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 Counter/Timer

  ((- ' '3 % '(%  / (

.( 
.  
. (%  - / (

$'  (' ' %  + % ((-

%'% % (% ( Figure 9 %%  '3 $(- +

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

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

((-   ( $ 
M/4=N !((&


-(% (% /  - = ,% % Table 7 +  

(% (   
.( $" $  

((- %' '% + (%
M/4=N  
. 

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

- (  - +  %(% $

'(%

%'(

('(

(($ & /

,% -(%%


"
:

#,

5

5
*

(($ & /

.(


 $
*

14 5%

.DE

,1

M=/N

Figure 9. A Block Diagram of the Circuitry

Associated with the Counter/Timer

Bit 6

















Bit 5

















Bit 4

















C/T Mode









(

(

(

(

Timing Source

2! #  #,

5
5 
'3 + '  %(

5
* 5 
'3 + '  * %(

5.
:7 # (($$ & /

2! #  #,

2! #  #," (($$ & /

5.
:7 #

5.
:7 # (($$ & /

Table 7. ACR[6:4] Bit Field Definition - C/T

 

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