XR68C681CP View Datasheet(PDF) - Exar Corporation

Part Name

Description

MFG CO.

XR68C681CP

CMOS Dual Channel UART(DUART)

Exar Corporation 

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XR68C681

D.3.1 Timer Mode:

,%    +   
. $%"   ( $ (%

  & $  (' (%     +'( + ( 

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

(% % $(%'%%$ 

#   ( $"  
. '% %  - $(($

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

 ( ''3 ($% +   '% +  

.( -(%%"
 $
:  
. '

 %$ %  - (  - ( $ 

$'  /5 ''3 + & (   ($$ &  

*0   %C" (-((- +  
. (% 

   (" ,1

#+  
. (% -$   (   ( $"  

+C'& +   %(-
. %C  ' 

!%%$ % +%4

C/T Output Frequency =

fsts

 • MCTURN • < + MCTLRN

where:

fSTS = The frequency of the selected timing source (See

Table 7)

[CTUR] = the contents of the CTUR register in decimal

form

[CTLR] = the contents of the CTLR register in decimal

form

('  
.  (% $$ %  /5 ''3 %(- &

   '('(&"   %(- (  (% ./  

+C'& +  
.  %(-  +"   ( "

$($ +  
. '  !%%$ % +%4

Bit Rate =

fsts

1 • MCTURN • < + MCTLRN

  '% +  
 $
: -(%% & 

' -$  & ("  ( & -(  3 ++' 

  ! + '&' +   %C   
. -(%

( %(-   % (
.
:  '( +

  $$%%(-- H
82I '$ 

Table 1

 
.   % '(%& %%C H

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.  (  

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

  ' % %$ (
 $
:  

82 2E %% (" (   # %

-(% #M1N" (% % ' ' '&' +   %C

  (% %   % +  
. %  ($('

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

-  ( (   # %3 -(%

# #
1@ '  '$ & (%%(-  

$$%%(--$ H,
82I '$ 

Table 1 #   #2 $" "   '$

$%  '& %  
.

D.3.2 COUNTER MODE

#   ' $"  
. '% $    +

%% ( (
.
:" -((-    '(

+  H
82I '$



82.2E %% ( #M1N (% % 

' (-   ' + /  
. ( '( 

' %   / $ $+ (   ! '

(-

/ ( ( (% %$ &  
, (  H,

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 +  
."    ( ( (- (  

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

 #   %    (- % $ #M1N (% '$

   
. (% %$ (   H,
82I

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

.
:  
, & ' -   '% +

 
:  & (     ' 3% ++'

& +   %%C 
82 '$

#+  %   -$   (% %

 %$ $ %$ +   ! '&'

 

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