XR68C681CP View Datasheet(PDF) - Exar Corporation
Part Name
Description
MFG CO.
'XR68C681CP' PDF : 75 Pages View PDF
XR68C681
, % Table 6 '% + % % '(+&
+ (- %4
M@N % %(-(+(' ( * + !(
( & -(%
5 2! $ (
M@N (% * + !(( & ' -(% " $
' %(& - $ & ((- !!!!!!!
!!!!!!! " ( $ % ' "
% '( &
(Note: the b suffix denotes a binary expression. x = don’t care
value).
5 ' 2! $ (
2' %( $ ' ( " ( ( %
! $ ( ' % ' $ & ((-
( $ ' .% ' $ -(%
- (% (+ ( ' + $ ( Table 1
Table 10 % (G % % ' $%" $ ( ++ '
! $ (%
Register
$ -(% "
$ -(% "
$ -(% *" *
$ -(% *" *
Contents
</
/
/
*/
Resulting Action
! *0 ' 2! $ *( 5 J
! *0 ' 2! $ *( 5 J
! *0 ' 2! $ *( 5 J
! *0 ' 2! $ *( 5 J
Table 10. Command Register Control Over the Extend Bit
Note: if the user programs either nibble of the Clock
Select Register (CSRn[7:4] or CSRn[3:0]) with values
ranging from 016 to C16, then the user is using the BRG as
a source for timing. However, these standard bit rates
(presented in Table 9) apply only if the X1/CLK pin is
driven with a 3.6864 MHz signal. If a signal with a different
frequency (fo) is applied to the X1/CLK pin, then the
DUART channel is running at the following baud rate:
Actual Baud Rate =
MTable Baud Rate ValueN • fo
1/</= MHz
provided that fo is between 2.0 MHz and 4.0 MHz.
$$(( &" % ( '% + %$ $ $ %"
' + C '& + ' '3 %(- ( / ( % %
%
1X vs 16X Clock Signals
% H5 '3I $ H/5 '3I ( $
- (% ! + " ( (% ( $(%'%%
( (- $ %(-(+('' H/5 '3I
% % ' ( $ % ( $ & +' + /
A % H5 '3I & % % %(-% '
( ( $ (%" % $ ' '& ' '$
- '' '& ( % ' ( $ (
% + /5 ' '3 ( ( + 5 ' '3
+ (- - % ( ' (+& % %
' ( ( + ' % (% ' '3 $ &
' ((- % ' + ((- ' '3 #+ (%
' ( (% '( $ (% ' ((- $ +
% ( %( " %( (% % ' '3 $ & (%
' ((- % ' 9 ' " (% -
' '3 + C '& + ' ( (% !'&
% % + %( (% (%
' ' (%(' + %&' % % ( $
' ('( - ' ( $
%( - $ ' ( $
%( $ !'& % $ " %++('(
$(++ ' % ( + C '( % + ' '3 % ' %
' ' ( $ %( ' ' (
( % ( ' ((- ' %%" % % $ (
+ (- $(%'%%(
% % ( $ %(%%( %&%
% $ (' $ ( Figure 10 (% %&% ' %(%% +
%( 5" $ ' ' ( 5
1
Share Link: 
