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μPD550L (μCOM-45L) - NEC
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NEC μCOM-45L
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Manufacturer NEC
Model Number μCOM-45L
Part Number μPD550L
Introduction 1980 (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 -8 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 μPD550L or μCOM-45L is a 4-bit microcontroller introduced in 1980 by NEC as part of their μCOM-45 family. This model allows the use of a single lower power supply of -8V, it's also 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]

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See also[edit]


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familyμCOM-45 +
first launched1980 +
full page namenec/μcom-45/μpd550l +
instance ofmicrocontroller +
manufacturerNEC +
max operating temperature70 °C +
microarchitectureμCOM-4 +
min operating temperature-10 °C +
model numberμCOM-45L +
nameNEC μCOM-45L +
packageDIP28 +
part numberμPD550L +
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) +