NEC μCOM-45 Family
Developer	NEC
Manufacturer	NEC
Type	Microcontrollers
Production	November, 1977
Architecture	4-bit word, 10-bit instructions
ISA	μCOM-4
Word size	4 bit 0.5 octets 1 nibbles
Technology	pMOS
Clock	150 kHz-440 kHz
Package	DIP28, DIP42

The μCOM-45 (or uCOM-45) was family of general-purpose 4-bit microcontrollers, part of the μCOM-4 extended family. This family offered a subset of the full μCOM-4 ISA, offered a reduced amount of memory and was marketed as the low-end series among the μCOM-4 lines.

Microcontrollers

μCOM-45 Microcontrollers
Model	Part	Introduction	ROM	RAM	Pins
μCOM-45	μPD550	1977	640x8 bit	32x4 bit	28
μCOM-45L	μPD550L	1980	640x8 bit	32x4 bit	28
μCOM-45	μPD554	1978	1000x8 bit	32x4 bit	28
μCOM-45L	μPD554L	1981	1000x8 bit	32x4 bit	28
μCOM-45C	μPD652	1978	1000x8 bit	32x4 bit	42

Design

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μCOM-45 Instruction Set

Main article: μCOM-4 ISA

The μCOM-45 ISA supported a strict subset of the entire μCOM-4 ISA, composed of 58 instructions.

See Also

• μCOM-4
• μCOM-8

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