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What is the difference between IPSR and NVIC_ICSR of Cortex-M?

Yasuhiko Koumoto

Hello experts,

suddenly I have a question.

I cannot understand the functionality between IPSR and NVIC_ICSR[VECTACTIVE].

Are there any difference?

Of course, I know IPSR can be accessed by MSR/MRS of the privileged instructions.

Thank you and best regards,

Yasuhiko Koumoto.

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  • 0 Arm Employee Badge

    IPSR need to be pushed into stack during exeption seqences, so it also became a special register (as part of the PSR).

    Debugger cannot read special registers unless the processor is stopped. So having ICSR[VECTACTIVE] is useful too.

    As a result we have the same information in two places.

    regards,

    Joseph

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  • 0 Arm Employee Badge

    IPSR need to be pushed into stack during exeption seqences, so it also became a special register (as part of the PSR).

    Debugger cannot read special registers unless the processor is stopped. So having ICSR[VECTACTIVE] is useful too.

    As a result we have the same information in two places.

    regards,

    Joseph

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