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μCOM-42 - NEC
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Developer NEC
Manufacturer NEC
Type Microcontrollers
Production February, 1977
Architecture 4-bit word, 10-bit instructions
ISA μCOM-42
Word size 4-bit
"-bit" is not declared as a valid unit of measurement for this property.
Technology pMOS
Clock 100 kHz-200 kHz
Package DIP42

The μCOM-42 was family of 4-bit microcontrollers, part of the μCOM-4 extended family, specifically marketed for electronic cash registers (ECRs), Point of Sale (POS), and electronic scale applications. These chips were specifically designed for controlling 8x4 keyboards, 8-digit displays, and various ECR-type printers. The μCOM-42 had a separate, modified instruction set, compared with the rest of the μCOM-4 families.

Microprocessors

Design

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μCOM-42 Instruction Set

Main article: μCOM-42 ISA

The μCOM-42 ISA had a set of 72 instructions. Every instruction is a single 10-bit word

See Also


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