XR88C681CP Datasheet, PDF (18/99 Pages) Exar Corporation – CMOS DUAL CHANNEL UART (DUART)

XR88C681
C. INTERRUPT CONTROL BLOCK
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Register
#
#
#
#;
Description
#  % -(%
#  %3 -(%
%3$ #  % -(%
#  ;' -(%
Address Location
(in DUART Address Space)
6_/ $  &
6_/ B(  &
_/ $  &

_/
Table 4. Listing and Brief Description of Interrupt System Registers
    $ % + ' +  % -(%% 
$+( $ 
C.1 Interrupt Status Registers (ISR)
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(  ' $(( % #+  & (% ( (  % -(%% 
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(   (% -(%    # %3$ #  %
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Table 54
Bit 7
Input Port
Change
 J 7
 J G%
Bit 6
Delta Break
B
 J 7
 J G%
Bit 5
RXRDY/
FFULLB
 J 7
 J G%
Bit 4
TXRDYB
 J 7
 J G%
Bit 3
Counter
Ready
 J 7
 J G%
Bit 2
Delta Break
A
 J 7
 J G%
Bit 1
RXRDY/
FFULLA
 J 7
 J G%
Bit 0
TXRDYA
 J 7
 J G%
Table 5. ISR Bit Format
  $+( (( +    ( -  ( $ ' +  % (% (%
% $ 
ISR[7]: Input Port Change of State
#+  (% ( (%   -(' CD"    '  - + % %
$'$  #  , ( % #,  #,1   % $
%('  (% (  & $( -   #,
 (+ #N>O J 
#N>O (% '$    
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 - + 
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" % Section F
Please note that in order to enable this Interrupt
Condition, the user must do two things:
 B(   ( $     ( +  
!((&
  -(%"
N14O #  (% %"  
% (% %'(+&( -  (' #  ,( % % $ (-- 
C#  ,
 -D #  E%
 
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