XR16M570 Datasheet, PDF (15/52 Pages) Exar Corporation – 1.62V TO 3.63V HIGH PERFORMANCE UART WITH 16-BYTE FIFO

REV. 1.0.0
XR16M570
1.62V TO 3.63V HIGH PERFORMANCE UART WITH 16-BYTE FIFO
FIGURE 10. RECEIVER OPERATION IN NON-FIFO MODE
16X or 8X or 4X Clock
( DLD[5:4] )
Receive Data Shift Data Bit
Register (RSR)
Validation
Receive Data Characters
Receive
Data Byte
and Errors
Error
Tags in
LSR bits
4:2
Receive Data
Holding Register
(RHR)
RHR Interrupt (ISR bit-2)
RXFIFO1
FIGURE 11. RECEIVER OPERATION IN FIFO AND AUTO RTS FLOW CONTROL MODE
16X or 8X or 4X Clock
( DLD[5:4] )
16 bytes by 11-bit wide
FIFO
Receive Data
Byte and Errors
Receive Data Shift
Register (RSR)
R e c e iv e
Data FIFO
R e c e iv e
Data
Data Bit
V a lid a tio n
Receive Data Characters
E x a m p le
: - RX FIFO trigger level selected at 8 bytes
(See Note Below)
Data falls to
4
RTS# re-asserts when data falls below the flow
control trigger level to restart remote transmitter.
Enable by EFR bit-6=1, M CR bit-1.
FIFO
Trigger=8
RHR Interrupt (ISR bit-2) programm ed for
desired FIFO trigger level.
FIFO is Enabled by FCR bit-0=1
Data fills to
14
RTS# de-asserts when data fills above the flow
control trigger level to suspend remote transmitter.
Enable by EFR bit-6=1, MCR bit-1.
RXFIFO 1
15