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8041
AJ8641
AJ8741
A
UNIVERSAL
PERIPHERAL
INTERFACE
8·BIT
MICROCOMPUTER
• 8·Blt CPU plus ROM, RAM,
1/0,
Timer
and
Clock in a Single Package
• One 8·Bit Status and Two Data Regis·
ters for Asynchronous Slave·to·Master
Interface
•
DMA, Interrupt, or Polled Operation
Supported
• Fully Compatible with MCS·48™,
MCS.80™, MCS·85™,
and MCS·86™
Microprocessor Families
• Interchangeable ROM and EPROM
Versions
• 3.6
MHz
8741A·8 Available
•
Expandable
1/0
• RAM Power· Down Capability
• 1024)( 8 ROMIEPROM,
64)(
8 RAM,
8·Blt TimerlCounter, 18 Programmable
1/0
Pins
• Over 90 Instructions:
70%
Single Byte
• Single 5V Supply
The Intell!)
8041A18741A
is a general purpose, programmable interface device designed for use with a variety
of
8-bit
microprocessor systems.
It contains a low cost microcomputer with program memory, data memory, 8-bit
CPU,
I/O
ports, timer/counter, and clock in a single 40-pin package. Interface registers
are
included
to
enable the
UPI
device
to
function
as
a peripheral controller in
MCS-48™,
MCS-80™, MCS-85™,
MCS-86™,
and other 8-bit systems.
The
UPI-41ATM
has 1 K words
of
program memory and
64
words
of
data memory on-chip.
To
allow full user flexibility the
program memory is available
as
ROM
in the 8041A version or
as
UV-erasable
EPROM
in the 8741A version. The 8741A
and the
8041
A are fully pin compatible
for
easy transition from prototype
to
production level designs. The 8641A is a
one-time programmable (at the factory) 8741A which can
be
ordered
as
the first
25
pieces of a new.8041A order. The
substitution
of
8641A's for 8041A's allows for very fast turnaround for initial code verification and evaluation results.
The device has two 8-bit, TTL compatible
I/O
ports
and
two test inputs. Individual port lines can function
as
either in-
puts or outputs under software control. I/O can
be
expanded with the
8243
device which is directly .compatlble and has
16
I/O
lines.
An
8-bit programmable timer/counter is included in the
UPI
device for generating timing sequences or
counting external inputs. Additional
UPI
features include: single
5V
supply, low power standby mode (in the
8041A),
single-step mode for debug (in the
8741A),
and dual working register banks.
Because
ifs
a complete microcomputer, the
UPI
provides more flexibility for the designer than conventional
LSI
inter-
face devices.
It
is·
designed to
be
an
efficient controller
as
well
as
an
arithmetic processor. Applications include
key-
board scanning, printer control, display multiplexing
and
similar functions which involve interfacing peripheral
devices to microprocessor systems.
PIN CONFIGURATION
BLOCK DIAGRAM
INTERNAL
BUS
'0)
MAITIR
SVSTEM
1
::·¢:E::::;~~=~===~
,.,
.........
-
0lI-_
01--
..
-
k;====:::J
SYNC
1Ii--
'"00
omT--
CR~~T~~{XTAL1
__
1
,,1..
I
CLOCK
XTAL2--
9-123
PERIPHERAL
INTERFACE
00188A