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| package type    = DIP
 
| package type    = DIP
 
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The '''μPD557L''' or '''μCOM-43SL''' is a general-purpose {{arch|4}} [[microcontroller]] introduced in 1980 by [[NEC]]. This MCU is a 28-pin, low-power part of the {{nec|μCOM-43|μCOM-43 family}}, working with a reduced supply voltage of -8.0 V<sub>GG</sub>. This model has open-drain outputs capable of being pulled to -35V, allowing direct driving of [[Vacuum Fluorescent Display]]s.
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The '''μPD557L''' or '''μCOM-43SL''' is a general-purpose {{arch|4}} [[microcontroller]] introduced in 1981 by [[NEC]]. This MCU is part of the {{nec|μCOM-43|μCOM-43 family}}. This model is capable of being pulled to -35V, allowing direct driving of [[Vacuum Fluorescent Display]]s.
  
 
== Design ==
 
== Design ==
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== Instruction Set ==
 
== Instruction Set ==
 
{{main|nec/μcom-4/isa|l1=μCOM-4 ISA}}
 
{{main|nec/μcom-4/isa|l1=μCOM-4 ISA}}
This model executes the full 80-instructions set of the μCOM-43 family.
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{{empty section}}
  
 
== Documents ==
 
== Documents ==
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== References ==
 
== References ==
*NEC Microcomputers, Inc., 1980 Catalog, "μCOM-4: 4-Bit Single Chip Microcomputer Family, μCOM-43SL CPU μPD557L", 104, 125-126 pp.
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*NEC Electronics (Europe) GmbH, 1982 Catalog, "μCOM-4: 4-Bit Single Chip Microcomputer Family", 159-160 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 ==
 
== See also ==

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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) +