8-BIT MICROCOMPUTER. UPD8021 Datasheet

UPD8021 MICROCOMPUTER. Datasheet pdf. Equivalent


NEC UPD8021
NEe Microcomputers, Inc.
NEe
ILPD8021
SINGLE CHIP 8·BIT
MICROCOMPUTER
DESCRIPTION
The NECIlPD8021 is a stand alone 8-bit parallel microcomputer incorporating the
following features usually found in external peripherals. The IlPD8021 contains:
1K x 8 bits of mask ROM program memory, 64 x 8 bits of RAM data memory, 21
I/O lines, an B-bit interval timer/event counter, and internal clock circuitry.
FEATURES
8-Bit Processor, ROM, RAM, I/O, Timer/Counter
• Single +5V Supply (+4.5V to +6.5V)
• NMOS Silicon Gate Technology
• 8.381ls Instruction Cycle Time
• All Instructions 1 or 2 Cycles
• Instructions are Subset of IlPD8048/8748/8035
• High Current Drive Capability - 2 I/O Pins
• Clock Generation Using Crystal or Single Inductor
• Zero-Cross Detection Capabil ity
• Expandable I/O Using 1l8243's
• Available in 28 Pin Plastic Package
PIN CONFIGURATION
Pn
P23
PROG
PO~
P01
P02
P03
P04
P07
ALE
T1
VSS
JlPD
8021
vee
P21
26 P20
25 P17
24 P16
23 P15
22 P14
21 P13
20 P12
19 Pll
18 PlO
17 RESET
16 XTAL2
15 XTAL 1
Rev/1
303


UPD8021 Datasheet
Recommendation UPD8021 Datasheet
Part UPD8021
Description SINGLE CHIP 8-BIT MICROCOMPUTER
Feature UPD8021; NEe Microcomputers, Inc. NEe ILPD8021 SINGLE CHIP 8·BIT MICROCOMPUTER DESCRIPTION The NECIlPD802.
Manufacture NEC
Datasheet
Download UPD8021 Datasheet




NEC UPD8021
II. PD8021
BLOCK DIAGRAM
Operating Temperature. . . . . . . . . . . . . . . . . . . . . .
DoC to +70°C
Storage Temperature (Ceramic Package). . . . . . . . . . .
. .. -65°C to +150°C
(Plastic Package) . . . . . . . . . . . . . . . . . . . . -65°C to +125°C
Voltage on Any Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5 to +7 Volts (j)
Power Dissipation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. i Watt
CDNote:
With Respect to Ground.
ABSOLUTE MAXIMUM
RATII\IGS*
COMMENT: Stress above those listed under ,. Absolute Maximum Ratings" may cause permanent
damage to the device. This is a stress rating only and functional operation of the device at these or
any other conditions above those indicated in the operational sections of this specification is not
implied. Exposure to absolute maximum rating conditions for extended periods may affect device
reliability.
*Ta = 25°C
Ta = 0°e to +70° e· Vee = +5 5V +- 1V' VSS = OV
LIMITS
PARAMETER
SYMBOL MIN TYP MAX
Input Low Voltage
(All Except XTAL 1, XTAL 2) VIL
-0.5
+ O.B
Input High Voltage
(All Except XTAL 1, XTAL 2) VIH
2.0
Vee
Input High Voltage
(All Except XTAL 1, XTAL 2) VIH1
3.0
Vee
Output Low Voltage
VOL
0.45
Output Low Voltage
(P10, P11)
VOL1
2.5
Output High Voltage
(All Unless Open Drain)
VOH
2.4
Output Leakage Current
(Open Drain Option - Port 0)
IOL
-10
Vee Supply Current
ICC
60
UNIT
V
V
V
V
V
V
IlA
mA
TEST
CONDITIONS
DC CHARACTERISTICS
Vee = 5.0V ± 10%
Vee = 5.5V ± 1V
IOL = 1.6 mA
IOL=7mA
IOH = 50llA
Vee;;' VIN;;' VSS
+0.45V
.~
Ta =rfc to +70°C: VCC =5.5V ± lV: VSS =OV
PARAMETER
Cycle Time
SYMBOL
TCY
LIMITS
MIN TYP MAX
8.38 SO.O
Oscillator Frequency Variation
(Resistor Mode)
AF
-20
CDNote: Control outputs: CL = 80pF; RL = 2.2K/4.3K
+20
UNIT
~s
%
TEST CONDITIONS
CD3.58 MHz XTAL
for TCY Min.
CDF = 2.5 MHz
AC CHARACTERISTICS
304



NEC UPD8021
PIN IDENTIFICATION
NO.
1·2,
26-27
PIN
SYMBOL
P20,P23
(Port 2)
3
4·11
12
PROG
POO,P07
(Port 0)
ALE
13 T1
14 VSS
15 XTAL1
16
17
18-25
28
XTAL 2
RESET
PlO- P17
(Port 1)
VCC
fI. PD8021
FUNCTION
P20,P23 comprise the 4·bit bi·directionall/O port
which is also used as the expander bus for the
pPD8243.
PROG is the output strobe pin for the pPD8243.
One of the two 8-bit quasi bi·directional I/O ports.
Address Latch Enable output (active·high). Occurring
once every 30 input clock periods, ALE can be used
as an output clock.
Testable input using transfer functions JT1 and JNT1.
T1 can be made the counter/timer input using the
STRT CNT instruction. T1 also provides zero·cross
sensing for low-frequency AC input signals.
Processor's grou nd potential.
One side of frequency source input using resistor,
inductor, crystal or external source. (non-TTL
compatible VIH).
The other side of frequency source input.
Active high input that initializes the processor and
starts the program at location zero.
The second of two 8-bit quasi bi-directional I/O ports.
+5V power supply input.
FUNCTIONAL DESCR IPTION
The NEC pPD8021 is a single component, 8-bit, parallel microprocessor using
N-channel silicon gate MOS technology. The self-contained 1K x 8-bit ROM,
64 x 8-bit RAM, 8-bit timer/counter, and clock circuitry allow the IlPD8021 to
operate as a single-chip microcomputer in applications ranging from controllers to
arithmetic processors.
The instruction set, a subset of the IlPD8048/8748/8035, is optimum for high-volume,
low cost applications where I/O flexibility and instruction set power are required. The
IlPD8021 instruction set is comprised mostly of single-byte instructions with no
instructions over two bytes.
305







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