XR68C681J View Datasheet(PDF) - Exar Corporation

Part Name

Description

MFG CO.

XR68C681J

CMOS Dual Channel UART(DUART)

Exar Corporation 

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XR68C681

Table 1 ($('%   ' '  (% C($ ( 

H$ -(%%I %%'($ ( ' +  % H$

-(%I (% (%  H$ -(%I (   (

 ' (.%&%    22 '  ( (%

H((- I   '   -(% ,%   

  %++(! HI (% %$    $ + & +  % -(%

%&% ( $  +" -('&"  (  ' %

 * 9"   '% +    ( ( % (+

+   $$%% +    -(%    +   

-(%" ($(& +(- & $  ( ''%% 

   -(%    ( ( '(  H(

I    -(% (  $ % ''% 

(  H22  ,#82I '$ % 

(3$   H22  ,#82I '$ ' 

(%%$ & ((-   ( $    (

' .% '$ -(%  +"  $

-(%%" ( (  -( ' "    % -('

$$%%   +% $ +'(% +     

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

$( ( Section G.3

B.2 COMMAND DECODING

2' '  (% C($ (  '$ -(% #

-"    +  % '$ -(%%  

.$(%   %(" .$(%  

'(" - ( +'(((-  %(% +  

(%'% '$%   ( + + '

'$ -(% (% %$ 

Bit 7

Bit 6

Bit 5

Miscellaneous Commands

 (- !

Bit 4

Bit 3

Bit 2

Enable/Disable Transmitter

 J 8
-

 J 2 !

 J (% !

 J 8 ;($

  %

Bit 1

Bit 0

Enable/Disable Receiver

 J 8
-

 J 2 !

 J (% !

 J 8 ($

$  %

Table 2. Command Register - CRA, CRB

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

$(%   %( $. '(

   ( +   '$ -(% (% %$  (3  %(% + (%'% '$% Table 3

$+(%   '$% %%'($ (    ( +   '$ -(%% ,%       (

'$% /  - */ ++'% &   +' + '$ -(%.% '  9" '$%
/

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

 

=

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