Semiconductor & Computer Engineering
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| production end = <!-- production end date, e.g. "January 1, 1985" or "1973" --> | | production end = <!-- production end date, e.g. "January 1, 1985" or "1973" --> | ||
| arch = 4-bit | | arch = 4-bit | ||
| − | | word = | + | | word = 4 bit |
| proc = <!-- process, e.g. "8 μm" --> | | proc = <!-- process, e.g. "8 μm" --> | ||
| − | | tech = | + | | tech = nMOS |
| clock min = 150 kHz | | clock min = 150 kHz | ||
| clock max = 1 mHz | | clock max = 1 mHz | ||
Revision as of 00:04, 19 May 2016
| NEC μCOM-4 | |
.svg)
| |
| Developer | NEC |
| Manufacturer | NEC |
| Type | Microcontrollers |
| Production | October, 1977 |
| Architecture | 4-bit |
| Word size | 4 bit 0.5 octets
1 nibbles |
| Technology | nMOS |
| Clock | 150 kHz-1 mHz |
| Package | DIP28, DIP42 |
The μCOM-4 (or uCOM-4) line is an extended family of 4-bit microcontrollers developed by NEC in the late 1970s. This family was designed to be low-cost, mass-produced, microcontrollers for ECRs, industrial controllers, appliance controllers, games, toys, scientific calculators, and other consumer electronics. The μCOM-4 line is based on the μPD751, the first Japanese single-chip microprocessor.
Contents
Introduction Date
| 1977 | 1980 | ||||||
|---|---|---|---|---|---|---|---|
| Q1 | Q2 | Q3 | Q4 | Q1 | Q2 | Q3 | Q4 |
| μCOM-42 | μCOM-43 | μCOM-44 | μCOM-45 | μCOM-75 | |||
Families
The μCOM-4 was original divided into two separate domains:
μCOM-42
The μCOM-42 was specifically marketed for electronic cash registers (ECRs), Point of Sale (POS), and electronic scale applications. The μCOM-42 chips were specifically designed for controlling 8x4 keyboards, 8-digit displays, and various ECR-type printers. The μCOM-42 had a separate, modified instruction set, compared with the rest of the μCOM-4 families.
μCOM-43/44/45
The μCOM-43/44/45 was marketed as a general-purpose microcontroller suited for a large array of low-cost consumer and industrial applications. These MCUs shared a common instruction set.
- μCOM-43 - high-end family of MCUs, offering complete support for the entire μCOM-4 ISA.
- μCOM-44 - mid-range family of MCUs, providing a subset of 58 instructions at a reduced cost.
- μCOM-45 - low-end family of MCUs, providing a subset of 58 instructions and less memory at the cheapest price.
Design
 |
This section is empty; you can help add the missing info by editing this page. |
Instruction set
- Main article: μCOM-4 ISA
The family was originally split into two sets of ISAs. The μCOM-42 had an instruction set specifically designed to facilitate its use in Electronic Cash Register (ECR) and Scale products. The μCOM-43/4/5 were designed to be general purpose microcontrollers.
See also
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This article is still a stub and needs your attention. You can help improve this article by editing this page and adding the missing information. |
Warning: Default sort key "μCOM-4" overrides earlier default sort key "μCOM-4, NEC".
| designer | NEC + |
| full page name | nec/μcom-4 + |
| instance of | microcontroller extended family + |
| main designer | NEC + |
| manufacturer | NEC + |
| name | NEC μCOM-4 + |
| package | DIP28 + and DIP42 + |
| technology | pMOS + and CMOS + |
| word size | 4 bit (0.5 octets, 1 nibbles) + |