Intel MCS48 User Manual page 205

ID8243
EXPANDER INTERFACE
OO
1
c
I
TEST
1
INPUTS
c p
8243
OUTPUT EXPANDER
TIMING
\ /
-CDC
ADDRESS
(4-BITS)
DATA
(4
BITS)
00n
READ 00~]
01
J
WRITE
01
L
P0RT
10
f
OR
10
|
ADDRESS
11
!
AND
11_l
CO
oo
0=
PROG
P20-3
7T
PROG
P20-3
7\
PROG
P20-3
PROG
P20-3
TT
USING MULTIPLE
8243's
6-53