XR88C681 Datasheet, PDF (53/99 Pages) Exar Corporation – CMOS DUAL CHANNEL UART (DUART)

XR88C681
D.3 Counter/Timer
  (( -
  *'3 % ' ( %  / (

 .( 
.  
. (%  - / (
$ '   (' ' %   + % (( -
%'% % (% (  Figure 28 % %  '3 $(-
+   '('(& % $( -  
.   %'( +  %
(( - %'% +  
 .( '  $ &
(( -   ( $ 
N/4<O  !((&
 
-(% (% /  - < ,% % Table 16 +  
( % (   
 .( $"  
(( - '  $
N/4<O  
.  (% (
  
'3 ' -(%% + % %  -
(  -  +   %(%  $ '(%
%'(

('(
(($ & /
#,
5

5
*
(($ & /
,% -(%%

"
9

 .(

N</O
 14 5%

..G
,1
Figure 28. 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.
9: #  (($$ & /
2!  #   #,
2!  #   #," (($$ & /
5.
9: # 
5.
9: #  (($$ & /
 
Table 16. ACR[6:4] Bit Field Definition - C/T
61