Intel MCS48 User Manual page 19

INTRODUCTION
1.0
Introduction
to
MCS-48™
Recent advances
in
NMOS
technology
have allowed
Intel
for the
first
time
to
place
enough
capability
on
a
single silicon die to
create a true single-chip
microcomputer
containing
all
the functions required
in
a
digital
processing system.
A
set of
such
microcomputers on
single chips, their
variations,
and
optional
peripherals are
collectively called the
MCS-48
micro-
computer
family.
These
products are
fully
described
in
this
manual.
The head
of
the family
is
the 8048
microcomputer which
contains the following
functions
in
a single
40
pin
package:
8-Bit
CPU
1K
x 8
ROM
Program
Memory
64 x 8
RAM
Data
Memory
27
I/O Lines
8-Bit
Timer/Event Counter
A
2.5
or
5.0
microsecond
cycle time and
a
repertoire of over
90
instructions,
each
consisting
of either
one
or
two
cycles,
makes
the single chip 8048
the equal
in
performance
of
most
presently available
multi-chip
NMOS
microprocessors.
The
8048
is,
however,
a
true
"low-cost"
microcomputer.
A
single
5V
supply
re-
quirement
for
all
MCS-48 components
assures
that
"low
cost" also applies
to
the
power
supply
in
your system.
New
Family
Members
The MCS-48
family
of
microcomputers
which began
with the
8048 and 8748
has
now
been expanded
with
new members
which
provide either
more
capability or
lower cost than
the
original
family
mem-
bers.
While broadening
the applications
possible with a single chip microcomputer,
these
new
microcomputers
share both
the
instruction set
and development
support
of
the 8048.
The
8049
is
a single-chip
microcomputer
which
is
completely interchangeable
with
the 8048, but contains twice the program
memory
and
twice the data
memory
of
the
8048.
The
8022
is
an 8021-based microcomputer
with additional
memory,
I/O,
and
an A/D
converter.
The
8021
is
a
new
very low
cost
MCS-48
family
member
which
contains
a
subset
of
8049
2Kx8
128x8
27
8048
1Kx8
64x8
27
8021
IS
1Kx8
64x8
21
8022
2Kx8
64x8
28
FEATURES
8-BIT
CPU
PROGRAM MEMORY
DATA RAM
I/O
LINES
TIMER
COUNTER
OSCILLATOR
AND CLOCK
RESET
CIRCUIT
INTERRUPT
ON
CHIP
FEATURES
1-1