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Cortex-M3: What happen to the stack pointer (sp) when setting VTOR?

J K

The first entry of the vector-table is the initial value for the stack-pointer.

I'm asking me, will the stack-pointer be changed when VTOR was set?

Thanks for any help! :-)

Parents
  • 0 in reply to Yasuhiko Koumoto

    Hello,

    thanks for the answer, but I'm not sure if that was the thing what I want to know.

    Of course, after a reset of the CPU, the VTOR has it's default-value. With this, the stack pointer will be set also the the first value of the vector table (automatically).

    My question was: My app runs and after a while it sets the VTOR to another value than the initial value. The reason was the definiton of other interrupt-handlers.

    But what happened with the stack pointer? Will the SP be set (to the first entry of the NEW vector table) also (automatically)?

    If I understood you right, the SP will be set anyway (by resetting the CPU and when relocating the vectortable by setting VTOR by the application).

    Do I understand it correct?

    Thanks,

    jk

Reply
  • 0 in reply to Yasuhiko Koumoto

    Hello,

    thanks for the answer, but I'm not sure if that was the thing what I want to know.

    Of course, after a reset of the CPU, the VTOR has it's default-value. With this, the stack pointer will be set also the the first value of the vector table (automatically).

    My question was: My app runs and after a while it sets the VTOR to another value than the initial value. The reason was the definiton of other interrupt-handlers.

    But what happened with the stack pointer? Will the SP be set (to the first entry of the NEW vector table) also (automatically)?

    If I understood you right, the SP will be set anyway (by resetting the CPU and when relocating the vectortable by setting VTOR by the application).

    Do I understand it correct?

    Thanks,

    jk

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