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Does ACL protect from CPU only or also peripherals on nRF52850?

Does the ACL peripheral protect flash from Read/Write/Erase of CPU and all peripherals? or just CPU? or do some peripherals have a privileged access? (such as the CryptoCell)

I'd like to use the CryptoCell 310 and keep keys protected from read in the main application code. The CC310 seems pretty capable except that it doesn't have secure key storage. So I'm trying to find a way to store keys protected by ACL, but accessible to the cryptocell.

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