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'8021
SINGLE COMPONENT a-BIT MICROCOMPUTER
•
8-Bit
CPU,
ROM,
RAM,
1/0
in Single
•
1K x 8
ROM
28-Pin Package
64
x 8
RAM
21110
Lines
•
Single 5V Supply
(+4.5V
to
6.5V)
•
Interval Timer I Event Counter
•
8.38 p'sec Cycle With 3.58
MHz
XTAL;
• Clock Generated With Single Inductor
All Instructions
1
or
2 Cycles
or
Crystal
•
Instructions-
8048
Subset
•
Zero-Cross Detection Capability
•
High Current Drive
Capability-2
Pins
•
Easily Expandable
1/0
The Intel
I!>
8021 is a totally self·sufficlent a-bit parallel computer fabricated
on
a single silicon chip using Intel's
1')1-
channel silicon gate MOS process. The features of the 8021 include a subset of the 8048 optimized for low cost,
high
volume applications, plus additional
1/0
flexibility and power.
The
8021 contains 1 K X 8 program memory, a 64 X 8 data memory,
21
110 lines, and
an
8-bit timer I event counter,
in
addition
to
on-board oscillator and clock circuits. For systems that require extra
1/0
capability, the 8021 can be
expanded using the 8243 or discrete
logic.
This microprocessor is designed
to
be
an
efficient controller as well as
an
arithmetic processor. The 8021 has bit
handling capability as well as facilities for both binary and
BCD
arithmetic. Efficient use of program memory results
from
an
instru.ction set consisting mostly of single byte instructions and
no
instructions over two bytes
in
length.
To
minimize the development problems and maximize flexibility,
an
8021 system can be easily designed using the
8021 emulation board, the EM·1. The
EM-1
contains a 40-pin socket which can accommodate either the 8748
shipped with the board or
an
ICE-49
plug. Also, the necessary discrete logic
to
reproduce the
8021
's additional
1/0
features Is Included.
PIN
CONFIGURATION
P22
P23
PAOG
PO,
P'6
P02
P'5
P03
P,4
P04
P'3
POe
P'2
P06
P07
ALE
T'
XTAL2
Vss
XTAL 1
LOGIC
SYMBOL
PORT
#fl
PORT
#,
PORT
#2
ADDRESS
LATCH
ENABLE
PORT
EXPANDER
STROBE
6-48
BLOCK DIAGRAM
AFN-o'587A-ol