And - Intel MCS48 User Manual

iny
ID8243
MCS-48™ INPUT/OUTPUT
EXPANDER
-40°C
to
+85°C
Operation
Low
Cost
Simple
Interface
to
MCS-48™
Micro-
computers
Four
4-Bit I/O Ports
AND
and
OR
Directly to Ports
24-Pin
DIP
Single
5V Supply
High Output
Drive
Direct Extension
of
Resident
8048
I/O
Ports
The
Intel®
8243
is
an
input/output expander designed
specifically to
provide a low cost means
of I/O
expansion
for
the
MCS-48
T
"
family
of
single chip microcomputers.
Fabricated
in
5 volts
NMOS,
the
8243 combines
low
cost, single
supply
voltage and
high
drive current
capability.
The
8243
consists
of four
4-bit bidirectional
static
I/O ports
and one
4-bit port
which
serves as
an
interface to the
MCS-48
microcomputers.
The
4-bit interface requires that only 4 I/O
lines of
the 8048 be used
for
I/O expansion, and
also allows
multiple 8243's
to
be
added
to the
same
bus.
The
I/O ports
of
the 8243
serve as a direct
extension
of the resident I/O
facilities
of
the
MCS-48
microcomputers and
are
accessed by
their
own MOV,
ANL, and
ORL
instructions.
PIN
CONFIGURATION BLOCK DIAGRAM
P50
C
1
v
"
24
3v
cc
P40C
2
23
3P51
P41C
3 22
3P52
W2C
4
21
3P53
P43C
5 20
DP60
CSC
PROGC
6
B243
19
7
18
DP61
DP62
P23C
8 17
DP63
P22C
9 16
HP73
P21C
10 15
DP72
P20C
11
14
3P71
gndC
12 13
DP70
o
•o>
\>s
rP
P
4
> PORT
4
CJ
7>
:>
TTU<
X>
4
> PORT
5
a
02
>
4
>
PORT
6
P
^V>
a
INTEL
CORPORATION ASSUMES
NO
RESPONSIBILITY FOR THE
USE OF ANY CIRCUITRY
OTHER THAN
CIRCUITRY
EMBODIED
IN
AN
INTEL PRODUCT.
NO OTHER
CIRCUIT
PATENT LICENSES ARE
IMPLIED.
©
INTEL
CORPORATION, 1979
6-48