XR88C681CP Datasheet, PDF (27/99 Pages) Exar Corporation – CMOS DUAL CHANNEL UART (DUART)

XR88C681

'3 0  (% % %( + ' $(( ( -  $
- ( -   '%%& (( - %' +   ==

," +  !  '&%   == &%

  (% % %( + ++( -   ($('( 
 *% $$(( &" %( '   ==
, $(' $%
 $('& ($ '  % %(- %"   == (' (%
% %( +  %( - %(- ( - ( +( " +  
== $('" (    +( -
  *% %(- %L (
$  ''%% &  $ (  $('%
#7  #  '3 $-
2  & $
2B  & B(
#  #  , $
#B   , B(
Figure 6 % %  %' (' +   ==
, $
 7:


,8# 9
G#7
2#7
A;
A6;
07
07
A6;
6;
A;
8224
Clock
Generator
8080A CPU
  6
89
#7
#72
B
*#7
89




B #

1
2 G
<
6
22
/
>
G7

  *2
07
A6;
*27



1
<
8228 ^6
System /
Controller _>
#7
2
2B
#
#B
Figure 6. Schematic of 8080A CPU Module
8080A CPU Module Interrupt Structure
  C#  'D +   ==
, (% $%'($
   ==
, $(' ' %(%% +  %(- %4
#72  $ #7 $$(( &"   == *(('(  *%
' %(%% +  %( -  %(- " #7  #72 (%  
'( (- #  2  "  $ #7 (%  
'( (- #  E% (  #+   C2 
# D ' $ %  ( 3$"   #72 
(  C (- D ( $('( -     ==
, (  
(  E%% + ( % B     #7
( (% %%$ &  (  $(' E%( - 
( "  
, ( ' (% '  ( %'( 
+ '( +  (% ( %'( "  
, $ (
%% #7 (   == *(('(  *% ( 
& --( - #7 CD #7 (%   '( C# 
'3 $-D %(-     
, $ % (
 
>