XR16M752_09 Datasheet, PDF (6/54 Pages) Exar Corporation – HIGH PERFORMANCE DUART WITH 64-BYTE FIFO

XR16M752/XR68M752
HIGH PERFORMANCE DUART WITH 64-BYTE FIFO
Pin Description
REV. 1.1.1
NAME
RXA
RTSA#
CTSA#
DTRA#
DSRA#
CDA#
RIA#
OP2A#
TXB
RXB
32-QFN
PIN #
4
23
25
-
-
-
-
-
6
3
48-TQFP
PIN #
5
33
38
34
39
40
41
32
8
4
49-STBGA
PIN #
D2
D5
A5
A7
B6
C5
A4
C6
D1
C3
TYPE
DESCRIPTION
I _{UART channel A Receive Data or infrared receive data.}
Normal receive data input must idle HIGH. The infrared
receiver pulses typically idles at LOW but can be inverted
by software control prior going in to the decoder, see
MCR[6]. If this pin is not used, tie it to VCC or pull it high
via a 100k ohm resistor.
O _{UART channel A Request-to-Send (active low) or general}
purpose output. This output must be asserted prior to
using auto RTS flow control, see EFR[6] and IER[6]. For
auto RS485 half-duplex direction control, see DLD[6].
I _{UART channel A Clear-to-Send (active low) or general}
purpose input. It can be used for auto CTS flow control,
see EFR[7] and IER[7]. This input should be connected to
VCC or GND when not used.
O _{UART channel A Data-Terminal-Ready (active low) or}
general purpose output. If it is not used, leave it uncon-
nected.
I _{UART channel A Data-Set-Ready (active low) or general}
purpose input. This input should be connected to VCC or
GND when not used.
I _{UART channel A Carrier-Detect (active low) or general}
purpose input. This input should be connected to VCC or
GND when not used.
I _{UART channel A Ring-Indicator (active low) or general}
purpose input. This input should be connected to VCC or
GND when not used.
O _{Output Port 2 Channel A - The output state is defined by}
the user and through the software setting of MCR[3].
INTA is set to the active mode and OP2A# output LOW
when MCR[3] is set to a logic 1. INTA is set to the three
state mode and OP2A# output HIGH when MCR[3] is set
to a logic 0. See MCR[3]. If INTA is used, this output
should not be used as a general output else it will disturb
the INTA output functionality.
O _{UART channel B Transmit Data or infrared encoder data.}
Standard transmit and receive interface is enabled when
MCR[6] = 0. In this mode, the TX signal will be HIGH dur-
ing reset or idle (no data). Infrared IrDA transmit and
receive interface is enabled when MCR[6] = 1. In the
Infrared mode, the inactive state (no data) for the Infrared
encoder/decoder interface is LOW. If it is not used, leave
it unconnected.
I _{UART channel B Receive Data or infrared receive data.}
Normal receive data input must idle HIGH. The infrared
receiver pulses typically idles at logic 0 but can be
inverted by software control prior going in to the decoder,
see MCR[6]. If this pin is not used, tie it to VCC or pull it
high via a 100k ohm resistor.
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