XR88C681
PIN DESCRIPTION
44 PLCC/
LCC
40 DIP,
CDP
1
<
1
6
<
/
6
>
/
=
>
=
1
28 DIP,
CDIP
1
<
6
/
>
=
Symbol Type Description
7
No Connection.
# LSB of Address Input. (% (" - ( $$%% #%"
1 %$ %' '( -(%% ( (
$('" $(- 2 $ B#2 (% ( ,
#,1
# Input Port 3. 0 ,% # B (%
5 #
(- ( #$" (% ( ' % %$ %
5 ?
! ''3 ( + %( 5
#,
*
1
#,
B
5*
7
5*
B (% (- ( ?$" (% ( '
%$ % ! ''3 ( + '(
5
# Address Input.
# Input Port 1. 0 ,% # (% ( ' %
%$ % '( 9" C * $D (
*
# Address Input.
# MSB of Address Input. (% (" - ( $$%% #
%" %$ %' '( -(%% ( (
$('" $(- 2 $ B#2 (% (
,
# Input 0. 0 ,% # (% ( ' % %$
% '(" C $D (
# Write Strobe (Active-Low). CD (% ( ( (%
% CD (% '% + *% ( $
$%%$ -(%" ( ( %+ ''%
(%(- $- + B
# Read Strobe (Active Low). CD (% ( ( (%
% CD '% '% + $$%%$ -(%
" $ %
# Receive Serial Data Input (Channel B). % %(-(+('
( + ' ' (% '($ +(% #+ ! '( ''3"
5*" (% %'(+($" $ (% %$ (%(- $- +
(% ''3
No Connect.
Transmitter Serial Data Output (Channel B). % %(-
(+(' ( + ' ' (% %($ +(% (% (%
$ ( (- 3(- % %( (% ($"
$(%$" ' (% (- ( ' 9,
*: $ #+ ! %( ''3 (% %'(+($"
5*" %($ $ (% % (+$ + %
( (+ -(% +(- $- + (% ''3
<