# MCU

CEFR C1 · Noun

Source: https://englishreference.com/word/mcu
Updated: 2026-05-18

## Definition

Stands for Microcontroller Unit. A small computer chip that controls the functions of a device, like a car or a smart toy. It handles tasks like turning lights on and off or reading data from a sensor.

For teachers: Abbreviation for Microcontroller Unit. A compact integrated circuit designed to govern a specific operation in an embedded system, typically containing a processor, memory, and input/output peripherals.

## Examples

- The MCU manages the temperature of the oven.
- Engineers selected a low-power MCU to ensure the drone could fly for several hours without recharging.
- Modern automotive systems rely on a network of MCUs to coordinate everything from engine ignition to advanced driver-assistance features, ensuring real-time processing of complex sensor data.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.