What are some good resources for learning ARM architecture?

 

What are some good resources for learning ARM architecture?

What is your interest and reason for wanting to learn ARM architecture?
As a user there is no great advantage in knowing about the architecture of the underlying processor, except for the fundamentals.
For example, most Arduino users care little that the engine of the Arduino platform is an Atmel ATmega328 MCU.

More importantly, one would be more interested in the performance, capabilities, and available development kits and programming environments.

 

What are some good resources for learning ARM architecture?

Everything is in there, everything.

 

What are some good resources for learning ARM architecture?

Have you used AtMega before? Cortex M0 is almost the same, except that it's 32 bit. Cortex M3/M4 gets you a few extra instructions.
but that's not the hard part. . .
Most manufacturers' Cortex devices come with some very complex peripherals. Learning how to use the peripherals is much more difficult than learning the assembly language.