xr16m654 Exar Corporation, xr16m654 Datasheet - Page 9

• Manufacturer Part Number: xr16m654
• Description: 1.62v To 3.63v Quad Uart With 64-byte Fifo
• Manufacturer: Exar Corporation

REV. 1.0.0
Pin Description
ANCILLARY SIGNALS
CHCCLK
CLKSEL
DSRA#
DSRB#
DSRC#
DSRD#
16/68#
XTAL1
XTAL2
CDA#
CDB#
CDC#
CDD#
N
RIA#
RIB#
RIC#
RID#
AME
48-QFN
P
18
19
14
IN
-
-
-
-
-
-
-
-
-
-
-
-
-
-
#
64-LQFP
P
17
32
48
64
18
31
49
63
19
30
50
25
26
21
IN
1
-
-
#
68-PLCC
P
10
26
44
60
27
43
61
28
42
62
35
36
31
30
IN
9
8
-
#
80-LQFP
P
19
43
59
79
23
39
63
78
24
38
64
31
32
26
IN
3
-
-
#
100-QFP
9
P
1.62V TO 3.63V QUAD UART WITH 64-BYTE FIFO
IN
23
58
74
99
32
49
83
98
33
48
84
40
41
36
35
42
7
#
T
YPE
O
I
I
I
I
I
I
I
UART channels A-D Data-Set-Ready
(active low) or general purpose input. This
input should be connected to VCC when
not used. This input has no effect on the
UART.
UART channels A-D Carrier-Detect (active
low) or general purpose input. This input
should be connected to VCC when not
used. This input has no effect on the UART.
UART channels A-D Ring-Indicator (active
low) or general purpose input. This input
should be connected to VCC when not
used. This input has no effect on the UART.
Crystal or external clock input.
Crystal or buffered clock output.
Intel or Motorola Bus Select (input with
internal pull-up).
When 16/68# pin is HIGH, 16 or Intel Mode,
the device will operate in the Intel bus type
of interface.
When 16/68# pin is LOW, 68 or Motorola
mode, the device will operate in the Motor-
ola bus type of interface.
Motorola bus interface is not available on
the 64 pin package.
Baud-Rate-Generator Input Clock Pres-
caler Select for channels A-D. This input is
only sampled during power up or a reset.
Connect to VCC for divide by 1 (default)
and GND for divide by 4. MCR[7] can over-
ride the state of this pin following a reset or
initialization. See MCR bit-7 and
in the Baud Rate Generator section.
This input provides the clock for UART
channel C. An external 16X baud clock or
the crystal oscillator’s output, XTAL2, must
be connected to this pin for normal opera-
tion. This input may also be used with MIDI
(Musical Instrument Digital Interface) appli-
cations when an external MIDI clock is pro-
vided. This pin is only available in the 100-
pin QFP package.
D
ESCRIPTION
XR16M654/654D
Figure 7