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μPD554L (μCOM-45L) - NEC
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NEC μCOM-45L
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Manufacturer NEC
Model Number μCOM-45L
Part Number μPD554L
Introduction 1981 (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 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 μPD554L or μCOM-45L is a 4-bit microcontroller introduced in 1981 by NEC as part of their μCOM-45 family. This model is modified to support a lower voltage of -8V. Additionally, it's also 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]

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See also[edit]


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familyμCOM-45 +
first launched1981 +
full page namenec/μcom-45/μpd554l +
instance ofmicrocontroller +
manufacturerNEC +
max operating temperature70 °C +
microarchitectureμCOM-4 +
min operating temperature-10 °C +
model numberμCOM-45L +
nameNEC μCOM-45L +
packageDIP28 +
part numberμPD554L +
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) +