Microcontrollers
The following is a rough guide, the reality is considerably more complicated.
| Class | Manufacturer | Architecture | Clock | Wikipedia | Notes |
|---|---|---|---|---|---|
| AVR | Microchip (was Atmel) | 8-bit AVR | 1.6 to 32 MHz | AVR microcontrollers | ATmega328, ATtiny |
| PIC | Microchip | 8-bit to 32-bit PIC | 0 to 200 MHz | PIC microcontrollers | |
| STM32 | ST Micro | 32-bit ARM Cortex-M0+ | 0 to 48 MHz | STM32 | |
| SAM | Microchip (was Atmel) | 32-bit ARM Cortex-M0+ | 0 to 48 MHz | Atmel ARM-based processors | e.g. ATSAMD21G18 |
| RP2040 | Raspberry Pi | 32-bit ARM Cortex-M0+ | 0 to 48 MHz | RP2040 | |
| ESP32 | Espressif Systems | 32-bit Xtensa LX6 / RISC-V | 160 or 240 MHz | ESP32 | replaces ESP8266; integrated Wi-Fi and dual-mode Bluetooth |
| MSP430 | Texas Instruments | 16-bit MSP430 | 0 to 25 MHz | TI MSP430 | TI range |