|
XR88C681 Datasheet, PDF (46/99 Pages) Exar Corporation – CMOS DUAL CHANNEL UART (DUART) | |||
|
◁ |
XR88C681
-"
6 '% 6"
/.1
./
'% 1 /
%'
$ - + (!$ (
% (%
'
$ & 7.5 (
(
B
(% (
(% (- "
C(
D $ (% %'$
$ (
% < - 1 3
'
$+(
((
% %
$ 7.5 J
'
(
Table 14 B
==/⢠, % (
(%
$" ( %
% '
% & %(( +
==6⢠,"
$ E(%
&
$$%% '
$ ''3
-
+ , $
Pin Number
<
6
/
>
=
1
1
MN/MX = 1 (Min Mode)
89
89
B
.#
.
27
92
#7
MN/MX = 0 (Max Mode)
).0
).0
9:
)
)
Table 14. MN/MX Mode and Function of Pins 24-31 of 8086 CPU Device.
B
7.5 (% " ==/⢠, (% (
- (
C!D
$ (% $ (% (
$$ + '!
('(
% (
(' ==/⢠, E(% % +
==>
(' $ '%% 7, #
(% $"
%'( % '
=== (% E($ -
&
$ #. '
% %(-
%
==/⢠, '
(
% (
E% (
%4 #7
$ 7# 7# (% '( (- C
%3D (
E% (
L
$ #7 (% C%3D (
E% (
#+ ==/⢠, (% (
- (
C(
D
$"
#7
#
'3
$- (
(%
(
,(
< % Figure 20 8" (+
==/⢠, (% (
- (
C!D $"
#7
%(-
% $($ + " "
$ (
% (
=== % '
Table 15 %
% '%%
%%
$ === '( % %$
" "
$
C!D $ %% %(-
%
S2
S1
S0
Processor State
#
'3
$-
$ #. ,
B( #. ,
8
$
''%%
$ &
B( &
,%%(
8288 Active Output
#7
#
#B
7
B
7
Table 15. 8086 Processor State/8288 Bus Controller Active Output as a function of S0, S1 and S2
</
|
▷ |