NEC μCOM-42
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

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Instruction Set

Main article: μCOM-42 ISA

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Documents

• NEC μPD548 datasheet

See also

• μCOM-42
• μCOM-4
• μCOM-8

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