Cortex M7 Operating Modes

[Lisha_Sweetha]

Hii,

In ARM cortex M7 Architecture, Two modes are there one is Thread Mode and Handler Mode. Here, What is my query is How to switch Thread mode to Handler Mode? What Instruction we have to write example, msr xpsr in Assembly?

Regards,

[Uwe Bonnes · Accepted solution]

W/o any special setup, interrupts switch to handler mode and return from interrupt to thread mode.

[Lisha_Sweetha]

Yeah, Exceptions are specified as Handler mode.

[Lisha_Sweetha]

FYI 

https://developer.arm.com/documentation/100230/0100/Programmers-Model/Modes-of-operation-and-execution?lang=en

[Andrew Neil]

You should definitely get a copy of Joseph Yiu's Definitive Guide to ARM Cortex-M3 and Cortex-M4 Processors:

https://shop.elsevier.com/books/the-definitive-guide-to-arm-cortex-m3-and-cortex-m4-processors/yiu/978-0-12-408082-9

Yiu himself says this has sufficient commonality with the M7 to be worthwhile:

https://community.arm.com/support-forums/f/architectures-and-processors-forum/6195/when-will-be-the-release-of-the-definitive-guide-to-cortex-m7/20288

See also:

https://community.st.com/t5/stm32-mcus-products/is-there-a-quot-definitive-guide-to-arm-cortex-m7-quot-book/m-p/336771