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XR88C681 Datasheet, PDF (71/99 Pages) Exar Corporation – CMOS DUAL CHANNEL UART (DUART) | |||
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XR88C681
Bit 7
Bit 6
Channel Mode
J 7
J
2'
J 9' 9
J 9
Bit 5
Tx RTS
Control
J 7
J G%
Bit 4
CTS Enable
Tx
J 7
J G%
Bit 3
Bit 2
Bit 1
Bit Length
Bit 0
J 6/1
J /6
J /==
1 J >6
< J =1
6 J =>6
/ J 1=
> J
= J 6/1
J /6
J /==
* J >6
J =1
J =>6
2 J 1=
J
Table 27. Mode Registers - MR2A, MR2B
MR1n[7] - Receiver Request to Send Control
$(
(&" E%
$ (% %%$
-$
& (
3(
- C2 , , *#
7D
C92
, , *#
7D (
(
8" (+
N>O J (% %"
'( ( '
-(
+
'(+('&" %(
- (% ( (
'(
-
(+ (% 8 (% + (% C+
'
D '
(E (% %+ (
(
- '(
2%
Figure 42 %
% $(- (' (%%
'(
$ E%
$ '
+(-(
$ +
'(
MR1n[6] - Receiver Interrupt Select
(% ( %'% ( 5G %% ( 99
%% ( + '
%$ % '(( +
-
(
-
#
E% ," #NO +
$ #N6O +
*
MR1n[5] - Error Mode Select
(% ( '
% (
+ # %% (%
,2" 2" '($ *3 +
#+ (% ( (% %
CD" (% (' '
( (
C 'D 2 $ #+ (% (% (% % CD" (%
(' '
( (
C*'3D 2 $
#
' ' $ % %% (% &
&
' ' (% '
& + # #
'3 $" % (% %
'( -('
+ %% + ' '% '(
- +
# %(
' % C22 2
D '
$
+
% (%%$
MR1n[4:3] - Parity Mode Select
#+ C( (&D C+' (&D (
(% -$"
(& ( (% $$$
%($ ' '%
$
'( +% (& ' '3
'($ ' '%
Section H.2 + $%'((
+ ( $
(
MR1n[2] - Parity Type Select
(% ( %'% 2;27 (& (+ CB#8 ,
#G
2D (% -$
$ % + +'$ (&
( (+ C 2 ,
#GD $ (% -$ #
( $ ( %'% % +
. +- (
(% ( %
++' (+ C7 ,
#GD (% %'$ (
N<41O
MR1n[1:0] - Bits per Character Select
'%
+ (%
%($
$ '($
(
$ +($ + ' ' (% $%
(
'$
" ,
#G"
$ , (%
Mode Register 2 (Channels A and B)
+ '
(% ''%%$
H%
,(
(
%
" (' ''% +
&
''%%
H% -(% %E
C$%D C(%D
$%
'
- '
%
+ (
>
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