XR68C681 View Datasheet(PDF) - Exar Corporation

Part Name

Description

MFG CO.

XR68C681

CMOS Dual Channel UART(DUART)

Exar Corporation 

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XR68C681

Example B: Programming the Bit Rate via the

Counter/Timer

%   % (% %  %( $ '( $ 

/63% ( '  * ,%     (% ('

(  (%  ++$ &   *0 #  (% '%   % '

$   +(-

 (  = 9G : %(- (   5.
:7 ("  (

  5 ( (% + +(-

 A( / 
 $ / 
:

 (% %% %% (  
. -(-  %C 

+ +C'& J = 9G.MN J  9G

1 A(  
M/4=N

 (% ( %  
. (   ( $" $ %'  

((- %' +  
.     5.
:7 (

= A( / 
*

 (% ( %'(+&     ((- %' +   '(

$ %( + '  * (  $($ +  

. ,%         (%

-$ (  (% '+(-("  
. 

%%  /5  % +   %($ $

'($ $  +"   ' ( '('(& ( $(($

   9G %C  & /" L% (3 + ''3 %(-%

(-((- +   *0

 %4 *(  J  9G./ J /63%

Example C: Using the External Input Ports

%  " ( $$((  (- '  * 

/63% % 2! *" .%  %  %( $

'( $  % ( '  

  % $%  +  +   %% %$ (

2! *" - (   +(-4

 A( !!!!!!    ,
  ,

+(-( -(%

 (% % %    9G %C  +  
. 

   ,1

 2!& ''   ,1 (    #,1 $ #,= (%

 & &(-   9G %C  (  %

 ( (%

1 A( / 


 (% % ( %'(+&     ((- %' +  

%( $ '( + '  (  $($

+ ( (% #,1 $ #,=" %'(& $$((&"

 (% %     $  %  

 % ( %(-  5 %(-% 9'"   (% 

$((%(&/ +  (% %(-  +"   (  +

'  (%  %

,%    (+   %   &  (% !"

.%  $  %%( + %(-    

('(- %( $ % (% %&' % (   

9G 5 ''3 %(-K ( $  (((G ( %

 

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