XR19L400 Datasheet, PDF (42/45 Pages) Exar Corporation – SINGLE CHANNEL INTEGRATED UART AND RS-485 TRANSCEIVER

XR19L400
PRELIMINARY
SINGLE CHANNEL INTEGRATED UART AND RS-485 TRANSCEIVER
FIGURE 18. RECEIVE READY INTERRUPT TIMING [NON-FIFO MODE]
RX
Start
Bit
D0:D7
Stop
Bit
D0:D7
T_SSR
T_SSR
1 Byte
1 Byte
INT
in RHR
in RHR
IOR#
(Reading data
out of RHR)
T_RR
T_RR
REV. P1.0.0
D0:D7
T_SSR
1 Byte
in RHR
T_RR
RXNFM
FIGURE 19. 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
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.
D0:D7
ISR is read
T_SRT
TXNonFIFO
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