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{{nec title|μCOM-4}}
 
{{nec title|μCOM-4}}
 
{{ic family
 
{{ic family
 +
| extended family  = yes
 
| title            = NEC μCOM-4
 
| title            = NEC μCOM-4
 
| image            = <!-- Image representation of the IC family, e.g. "MCS-4.jpg"  -->
 
| image            = <!-- Image representation of the IC family, e.g. "MCS-4.jpg"  -->
Line 6: Line 7:
 
| developer        = NEC
 
| developer        = NEC
 
| manufacturer      = NEC
 
| manufacturer      = NEC
 +
| type              = Microcontrollers
 
| production start  = October, 1977
 
| production start  = October, 1977
 
| 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 size, e.g. "4 bit"                                  -->
+
| word              = 4 bit
 
| proc              = <!-- process, e.g. "8 μm"                                      -->
 
| proc              = <!-- process, e.g. "8 μm"                                      -->
−
| tech              = nMOC
+
| tech              = pMOS
 +
| tech 2            = CMOS
 
| clock min        = 150 kHz
 
| clock min        = 150 kHz
 
| clock max        = 440 kHz
 
| clock max        = 440 kHz
Line 17: Line 20:
 
| package 2        = DIP42
 
| package 2        = DIP42
 
}}
 
}}
−
The '''μCOM-4''' line is a [[microprocessor family|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==
Line 25: Line 28:
 
! Q1 !! Q2 !! Q3 !! Q4 !! Q1 !! Q2 !! Q3 !! Q4  
 
! Q1 !! Q2 !! Q3 !! Q4 !! Q1 !! Q2 !! Q3 !! Q4  
 
|-
 
|-
−
| {{\|μCOM-42}} || {{\|μCOM-43}} || {{\|μCOM-44}} || {{\|μCOM-45}} || || || {{\|μCOM-75}} ||
+
| {{nec|μCOM-42}} || {{nec|μCOM-43}} || {{nec|μCOM-44}} || {{nec|μCOM-45}} || || || {{nec|μCOM-75}} ||
 
|}
 
|}
  
−
== Members ==
+
== Families ==
−
{| class="wikitable sortable"
+
The μCOM-4 was original divided into two separate domains:
−
! Product !! Part Number !! ROM !! RAM !! I/O !! Interrupts !! Instructions !! Pins
+
 
−
|-
+
===μCOM-42===
−
| {{\|μCOM-42}} || {{\|μCOM-42|μPD548}} || 1920x10 bits || 96x4 bits || 35 || 2 || 72 || 42
+
The '''{{nec|μCOM-42}}''' was specifically marketed for [[electronic cash register]]s (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}} || {{\|μCOM-42|μPD546}} || 2000x8 bits || 96x4 bits || 35 || 1 || 80 || 42
+
===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.
−
| {{\|μCOM-44}} || {{\|μCOM-42|μPD547}} || 1000x8 bits || 64x4 bits || 35 || 1 || 58 || 42
+
 
−
|-
+
* '''{{nec|μCOM-43}}''' - high-end family of MCUs, offering complete support for the entire [[/isa|μCOM-4 ISA]].
−
| {{\|μCOM-45}} || {{\|μCOM-42|μPD550}} || 640x8 bits || 32x4 bits || 21 || 1 || 58 || 28
+
* '''{{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.
−
| {{\|μCOM-42 Evachip}} || {{\|μCOM-42|μPD555}} || external || 96x4 bits || 36 || 2 || 72 || 64
 
−
|-
 
−
| {{\|μCOM-43 Evachip}} || {{\|μCOM-42|μPD556}} || external || 96x4 bits || 36 || 1 || 80 || 64
 
−
|}
 
  
 
== 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 {{\|μCOM-42}} had an instruction set specifically designed to facilitate its use in [[Electronic Cash Register]] (ECR) and Scale products. The {{\|μCOM-43}}/{{\|μCOM-44|4}}/{{\|μCOM-45|5}} were designed to be general purpose microcontrollers.
+
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:NEC]]
+
[[Category:nec]]
 
[[Category:4-bit microprocessors]]
 
[[Category:4-bit microprocessors]]
 
[[Category:1977 microprocessors]]
 
[[Category:1977 microprocessors]]
 
[[Category:microprocessor families]]
 
[[Category:microprocessor families]]
−
[[Category:NEC μCOM-4]]
 

Latest revision as of 16:54, 28 June 2019

NEC μCOM-4
no photo (ic).svg
Developer NEC
Manufacturer NEC
Type Microcontrollers
Production October, 1977
Architecture 4-bit
Word size 4 bit
0.5 octets
1 nibbles
Technology pMOS, CMOS
Clock 150 kHz-440 kHz
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.

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]

New text document.svg 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]


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Facts about "μCOM-4 - NEC"
RDF feed
designerNEC +
full page namenec/μcom-4 +
instance ofmicrocontroller extended family +
main designerNEC +
manufacturerNEC +
nameNEC μCOM-4 +
packageDIP28 + and DIP42 +
technologypMOS + and CMOS +
word size4 bit (0.5 octets, 1 nibbles) +