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μPD550 (μCOM-45) - NEC
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NEC μCOM-45
no photo (ic).svg
Manufacturer NEC
Model Number μCOM-45
Part Number μPD550
Introduction 1977 (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 -35 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 640 B
6.4e-4 MB
0.64 kB
5,120 b
6.4e-7 GB
(640x8 bit)
Stack 1 levels
Pins
Pins 28
I/O ports 21
Packaging
Package DIP28 (DIP)

The μPD550 or μCOM-45 is a 4-bit microcontroller introduced in 1977 by NEC as part of their μCOM-45 family. This particular model was capable of directly driving fluorescent indicator panels at -35 volts.

Design[edit]

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Instruction Set[edit]

Main article: μCOM-4 ISA
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Documents[edit]

See also[edit]


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familyμCOM-45 +
first launched1977 +
full page namenec/μcom-45/μpd550 +
instance ofmicrocontroller +
manufacturerNEC +
max operating temperature70 °C +
microarchitectureμCOM-4 +
min operating temperature-10 °C +
model numberμCOM-45 +
nameNEC μCOM-45 +
packageDIP28 +
part numberμPD550 +
pin count28 +
ram1.6e-5 MB (0.016 kB, 16 B, 128 b, 1.6e-8 GB) +
ram breakdown32x4 bit +
rom6.4e-4 MB (0.64 kB, 640 B, 5,120 b, 6.4e-7 GB) +
rom breakdown640x8 bit +
technologypMOS +
word size4 bit (0.5 octets, 1 nibbles) +