XR68C681J View Datasheet(PDF) - Exar Corporation

Part Name

Description

MFG CO.

XR68C681J

CMOS Dual Channel UART(DUART)

Exar Corporation 

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XR68C681

ISR[3] Counter Ready

#   #2 $"  
. 
.( ( %

#M1N ' ' '&' +   % %C 

(    ,1 ( #M1N (  '$ &

(3(-   H,
82I '$ * ( ($"

  (   #2 $"   H,
82I

'$ (  %  
.

#  
82 $"  (% ( (% %    
.

' %   ( ' / $ (% '$  

 
. (% %$ &  H,
82I '$

A   
.( (% (  
82 $"  (%

'$ ( %   '

ISR[2]: Delta Break Indicator - Channel A

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

% $'$   -((-  $ +  '($ *3

*  (% ( (% '$    
, (3%  ' 

H22 *27
9802 #82,I '$

  (+( (   .% %%  

*27 '$((" % % Section G.2

ISR[1] RXRDYA/FFULLA - Channel A Receiver

Ready or FIFO Full

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

M/N #+ -$ %   '( $&

($(' 5E"  (% ( ($('%     (%  %

 ' ' + $ ( 9" $ (% $&   $ &

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

+     9 $ (% '$    
,

$%  H%I 9 #+    %(  ' '%

( 9 +   $ ("   ( (  % -(

+ 9 (% H$I

#+  (% ( (% -$ %   #  9 + ($('

 ::" ( (% %    ' ' (% %+$ +

    9 $   & %+$ ' '

'%% 9  ' + # (% '$    
,

$% 9 #+  ' ' (% ((- (    '%

9 (% +"  (% ( (  % -( +   $

("     ' ' (% $$ ( 9

ISR[0]: Channel A Transmitter Ready

 (% ("   %" ($('%   9 (% & $ (%

$&  ''  ' ' +  
,   ( (%

'$    
, (%   ' '  9K

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

 5E (% %     %( (% (((&

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

'% $$ ( 9  (   %( (%

$(%$ (   %($

C.2 Interrupt Mask Register (IMR)

  ( %3 -(% (%  HA( &I -(%

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

'%     (%%  ( C%   

'%% #   $%"   % %   ( +

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

  (%%  ( C%  +"  

(+ +   # (% %%(&   % %   #

9" + '%%"   ( + +   # (%

%$ (   +(- 

Bit 7

Input Port

Change

 J ++

 J 

Bit 6

Delta Break

B

 J ++

 J 

Bit 5

RXRDY/

FFULLB

 J ++

 J 

Bit 4

TXRDYB

 J ++

 J 

Bit 3

Counter

Ready

 J ++

 J 

Bit 2

Delta Break

A

 J ++

 J 

Bit 1

RXRDY/

FFULLA

 J ++

 J 

Bit 0

TXRDYA

 J ++

 J 

Table 6. IMR Bit Format

 

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