XR68C681J View Datasheet(PDF) - Exar Corporation

Part Name

Description

MFG CO.

XR68C681J

CMOS Dual Channel UART(DUART)

Exar Corporation 

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XR68C681

Bit 7

































Bit 6

































Bit 5

































Bit 4

































Description

Null Command:

Reset MRn Pointer:
%%   ' .%  (  (  

Reset Receiver: %%   ($(($ '  '( % (+  $ % %

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

Reset Transmitte4 %%   ($(($ '  %( % (+  $ %

$  ($   5  (% +'$   (- 

Reset Error Status:
%   '($ *3 *" ,(& 2 ,2" (-

2  2 $  2 2 %% (%" M@41N

'(+('&" (+    $" +  (' '  (% %  H*'3I  $"

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

#   '3  $" ' (   ,2" 2" 2  * ''%"  (%  ( '

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

#+   2 $" +  (' '  (% %  H
'I 2 $"    

'% +   % -(% + ,2" 2 $ *  +'$   ' ' &

' ' %(' #   H
'I 2 $"   % +  % ($('% (%

%$ &    ' '   (%     +   9

  2 ($(' (% &% +--$ %  H*'3I 2 $ ($('" $ C(%

 (% '$   %

Reset Break Change Interrupt:
%   ' .% 3 ' - ( %%

(

Start Break: '%   5     %( %  $  %

 3 #+   %( (% &"   % +   3 &  $&$   

( (% #+   %( (% '("   3 -(%     %(%%( +

 % ' '% (   9 (% '$" (G" 52, %   +  

3 ( -(

Stop Break:   5 ( ( - (- ( (  ( (% 5 ( ( (-

+  ( ( +   ! ' '" (+ &" (% %($

Set Rx BRG Select Extend Bit: %   ' .% H'( *0 ' 2!$

*(I  HI - !J

Clear Rx BRG Select Extend Bit:
%   ' .% H'( *0 '

2!$ *(I - !J

Set Tx BRG Select Extend Bit: %   ' .% H%( *0 ' 2!

$ *(I  HI

Clear Tx BRG Select Extend Bit:
%     ' .% H%( *0 

' 2!$ *(I  HI

Set Standby Mode (Channel A): A   (% '$ (% (3$ (   ' 

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

.( $ $$(( '('(%  '    (   %$&  

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

' ( 8 ( (% %$ &  $ %  & (3(-   H2


#;2 2I '$

Set Active Mode (Channel A): A   (% '$ (% (3$ (   ' 

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

 (

Reserved

Reserved

Table 3. Miscellaneous Commands, Upper Nibble of all Command Registers, Unless Otherwise Specified.

 

6

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