English
Language : 

XR88C681CP Datasheet, PDF (85/99 Pages) Exar Corporation – CMOS DUAL CHANNEL UART (DUART)
XR88C681
$$ %% *& "   " (  %  C %D %  
' ' !(   ' ( $ &   % (+ ( 
( $(($ % $ ('  (%  ( - $$ %% $   ' ( 
+  $$ %% $ % (   $  $ (   +
 ' ( +  $ & %   +%  % %  
   $$ %% $ (   %  (  ' ( % $(% $"
 $ ( ' (   (-   $ & %   +%
 & (  (   $ -(   ! $$ %% &
(%  %( $ &  C%   (' D
H.2.2 DUART Multi-Drop Operation
-( '  " ( (    (% - $ ( 
 ( $ & % ( -  N<41O J C" D #  (%
$ "   %( $ ' '  ' %(%% +    ("
 - $   + $ (%"  $$ %%.
 . +- (L  $  - $ , (  -  .
J  ( $(' %    ' '  (% $"  ( . J 
($ (+( % ( %  $$ %%
Transmitter Operation During Multi-Drop Mode
 % ., ' %  % +   %( $
' '  & -( -  NO +  '   (
 $( -  $ (% (   8  ( -  NO J
CD  %% ( . J CD  $ % ( -  NO J CD  %% (
. J CD Figure 48  % %  ' $ + $(-
+  %(( - ' ' %  $$ %%  "  ( ( 
( $ 
 
# 3  C22 
,#72D ' $
B( !  (
 $  -(% 
  . *(  CD
B( !!!!!!!  
 -(% 
  . *(  CD
B( !!!!!!! 
  -(% 
 %( $$ %%
 '     (' 
B(  '   8 
# 3  C22 
,#72D ' $
B( !  (
 $  -(% 
 %(   ' 
   (' 
B(  '   8 
   
  ' %
G %
 B(  '(
  (' T
7
  
Figure 48. A Flow Diargam Depicting a Procedure That Can Be Used to
Transmit Characters in the Multi-Drop Mode
=6