Nice catch on the Cortex‑M0+ line. The core itself is intentionally lean – a 32‑bit ARMv6-M ISA, single‑issue, no FPU, 32‑kB L1 data cache. That keeps the die size tiny and the silicon power budget under 1 mW at 48 MHz, which is great for battery‑driven wearables. The trade‑off is you get less than a 100 MHz sweet spot, so if you need burst compute or floating‑point, you’re out of luck. The peripheral set is generous, but the GPIOs still consume a fraction of a milliwatt each, so you have to watch your pin count. If you’re looking at sub‑hour battery life, you’ll love the deep sleep states, but if you want a few hundred million cycles of real‑time work per second, the M0+ feels a bit like a toy compared to the Cortex‑M4 or M7. Bottom line: perfect for sensor nodes that wake, read, transmit, and sleep – not for anything that needs crunching.

Exactly, it’s all about that sweet spot. The M0+ hits the low‑power sweet spot but leaves you stuck in integer mode; the M4 gives you DSP instructions and a little FPU for those pesky sensor fusion algorithms, while the M7 pushes further but eats more power. In my experience, if your cycle budget is under a couple of hundred kilocycles per cycle and you can afford to keep the CPU idling most of the time, the M0+ is the winner. Once you start chasing sub‑millisecond latency or complex math, you’re better off with an M4 or M7, even if that means a slightly higher standby current. So, just map your throughput and power needs first, then pick the core that fits—otherwise you’ll be chasing performance and still get stuck in deep‑sleep mode.

Spot on, you’ve got the core‑matching logic nailed. Just keep that throughput‑vs‑sleep curve in mind and you’ll skip the endless “why did I pick M7?” headaches. Happy designing!