XR16L580 Datasheet, PDF (41/47 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 21. TRANSMIT READY INTERRUPT TIMING [NON-FIFO MODE]
TX
(Unloading)
IER[1]
enabled
Start
Bit
D0:D7
Stop
Bit
ISR is read
D0:D7
ISR is read
D0:D7
ISR is read
INT*
T_WRI
T_WRI
T_WRI
IOW#
(Loading data
into THR)
T_SRT
T_SRT
*INT is cleared when the ISR is read or when data is loaded into the THR.
T_SRT
TXNonFIFO
FIGURE 22. RECEIVE READY 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
Stop
Bit
INT
T_SSR
IOR#
(Reading data out
of RX FIFO)
T_SSI
RX FIFO fills up to RX
Trigger Level or RX Data
Timeout
RX FIFO drops
below RX
Trigger Level
T_RRI
RXINTDMA#
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