12. R
16X Clock
16X Clock
11. R
wide
FIFO
ECEIVER
and Errors
Data Byte
Receive
ECEIVER
O
PERATION IN
O
Receive Data Shift
PERATION IN NON
Register (RSR)
LSR bits
Tags in
Data FIFO
Error
Receive
Receive
4:2
FIFO
Data
Receive Data Shift
Figure 12
Register (RSR)
AND
Holding Register
-FIFO M
Receive Data
A
Validation
Data falls to
UTO
Data Bit
Data fills to
(RHR)
Trigger=16
Example
(Table
FIFO
24
8
RTS F
ODE
: - RX FIFO trigger level selected at 16
17
10).
LOW
control trigger level to restart remote transmitter.
Enable by EFR bit-6=1, MCR bit-1.
Enable by EFR bit-6=1, MCR bit-1.
RTS# re-asserts when data falls below the flow
RTS# de-asserts when data fills above the flow
control trigger level to suspend remote transmitter.
(See Note Below)
RHR Interrupt (ISR bit-2) programmed for
desired FIFO trigger level.
FIFO is Enabled by FCR bit-0=1
Validation
Data Bit
C
2.97V TO 5.5V UART WITH 128-BYTE FIFO
bytes
ONTROL
RHR Interrupt (ISR bit-2)
M
ODE
Receive Data Characters
Receive Data Characters
RXFIFO1
XR16C850
RXFIFO1