XR16V798 Datasheet, PDF (52/56 Pages) Exar Corporation – HIGH PERFORMANCE 2.25V TO 3.6V OCTAL UART WITH FRACTIONAL BAUD RATE

XR16V798
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HIGH PERFORMANCE 2.25V TO 3.6V OCTAL UART WITH FRACTIONAL BAUD RATE
REV. 1.0.0
FIGURE 20. TRANSMIT INTERRUPT TIMING [NON-FIFO MODE]
TX
(U nloading)
IE R [1 ]
e n a b le d
IN T # *
T _{W RI}
S tart
B it
D 0:D 7
S top
B it
IS R is read
T _{W RI}
D 0 :D 7
IS R is read
T_{W RI}
D 0:D 7
IS R is read
IO W #
(Loading data
into TH R )
*TX interrupt is cleared w hen the IS R is read or w hen data is loaded into the TH R .
FIGURE 21. RECEIVE INTERRUPT TIMING [FIFO MODE]
Start
Bit
RX
S D0:D7 S D0:D7 T
D0:D7 S D0:D7 T S D0:D7 T S D0:D7 T S D0:D7 T
INT#
T_SSI
RX FIFO fills up to RX
Trigger Level or RX Data
Tim eout
RX FIFO drops
below RX
Trigger Level
T_RRI
T_RR
IOR#
(Reading data out
of RX FIFO)
FIGURE 22. TRANSMIT INTERRUPT TIMING [FIFO MODE]
TX FIFO
Em pty
TX
(Unloading)
INT#*
IER[1]
enabled
IOW #
(Loading data
into FIFO)
Start
B it
Stop
Bit
S D0:D7 T
ISR is read
S D0:D7 T S D0:D7 T
T S D0:D7 T S D0:D7 T
T_SI
ISR is read
TX FIFO fills up
to trigger level
T_{W RI}
TX FIFO drops
below trigger level
*TX interrupt is cleared when the ISR is read or when TX FIFO fills up to the trigger level.
Last Data Byte
Transm itted
S D0:D7 T
52