XR68C681CP View Datasheet(PDF) - Exar Corporation

Part Name

Description

MFG CO.

XR68C681CP

CMOS Dual Channel UART(DUART)

Exar Corporation 

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XR68C681

Bit 7

Input Port

Change

 J 8

 J E%

Bit 6

Delta Break

B

 J 8

 J E%

Bit 5

RXRDY/

FFULLB

 J 8

 J E%

Bit 4

TXRDYB

 J 8

 J E%

Bit 3

Counter

Ready

 J 8

 J E%

Bit 2

Delta Break

A

 J 8

 J E%

Bit 1

RXRDY/

FFULLA

 J 8

 J E%

Table 5. Interrupt Status Register - (ISR) Bit Format

Bit 0

TXRDYA

 J 8

 J E%

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

ISR[7]: Input Port Change of State:

#+  (% ( (%   -(' HI"    H' - + %I %

$'$    #,  #,1 (%   % $ %('  (%

( & $(-   #,
 (+ #M@N J  #M@N (%

'$    
, % $   #,
 *& $(-  

#,
"   % ( $(4

   ($(($ # , (   ' -$ %

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

 
- + 

  $($ $%'(( +   #,
" % %

Section E

,%    ( $    (% ( '$(("

  % % $   (-%4

 A(   ( $     ( +  

!((&
 -(%"
M14N #  (% %"  

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

H# ,
-I ( C%

 A(  -(' HI  #M@N

ISR[6] Delta Break Indicator - Channel B:

A   (% ( (% %" ( ($('%     '  * '(

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

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

'  * H22 *27
9802 #82,I

'$   (+( (   .%

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

ISR[5] RXRDYB/FFULLB - Channel B Receiver

Ready or FIFO Full

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

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

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

' ' + $ (% (   9* $ (% $&   $ &

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

+   '($ % (+ -(%  9* $ (% '$

   
, $% 9* #+    %( 

' '% ( 9* +   $ ("   ( ( 

% -( + 9* (% H$I

#+  (% ( (% -$ % #   ($('  ::*"

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

9* $   %+ '%% 9*  ' +  (%

( (% '$    
, $% 9*K $  &

H(-I   # " 3(-  +   ! ' ' #+

 ' ' (% ((- (    '% 9* (% +"

 (% ( (  % -( +   $ ("    

' ' (% $$ ( 9*

ISR[4] TXRDYB - Channel B Transmitter Ready

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

$&  ''  ' ' +  
,   ( (%

'$    
, (%   ' '  9*K

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

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

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

'% $$ ( 9*  (   %( (%

$(%$ (   %($

 

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