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UPD8021のメーカーはNECです、この部品の機能は「SINGLE CHIP 8-BIT MICROCOMPUTER」です。 |
部品番号 | UPD8021 |
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部品説明 | SINGLE CHIP 8-BIT MICROCOMPUTER | ||
メーカ | NEC | ||
ロゴ | |||
このページの下部にプレビューとUPD8021ダウンロード(pdfファイル)リンクがあります。 Total 6 pages
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
1 Page 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
3Pages ,.,. PD8021
PACKAGE OUTLINE
J.!PD8021C
308 SP8021-1-80-CAT
6 Page | |||
ページ | 合計 : 6 ページ | ||
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PDF ダウンロード | [ UPD8021 データシート.PDF ] |
データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。 |
部品番号 | 部品説明 | メーカ |
UPD8021 | SINGLE CHIP 8-BIT MICROCOMPUTER | NEC |
UPD8022 | SINGLE CHIP 8-BIT MICROCOMPUTER | NEC |