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XR88C681CP Datasheet, PDF (76/99 Pages) Exar Corporation – CMOS DUAL CHANNEL UART (DUART)
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XR88C681
MR2n[3:0] - Stop Bit Length
 (% ( +( $ -%  $( +  % (%
 $ $  '  %( $ ' '   (
$( + ./   ( (  $  ./   ( ( %" (
( '  % + ./ (% '  - $ + ' ' 
 - % + /" >  $ = (%   6 ( ' ' "  % (
$( '  - $ + ./   ( ( %
#+  !   ! ''3 (% - $ +   %( 
''3 5 "  N1O J  %  '%  % ( $( +
 ( (  $  N1O J  %  '%  $( +  (
( % +  %(%%( 
  ' (   & ' '3% + 3 ' $((   '  
+  +(% % (   (%"  ( ( +   % $ 
(& ( (% % $  -$ %% +  - $
 %( $ % (  -  #+   ' (  $ %  %
 C3D  C  2D  2 (% +-- $ (  %
 -(% 
Bit 7
Received
Break
 J 7
 J G %
Bit 6
Bit 5
Framing Error Parity Error
 J 7
 J G %
 J 7
 J G %
Bit 4
Overrun
Error
 J 7
 J G %
G.4 Status Register, SRn
 %  -(%  ($ %  %  ( %%  
8  $ 8  ' (   $  %(  # %"
 % '( &L  $ %  %  ($  , ( 
 % +  E(& +   ' ( + $ & 
 ' (  #  % ( $('%  % + (  $
%&% %  $ %  ,  ' '3  $ % (+ 
 %(  (% &  $. (%  $& + $ + 
,   #  % ( $('% % ( $('    
  8 %  ' ' "  (' (% (( -    $
&  , "  (% +  $ ( ' +  ' (( -  & 
' ' % (        %(   $
 ' (  #  %% ( $('%  ' $ (   
( +  %  -(% 
   ( +  %  -(%   %  %  +
 & $  ' ( %  (+ +  %
 -(%   $  $(%'%%( + ' ( +%4
Bit 3
TXEMT
Bit 2
TXRDY
Bit 1
FFULL
Bit 0
RXRDY
 J 7
 J G %
 J 7
 J G %
 J 7
 J G %
 J 7
 J G %
Table 28. Status Register - SRA, SRB
SRn[7] Received Break
 (% ( ( $(' %     I  ' '  + 
- $ ' '   - %  ' ( $ (  
% (  &  %( - #  %(( (% ''( $  
 3 (%  ' ( $ $$((   %+ % (   #  
( (( $  (  5 (   %   3( - % +
  % +  ( (   (% (% $ +( $ %  %'' %%(
$- % +  (     !   ! ''3
B  (% ( (% % "  '  H% C8 702 #7 *2 :
  D ( (  # (% %   ( (  # (% % % 
  $ +   3 ' $(( " % $ +( $  " (%
$  ' $
 ' (H%  3 $  ' -(' ' $  '  3%    -(
(  ($$ +  ' '  8  "   3 %
 %(%  (  $ +  ! ' '  ( ( $  + (
  $  ' $
#+  2 $ " +  '  " %  %  
C ' D $ "  (% (  & ( %    '  
  +  8  (% ( (  '  $ (+  5
(  (% -    -(' C (- D   " (  !
' ' 
#+  C2D $ %  %   C*'3D $ "   (%
("  ' %  (  ( %%  $  (  C22
2   D ' $ %  ( 3 $  %
% Table 3 Please note that if the Error Mode is “Block”
this bit, in the Status Register will remain set, for all
subsequent characters, independent of the condition of
these received characters, until the “RESET ERROR
STATUS” command has been invoked.
SRn[6] Framing Error
( -  ' ( +  ' '  (%"  $  &
%%'( $ (& ("   ' (  ( ' '3 +  C3D
' $((  (( +( -  % $  (& (
 (% C3D ' $(( (%  , ( #+   ' ( 
$ %  $  '  C3D   (% ( "  ( (% -- $
C (- D +--( -  '' ' +   2  2
#+  2 $ %  %   C ' D $ "  (%
(  & ( %    '     +  8 #+
  
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