NEC μCOM-44C
Manufacturer	NEC
Model Number	μCOM-44C
Part Number	μPD651
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	-30 °C – 85 °C
Supply VDD	5 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 μPD651 or μCOM-44C is a 4-bit microcontroller introduced in 1978 by NEC. This is a CMOS variant of the μCOM-44 family designed to operate at standard +5V. This MPU also has an extended operating temperature of -30 °C to 85 °C.

Design

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Instruction Set

Main article: μCOM-4 ISA

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Documents

• NEC μPD651 datasheet

See also

• μCOM-44
• μCOM-4
• μCOM-8

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