XR88C681CP Datasheet, PDF (66/99 Pages) Exar Corporation – CMOS DUAL CHANNEL UART (DUART)

XR88C681
F.2 Output Port Configuration Register (OPCR)
   , ( % '  %$ % 0  ,%  ( %"   & '  ' +(-$  %$ (  
+ '( % Table 24 (%%      '( % + ' +    , ( %
Output Port
,
,
,
,1
,<
,6
,/
,>
Alternate Function(s)
RTSA4 E% $   +
   74  (%  (% '(
9 +    + '( 
RTSB4 E% $   +
  * 74  (%  (% '(
9 +    + '( 
TXCA_16X Output4
  /5  %(
'3 
TXCA_1X Output4
  5  %(
'3 
RXCA_1X Outpu4
  5 '(
'3 
TXCB_1X Output4
  * 5  %(
'3 
RXCB_1X Output4
  * 5 '(
'3 
C/T_RDY4  
 .( $&  +
. S 74  (%  (% 
 (    %$ %  
 .( $& 
RXRDY/FFULL_A Output4
  '( $&. #   # $(' 74
 (% (%   (  +   5G. 99. + '( 
RXRDY/FFULL_B Output4
  * '( $&. #   # $(' 74
 (% (%   (  +   5G. 99.* + '( 
TXRDY_A Output4
   %( $& # $('  (% (%   (
 +   5G. + '( 
TXRDY_B Output4
  *  %( $& # $('  (% (%   (
 +   5G.* + '( 
Table 24. Listing of the Alternate Functions for the Output Port
 & +      '( % +   (%  , ( %  %'$ & (( -   ( $    ,

  ( + +  (% -(% +%
Bit 7
OP7
 J ,N>O
 J 5G*
Bit 6
OP6
 J ,N/O
 J 5G
Bit 5
OP5
 J ,N6O
 J 5G.
99*
Bit 4
OP4
 J ,N<O
 J 5G.
99
Bit 3
Bit 2
OP3
 J ,N1O
 J
. S 
 J 5
* 5
 J 5
* 5
Bit 1
Bit 0
OP2
 J ,NO
 J 5
/5
 J 5
5
 J 5
5
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.
Table 25. Output Port Configuration Register - OPCR
 
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