Editing nec/μcom-4

{{nec title|μCOM-4}}
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 were the first Japanese single-chip microprocessor.

===Introduction Date===
{| class="wikitable"
! colspan="4" | 1977 !! colspan="4" | 1980
|-
! Q1 !! Q2 !! Q3 !! Q4 !! Q1 !! Q2 !! Q3 !! Q4 
|-
| {{nec|μCOM-42}} || {{nec|μCOM-43}} || {{nec|μCOM-44}} || {{nec|μCOM-45}} || || || {{nec|μCOM-75}} ||
|}

==Lines==
===μCOM-42===
The '''μCOM-42''' (also referred to as '''{{nec|μPD548}}''') 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 single-chip had single-byte 72 instructions with a 10[[µsec]] instruction cycle. The chip included 1920x10-bit [[program memory]], 96x4-bit [[data memory]], 4-level [[hardware stack|stack]], 2 [[interrupt request|interrupt request lines]], and various I/O ports.

===μCOM-43===
The '''μCOM-43''' (also referred to as '''{{nec|μPD546}}''') was marketed as a general-purpose microcontroller suited for a large array of low-cost consumer and industrial applications.

The single-chip had 80 general instructions with a 10[[µsec]] instruction cycle. The chip included 2000x8-bit [[program memory]], 96x4-bit [[data memory]], 3-level [[hardware stack|stack]], various [[interrupt request|interrupt request lines]] and 35 I/O ports.

===μCOM-44===
The '''μCOM-44''' (also referred to as '''{{nec|μPD547}}''') was marketed as a low cost general-purpose microcontroller suited specifically well for various controllers due to its large amount of I/O ports, similar to the μCOM-43.

The single-chip had a reduced 58 general instructions with a 10[[µsec]] instruction cycle. The chip included a reduced [[program memory]] of 1000x8-bit, reduced [[data memory]] of 64x4-bit, a single-level [[hardware stack|stack]], but a large set of 35 I/O ports.

===μCOM-45===
The '''μCOM-45''' (also referred to as '''{{nec|μPD550}}''') was the low-end, ultra low cost general-purpose microcontroller suitable for  mass-produced extremely low cost consumer products.

Like the μCOM-44, the μCOM-45 had a reduced instruction set of 58 instructions with a 10[[µsec]] instruction cycle. The chip included a reduced [[program memory]] of 640x8-bit, reduced [[data memory]] of 32x4-bit, a single-level [[hardware stack|stack]], and only 21 I/O ports.

===μCOM-75===
The '''μCOM-75''' series were introduced in early 1980 made in [[CMOS]] technology and had comparable features to the previous ''μCOM-4'' product line.


{{stub}}
{{DEFAULTSORT:μCOM-4}}
[[Category:NEC]]
[[Category:4-bit microprocessors]]
[[Category:1977 microprocessors]]
[[Category:microprocessor families]]
[[Category:NEC μCOM-4]]
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) +