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For the full article...What it doesn’t have is any flash memory. This was, obviously, a deliberate decision on the part of NXP’s design team, and I got the sense that the company is a bit defensive about it. Certainly, most other MCUs have on-chip flash. Indeed, the Semiconductor Industry Association (SIA) treats on-chip flash as the very definition of a microcontroller; without it you’re a CPU, not an MCU. Great quantities of on-chip flash have become de rigueur for microcontrollers for many years. Why leave it off?
Cost and speed, to name two reasons. Flash manufacturing processes are a little different from pure-logic processes, so you wind up compromising processor speed and/or flash capacity when you mix the two. Flash-capable fab processes also cost more. A pure-logic process (in this case, its 40nm LP process) is well amortized, reliable, and cheap. That’s how you get a Cortex-M7 to run at 600 MHz. The company is already hinting strongly that 1-GHz versions aren’t far behind, once it jumps to the 28-nm node.