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μPD554 (μCOM-45) - NEC
< nec‎ | μcom-45

Not to be confused with μPD550 (previous version, also called "μCOM-45").
NEC μCOM-45
no photo (ic).svg
Manufacturer NEC
Model Number μCOM-45
Part Number μPD554
Introduction 1978 (launch)
General information
Family μCOM-45
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 16 B
1.6e-5 MB
0.016 kB
128 b
1.6e-8 GB
(32x4 bit)
ROM 1 kB
0.001 MB
1,000 B
8,000 b
1.0e-6 GB
(1000x8 bit)
Stack 1 levels
Pins
Pins 28
I/O ports 21
Packaging
Package DIP28 (DIP)

The μPD554 or μCOM-45 is a 4-bit microcontroller introduced in 1978 by NEC as part of their μCOM-45 family. This particular model was capable of directly driving fluorescent indicator panels at -35 volts. This model replaces the older μPD550 which had a reduced amount of ROM.

Design[edit]

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Instruction Set[edit]

Main article: μCOM-4 ISA
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Documents[edit]

See also[edit]


Text document with shapes.svg This article is still a stub and needs your attention. You can help improve this article by editing this page and adding the missing information.
familyμCOM-45 +
first launched1978 +
full page namenec/μcom-45/μpd554 +
instance ofmicrocontroller +
manufacturerNEC +
max operating temperature70 °C +
microarchitectureμCOM-4 +
min operating temperature-10 °C +
model numberμCOM-45 +
nameNEC μCOM-45 +
packageDIP28 +
part numberμPD554 +
pin count28 +
ram1.6e-5 MB (0.016 kB, 16 B, 128 b, 1.6e-8 GB) +
ram breakdown32x4 bit +
rom0.001 MB (1 kB, 1,000 B, 8,000 b, 1.0e-6 GB) +
rom breakdown1000x8 bit +
technologypMOS +
word size4 bit (0.5 octets, 1 nibbles) +