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Chapter 5

Microcontroller basics

3 min read6 sections
In this chapter · 6 sections
  1. Microcontroller vs microprocessor
  2. What is inside an MCU
  3. 8-bit vs 32-bit
  4. How firmware runs
  5. Pin current limits
  6. Reading a datasheet

A microcontroller (MCU) is a complete small computer on one chip: processor, memory and input/output pins.

A microcontroller (MCU) is a complete small computer on one chip: processor, memory and input/output pins. It runs one program, starts in milliseconds, and uses very little power, which makes it the heart of most IoT devices.

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