Intel MCS48 User Manual page 426

INTELLEC PROMPT
48
FUNCTIONAL
DESCRIPTION
"PROMPT"
stands
for
PROgraMming
Tool.
It
is
a
pro-
grammer
for
8748
EPROMs,
and
a
versatile aid for
debugging
MCS-48
programs. Programs can be
entered
via
its
integral panel keyboard,
programming
socket, or
serial
channel. Almost any
terminal
can be
interfaced
to
the
serial channel, including a
teletypewriter, CRT,
or
an
Intellec
microcomputer development
system.
Intellec
PROMPT
48
simplifies
the programming
of
MCS-48
systems.
Like the 8748
it is
radically new, highly
in-
tegrated,
and
expandable.
Like the
MCS-48
family,
it
is
low
cost,
and
ideal for small applications
and programs.
It
is
a design
aid, not
a
development system
with
sophisticated software
and
peripherals.
MCS-48
Processors
PROMPT
48
comes
complete
with
two
of
Intel's
revolu-
tionary
MCS-48
processors: an 8748-4 Single
Compo-
nent
8-Bit
Microcomputer and and
8035-4 Single Compo-
nent
8-Bit
Microcomputer.
Advances
in
n-channel
MOS
technology
allow
Intel,
for the
first
time
to integrate into
one
40-pin
component
all
computer
functions:
8-bit
CPU
1Kx
8-bit
EPROM/ROM
program memory
64
x
8-bit
RAM
data
memory
27
input/output
lines
8-bit
timer/event counter
Performance
—
More
than 90
instructions
—
each one
or
two
cycles
—
make
the single chip MCS-48
equal
in
performance
to
most
multi-chip
microprocessors.
The
MCS-48
is
an
efficient controller
and
arithmetic
pro-
cessor, with extensive
bit
handling,
binary,
and
BCD
arithmetic
instructions. These
are encoded
for
minimum
program
length;
70%
are single byte opera-
tion
codes, and none
is
more
than two
bytes.
Flexibility
—
Three
interchangeable, pin-compatible
devices
offer
flexibility
and low cost
in
development and
production, as
follows:
8748
—
with
user-programmable and
erasable
EPROM
program
memory
for
prototype and
pre-productions
systems.
8048
—
with factory-programmed mask
ROM
memory
for low-cost,
high volume
production.
8035
—
without program memory,
for
use
with external
program memories.
Circuitry
—
Each MCS-48
processor operates on
a
single
+ 5V
supply, with
internal oscillator and clock
driver,
and
circuitry for
interrupts
and
resets. Extra
cir-
cuitry
is in
the 8048
ROM
processor
to
allow low power
standby
operation.
The
64 x
8
RAM
data
memory
can be
independently powered.
Compatibility
—
For
systems
requiring additional
com-
patibility,
the
MCS-48
can be
expanded
with the
new
8243
I/O
expander, 8155
I/O
and
256-byte
RAM,
8755
I/O
and
2K-byte
EPROM,
or
8355
I/O
and 2K
ROM
devices.
MCS-48
processors
readily
interface
to
MCS-80/85
peripherals
and
standard memories.
Memory
Capacity
PROMPT
48
is
a complete,
fully
assembled and powered
microcomputer system
including
program memory,
data
memory,
I/O,
and system monitor beyond
that available
on MCS-48
single
component
computers.
1K
bytes
of
PROMPT
system
RAM
serve as
"writable
program
mem-
ory"
—
a
ROM
simulator
for the
program memory
on
each MCS-48
computer. 256 bytes
of
PROMPT
system
RAM
serve as
"external
data
memory," beyond
the 64
register bytes on each MCS-48
computer. Users may
fur-
ther
expand program
or data
memory
via
the panel
I/O
ports
and bus
connector.
Programming
Programs
written
first in
assembly
language,
are
entered
in
machine
language and
debugged
with
calculator-like ease on
the
large,
informative display
and keyboard
panel.
Most MCS-48
operations can be
specified with
only
two
keystrokes.
Once
entered,
routines can be
exercised one
instruction (single step)
or
many
instructions
at
a
time.
The
principal
MCS-48
register
—
the accumulator
—
is
displayed while
single
stepping.
Programs
can be executed
in
real
time
(GO
NO
BREAK)
or with as
many
as
eight different break-
points
(GO
WITH
BREAK).
Control
PROMPT
48
can be
fully controlled
either by the panel
keyboard and
displays, or remotely by a
serial
channel.
Thus
a
teletypewriter or
CRT
can be used
but neither
is
required.
Access
The
PROMPT
panel
I/O
ports
and bus connector
allow
easy access
to
all
MCS-48
pins except those reserved
for control by the
PROMPT
system, namely
EA
external
access,
SS
single
step,
and
X1,
X2
clock
inputs.
Optional
Expansion
PROMPT
48
may
be expanded beyond
the resources
on
both the
MCS-48
single
component computer
and
the
PROMPT
system.
External program and
data
memory
may
be interfaced
and
input/out ports added
with the
8243
I/O
expander.
9-12