5 ms·

How common are these Memory Protection Units (MPU) in microcontrollers today?

• the__alchemist 2y ago
  There are certain lines that include security features designed for IoT. Becoming more popular. Arm Cortex-m33 etc. so, stm32 L5, U5, nRF-53 etc. Lots of options if you want this. But most MCUs don't have them.
  • bajsejohannes 2y ago
    There's also MPU in even simpler/cheaper MCUs. For instance, ARM Cortex M0+ sports an MPU, and this architecture is used in STM32C0 ($0.24 in bulk) and RP2040. I have no idea how the landscape looks in general, though.
    • comradelion 2y ago
      The vast majority of modern MCUs have enough memory protection for Tock. Anything cortex-m0+ or "better" has an MPU. RISC-Vs PMP or ePMP as well. Most 16-bit "legacy" (though still popular) MCUs don't. Virtually anything with a radio these days (the MSPs were holdouts but mostly those are Cortex-M these days as well)
• ctz 2y ago
  It's technically optional on Cortex-M0+ and above, but in practice everyone includes one.
• ladyanita22 2y ago
  Is it mandatory?