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XR88C681CP Datasheet(PDF) 19 Page - Exar Corporation

Part # XR88C681CP
Description  CMOS DUAL CHANNEL UART (DUART)
Download  99 Pages
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XR88C681CP Datasheet(HTML) 19 Page - Exar Corporation

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XR88C681

  
 B(  -(' CD  #N>O
ISR[6] Delta Break Indicator - Channel B
B (% ( (% % " ( ($(' %     *
 ' (  % $  ' $   -((-  $ +   ' ( $
 3 * (% ( (% '  $   %    ,
(3 %  '  * C22 *2: 8702
#72 ,D '$ % Table 3
 
(+( (   H%  %%   *2:
'$(("  % % Section G.2
ISR[5] RXRDY/FFULL B - Channel B Receiver Ready
or FIFO Full
 +'( + (% ( (% %  ' $ & -(-
*N/O
#+ - $ %   ' (   $&
($(' 5G*" ( ($(' %    % 
''  + $ (% ( 8* $ (%  $&    $ & 
,  (% ( (% %    ''  (% %+  $ +
  ' (  %(+  -(%   8* $ (% '  $ 
 ,  $%  8* #+    %( 
'' % ( 8* +    $  ("  ( ( 
%  -( +  8* (% C $D
#+ (% ( (% - $ % #  + ($('  99*"
( (% %    ''  (% %+  $ +   
8* $  %+  '% % 8*   ' + (%
( (% '  $   ,  $% 8*L $   &
C(-D  # " 3(-  +  ! ''  #+
 ''  (% ((- (    '% 8* (% +"
(% ( (  %  -( +    $  ("  
''  (% $ $ ( 8*
Note:
If this bit is configured to reflect the FFULLB indicator, this
bit will not be set (nor will produce an interrupt request) if
one or two characters are still remaining in RHRB, following
data reception. Hence, it is possible that the last two char-
acters in a string of data (being received) could be lost due
to this phenomenon.
ISR[4] TXRDYB - Channel B Transmitter Ready
(% ( (%  $(' + 5G *" *NO
(% ("  % " ($(' %  8* (% & $ (%
 $&  ''   ''  +  ,   ( (%
'  $   , ( %   ''   8*L
$ (% %  -("   ''  (% %+  $  
 5G* (% %    %(  (% (((&
 $ $ (% '  $   %(  (% $(% $
' % $ $ ( 8* (  %(  (%
$(% $ (   %( $
ISR[3] Counter Ready
#  #2 $ "  .  .(  ( % 
#N1O ' ' '&' +   % %E 
(   ,1 ( #N1O (  '  $ &
(3(-  C,  72D '$ *  ( ($"
 (  #2 $ "  C,  72D
'$ (  %  .
#   72 $ " (% ( (% %    ' 
 ' %   ( ' / $ (% '  $ 
 '  (% % $ &  C,  72D
'$ B   .(  (% (   72
$ "  C,  72D '$ ( % 
 .( 
ISR[2]: Delta Break A - Channel A Change in Break
%% ( + (% ( ($(' %   '  ' ( 
% $  ' $   -((- +   $ +   ' ( $
 3 * (% ( (% '  $   , (3 % 
' C22 *2: 8702 #72 ,D
'$
  (+( (   H%
 %%   *2: '$(("  % % Section G.2
ISR[1] RXRDYA/FFULL A - Channel A Receiver
Ready or FIFO Full
 +'( + (% ( (% %  ' $ & -(-
N/O
#+ - $ %   ' (   $&
($(' 5G" (% ( ($(' %    (%   %
 ''  + $ ( 8" $ (%  $&    $ &
 ,  (% ( (% %    ''  (% %+  $
+    8 $ (% '  $   ,
 $%  C%D 8 #+    %(  '' %
( 8" +(-   $  ("  ( (  % 
-( +  8 (% C $D
#+ (% ( (% - $ %  #  8 + ($('
 99" ( (% %    ''  (% %+  $ +
   8 $  & %+  $ '' 
'% % 8   ' + (% ( (% '  $  
,  $% 8 #+  ''  (% ((- (  
 '% 8 (% +" (% ( (  %  -(" +(-
  $  ("   ''  (% $ $ (
8
Note:
If this bit is configured to reflect the FFULLA indicator, this
bit will not be set (nor will produce an interrupt request) if


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