XR16L784_08 Datasheet, PDF (4/51 Pages) Exar Corporation – HIGH PERFORMANCE 2.97V TO 5.5V QUAD UART

XR16L784
HIGH PERFORMANCE 2.97V TO 5.5V QUAD UART
Pin Descriptions
REV. 1.2.3
NAME
DTR0#
DSR0#
CD0#
PIN #
54
58
57
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).
RI0#
TX1
RX1
RTS1#
56
I UART channel 0 Ring Indicator or general purpose input (active low).
48
O ^{UART channel 1 Transmit Data or infrared transmit data. Normal TXD output}
idles HIGH while infrared TXD output idles LOW.
41
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.
46
O UART channel 1 Request to Send or general purpose output (active low).
See description of RTS0# pin.
CTS1#
42
I UART channel 1 Clear to Send or general purpose input (active low). See
description of CTS0# pin.
DTR1#
47
O UART channel 1 Data Terminal Ready or general purpose output (active low).
See description of DTS0# pin.
DSR1#
43
I UART channel 1 Data Set Ready or general purpose input (active low). See
description of DSR0# pin.
CD1#
44
I UART channel 1 Carrier Detect or general purpose input (active low).
RI1#
TX2
RX2
RTS2#
45
I UART channel 1 Ring Indicator or general purpose input (active low).
40
O ^{UART channel 2 Transmit Data or infrared transmit data. Normal TXD output}
idles HIGH while infrared TXD output idles LOW.
33
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.
38
O UART channel 2 Request to Send or general purpose output (active low).
See description of RTS0# pin.
CTS2#
34
I UART channel 2 Clear to Send or general purpose input (active low). See
description of CTS0# pin.
DTR2#
39
O UART channel 2 Data Terminal Ready or general purpose output (active low).
See description of DTS0# pin.
DSR2#
35
I UART channel 2 Data Set Ready or general purpose input (active low). See
description of DSR0# pin.
CD2#
36
I UART channel 2 Carrier Detect or general purpose input (active low).
RI2#
37
I UART channel 2 Ring Indicator or general purpose intput (active low).
4