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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 = pMOS |
+ | | tech 2 = CMOS | ||
| clock min = 150 kHz | | clock min = 150 kHz | ||
− | | clock max = | + | | clock max = 440 kHz |
| package = DIP28 | | package = DIP28 | ||
| package 2 = DIP42 | | package 2 = DIP42 | ||
}} | }} | ||
− | The '''μCOM-4''' line is an [[microprocessor family|extended family]] of [[4-bit architecture|4-bit]] [[microcontroller]]s developed by [[NEC]] in the late 1970s. This family was designed to be low-cost, mass-produced, [[microcontroller]]s for [[electronic cash register|ECRs]], industrial controllers, appliance controllers, games, toys, scientific calculators, and other consumer electronics. The μCOM-4 line is based on the {{nec|μPD751}}, the first Japanese single-chip microprocessor. | + | The '''μCOM-4''' (or uCOM-4) line is an [[microprocessor family|extended family]] of [[4-bit architecture|4-bit]] [[microcontroller]]s developed by [[NEC]] in the late 1970s. This family was designed to be low-cost, mass-produced, [[microcontroller]]s for [[electronic cash register|ECRs]], industrial controllers, appliance controllers, games, toys, scientific calculators, and other consumer electronics. The μCOM-4 line is based on the {{nec|μPD751}}, the first Japanese single-chip microprocessor. |
==Introduction Date== | ==Introduction Date== | ||
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===μCOM-43/44/45=== | ===μCOM-43/44/45=== | ||
The '''{{nec|μCOM-43}}/{{nec|μCOM-44|44}}/{{nec|μCOM-45|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. | The '''{{nec|μCOM-43}}/{{nec|μCOM-44|44}}/{{nec|μCOM-45|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. | ||
+ | |||
+ | * '''{{nec|μCOM-43}}''' - high-end family of MCUs, offering complete support for the entire [[/isa|μCOM-4 ISA]]. | ||
+ | * '''{{nec|μCOM-44}}''' - mid-range family of MCUs, providing a subset of 58 instructions at a reduced cost. | ||
+ | * '''{{nec|μCOM-45}}''' - low-end family of MCUs, providing a subset of 58 instructions and less memory at the cheapest price. | ||
== Design == | == Design == | ||
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== Instruction set == | == Instruction set == | ||
{{main|/isa|l1=μCOM-4 ISA}} | {{main|/isa|l1=μCOM-4 ISA}} | ||
− | The family was originally split into two sets of ISAs. The {{ | + | The family was originally split into two sets of ISAs. The {{nec|μCOM-42}} had an instruction set specifically designed to facilitate its use in [[Electronic Cash Register]] (ECR) and Scale products. The {{nec|μCOM-43}}/{{nec|μCOM-44|4}}/{{nec|μCOM-45|5}} were designed to be general purpose microcontrollers. |
== See also == | == See also == | ||
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{{stub}} | {{stub}} | ||
{{DEFAULTSORT:μCOM-4}} | {{DEFAULTSORT:μCOM-4}} | ||
− | [[Category: | + | [[Category:nec]] |
[[Category:4-bit microprocessors]] | [[Category:4-bit microprocessors]] | ||
[[Category:1977 microprocessors]] | [[Category:1977 microprocessors]] | ||
[[Category:microprocessor families]] | [[Category:microprocessor families]] | ||
− |
Latest revision as of 15:54, 28 June 2019
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[edit]
1977 | 1980 | ||||||
---|---|---|---|---|---|---|---|
Q1 | Q2 | Q3 | Q4 | Q1 | Q2 | Q3 | Q4 |
μCOM-42 | μCOM-43 | μCOM-44 | μCOM-45 | μCOM-75 |
Families[edit]
The μCOM-4 was original divided into two separate domains:
μCOM-42[edit]
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[edit]
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[edit]
This section is empty; you can help add the missing info by editing this page. |
Instruction set[edit]
- 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[edit]
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) + |