XR16L580 Datasheet, PDF (13/47 Pages) Exar Corporation – SMALLEST 2.25V TO 5.5V UART WITH 16-BYTE FIFO AND POWERSAVE

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REV. 1.2.0
XR16L580
SMALLEST 2.25V TO 5.5V UART WITH 16-BYTE FIFO AND POWERSAVE
FIGURE 9. RECEIVER OPERATION IN NON-FIFO MODE
16X Clock
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 10. RECEIVER OPERATION IN FIFO AND AUTO RTS FLOW CONTROL MODE
16X Clock
16 bytes by 11-bit
wide
FIFO
Receive Data
Byte and Errors
Receive Data Shift
Register (RSR)
Receive
Data FIFO
Receive
Data
Data Bit
Validation
Receive Data Characters
Example
:
RX FIFO trigger level selected at 8 bytes
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, MCR bit-1.
FIFO Trigger=8 ^{RHR Interrupt (ISR bit-2) programmed 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.
RXFIFO1
13