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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
1 K 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"
8049
~
2Kx8
128x
8
27
~
~
~
~
ON
CHIP
FEATURES
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, 1/0, and an AID
converter.
The
8021
is a new very
low
cost MCS-48
family member which contains a subset
of
8048
8021
8022
FEATURES
~
~
~
8·BIT
CPU
1Kx8
1Kx
8
2Kx8
PROGRAM MEMORY
64x8
64x8
64x
8
DATA RAM
27
21
28
1/0
LINES
~
~
~
TIMER COUNTER
~
~ ~
OSCILLATOR AND CLOCK
~
~
~
RESET CIRCUIT
~ ~
INTERRUPT
1-1