XR16V794 Datasheet, PDF (4/53 Pages) Exar Corporation – HIGH PERFORMANCE 2.25V TO 3.6V QUAD UART WITH FRACTIONAL

XR16V794
HIGH PERFORMANCE 2.25V TO 3.6V QUAD UART WITH FRACTIONAL BAUD RATE
REV. 1.0.0
NAME
DTR0#
DSR0#
CD0#
RI0#
TX1
RX1
RTS1#
CTS1#
DTR1#
DSR1#
CD1#
RI1#
TX2
RX2
RTS2#
CTS2#
DTR2#
DSR2#
CD2#
RI2#
PIN #
54
58
57
56
48
41
46
42
47
43
44
45
40
33
38
34
39
35
36
37
TYPE
DESCRIPTION
O ^{UART channel 0 Data Terminal Ready or general purpose output (active low).}
This port must be asserted prior using for one of two functions:
1) auto DTR flow control, see EFR bit-6, FCTR bits-0 to 3, MCR bits-0 & 2, and IER
bit-6
2) Auto RS485 half-duplex direction control, see FCTR bit-5, MCR bit-2 and MSR
bit 4-7.
I ^{UART channel 0 Data Set Ready or general purpose input (active low). It can be}
used for auto DSR flow control, see EFR bit-7, MCR bit-2 and IER bit-7.
I UART channel 0 Carrier Detect or general purpose input (active low).
I UART channel 0 Ring Indicator or general purpose input (active low).
O ^{UART channel 1 Transmit Data or infrared transmit data. Normal TXD output idles}
HIGH while infrared TXD output idles LOW.
I ^{UART channel 1 Receive Data or infrared receive data. Normal RXD input idles}
HIGH while infrared RXD input idles LOW. In the infrared mode, the polarity of the
incoming RXD signal can be selected via FCTR bit-4. If this bit is a logic 0, a LOW
on the RXD input is considered a mark and if this bit is a logic 1, a HIGH on the
RXD input is considered a space.
O UART channel 1 Request to Send or general purpose output (active low). See
description of RTS0# pin.
I UART channel 1 Clear to Send or general purpose input (active low). See descrip-
tion of CTS0# pin.
O UART channel 1 Data Terminal Ready or general purpose output (active low). See
description of DTS0# pin.
I UART channel 1 Data Set Ready or general purpose input (active low). See
description of DSR0# pin.
I UART channel 1 Carrier Detect or general purpose input (active low).
I UART channel 1 Ring Indicator or general purpose input (active low).
O ^{UART channel 2 Transmit Data or infrared transmit data. Normal TXD output idles}
HIGH while infrared TXD output idles LOW.
I ^{UART channel 2 Receive Data or infrared receive data. Normal RXD input idles}
HIGH while infrared RXD input idles LOW. In the infrared mode, the polarity of the
incoming RXD signal can be selected via FCTR bit-4. If this bit is a logic 0, a LOW
on the RXD input is considered a mark and if this bit is a logic 1, a HIGH on the
RXD input is considered a space.
O UART channel 2 Request to Send or general purpose output (active low). See
description of RTS0# pin.
I UART channel 2 Clear to Send or general purpose input (active low). See descrip-
tion of CTS0# pin.
O UART channel 2 Data Terminal Ready or general purpose output (active low). See
description of DTS0# pin.
I UART channel 2 Data Set Ready or general purpose input (active low). See
description of DSR0# pin.
I UART channel 2 Carrier Detect or general purpose input (active low).
I UART channel 2 Ring Indicator or general purpose intput (active low).
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