As others have mentioned, the peripherals/etc related to a specific model of microcontroller and how you work with them play a big factor. But I'd also like to

As others have mentioned, the peripherals/etc related to a specific model of microcontroller and how you work with them play a big factor. But I'd also like to throw in: - 16 years or so ago, the US side of the Auto industry was trying to steer towards PPC. Motorola/Freescale's presence in the market probably had a bit of a play in this, as well as ARM's then-status of 'not quite powerful enough to be future proof.' A StackOverflow post from 2012 [0] seems to indicate they did indeed standardize, whether they moved on from there is another question. - Most Carmakers probably -don't- want to change designs outside of a refresh. There's a few reasons for this, including both external (updating documentation to repair network) and internal (when I worked at a place that did software/services for a US automaker, we had to submit pages of documentation/paperwork to change a couple of items placement/wording in a dialogue box.) [0] - https://electronics.stackexchange.com/questions/26035/whats-so-great-about-ppc-theres-gotta-be-something https://electronics.stackexchange.com/questions/26035/whats-...