xr16m890 Exar Corporation, xr16m890 Datasheet - Page 7

• Manufacturer Part Number: xr16m890
• Description: Uart With 128-byte Fifo And Integrated Level Shifters
• Manufacturer: Exar Corporation

REV. P1.1.1
Pin Description
DTR#/GPIO0
DSR#/GPIO1
MODEM I/O and GPIOs
ANCILLARY SIGNALS
CD#/GPIO2
RI#/GPIO3
GPIO10
GPIO12
GPIO13
GPIO14
GPIO15
GPIO11
GPIO4
GPIO5
GPIO6
GPIO7
GPIO8
GPIO9
XTAL1
XTAL2
N
RTS#
CTS#
INT
TX
RX
AME
QFN-32
P
10
17
18
19
16
24
23
22
21
26
27
IN
-
-
-
-
-
-
-
-
-
-
-
-
#
QFN-40
PIN#
12
32
33
31
30
29
28
27
26
23
22
21
20
35
36
-
-
-
-
-
-
-
-
TQFP-48
PIN#
15
40
41
39
38
37
36
35
34
28
27
26
25
19
20
21
22
23
29
30
31
43
44
UART WITH 128-BYTE FIFO AND INTEGRATED LEVEL SHIFTERS
T
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
YPE
O
O
O
O
I
I
I
Interrupt output (active high). The output state is defined by the user
through the software setting of MCR[3]. INT is set to the active
mode when MCR[3] is set to a logic 1. INT is set to the three state
mode when MCR[3] is set to a logic 0. See MCR[3].
UART 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 a logic 1 during 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 a logic 0. If it is not used, leave it
unconnected.
UART Receive Data or infrared receive data. Normal receive data
input must idle at logic 1 condition. The infrared receiver idles at
logic 0. This input should be connected to VCC when not used.
UART Request-to-Send (active low) or general purpose output. This
output must be asserted prior to using Auto RTS HW flow control,
see EFR[6], MCR[1] and IER[6]. This output can also be used for
the Auto RS-485 half-duplex output control.
UART Clear-to-Send (active low) or general purpose input. It can
be used for auto CTS flow control, see EFR[7], MSR[4] and IER[7].
This input should be connected to VCC when not used.
General purpose I/O or UART Data-Terminal-Ready (active low).
General purpose I/O or UART Data-Set-Ready (active low).
General purpose I/O or UART Carrier-Detect (active low).
General purpose I/O or UART Ring-Indicator (active low).
General purpose I/Os.
These GPIOs are only available on the QFN-40 and TQFP-48 pack-
ages.
General purpose I/Os.
These GPIOs are only available on the TQFP-48 package.
Crystal or external clock input. Note: This input is not 5V tolerant.
Crystal or buffered clock output.
PRELIMINARY
7
D
ESCRIPTION
XR16M890