NEC μCOM-44H
Manufacturer	NEC
Model Number	μCOM-44H
Part Number	μPD552
Introduction	1978 (launch)
General information
Family	μCOM-44
Clock	150 kHz-440 kHz
Microarchitecture
Microarchitecture	μCOM-4
Technology	pMOS
Word size	4 bit 0.5 octets 1 nibbles
Electrical
Op. Temp	-10 °C – 70 °C
Supply VDD	-10 V
Supply VSS	0 V
Memory
RAM	32 B 3.2e-5 MB 0.032 kB 256 b 3.2e-8 GB (64x4 bit)
ROM	1.25 kB 0.00125 MB 1,250 B 10,000 b 1.25e-6 GB (1000x10 bit)
Stack	1 levels
Pins
Pins	42
I/O ports	35
Packaging
Package	DIP42 (DIP)

The μPD552 or μCOM-44H is a 4-bit microcontroller introduced in 1978 by NEC. This MPU is a high-negative version capable of being pulled to -35V in order to drive various displays directly.

Design

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Instruction Set

Main article: μCOM-4 ISA

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Documents

• NEC μPD552 datasheet

See also

• μCOM-44
• μCOM-4
• μCOM-8

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