NEC μCOM-43 Family
Developer	NEC
Manufacturer	NEC
Type	Microcontrollers
Production	May, 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	DIP42

The μCOM-43 (or uCOM-43) was family of general-purpose 4-bit microcontrollers, part of the μCOM-4 extended family. The μCOM-43 offered real hardware interrupt capabilities (as opposed to pseudo in the μCOM-44 and μCOM-45).

Microcontrollers

μCOM-43 Microcontrollers
Model	Part	Introduction	ROM	RAM	Pins
μCOM-43	μPD546	1977	2000x10 bit	96x4 bit	42
μCOM-43H	μPD553	1978	2000x8 bit	96x4 bit	42
EVACHIP-43	μPD556 μPD556B	1977		96x4 bit	64
μCOM-43SL	μPD557L	1981	2000x8 bit	96x4 bit	28
μCOM-43C	μPD650	1978	2000x10 bit	96x4 bit	42

Design

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μCOM-43 Instruction Set

Main article: μCOM-4 ISA

The μCOM-43 ISA supported the entire μCOM-4 ISA which included 80 instructions.

Documents

Datasheet

• µCOM-43 Single Chip Microcomputer Users' Manual

See Also

• μCOM-4
• μCOM-8

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