XR82C684CJ-F Datasheet, PDF (18/107 Pages) Exar Corporation – CMOS Quad Channel UART(QUART)

XR82C684
Table 1 ( ('%   ' '   (% I( 3( 3
  ,(%% %% '( 3( ' *  %  
,(% (% (%  /  ,(%1  (     ( 
 ' (-%&%  3   55 '   (  (%
/ ( ( ,  1   '    ,(% Please note that
the suffix “n” is used at the end of many of the QUART
registers symbols in order to refer, generically, to any one
of the four channels ; 3#   '  % *   
 (  3( % (* *    %% *    ,(% 
  *    ,(%# ((& *  3( ,  & 
 E( ''%%     ,(%     (  3(
' (   / (   1    ,(%  (  3
% ''%   (  /55  +$:51 '  
%  (  6   /55  +$:51
'   '  (%% & 3(( ,    (  
   ( '  K%
  ,(%
 * #     ,(%%# 3( (  ,( '  #
   %  ,(' %%   *%  
* '( % *        '   &    
,(%%  (%'%% ( ( ( Section G.3
B.2 Command Decoding
5' '   (% I( 3( 
  ,(% $
, #     *  %
  ,(%%  
 -(%    %(#  -(%  
'(#  , 3( *'((( ,  %(% *  
(%'  % '     ' (  '  %  
( *  *  '
  ,(% (% %   3
CRA, CRB, CRC, CRD
Bit 7
Bit 6
Bit 5
Miscellaneous Commands
   3( , "
Bit 4
Bit 3
Bit 2
Enable/Disable Receiver
 L :
 ,
 L 5  "
 L !(% "
 L :  (   %
Bit 1
Bit 0
Enable/Disable Transmitter
 L :
 ,
 L 5  "
 L !(% "
 L :  >( !  %
  * '( *    3 ( *  
 
,(%% (% *(& %(, * 3  (% ( (% % 
(     (%    %(  -  '(
   ( *  
  ,(% (% % 
(  6  %(% * (%'  % '  % Table 2
*( %   '  % %% '( 3(    ( *
 
  ,(%% Please note that the upper nibble
commands 116 through B effects only the performance of
Command Register’s Channel. However, commands C
and D effects system (or chip) level operation.
Bit 7






Bit 6






Bit 5






Bit 4






Description
Null Command:
Reset MRn Pointer:
%%  
 K%   (    (    
Reset Receiver: %   ( (( '   '( % (*  ;3 % %
 (   '( (% (%     $ (% *% 
Reset Transmitter: %%   ( (( '    %( % (*  ;3
%   (   8!  (% * '   (, 
Reset Error Status:
%   '( )6 )# +(& 5  +5# ( ,
5  5    5  5 %% (%# PB74Q
'(*('&# (*   5   # *   (' '   (% %  /) '61 5   #
 (% '   3( %  *   '( 5  $ (' % (   % ,(% $
  ) '6 5   # ' (   +5# 5# 5#  ) ''%#     3( ' 
(    *,, (   % ,(%#  (  (% '   (% (%%
$*   5   # *   (' '   (% %  /
' 5   1#    
'  % *   % ,(% *  +5# 5#   )  *'  ' ' &
' ' %(% $   /
' 5   1#   % *  % ( (' % (%
% &    ' '   (%      *   ;
: 7   5 ( ('  (% 3&% %  %  /) '6 5   1 ( (' #  
I(%  (% '     %
Reset Break Change Interrupt:
%   '  K% 6 '  , (  %%
(# 3( (    ( $  % ,(%
 
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