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Memory protection unit

Hello.

I'm reading the nrf51 Reference Manual. in MPU section, [ (SWD) will no longer have access to code region 0 or code region 1, as well as no longer being able to access RAM or any peripherals except for the NVMC.]

I wonder why can not access the memory areas are SWD. I want to know why need this functionality.

I hope you'll teach this point.

regards.

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