XR68C681 View Datasheet(PDF) - Exar Corporation

Part Name

Description

MFG CO.

XR68C681

CMOS Dual Channel UART(DUART)

Exar Corporation 

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XR68C681

Output Port

,

,

,

,1

,=

,6

,/

,@

Alternate Function(s)

RTSA: C%$   + '   84  (%  (% '( : +    +'

(

RTSB: C%$   + '  * 84  (%  (% '( : +    +'

(

TXCA_16X Output:
 /5 %(
'3 4

TXCA_1X Output:
 5 %(
'3 

RXCA_1X: Output:
 5 '(
'3 

TXCB_1X Output:
 * 5 %(
'3 4

RXCB_1X Output:
 * 5 '(
'3 

C/T_1_RDY:  
.( $&  +
. P Note: This output is an Open-Drain output

when used as the Counter/Timer Ready Output.

RXRDY/FFULL_A Output:
 '( $&. #   #$(' 84  (% (%  

(  +   5E. ::D +'(

RXRDY/FFULL_B Output:
 * '( $&. #   #$(' 84  (% (%  

(  +   5E. ::D* +'(

TXRDY_A Output:
 %( $& #$('  (% (%  (  +  

5ED +'(

TXRDY_B Output:
 * %( $& #$('  (% (%  (  +  

5ED* +'(

Table 15. Listing of the Alternate Functions for the Output Port

& +    '(% +   (%   (%  %'$ & ((-   ( $    ,


  ( + +  (% -(% +%

Bit 7

OP7

 J ,M@N

 J 5E*

Bit 6

OP6

 J ,M/N

 J 5E

Bit 5

OP5

 J ,M6N

 J 5E.

::*

Bit 4

OP4

 J ,M=N

 J 5E.

::

Bit 3

Bit 2

OP3

 J ,M1N

 J
. P 

 J 5
*5

 J 5
* 5

Bit 1

Bit 0

OP2

 J ,MN

 J 5
/5

 J 5
5

 J 5
5

Table 16. Output Port Configuration Register - OPCR

Note:

OPCR only addresses the alternate functions for output port pins, OP7 - OP2. OP0 and OP1 assume their RTS roles if either

MR1n[7] = 1 or MR2n[5] = 1. Setting those mode register bits enables the RTS function. Otherwise, these two ports will only be

general purpose output ports.

G. SERIAL CHANNELS A and B

2' %( '  +    '(%% 

+$! %&' % '( $ %(  

 ' % ' ($$& %'  ( (-

+C'& +   *0"  
."   ! ''3 %

 % (- $ *%($%    $ (

 ('   '( $ %( + ' ' 

 ($$&"    '  '+(-$ 

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

' $  $(-%('%" %  % (  3 

$ %$ + ($ ('(%

 

=

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