XR68C681 View Datasheet(PDF) - Exar Corporation

Part Name

Description

MFG CO.

XR68C681

CMOS Dual Channel UART(DUART)

Exar Corporation 

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XR68C681

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Figure 27. An Illustration Depicting the Concept of Multi-Drop Mode

:*

* .

< *(
'

$$%%. *(

Figure 28. Bit Format of Character Data Being Transmitted in

the Multi-Drop Mode

  H% (I '('%    H

(%I & %((-  ' ' &('&  & (

 H$$%%.I ( +- $$    $ +  

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

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

Figure 28

A    H% (I %  %(  '3 +

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

&   ($(+(%   H- I $$%% &

$(++% +  $ & (     ( ( (%  HI ( 

$$%% & $  HI (  $ &

$$%% &" " (%  H%I %  

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

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

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

'( +   $ &%   +%   %%  

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

$ ( '(  (-   $ &%   +%

 & (  ($ -(     ! $$%% &

(% %($ &   H% ('I

H.2.2 DUART Multi-Drop Operation

-( '  ( (    (% -$ (

  ($ $ & %(- M=41N J H" I #  (%

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

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

. +- (K $   -$ , ( -  .

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

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

Transmitter Operation During Multi-Drop Mode

  %.
, '%   % +   %($

' ' & -(- MN +   '  (

 $(-   $ (% (   9 (- MN J

HI %% ( . J HI $ %(- MN J HI %% (

. J HI Figure 29 %%  '$ + $(-

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

($ $

 

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