XR28V384IM48-0A Datasheet, PDF (4/42 Pages) Exar Corporation – 3.3V QUAD LPC UART WITH 128-BYTE FIFO

XR28V384
REV. 1.0.0
Pin Description
3.3V QUAD LPC UART WITH 128-BYTE FIFO
NAME
48-TQFP
PIN#
TYPE
DESCRIPTION
RTSC# /
PS_CONF_KEY0/ ²³
RS485
UART Channel C Request-to-Send (active low) or general purpose output or
Automatic RS485 Half-Duplex control pin. See ’Section 1.4.4, Auto RS-485
O Half-Duplex Control’.
This pin has an internal pull-up resistor and is sampled upon power-up or reset.
See Table 1 ’UART Power On Configuration’.
DTRC# /
PS_WDT
UART Channel C Data-Terminal-Ready (active low) or general purpose output.
24
O ^{This pin has an internal pull-up resistor and is sampled upon power-up or reset.}
The registers can later be modified by the software. See Table 1 ’UART Power
On Configuration’.
RXC
25
I
UART Channel C Receive data. Normal receive data input must idle at logic 1
condition. This input should be connected to VCC or GND when not used.
TXC /
26
PS_3E8_IRQC
UART Channel C Transmit Data. The TXC signal will be a logic 1 during reset or
idle (no data). If it is not used, leave it unconnected.
O _{This pin has an internal pull-up resistor and is sampled upon power-up or reset.}
This will determine the default register settings for UART channel C. The regis-
ters can later be modified by the software. See Table 1 ’UART Power On Con-
figuration’.
CDC#
27
I
UART Channel C Carrier-Detect (active low) or general purpose input. This input
should be connected to VCC or GND when not used.
RIC#
28
I
UART Channel C Ring-Indicator (active low) or general purpose input. This input
should be connected to VCC or GND when not used.
CTSB#
31
I
UART Channel B Clear-to-Send (active low) or general purpose input. This input
should be connected to VCC or GND when not used.
DSRB#
32
I
UART Channel B Data-Set-Ready (active low) or general purpose input. This
input should be connected to VCC or GND when not used.
RTSB# /
PS_CONF_KEY1/ ³³
RS485
UART Channel B Request-to-Send (active low) or general purpose output or aut-
matic RS485 Half-Duplex control pin. See ’Section 1.4.4, Auto RS-485 Half-
O Duplex Control’.
This pin has an internal pull-up resistor and is sampled upon power-up or reset
See Table 1 ’UART Power On Configuration’.
DTRB# /
34
PS_2E0_IRQB
UART Channel B Data-Terminal-Ready (active low) or general purpose output.
This pin has an internal pull-up resistor and is sampled upon power-up or reset.
O This will determine the default register settings for UART channel B. The regis-
ters can later be modified by the software. See Table 1 ’UART Power On Con-
figuration’.
RXB
35
I
UART Channel B Receive data. Normal receive data input must idle at logic 1
condition. This input should be connected to VCC or GND when not used.
TXB /
36
PS_2F8_IRQB
UART Channel B Transmit Data. The TXB signal will be a logic 1 during reset or
idle (no data). If it is not used, leave it unconnected.
O ^{This pin has an internal pull-up resistor and is sampled upon power-up or reset.}
This will determine the default register settings for UART Channel B. The regis-
ters can later be modified by the software. See Table 1 ’UART Power On Con-
figuration’.
CDB#
37
I
UART Channel B Carrier-Detect (active low) or general purpose input. This input
should be connected to VCC or GND when not used.
4