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XR88C681CP Datasheet, PDF (13/99 Pages) Exar Corporation – CMOS DUAL CHANNEL UART (DUART)
XR88C681
.B
2 ''3
22
B

22
Figure 2. External Logic Circuitry required to interface a 6800 Family
Processor to the XR88C681 Device
B.1 DUART Register Addressing
 $$ %%( - +  (     -(% % +    (%  %  $ ( Table 1 Please note that some of the
registers are “Read Only” and others are “Write Only”. 2' '   (% ($ $ (  +( - $ $(' $
$$ %%   -(% %
  $  -(% %
 $  -(% %   $ 
 %  -(% %
 '3   '  -(% %
  ' (  8$( -  -(%  8  $  %( 8$( -  -(%  8
$$(( &"    ' ( %  +( -  -(% %   %.'   '  %
 #   %  -(% 
 #   %3  -(% 
 %3 $ #   %  -(% 
 #   ; '  -(% 
 !((&    -(% 
$ +( &"    % ' ( %    -(% %   % + '( %     % ( $ ' ('( " %'
%    %  $  '  %.( %
 ,  ,    -(% 
 #,  #  ,  +(-(  -(% 
      .(    *&  -(% 
 9    .(  9  *&  -(% 
  
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