XR68C681 View Datasheet(PDF) - Exar Corporation

Part Name

Description

MFG CO.

XR68C681

CMOS Dual Channel UART(DUART)

Exar Corporation 

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XR68C681

Input

Port

#,

#,

#,

#,1

#,=

#,6

Alternate Function(s)

4
  $ 
 ( + '  

84  (% ( (% '( :" +  
 +'(

*4
  $ 
 ( + '  *

84  (% ( (% '( : +  
 +'(

D254
.(  2!
'3 #

5
*4 2!
'3 ( + '( '  *

5
4 2!
'3 ( + %( ' 

5
4 2!
'3 ( + '( ' 

5
*4 2!
'3 ( + %( '  *

Approach to Program Alternate Functions

#, '  -$  +'( %  
 (

& %(- M=N J    $($ $(%'%%(

  (% +'(" % % Section G.3

#, '  -$  +'( %  
* (

& %(- *M=N J    $($ $(%'%%(

  (% +'(" % % Section G.3

#, '  -$  +'( %   !

''3 ( +  
.( & %(-
M/4=N J

M" " N    $($ $(%'%%( (   ++'

+  (% '( % % Section D.2

#, ' %  -$  +'( %   !

''3 ( +   '( + '  * & %(-

*M@4=N J M" " " N +   /5
'3" 
*M@4=N

J M" " " N +   5
'3

#,1 '  -$  +'( %   !

''3 ( +   %( + '  & %(-

M14N J M" " " N +   /5
'3" 
M14N

J M" " " N +   5
'3

#,= '  -$  +'( %   !

''3 ( +   '( + '  & %(-

M@4=N J M" " " N +   /5
'3" 
M@4=N

J M" " " N +   5
'3

#,6 '  -$  +'( %   !

''3 ( +   %( + '  * & %(-

*M14N J M" " " N +   /5
'3" 
*M14N

J M" " " N +   5
'3

Table 12. Listing of Alternate Function for the Input Port Pins

E.2 Input Port Configuration Registers (IPCR)

  # ,
+(-( -(% (%  H$&I

-(%   %%   +(-  +'(%4

     % 3  (' +   + (  (% 4

#,  #,1" % ' -$ -(' %" %('   % $

+  (% -(%

     % 3   ' -(' % +  %

+ ( (%

%C&"   # ,
+(-( -(% (%

+'(& $(($ (  %'(%4

 *(% @  =4 H
- ( :-(' I #$(+('( (%

 *(% 1 4   ' % + # ,(% #,  #,1

  ( + +   # ,
+(-( -(% (%

%$  ( Table 13.

Bit 7

 #,1

 J 8

 J E%

Bit 6

 #,

 J 8

 J E%

Bit 5

 #,

 J 8

 J E%

Bit 4

 #,

 J 8

 J E%

Bit 3

#,1

 J :

 J 9(-

Bit 2

#,

 J :

 J 9(-

Bit 1

#,

 J :

 J 9(-

Table 13. Bit Format of the Input Port Configuration Register (IPCR)

(+ $(%'%%( + ' (+($" ( (  (% -(% +%

Bit 0

#,

 J :

 J 9(-

 

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