XR68C681 Datasheet, PDF (47/75 Pages) Exar Corporation – CMOS Dual Channel UART (DUART)

XR68C681
 + ' '   (% ''%%$     '  .%
 (  ( %     (  (% %   & 
$ 22  &  H22  ,#82I
' $ ( 3$ (   '  .% ' $ -(%
+  & $  (  "    (  (
('& (   
Bit 7
Bit 6
Channel Mode
 J 8
 J  2' 
 J :' :
 J  :
Bit 5
Tx RTS
Control
 J 8
 J E%
Bit 4
CTS Enable
Tx
 J 8
 J E%
Bit 3
Bit 2
Bit 1
Bit Length
Bit 0
 J 6/1
 J /6
 J /<<
1 J @6
= J <1
6 J <@6
/ J 1<
@ J 
< J 6/1
 J /6
J /<<
* J @6

J <1
 J <@6
2 J 1<
J 
Table 18. The Bit Format for Mode Registers MR2A and MR2B
MR1n[7] - Receiver Request to Send Control
$( (&"  C%   $ (% %%$  -$
& ( 3( -   H2 , , *#
 8I
 H
:2  , , *#
 8I (  
(   9" (+  M@N J  (% %"  
  '( (  '     -( +  
  '(+('&" %( -  (% ( (   
'(  -  (+ (% 9 (% +  (% H+
' I ' (C (% %+ (  ( - '( 
%
Figure 24 % %  $(-  (' (%%  
'(' $ C%  % $ ' +(-( $
+ '( 
MR1n[6] - Receiver Interrupt Select
 (% ( %'% (    5E %% (    ::
%% ( +   '     %$ %   '(( +
- ( -  (  C%   
," #MN +
'    $ #M6N + '   *
MR1n[5] - Error Mode Select
 (% ( ' %   ( +     #  %% (%
,2" 2" '($ *3 +  
  #+  (% ( (% %
 HI"  (% (' '   (  (  
H
'I  $ #+  (% (% (% %  HI"  (%
(' '   (  (   H*'3I  $
#   ' ' $  % %% (% &  &   
' '   (% ' &     +   #  #  
'3 $"  % (% %    '( -('
 +   %% +  ' '% '( -     +  
#  %( '   % H22 2  I ' $
+   '   % (%%$
MR1n[4:3] - Parity Mode Select
#+ HA#9 , #EI  H 
2 , #EI ( (%
-$"  (& ( (% $$$     %($
' '%  $   '( +%  (& ' '3 
'($ ' '%  Section H.2 + $%'(( +
( $ ( 
 
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