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μPD557L (μCOM-43SL) - NEC
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NEC μCOM-43SL
no photo (ic).svg
Manufacturer NEC
Model Number μCOM-43SL
Part Number μPD557L
Introduction 1981 (launch)
General information
Family μCOM-43
Clock 100 kHz-180 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 -8.0 V
Supply VSS 0 V
Memory
RAM 48 B
4.8e-5 MB
0.048 kB
384 b
4.8e-8 GB
(96x4 bit)
ROM 2 kB
0.002 MB
2,000 B
16,000 b
2.0e-6 GB
(2000x8 bit)
Stack 3 levels
Pins
Pins 28
IRQ lines 1
I/O ports 21
Packaging
Package DIP28 (DIP)

The μPD557L or μCOM-43SL is a general-purpose 4-bit microcontroller introduced in 1980 by NEC. This MCU is a 28-pin, low-power part of the μCOM-43 family, working with a reduced supply voltage of -8.0 VGG. This model has open-drain outputs capable of being pulled to -35V, allowing direct driving of Vacuum Fluorescent Displays.

Design[edit]

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Instruction Set[edit]

Main article: μCOM-4 ISA

This model executes the full 80-instructions set of the μCOM-43 family.

Documents[edit]

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References[edit]

  • NEC Microcomputers, Inc., 1980 Catalog, "μCOM-4: 4-Bit Single Chip Microcomputer Family, μCOM-43SL CPU μPD557L", 104, 125-126 pp.
  • NEC Microcomputers, Inc., 1981 Catalog, "μCOM-4: 4-Bit Single Chip Microcomputer Family, μPD557L μCOM-43SL", 155, 177-178 pp.
  • NEC Electronics (Europe) GmbH, 1982 Catalog, "μCOM-4: 4-Bit Single Chip Microcomputer Family, μPD557L μCOM-43SL", 12, 159-160 pp.

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-43 +
first launched1981 +
full page namenec/μcom-43/μpd557l +
instance ofmicrocontroller +
manufacturerNEC +
max operating temperature70 °C +
microarchitectureμCOM-4 +
min operating temperature-10 °C +
model numberμCOM-43SL +
nameNEC μCOM-43SL +
packageDIP28 +
part numberμPD557L +
pin count28 +
ram4.8e-5 MB (0.048 kB, 48 B, 384 b, 4.8e-8 GB) +
ram breakdown96x4 bit +
rom0.002 MB (2 kB, 2,000 B, 16,000 b, 2.0e-6 GB) +
rom breakdown2000x8 bit +
technologypMOS +
word size4 bit (0.5 octets, 1 nibbles) +