XR68C681J View Datasheet(PDF) - Exar Corporation

Part Name

Description

MFG CO.

XR68C681J

CMOS Dual Channel UART(DUART)

Exar Corporation 

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XR68C681

Address

(HEX)



Read Mode Registers

Register Name

Symbol

$ -(%" ' 

" 



% -(%" ' 



%3$ # %

-(%

1

! 9$(- -(%"

' 

=

# ,
-

-(%

6

# % -(%

/

.( 

*& -(%

@

.( :

*& -(%

<

$ -(%" '  *



% -(%" ' 

*



22;2



#

9

#,


#



:

*" *

*

*

! 9$(- -(%"

'  *



# ;' -(%



# ,

9*

#;

#,

2


.(

$




.(

$





Write Mode Registers

Register Name

Symbol

$ -(%"

' 

'3 ' -(%"

' 

$ -(%"

' 

! 9$(- -(%"

' 

!((&
 -(%

" 





9



# %3 -(%

.( 

*& -(%

.( :

*& -(%

$ -(%" '  *

'3 ' -(%"

'  *

$ -(%"

'  *

! 9$(- -(%"

'  *

# ;' -(%

 ,
+(-(

-(% ,  ,@

  , *(%

$

  , *(% 

$

#



:

*" *

*

*

9*

#;

,


,*

,*

Table 1. DUART Port And Register Addressing

Note:

The shaded blocks are not Read/Write registers but rather, “Address-Triggered” Commands.

 

1

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