xr16l2552im Exar Corporation, xr16l2552im Datasheet - Page 14

• Manufacturer Part Number: xr16l2552im
• Description: Industry Smallest Package Uart With 2.25v To 5.5v Operation
• Manufacturer: Exar Corporation

XR16L2552
2.25V TO 5.5V DUART WITH 16-BYTE FIFO
.
F
IGURE
Receive Data
Byte and Errors
10. R
16 bytes by 11-bit
16X Clock
F
ECEIVER
IGURE
wide
FIFO
16X Clock
and Errors
9. R
Data Byte
Receive
O
PERATION IN
ECEIVER
Receive Data Shift
Register (RSR)
O
Data FIFO
PERATION IN NON
LSR bits
Receive
FIFO
Receive
Tags in
Error
Data
4:2
Receive Data Shift
AND
Register (RSR)
Holding Register
Receive Data
A
FIFO Trigger=8
Data fills to 14
Data falls to 4
UTO
Validation
Data Bit
(RHR)
Example
-FIFO M
- RX FIFO trigger level selected at 8 bytes
RTS F
14
:
LOW
ODE
RTS# re-asserts when data falls below the flow
control trigger level to restart remote transmitter.
Enable by EFR bit-6=1, MCR bit-2.
RTS# de-asserts when data fills above the flow
control trigger level to suspend remote transmitter.
Enable by EFR bit-6=1, MCR bit-2.
Validation
Data Bit
RHR Interrupt (ISR bit-2) programmed for
desired FIFO trigger level.
FIFO is Enabled by FCR bit-0=1
C
ONTROL
RHR Interrupt (ISR bit-2)
M
Receive Data Characters
ODE
Receive Data Characters
RXFIFO1
xr
RXFIFO1
REV. 1.1.1