XR82C684CJ-F Datasheet, PDF (21/107 Pages) Exar Corporation – CMOS Quad Channel UART(QUART)

XR82C684
       % * ' *  % ,(%% 
*(   37
C.1 Interrupt Status Registers (ISR1 and ISR2)
  '  % *   $% ( ('%   %% * 
  ( (  ' (( % $*  & (% 3( (  %
,(%%   ,, / (, 1#     ' % ( ,
' (( %  (% ''( , $ , #   '  % *
  $ 3( ( ('     '%% #   % '   
% *    $  I% *     
 * #  & (  %('  (  *     
%  ,( & ( , (   % ,(%%   
$% %6 $  % ,(%%  
(*  *   3 $%  %   37
ISR1 Register Bit Format
Bit 7
Input Port
Change
L:
 L H%
Bit 6
Delta Break
B
L:
 L H%
ISR2 Register Bit Format
Bit 7
Input Port
Change
L:
 L H%
Bit 6
Delta Break
D
L:
 L H%
Bit 5
RXRDY/
FFULLB
L:
 L H%
Bit 5
RXRDY/
FFULL D
L:
 L H%
Bit 4
TXRDYB
L:
 L H%
Bit 3
Counter #1
Ready
L:
 L H%
Bit 2
Delta Break
A
L:
 L H%
Bit 1
RXRDY/
FFULLA
L:
 L H%
Bit 4
TXRDY D
L:
 L H%
Bit 3
Counter #2
Ready
L:
 L H%
Bit 2
Delta Break
C
L:
 L H%
Bit 1
RXRDY/
FFULL C
L:
 L H%
Bit 0
TXRDYA
L:
 L H%
Bit 0
TXRDY C
L:
 L H%
  *( (( *    ( ,  (  ' *  % (% (%
%   3
C.1.1 ISR1 Register - Channels A and B
ISR1[7]: Input Port Change of State:
$*  (% ( (%    ,(' /1#    '  , * % 3%
'  $  +  ( % $+  $+4   % %('%
 (% (  & ( , $+
 (* $PBQ L  $PBQ (%
' 3   
+ %    $  + 

*(,( ,(% D  $+
 )& ( , $+
#
  % 3( ( 7
   $  +  (   '  , %
   *(  % *    (  (   %# *  3( ,
 
 , * 
   ( %'(( *   $+
# % %
Section E
Please note that in order to enable this Interrupt
Condition, the user must do two things:
1. Write the appropriate data to the lower nibble of the
Auxiliary Control Register, ACR1[3:0]. In this step, the
user is specifying which of the four Input Pins, IP0 - IP3,
should trigger an “Input Port Change” Interrupt request.
2. Write a logic “1” to IMR1[7].
ISR1[6] Delta Break Indicator - Channel B:
E   (% ( (% %# ( ( ('%    
  )
'( % '   ,( ( ,    *  '(
6 )  (% ( (% '   % 3   
+
(  6%  '   ) /55 )5=
;:25
$:5 +1 '   % Table 2    
( * ( (     K% % %   )5=
' (( # % % Section G.2
ISR1[5] RXRDY/FFULL B - Channel B Receiver
Ready or FIFO Full
  * '( *  (% ( (% %' &  ,( ,
)P.Q $*  (% ( *( (% ' *(,  * '( %  
'( & ( ('  8!H)#    /1 (  (%
(*( ( ('%    %  ' ' *  (% (
;)   (% &    &  
+   (% ( (% %
3   ' ' (%  %* *    '( % (*
,(%    ;)   (% ' 3   
+ %
  ;) $*    %(   ' '% ( ;) *
   ( #   ( 3(  % ,( * ;) (%
/ 1
$*  (% ( (% ' *(,  * '( %   /$ 1
$ ('   <<)#   ( (% % 3   ' ' (%
 %* *      ;)      %*
'%% ;)  '  *  (% ( (% ' 3   

+ % ;).    & / ( ,1   $#