XR68C681J-F Datasheet, PDF (27/75 Pages) Exar Corporation – CMOS Dual Channel UART(DUART)

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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