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μPD548 (μCOM-42) - NEC
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NEC μCOM-42
no photo (ic).svg
Manufacturer NEC
Model Number μCOM-42
Part Number μPD548
Introduction 1977 (launch)
General information
Family μCOM-42
Clock 100 kHz-200 kHz
Microarchitecture
Microarchitecture μCOM-42
Technology pMOS
Word size 4 bit
0.5 octets
1 nibbles
Electrical
Op. Temp -10 °C – 70 °C
Supply VDD -10 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 2.4 kB
0.0024 MB
2,400 B
19,200 b
2.4e-6 GB
(1920x10 bit)
Stack 4 levels
Pins
Pins 42
IRQ lines 2
I/O ports 1
Input ports 1
Output ports 12
Packaging
Package DIP42 (DIP)

The μPD548 or μCOM-42 is a 4-bit microcontroller introduced in 1977 by NEC. This was the first model of the μCOM-42 family. This microcontroler was designed specifically for electronic cash registers, point of sales, and electronic scales.

The μPD548 is designed to control 8-digit display, ECR printers, and 8x4 matrix keyboard.

Design[edit]

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Instruction Set[edit]

Main article: μCOM-42 ISA
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Documents[edit]

See also[edit]


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familyμCOM-42 +
first launched1977 +
full page namenec/μcom-42/μpd548 +
instance ofmicrocontroller +
manufacturerNEC +
max operating temperature70 °C +
microarchitectureμCOM-42 +
min operating temperature-10 °C +
model numberμCOM-42 +
nameNEC μCOM-42 +
packageDIP42 +
part numberμPD548 +
pin count42 +
ram4.8e-5 MB (0.048 kB, 48 B, 384 b, 4.8e-8 GB) +
ram breakdown96x4 bit +
rom0.0024 MB (2.4 kB, 2,400 B, 19,200 b, 2.4e-6 GB) +
rom breakdown1920x10 bit +
technologypMOS +
word size4 bit (0.5 octets, 1 nibbles) +